Answers
Explanation:
\(V = IR \Rightarrow R = \dfrac{V}{I}\)
Plugging in the numbers, we get
\(R=\dfrac{4.5\:\text{V}}{0.5\:\text{A}} = 9.0\) ohms
Related Questions
In hiking, what fitness component is required of you
Answers
Explain what happens with the 0.25 days each year
Answers
Answer:
leap year
Explanation:
Which car has the greater acceleration magnitude: car A that accelerates from 0 to 10 m/s in 50 m or car B that accelerates from 10 m/s to 20 m/s in 50 m
Answers
The car that has the greater acceleration magnitude is car B
Torricelli's theorem can be used to calculate the magnitude of an object's acceleration when the value of time is not known:
\(v^{2} = v_{0}^{2} + 2a\Delta S\)
Note that \(v\\\) is the final velocity value, \(v_{0}\) is the initial velocity value, \(a\) is the acceleration value, and \(\Delta S\) is the displacement.
Substituting the values given by the question in the formula, we have:
CAR A\(10^{2}= 0^{2}+2\times a \times 50\)
\(100 = 100a\)
\(a = 1m/s^{2}\)
2. CAR B
\(20^{2} = 10^{2} + 2\times a \times 50\)
\(400 = 100 + 100a\)
\(100a=300\)
\(a = 3m/s^{2}\)
So, comparing the two acceleration calculated above, it is assumed that the car has the greater acceleration magnitude is car B with \(3m/s^{2}\) comparing to \(1m/s^{2}\) of the car A.
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A spherical volume contains a uniformly distributed charge density of 2×10 −4
Cm −3
. The electric field at a distance of 4 cm from the centre is :
Answers
At a distance of 4 cm from the sphere's centre, the electric field is 9.3 104 NC1.
What is an electric field?An electric field is a physical phenomenon created by electric charges that add additional force and other charges by removing or attracting them electrically. The electric field is a vector field, which means it is both electric and directed. Electric fields are utilised in a range of applications, from our generation to medicinal treatment, and their strength is expressed in moles per metre.
Gauss's Law, which states that the electric flux is equal to the charge encompassed by the surface, is used to determine the electric field at a distance of 4 cm from the centre. The electric field is the same at every location on the surface because the charge is distributed uniformly.
We may determine the electric field at the sphere's surface using Gauss's Law:
E = (4πr2ρ)/(3ε0)
Where,
r = 4 cm
ρ = 2×10−4 Cm−3
ε0 = 8.85×10−12 C2N−1m−2
Substituting the values in the formula,
E = (4π(4×10−2)2×2×10−4)/(3×8.85×10−12)
E = 9.3 × 104 NC−1
As a result, the electric field is 9.3 104 NC1 at a distance of 4 cm from the sphere's centre.
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Hi
Please help on question asap if the answer is correct I'll rate you five stars a thanks and maybe even brainliest!
When two light bulbs are connected in series, the resistance in the circuit is increase compared to that with one lightbulb. The increased resistance opposes the flow of current so far fewer electrons pass per second , transferring less energy. The lightbulbs are therefore not as bright as In a circuit with same voltage but only one bulb.
However, when Two lightbulbs are connected in parallel, each loop behaves like a separate circuit . The resistance in each branch is the same as if there were just one light bulb in the whole circuit.there is the same current in each branch of the circuit ,so the bulbs Will light up with the same brightness as a single bulb circuit. The energy stored in the battery will decrease twice as quickly and battery will run out faster than I series circuit.
6) explain the advantages and disadvantages of arranging components in series or parallel.
Answers
Advantages of Components Arranged in Series:
1. Increased resistance: Connecting components in series increases the overall resistance in the circuit. This can be advantageous in situations where you want to limit the flow of current or control the amount of power being dissipated.
2. Voltage sharing: In a series circuit, the total voltage of the power supply is divided among the components. This can be useful when you want to ensure that each component receives a specific voltage.
3. Current consistency: The current remains the same throughout the series circuit, which can be beneficial when you need to ensure a consistent current flow through multiple components.
Disadvantages of Components Arranged in Series:
1. Reduced brightness or performance: As mentioned in the question, when light bulbs are connected in series, the increased resistance reduces the flow of current, resulting in dimmer bulbs or reduced performance in other electrical devices.
2. Single point of failure: If one component in a series circuit fails, it can disrupt the entire circuit and cause all components to stop functioning.
Advantages of Components Arranged in Parallel:
1. Brightness and performance: When components such as light bulbs are connected in parallel, each component receives the full voltage, resulting in brighter bulbs and better performance in other devices.
2. Redundancy: In a parallel circuit, if one component fails, the other components can continue to function independently. This provides redundancy and ensures that the failure of one component does not affect the others.
3. Increased current capacity: Parallel arrangement allows the circuit to handle higher currents, which can be useful in situations where high power or heavy loads are required.
Disadvantages of Components Arranged in Parallel:
1. Increased complexity: Parallel circuits require more wiring and connections, which can make the circuit more complex and harder to manage.
2. Higher cost: Parallel circuits may require more components and wiring, resulting in higher costs for materials and installation.
It's important to consider the specific requirements and constraints of the application when deciding whether to arrange components in series or parallel. Each configuration has its advantages and disadvantages, and the choice depends on factors such as desired current flow, voltage distribution, and reliability.I
During a football match, the ball kicked at 45° angle of elevation went just over the goal post, height 2.4m. Assuming the goal post height is the greatest, calculate: (a) The speed at which the ball was projected (b) The time taken to reach the greatest height (c) The horizontal distance between the point of kick and foot of the goal post (neglect the thickness of the bar).
Answers
Answer:
We can use the kinematic equations to solve this problem. Here are the steps:
(a) To find the initial velocity of the ball:
Let v be the initial velocity of the ball, and g be the acceleration due to gravity (-9.81 m/s^2).
The horizontal component of the velocity will remain constant throughout the motion, so we can write:
vx = v cos(45°)
where vx is the horizontal component of the velocity.
At the highest point, the vertical velocity of the ball will be zero, so we can use the equation:
vy^2 = u^2 + 2gh
where u is the initial vertical velocity, and h is the maximum height. We know that u = v sin(45°), so we can write:
(v sin(45°))^2 = v^2 + 2gh
Substituting the given values, we get:
(v^2)/2 = 2.4 m
v = √(4.8g) ≈ 9.25 m/s
Therefore, the initial speed of the ball was approximately 9.25 m/s.
(b) To find the time taken to reach the greatest height:
We can use the kinematic equation:
v = u + gt
At the highest point, the vertical velocity of the ball is zero, so we can write:
0 = (v sin(45°)) + gt
Solving for t, we get:
t = (v sin(45°)) / g
Substituting the value of v, we get:
t = (9.25 m/s) / (sqrt(2) * 9.81 m/s^2) ≈ 0.66 s
Therefore, the time taken to reach the greatest height was approximately 0.66 seconds.
(c) To find the horizontal distance between the point of kick and the foot of the goal post:
We can use the kinematic equation:
d = vxt
where d is the horizontal distance, and t is the time taken to reach the foot of the goal post. We already know the time t from part (b), so we just need to calculate the horizontal velocity:
vx = v cos(45°) ≈ 6.54 m/s
Substituting the values, we get:
d = (6.54 m/s) x (0.66 s) ≈ 4.32 m
Therefore, the horizontal distance between the point of kick and the foot of the goal post was approximately 4.32 meters.
2
Look at the circult dlagram.
Direction
of current
Battery
Bulb-
What type of circuit is shown?
A. open series circult
B. closed series circuit
C. open parallel circult
D. closed parallel circult
Answers
The direction of the current from the positive to the negative battery terminals and the fact that the bulbs are connected in parallel to each other suggests that this circuit is a Closed Parallel Circuit. The correct option is D.
What is the difference between open and closed circuits?An open circuit and a closed circuit are two types of electrical circuits that describe the flow of electrical current through a circuit.
An open circuit is a circuit in which there is a break in the path of the current, meaning that the current cannot flow through the circuit. In an open circuit, the switch is in the "off" position or there is a broken wire, and so no electrical current can flow through the circuit. This means that there is no voltage or electrical energy being transferred from the source to the load.
On the other hand, a closed circuit is a circuit in which there is a complete path for the current to flow through, meaning that the current can flow through the circuit. In a closed circuit, the switch is in the "on" position, and there is a continuous path for the current to flow from the source to the load and back to the source. This means that there is voltage and electrical energy being transferred from the source to the load.
Here in this question,
The direction of the current from the positive to the negative battery and the fact that the bulbs are connected in parallel to each other suggests that this circuit is a Closed Parallel Circuit.
In a closed parallel circuit, the components are connected in parallel to each other, meaning that they are connected to the same two points in the circuit and the current has multiple paths to flow through. The voltage across each component is the same, and the total current flowing through the circuit is divided among the components according to their resistance.
In contrast, an open series circuit is a circuit in which the components are connected in series, meaning that they are connected end to end in a single path, with no other branch points for the current to follow. If one component fails, the circuit becomes open and the current stops flowing.
Therefore, based on the information provided, the circuit described in the question is a Closed Parallel Circuit.
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Activity. 11. Energy Level Transitions. The following labelled transitions represent an electron moving between energy levels in hydrogen. ionization free electrons 13.6 eV level 4 level 3 12.8 eV 12.1 eV level 2 E 102 eV А B с D level 1 00 eV Answer each of the following questions and explain your answers. a. Which transition could represent an atom that absorbs a photon with 10.2 eV of energy? b. Which transition could represent an atom that emits a photon with 10.2 eV of energy? C. Which transition represents an electron that is breaking free of the atom? d. Which transition, as shown, is not possible? e. Would transition A represent emission or absorption of light? How would the wavelength of the emitted absorbed photon of transition A compare to that of the photon involved in transition C? f. or
Answers
Transition B. Absorption of a photon is indicated by the upward pointing arrow. The photon transitions from level 1 to level 2.
What is the explanation?a)Transition B. Absorption of a photon is indicated by the upward pointing arrow. The photon transitions from level 1 to level 2.b)Transition C. In opposition to Part A, a downward pointing arrow shows that a photon is being emitted. This photon is going from level 2 to level 1.c)Transition E. This photon has gained enough energy to escape the atom.d)Transition D is not possible. Going from level to level requires "exact change". Because this photon did not gain either 10.2 eV, 12.1 eV, 12.8 eV, or 13.6 eV, it cannot exceed to any level. Therefore, it falls back down to level 1.To learn more about photon refer to:
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On a brisk walk, a person burns about 331 Cal/h. If the brisk walk were done at 3.0 mi/h, how far would a person have to walk
to burn off 1 lb of body fat? (A pound of body fat stores an amount of chemical energy equivalent to 3,500 Cal.)
mi?
Answers
Answer:
32mi
Explanation:
If 1lb contains 3,500 Cal
It means the number of hours required to burn 3500cal would be;
3500/331 = 10.57hours
But a brisk walk is 3.0 mi/h,
It means a distance of 3.0 × 10.57 mi would be covered = 31.71 miles
32miles{ approximated to the nearest whole}
Note Distance = speed × time
true or false solubility can be used to identify an unknown substance
Answers
True
A car travels from Miami to Orlando, 200 miles, in 3.5hours. Then, Orlando to Tampa, 60 miles, in 1.25 hours.Calculate:a) the average speed for each part of the tripb) the average speed for the entire trip
Answers
Answers:
a) Miami to Orlando: 57.14 mph
Orlando to Tampa: 48 mph
b) Entire trip: 54.74 mph
Explanation:
The average speed can be calculated as the total distance traveled divided by the total time. So, the average speed of each part of the trip is
Miami to Orlando
Avg speed = 200 miles/3.5 h = 57.14 mph
Orlando to Tampa
Avg speed = 60 miles/1.25 h = 48 mph
Then, the average speed of the entire trip is
Avg speed = (200 mi + 60 mi)/(3.5 h + 1.25 h)
Avg speed = 54.74 mph
If you drop a rock off a cliff and it hits the ground 3 seconds later how tall is that cliff
Answers
Answer:
Basic kinematics, negating drag and assuming ideal conditions, we use the equation:
d=vi*t+1/2*a*t^2
Since vi is 0 (we know this because you’re dropping it, not throwing it)…
…and the only acceleration acting on it is gravity, a=9.8 m/s^2…
…we get
d=1/2(9.8)(5)^2
Explanation:
Some quick mental math tells us that this is about 125 m.
Plugging it in, we find it to be 122.5 m.
The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 38N⋅m38N⋅m. You plan to tighten the plugs by pulling on the end of a 25-cm-long wrench. Because of the cramped space under the hood, you'll need to put at an angle of 120∘with respect to the wrench shaft. With what force must you pull?
Answers
Answer:
F= 175.5N
Explanation:
Given:
Torque which can also be called moment is defined as rotational equivalent of linear force. It is the product of the external force and perpendicular distance
torque of 38N⋅m
angle of 120∘
Torque(τ): 38Nm
position r relative to its axis of rotation: 25cm , if we convert to metre for consistency we have 0.25m
Angle: 120°
To find the Force, the torque equation will be required which is expressed below
τ = Frsinθ
We need to solve for F, if we rearrange the equation, we have the expression below
F= τ/rsinθ
Note: the torque is maximum when the angle is 90 degrees
But θ= 180-120=60
F= 38/0.25( sin(60) )
F= 175.5N
How do magnets work and what effect do they have on their surroundings?
Answers
Answer:
Explanation: Magnets can be used in space. ... Magnets don't need gravity or air. Instead, their power comes from the electromagnetic field they generate all by themselves. One class of magnets, called electromagnets, does need electricity to work.
Answer:
magnets work due to a magnetic field and attract or repel an electrically charged or magnetic objects
Explanation:
its magnetism works due to alignment of atoms in a magnetic object
Solve for the mass of a planet with an orbital radius of 4 AU and an orbital period of 4 Earth years,
orbiting a star whose mass is 3 solar masses.
Answers
The mass of the planet orbiting through the path can be calculated using its period of orbit, and radius . Here, the mass of the planet be 7.11 × 10³⁰ kg.
What is orbital period ?The orbital period of a spatial object is the time taken to revolve around a star or another spatial object through out an elliptical orbit.
The mass of the star can be calculated using the formula :
m = 4 π r³/G T²
given,
r = 4 Au = 4 × 1.5 × 10¹¹ m
T = 4 years = 12.6 × 10⁷ seconds.
G = gravitational constant 6.67 × 10⁻¹¹ m³/kg s²
Then M = 4 × 3.14 × (4 × 1.5 × 10¹¹ m)³/ 6.67 × 10⁻¹¹ m³/kg s² × ( 12.6 × 10⁷ s)²
= 7.11 × 10³⁰ kg.
Therefore, the mass of the planet is 7.11 × 10³⁰ kg..
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A block of wood 3 cm on each
side has a mass of 27 g. What is the
density of the block? (Hint, don't
forget to find the volume of the
wood first using lx W h.)
Answers
Answer:
1g/cm3
Explanation:
volume of block is 3 cubed which is 27 cm3
we know density is m/v so d= 27g/27cm3
which is 1g/cm3
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A child that weighs 800 N swings on a swingset. When the child is at the lowest point in the arc, the total tension in the swing chains is 1040 N. What is the child's centripetal acceleration?[Use g = 10 m/s2]
Answers
Given that the downward weight, mg = 800 N and tension in the swing is, T = 1040 N.
Also centripetal force,
\(\begin{gathered} F=T-mg \\ =1040-800 \\ =240\text{ N} \end{gathered}\)Mass of the swing can be obtained using the weight
\(\begin{gathered} mg=800 \\ m=80\text{ kg} \end{gathered}\)Here, g = 10 m/s^2 is the acceleration due to gravity.
Centripetal force can also be written as
\(F=ma\)Here, a is the Centripetal acceleration.
Thus, centripetal acceleration is
\(\begin{gathered} a=\frac{F}{m} \\ =\frac{240}{80} \\ =3m/s^2 \end{gathered}\)Hence the child's centripetal acceleration is 3 m/s^2
Calculate the displacement in meters of a motorcycle that has a speed of 100 kilometers per hour if it has circulated for 50 minutes
Answers
Hello..!
To calculate its displacement, we first apply the data to the problem.
Data:
V = 100km/hT = 50minD = ?Now, we apply a conversion.
Conversion:
100km/h • (1000m/1km) • (1h/3600s) V = 27.7m/s50min • (60s / 1min) T = 3000sThen, we apply the formula that is.
Formula:
D = V • TFinally we develop the problem.
Developing:
D = (27.7m/s) • (3000s)D = 83100mThe displacement of the bike is 83100 meters.
Answer:
83,333.33 m (2 d.p.)
Explanation:
\(\boxed{\sf Speed=\dfrac{Distance}{Time}}\)
Given values:
Speed = 100 k/hTime = 50 minutesAs there are 60 minutes in one hour, convert minutes into hours by dividing by 60:
\(\implies \sf Time=\dfrac{50}{60}=\dfrac{5}{6}\;hour\)
Substitute the values into the formula and solve for distance:
\(\implies \sf 100=\dfrac{Distance}{\frac{5}{6}}\)
\(\implies \sf 100=Distance \times \dfrac{6}{5}\)
\(\implies \sf Distance=\dfrac{100 \times 5}{6}\)
\(\implies \sf Distance=\dfrac{250}{3}\;km\)
\(\implies \sf Distance=83.33333...\;km\)
At there are 1000 meters in one kilometer, convert kilometers into meters by multiplying by 1000:
\(\implies \sf Distance=83.33333...\times 1000=83333.33\;m\;(2\;d.p.)\)
Please Help ~ 50 Points!
A bunjee jumper steps off a bridge and experiences 2.34 seconds of free fall. How far has the jumper fallen? How fast is the jumper going after 2.34 seconds?
The jumper has fallen __________ .
The jumper has a speed of __________ after 2.34 seconds.
Answers
Answer:
height=.5*gravity*(time)^2
height=0.5*9.81*(2.34)^2
height= 26.85m
------
velocity= gravity*time
velocity = 9.81 * 2.34
velocity= 22.95 m/s
\(\\ \sf\longmapsto h=-\dfrac{1}{2}gt^2\)
\(\\ \sf\longmapsto h=-5(2.34)^2\)
\(\\ \sf\longmapsto h=-5(5.47)\)
\(\\ \sf\longmapsto h=27.35m\)
And
\(\\ \sf\longmapsto v^2=u^2+2gs\)
\(\\ \sf\longmapsto v^2=(2.34)^2+2(10)(27.35)\)
\(\\ \sf\longmapsto v^2=5.47+547\)
\(\\ \sf\longmapsto v^2=552.47\)
\(\\ \sf\longmapsto v\approx 23.5m/s\)
Each box contains information from two different ecosystems about a similar pattern of
interaction between two species that live in close association with each other.
Categorize the type of symbiotic relationships described in the boxed information.
Answers
Answer:
What is the interaction between two different species in an ecosystem called?
Interactions between different species in a community are called interspecific interactions—inter- means "between." Different types of interspecific interactions have different effects on the two participants, which may be positive (+), negative (-), or neutral (0).
Explanation:
An airplane flew from San Francisco to Washington, D.C. Approximately
halfway through the flight, the plane had traveled 2,000 km in 2.5 hours.
What was the speed during this period?
Another airplane is flying in the opposite direction. It covers the same distance in exactly 2 hours. What was its speed and direction during this period?
Answers
Answer:
The solution is given below:
Explanation:
The computation of the speed is shown below
As we know that
Speed = distance ÷ time
where
distance is 2000 km
And, the time is 2.5 hours
SO, the speed is
= 2,000 ÷ 2.5
= 800 km/h
Now the distance would be the same i.e. 2,000 km
but the time is 2 hours
So, the speed is
= 2,000 km ÷ 2 hours
= 1,000 km/hr
The direction should be opposite to the first airplane
Energy stored in food can be considered as a type of what kind of energy
Answers
Answer: We get chemical energy from foods, which we use to run about, and move and talk kinetic and sound energy Chemical energies are stored in fuels which we burn to release thermal energy - this is one way of making electricity, see Electricity for more information
hope this helps
A projectile is fired horizontally with a velocity of 48 m/s from the hill 294 m high. Find the time taken to reach the ground.
A. 7.75 s
B. 10.0 s
C. 60.5 s
D. 15.2 s
Answers
d=294m
Vi= 0m/s
Vf=?
a=10m/s^ (use 9.81 in substitution for regents physics)
t=?
First let’s solve for Vf using Vf^2=Vi^2+2(a)(d)
Vf^2= (0m/s) + 2(10m/s^2)(294m)
[RAD]Vf^2= [RAD]5880m/s
Vf=76.7m/s
Now we can solve for time using d=Vi(t)+1/2(a)(t)^2
294m=(0m/s)+1/2(10m/s^2)(t)^2
(294m)/5=((5m/s)(t)^2)/5
[RAD]t^2= [RAD]58.8sec
t=7.66 sec
*when using 9.81m/s^2 as (a) value, the answer is 7.75 sec
in a isovolumetric process the is constant.
Answers
Answer:
An isothermal process is a change of a system, in which the temperature remains constant: ΔT = 0.
Explanation:
:)
Which ideas did you include in your answer? Check all that apply.
Scientists use relative and absolute dating to determine age of rocks.
Scientists can organize the rocks layers based on their age on the geologic time scale.
The type of rocks and the fossils in the rock layers tell scientists about Earth’s history.
Answers
By contrasting a fossil with related rocks and fossils of known ages, relative dating can estimate the fossil's age.
By utilising radiometric dating to track the isotope decay inside the fossil or, more frequently, the rocks it is linked with, absolute dating may pinpoint an object's exact age.
What are the benefits of using relative and absolute dating of rocks?It is possible to identify whether one artefact, fossil, or stratigraphic layer is older than another using relative dating, which does not provide particular dates.
Absolute dating techniques offer more precise dates and times of origin, such as a range in age in years.
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True or False Completely inelastic collisions result in KE losses of only ~10%.
Answers
Completely inelastic collisions:
A perfectly inelastic collision is a collision in which the objects stick together after the collision and move with the same velocity.
The momentum of the system is conserved but the kinetic energy of the system is not conserved in an inelastic collision. This means that there will be some loss of kinetic energy.
How much KE will be lost?
This depends on the system that we are analyzing. There is no hard and fast rule that this amount of KE will be lost.
We cannot say that there will be exactly a 10% loss in KE without knowing the system.
Therefore, the given statement seems to be false.
Electromagnetic waves can carry more data at higher frequencies. Why would a scientist opt to transmit data at a lower frequency instead?
What are the limitations of sending information using electromagnetic waves?
What are the differences between analog and digital signals?
What are the advantages of using digital signals over analog signals?
Using reliable internet sources, identify three ways we use analog and digital signals in our everyday lives.
Describe how radio telescopes are used to explore space.
How are radio waves used on Earth?
Why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (Hint: What did the article say about the advantages of digital signals?)
Answers
2) Limitations of using electromagnetic waves in sending communication
communication is a process of transmitting and receiving information in the form of signals.high technology communication use electromagnetic waves,there are various types of electromagnetic waves which are used in communication which include radio-waves,microwaves,infrared e.t.c some of their limitations are
i)Because there is limited number of broadcast frequencies the use of transmitters must be restricted in some way or they will seriously interfere with each other.
ii)Through the air signals can be distorted by atmospheric conditions and signals from space are sometimes distorted by solar activity
iii)physical activities such as mountains and buildings can prevent or interfere with some transmissions
iv)Through the air signals are not private,so any tuned receiver within the range can pick up them.
3)Differences between digital and analogue signals
Analogue and digital signal are used to transmit information usually through electric signals.
An analogue signal is continuous wave denoted by sine wave and may varry in signal strength (amplitude) or frequency(time) an example is sound from human voice is analogue because waves are continuous..
A digital signal is a signal in which the original information is converted into a string of bits before being transmitted .example a must for computer processing where is described as using (0s and 1s)and therefore can not take any fractional value.
4)Advantages of using digital signals over analogue signals
one advantage of digital signals are inherently less susceptible than analog signals to interference caused by noise because with digital signal it is not necessary to evaluate precise amplitude,frequency or phase.
Another advantage based in capacity is that digital signals carry more information per second than analogue signals.
Digital signals maintain their quality over long distances better than analogue signals.
5)How we use digital and analogue signals in our everyday live
digital signal processing is the way of life of current generation
example is mobile phones do alot of digital signal processing .they process our our speech digitally to remove background noise,echo e.t.c
Television also do a lot of digital processing of video,audio signal to present them in a better way.
How radio telescopes are used to explore space
A radio telescope is a specialized antenna and radio receiver used to receive radio waves from astronomical radio sources in the sky in radio astronomy.It has several main parts, a dish and antenna,a receiver,a detector and an analyzer.The dish collects the radio signals from space ad focuses them on the antenna.
6)How radio waves are used on earth
Radio waves are used to transmit television and radio programs They have longer wave lengths and are reflected by the ionosphere
7) Reasons why telescopes convert radio waves (analog) to electrical(digital) signals for analysis
This is because signals can be easily stored and transmitted in digital form.The analog is continuous in time and it is necessary to convert this to a flow of digital values.
Name:.
Date:
Homework: Writing an Argument About
Australia's Skin Cancer Rate
G
4
You now have enough evidence to explain why Australia's skin cancer rate is so high. Review your
argument from Chapter 2 and think about how you will convince the AHA that both Claim 2 and
Claim 3 are accurate. You will use your completed Reasoning Tool from Activity 3 to revise and add to
your argument.
Question: Why is the skin cancer rate in Australia so high?
Answers
76. Two electric charges -6μC and
+6μC are placed respectively in two
points A and B distant of 1m apart. The
electric field is null at the point C:
A.Located in the middle of the
segment AB
B.Located outside segment AB at
1m from A.
C.Located outside segment AB at
1m from B
D.Outside the line AB
E.No answer is right.
Answers
A. The electric field is null at the point C; located in the middle of the
segment AB.
What is electric field?Electric field is the region of space where the influence of electric force is felt.
Electric field at the middle of ABE = kq/r²
where;
r is the middle of AB = 0.5 mE(+6μC) = (9 x 10⁹ x 6 x 10⁻⁶) / (0.5²)
E(+6μC) = +216,000
E(-6μC) = (9 x 10⁹ x 6 x 10⁻⁶) / (0.5²)
E(-6μC) = -216,000
Sum of the electric field at the middle of ABE(net) = E(+6μC) + E(-6μC)
E(net) = 216,000 - 216,000 = 0
Thus, the electric field is null at the point C; located in the middle of the
segment AB.
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I have a material thats 65 cubic feet totaling 40000 cubic yards. How many dump trucks will it take to haul this material?
Answers
It will take about 2,500 dump trucks to haul the material. Assuming the capacity of the dump truck is 16 cubic yards.
Note: A standard dump truck is between 10 -16 cubic yards.
1 cubic yard = 27 cubic feet.
from the question:
40,000 cubic yards= 65 cubic feet
hence,
Assuming the dump truck capacity is 16 cubic yards
Then,
number of dump trucks = 40,000 cubic yards/16 cubic yards
=2,500
Therefore a dump truck of 16 cubic yards capacity, will need about 2,500 dump trucks to haul the material totaling 40,000 cubic yards.
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