If resistor R3 is replaced with a wire which of the following describes what would happen to the circuit? a) short circuit. b) no change.

The answer to this is B, C, and D. hope this helped

If the total momentum of the insects is zero, this means all of the insects are at rest or are moving in opposite of each other. Same if the total kinetic energy is zero.

Momentum is the quantity of motion which is multiplied by the amount of matter moved i.e., mass and the velocity at which it moves. Because, the object is in motion, it is a vector quantity, it has both direction and magnitude. It is determined by the product of the object's mass and the velocity of object.

If the total momentum of the insects is zero, this could mean anything of the two things. Either, all of the insects are at rest or an equal amount of insects are moving in opposite direction of each other which cancels out the total momentum of the insects.

If the total kinetic energy of the insects is zero, this means either all of the insects are at rest or an equal amount of insects are moving in opposite direction of one another which results into canceling out the energy.

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Answer:

51 miles/hour

Explanation:

Talia is on a road trip with some friends. in the first 2 hours, they travel 100 miles. then they hit traffic and go only 30 miles in the next hour. the last hour of their trip, they drive 75 miles. calculate the average speed of talia’s car during the trip. give your answer to the nearest whole number.

The average speed would be 51 miles/hour.

The average speed of a moving object is defined as the total distance traveled relative to the total time taken fro the journey. Mathematically, it is given as:

  total distance traveled/total time taken.

In this case;

Total distance traveled = 100 + 30 + 75 = 205 miles

Total time taken = 2 + 1 + 1 = 4 hours

Therefore;

Average speed = 205/4 = 51.25 miles/hour

To the nearest whole number = 51 miles/hour

Answer:

balanced: a train moving at a constant speed, the moon orbiting the earth at a constant speed, a lamp sitting on a desk, an apple hanging on a tree

unbalanced: a skier coming down a mountain, a car accelerating from the start line, a soccer ball after it was kicked, a parachuter falling to ground

Explanation:

all the balanced ones are either moving at a constant speed or are skill

all the unbalanced ones were disturbed by some sort of force causing them to accelerate, go faster, blah blah blah

Choice-B is a relevant statement, although we can't see enough of the picture to actually know what's going on.

A good example of this scenario is our own moon.  Because of the Sun's  gravitational influence, the Moon's orbit around the Earth is not a circle or an ellipse.

The components of the vector v are given as:

where v is the magnitude of the vector and theta is the angle.

In this case we have v=253 and theta=55.8°, plugging this values into the y component we have:

Therefore the y component is 209.25 meters.

Answer:

Once you have drawn the free-body diagram, you can use vector addition to find the net force acting on the object. We will consider three cases as we explore this idea:

Case 1: All forces lie on the same line.

If all of the forces lie on the same line (pointing left and right only, or up and down only, for example), determining the net force is as straightforward as adding the magnitudes of the forces in the positive direction, and subtracting off the magnitudes of the forces in the negative direction. (If two forces are equal and opposite, as is the case with the book resting on the table, the net force = 0)

Example: Consider a 1-kg ball falling due to gravity, experiencing an air resistance force of 5 N. There is a downward force on it due to gravity of 1 kg × 9.8 m/s2 = 9.8 N, and an upward force of 5 N. If we use the convention that up is positive, then the net force is 5 N - 9.8 N = -4.8 N, indicating a net force of 4.8 N in the downward direction.

Case 2: All forces lie on perpendicular axes and add to 0 along one axis.

In this case, due to forces adding to 0 in one direction, we only need to focus on the perpendicular direction when determining the net force. (Though knowledge that the forces in the first direction add to 0 can sometimes give us information about the forces in the perpendicular direction, such as when determining frictional forces in terms of the normal force magnitude.)

Example: A 0.25-kg toy car is pushed across the floor with a 3-N force acting to the right. A 2-N force of friction acts to oppose this motion. Note that gravity also acts downward on this car with a force of 0.25 kg × 9.8 m/s2= 2.45 N, and a normal force acts upward, also with 2.45 N. (How do we know this? Because there is no change in motion in the vertical direction as the car is pushed across the floor, hence the net force in the vertical direction must be 0.) This makes everything simplify to the one-dimensional case because the only forces that don’t cancel out are all along one direction. The net force on the car is then 3 N - 2 N = 1 N to the right.

Case 3: All forces are not confined to a line and do not lie on perpendicular axes.

If we know what direction the acceleration will be in, we will choose a coordinate system where that direction lies on the positive x-axis or the positive y-axis. From there, we break each force vector into x- and y-components. Since motion in one direction is constant, the sum of the forces in that direction must be 0. The forces in the other direction are then the only contributors to the net force and this case has reduced to Case 2.

If we do not know what direction the acceleration will be in, we can choose any Cartesian coordinate system, though it is usually most convenient to choose one in which one or more of the forces lie on an axis. Break each force vector into x- and y-components. Determine the net force in the x direction and the net force in the y direction separately. The result gives the x- and y-coordinates of the net force.

Example: A 0.25-kg car rolls without friction down a 30-degree incline due to gravity.

We will use a coordinate system aligned with the ramp as shown. The free-body diagram consists of gravity acting straight down and the normal force acting perpendicular to the surface.

We must break the gravitational force in to x- and y-components, which gives:

F_{gx} = F_g\sin(\theta)\\ F_{gy} = F_g\cos(\theta)F

gx

​

=F

g

​

sin(θ)

F

gy

​

=F

g

​

cos(θ)

Since motion in the y direction is constant, we know that the net force in the y direction must be 0:

F_N - F_{gy} = 0F

N

​

−F

gy

​

=0

(Note: This equation allows us to determine the magnitude of the normal force.)

In the x direction, the only force is Fgx, hence:

F_{net} = F_{gx} = F_g\sin(\theta) = mg\sin(\theta) = 0.25\times9.8\times\sin(30) = 1.23 \text{ N}F

net

​

=F

gx

​

=F

g

​

sin(θ)=mgsin(θ)=0.25×9.8×sin(30)=1.23 N

The event that is possible when you toss a number cube labelled 1 to 6 is getting a number less than 7.  

It is certain that you will get a number less than 7 if you roll a number cube with the numbers 1 through 6. There are six possible outcomes for this scenario (all the numbers from 1 to 6). The likelihood of "receiving less than 7" is therefore 6 / 6 or 1.

Generally speaking, a probability of 0 denotes an event's impossibility while a probability of 1 denotes an event's certainty of occurring.

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The beam can be lifted at a distance of approximately 770.27 meters.

The quantity of energy transmitted when a force is applied across a distance is measured by the physical concept of work. A force must be applied to an object in order for it to move in the direction of the force and perform work. The unit of measurement for work is the joule (J), which has a magnitude but no direction.

To find the distance of the beam can be lifted, use the formula:

Work = force × distance × cos(θ)

Distance = 57000 J ÷ (74 N × cos(θ))

= 770.27 meters

Thus, the capacity of beam 770.27 meter.

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Hi there!

We can begin by calculating the acceleration of the system:

∑F = ma

m = sum of the mass of both blocks

Solve for acceleration:

∑F/m = a

30/(6 + 9) = 2 m/s²

On the 6 kg block, the tension is equivalent to the net force:

∑F = T

Since we know that the 6kg is accelerating at 2 m/s², we can solve for tension:

∑F = T = ma

T = 6 · 2 = 12 N

Answer:

infra-red

molecules

vacuum

ionizing (?)

transmission

redirected

absorbed

emission

dark

emitter

reflectors

deflect

Answer:

Your answer is B co2

Explanation:

Answer: CO2

Explanation:

Carbon dioxide is consisted of one carbon molecule and 2 oxygen molecules, therefore CO2

Answer:

The acceleration is 1 cm/s^2.

Explanation:

The acceleration is defined as the rate of change of velocity.

Here, initial velocity, u = 3/1 = 3 cm/s

final velocity, v = 4/1 = 4 cm/s

time, t = 1 s

Let the acceleration is a.  

Use first equation of motion

v =  u + at

4 = 3 + 1 x a

a = 1 cm/s^2

Answer:

I learned about human body, and cause of global warming.

Explanation:

These topics were so great to learn because I didn't know about Endocrine system, but now I know the job and the importance of  the Endocrine system. Also, I learned about global warming and I never knew what the cause of it was and it was great to learn new things!

Answer:

C. 199.9 s

Explanation:

3 minutes = 3×60 = 180 seconds.

the turtle moves in that time 180×10 = 1800 cm.

in other words the rabbit gave it that much head-start (it does not matter if that was at the begin of in the middle of the race).

the rabbit moves with 10×10cm/s = 100cm/s.

the rabbit needs therefore 1800/100 = 18 seconds for the

1800 cm.

at that time the turtle has added another 18×10 = 180 cm.

for which the rabbit needs 180/100 = 1.8 seconds.

during that time the turtle has added 1.8×10 = 18 cm.

and so on.

in formal mathematics this looks like this :

1800 + 10x = 100x

after x seconds of the rabbit running both will have run the same distance, and it is a tie.

1800 = 90x

x = 20 seconds

so, at that point, the rabbit was actively running for 20 seconds and raced 20×100 = 2000 cm

and the turtle was actively running for 180 + 20 = 200 seconds, and also covered 200×10 = 2000 cm.

but our question tells us that the turtle won by 10 cm.

so, the race was over a little bit before these 200 seconds (for a tie).

this means, the rabbit could not run the last 10 cm for the tie (because the race was over and the turtle had won).

the rabbit would have needed 10/100 seconds for these 10 cm.

as speed = distance/time

we need to divide distance by speed

distance/1 / distance/time

to get time.

so,

10cm/1 / 100cm/s = 10s/100 = 1/10 s

so, we need to deduct this 1/10 s from the 200 seconds of the turtle (and also from the 20 seconds for the rabbit).

the race lasted of course the whole time the turtle was running (while the rabbit was resting, officially still participating in the race with speed 0 for 3 minutes).

and so, the race was 199.9 s long.

Answer:

23 grams

Explanation:

The atomic weight of sodium (Na) is approximately 23. Therefore, one mole of sodium atoms weighs approximately 23 grams.

Answer:

Plasma is by far the most common form of matter. Plasma in the stars and in the tenuous space between them makes up over 99% of the visible universe and perhaps most of that which is not visible. On earth we live upon an island of "ordinary" matter.

Answer: The correct answers are C. and D.

Explanation:

No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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Explanation:

Image Shadow

2. We are able to see images when light refraction enters our eyes.

In the case of shadow no light enters our eyes.

3. Image contains colour, structure etc. of the object.

Shadow does not give any information about the object as it is colourless

Answer:

We know that an image is a picture of an object while shadow is formed an object comes in between the surface and light. ... The formation of image takes place when the light rays are reflected by an object. The formation of shadow takes place when the light falls on an opaque object.

Answer:

\(V=1.76\times 10^{-4}\ V\)

Explanation:

Given that,

The diameter of a wire, d = 1.628 mm

Radius, r = 0.814  mm = 0.000814m

Current, I = 12.5 mA

The length of the wire, l = 2m

The resistivity of the wire, \(\rho=1.47\times 10^{-8}\ \Omega-m\)

We need to find the potential difference across the wire. We know that the resistance of the wire is given by :

\(R=\rho\dfrac{l}{A}\)

Also, V = IR

\(\dfrac{V}{I}=\rho\dfrac{l}{A}\\\\V=\dfrac{\rho l I}{A}\\\\V=\dfrac{1.47\times 10^{-8}\times 2\times 12.5\times 10^{-3}}{\pi \times (0.000814)^2}\\\\V=1.76\times 10^{-4}\ V\)

So, the potential difference of the wire is \(1.76\times 10^{-4}\ V\).

A) Q1 = (3/2)P1V1[A – 1]

B) W2 = P1V1(In A)

C) W3 = P1V1(1 – A)

The only source of energy for a monatomic ideal gas (such as helium, neon, or argon) is translational kinetic energy.

A) first law of thermodynamics we have;

ΔU = Q – W

Where,

ΔU = change in internal energy

Q = the heat absorbed

W = the work done

the first process occurs at constant volume, the work done is zero:

Thus,

ΔU = Q – 0

ΔU = Q

The change in internal energy is;

ΔU = nCvΔt

where;

n = number of moles of the gas

R =  gas constant,

Cv =  specific heat at constant volume

Δt = change in temperature i.e T2 – T1.

Using the ideal gas law, find an n and Δt

P1V1 = nRT1

n = P1V1/RT1

T1 = P1V1/nR

the specific heat at constant volume is Cv = (3/2)R

From the question, pressure has reached AP1, calculate the temperature T2 by using the ideal gas law;

AP1V1 = nRT2

T2 = AP1 V1/ nR

heat added in terms of p1, V1, and A

Q = ΔU = nCv(T2 – T1)

From earlier

T1 = P1V1/nR

Putting equation of T2 and T1 into the energy equation;

Q = nCv((AP1 V1/ nR) – P1V1/nR)

Q = Cv • P1V1/R (A – 1)

we saw that Cv = (3/2)R. Thus,

Q = (3/2)R • P1V1/R (A – 1)

Q = (3/2)P1V1[A – 1]

B) Here again, work done in step 2 in terms of p1, V1, and A.

The process is an isothermal process because temperature is constant; so work done W = nRT In(V2/V1)

T = T1  (temperature is constant)

From earlier,

n = P1V1/RT1 and

But in this process, it’s

n = P1V1/RT1 and thus,

V2 = nRT2/P1

Also,  T2 = AP1 V1/ nR

V1 = nRT2/AP1

Putting the values into, W = nRT In(V2/V1),

W = (P1V1/RT1) • RT1 • In((nRT2/P1)/(nRT2/AP1)

W = P1V1(In A)

C) In step 3,we have and isobaric process because the pressure is constant.

Work done; W = P(V1 – V2)

V2 is the final volume while V1 is the the initial volume

P is P1 (isobaric process).

From earlier, we saw that,

V1 = nRT2/AP1 and V2 = nRT2/P1

And that T2 = AP1 V1/ nR

Thus,

V1 = V1 and V2 = AV1

Thus, W = P1(V1 – AV1) = P1V1(1 – A)

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I understand that the question you are looking for is "A monatomic ideal gas has pressure p1 and temperature T1. It is contained in a cylinder of volume V1 with a movable piston, so that it can do work on the outside world. Consider the following three-step transformation of the gas: The gas is heated at constant volume until the pressure reaches Ap1 (where A>1). The gas is then expanded at constant temperature until the pressure returns to p1. The gas is then cooled at constant pressure until the volume has returned to V1.

It may be helpful to sketch this process on the pVplane.

How much heat Q1 is added to the gas during step 1 of the process?

Express the heat added in terms of p1, V1, and A.

How much work W2 is done by the gas during step 2?

Express the work done in terms of p1, V1, and A.

How much work W3 is done by the gas during step 3?

If you've drawn a graph of the process, you won't need to calculate an integral to answer this question.

Express the work done in terms of p1, V1, and A."

When six current-carrying conductors are run in the same conduit or cable, the ampacity of each conductor shall be lowered to 80 percent of its ampacity. What is the rule of thumb for determining the number of current-carrying conductors that can be run in a single conduit or cable without exceeding the ampacity of the conductor.

When multiple conductors are used in a single cable or conduit, each current-carrying conductor produces heat due to the flow of electrical current through it. This causes the temperature of the cable or conduit to increase, causing a reduction in the ampacity of the conductors.

To prevent overheating and potential fires, electrical codes place restrictions on the number of current-carrying conductors that can be installed in a single cable or conduit. When six or more current-carrying conductors are installed in a single conduit or cable, the ampacity of each conductor must be reduced .

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Answer:

25 m/s²

Explanation:

F = m × a

50 N = 2 kg × a

a = 50 N : 2 kg

a = 25 N/kg

a = 25 m/s²

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Answer:

D. 72.9 cm/s towards the wall

Approximately 104 pounds of Uranium 235 is needed for the critical mass to occur. If it is less than 104 pounds, no reaction will occur.

An isotope of uranium called uranium-235 makes up about 0.72 percent of natural uranium. It is fissile, which means that it may support a nuclear chain reaction, in contrast to the dominating isotope uranium-238.

A chain reaction is a series of reactions in which a reactive product or byproduct sparks the occurrence of other reactions.

Therefore, approximately 104 pounds of Uranium 235 is needed for the critical mass to occur. If it is less than 104 pounds, no reaction will occur.

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Therefore, the thermal conductivity of argon (CV,m = 12.5 J·K−1·mol−1, σ = 0.36 nm2) at 298 K is 137.7 mW/(m·K).

The thermal conductivity (λ) of a gas can be estimated by the kinetic theory of gases using the equation:λ = 1/3 × Cv, m × vλ = thermal conductivity Cv,m = heat capacity at constant volume v = average speed of the molecules

The equation to calculate the average speed of the molecules: v = √((8 × R × T) / (π × M))

Where, R is the gas constant, T is the temperature in Kelvin, and M is the molar mass of the gas. Here, we have to calculate the thermal conductivity of argon (CV,m = 12.5 J·K−1·mol−1, σ = 0.36 nm2) at 298 K.

So, let's plug in the values. v = √((8 × R × T) / (π × M))√((8 × 8.314 × 298) / (π × 0.04)) = 330.9 m/sλ = 1/3 × Cv,m × vλ = 1/3 × 12.5 × 330.9λ = 137.7 mW/(m·K)

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