Answer:
The speed of sound is the distance traveled by sound per unit time, which is 347.0 m/s. The hiker hears the echo return 2.0 seconds later, which means that the sound traveled twice the distance between the hiker and the rock wall.
Let d be the distance between the hiker and the rock wall. Then, the total distance traveled by sound is 2d (the sound traveled from the hiker to the rock wall and back).
Using the formula distance = speed x time, we can write:
2d = speed x time taken
2d = 347.0 m/s x 2.0 s
2d = 694.0 m
Dividing both sides by 2, we get:
d = 347.0 m/s x 2.0 s / 2
d = 347.0 m
Therefore, the distance between the hiker and the rock wall is approximately 347.0 meters
Explanation:
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what is the condition for the first dark fringe through a single slit of width w?
The condition for the first dark fringe through a single slit of width w is when the path difference between the rays passing through the top and bottom edges of the slit is half a wavelength, which causes destructive interference and results in a dark band on the screen.
This can be expressed mathematically as sin θ = λ/w, where θ is the angle between the direction of the incoming light and the direction of the diffracted light, λ is the wavelength of the light, and w is the width of the slit.
The condition for the first dark fringe in a single-slit diffraction pattern occurs when the path difference between adjacent rays is equal to half the wavelength (λ/2). This can be represented by the equation:
sin(θ) = λ/(2w)
where θ is the angle of the first dark fringe, λ is the wavelength of the light, and w is the width of the slit.
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What is the frequency of an electromagnetic wave that has a wavelength of 2.2 x 10^-2 m?
With a wavelength of 2.2 x 10^-2 m, the frequency of the electromagnetic wave is 1.36 x 10^10 Hz.
The frequency of an electromagnetic wave can be calculated using the formula:
frequency = speed of light / wavelength
The speed of light is a constant value of approximately 3 x 10^8 meters per second. Therefore, to find the frequency of an electromagnetic wave with a wavelength of 2.2 x 10^-2 m, we can plug these values into the formula:
frequency = (3 x 10^8 m/s) / (2.2 x 10^-2 m)
frequency = 1.36 x 10^10 Hz
Therefore, the frequency of the electromagnetic wave with a wavelength of 2.2 x 10^-2 m is 1.36 x 10^10 Hz.
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Which of the following is defined as a force that pushes and pulls the current through the circuit? Group of answer choices D) resistance B) electricity A) current C) voltage
Answer:
C voltage
Explanation:
Voltage is the change in electric potential so basically current flows from high potential to low potential due to voltage.
Which is true? if the angle between them is smaller than that given by Rayleigh's criterion. Two objects are resolvable Two objects are resolvable if the angle between them is equal to that given by Rayleigh's criterion. O Two objects are resolvable if the angle between them is greater than that given by Rayleigh's criterion.
The correct statement is: Two objects are resolvable if the angle between them is smaller than that given by Rayleigh's criterion.
Rayleigh's criterion, also known as the Rayleigh criterion of resolution, provides a criterion for determining the minimum angle at which two objects can be resolved as separate entities in an optical system, such as a telescope. According to Rayleigh's criterion, two point sources are just resolvable if the central maximum of the diffraction pattern produced by one source coincides with the first minimum of the diffraction pattern produced by the other source.
In practical terms, this means that if the angle between the objects is smaller than the angle determined by Rayleigh's criterion, they will appear as separate and distinct objects. On the other hand, if the angle between the objects is equal to or greater than the angle given by Rayleigh's criterion, they will blend together and cannot be resolved as separate entities.
Therefore, for two objects to be resolvable, the angle between them must be smaller than the angle specified by Rayleigh's criterion. This criterion defines the limit of resolution and is influenced by factors such as the wavelength of light and the aperture size of the optical system.
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Sort each item to the correct location,
Geocentric Model or
heliocentric model.
The orbits of the planets are circular.
Earth is at the center of the solar system.
Includes five planets
The sun is the center of the solar system
The orbits of the planets are elliptical
Includes eight planets
Answer:
the orbits of the planets are elliptical
the sun is the center of the solar system
includes 9 planets
"Explain how those in marginalised groups may be impacted by
trauma, discrimination, negative attitudes and exclusion. In your
response, refer to the needs of: ▪ people with disability ▪ those
who"
Marginalized individuals, including people with disabilities and those who identify as LGBTQ+, can experience significant impacts due to trauma, discrimination, negative attitudes, and exclusion. These factors contribute to physical and psychological harm, hinder access to opportunities and resources, and perpetuate systemic inequalities.
Marginalized individuals, such as people with disabilities, face unique challenges that can exacerbate the impact of trauma, discrimination, negative attitudes, and exclusion. Trauma experienced by individuals with disabilities may result from direct incidents or from the effects of living in a society that is not fully inclusive. Discrimination and negative attitudes towards people with disabilities can lead to social isolation, limited employment prospects, and reduced access to healthcare and education. This exclusion can have long-lasting effects on their mental health, self-esteem, and overall well-being. Similarly, individuals who identify as LGBTQ+ may also face trauma, discrimination, negative attitudes, and exclusion. LGBTQ+ individuals often encounter higher rates of bullying, harassment, and violence due to their sexual orientation or gender identity. These experiences can lead to psychological distress, anxiety, depression, and even post-traumatic stress disorder (PTSD). Discrimination and exclusion from healthcare, housing, employment, and social support systems further compound the challenges faced by LGBTQ+ individuals, hindering their ability to thrive and fulfill their potential.
In both cases, the impacts of trauma, discrimination, negative attitudes, and exclusion are far-reaching. They can contribute to a cycle of disadvantage, limiting opportunities for personal growth, social participation, and economic advancement. Recognizing and addressing these issues is essential for fostering a more inclusive society that supports the needs and rights of marginalized groups, empowering individuals to overcome the barriers they face and promoting their overall well-being.
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How do charging and discharging compare? How can charging go unnoticed,
but discharging is often accompanied by a shock?
A dishwasher has a power rating of 1200 W. Work out how long it would take to transfer 480 kJ of energy.
The dishwasher would need to transfer 480 kJ of energy for 400 seconds, or 6 minutes and 40 seconds.
How are power and force related?Power is determined by the product of force, velocity, and distance traveled (in the force's direction). For those looking to enter the teaching profession in the state of Uttar Pradesh, this is a fantastic opportunity. Voltage and current together produce electrical power P=VXI.
time = energy / power
480 kJ = 480,000 J
time = energy / power
time = 480,000 J / 1200 W
time = 400 seconds
Hence, for the dishwasher to transfer 480 kJ of energy, it would take 400 seconds, or 6 minutes, 40 seconds.
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multi choice
12) When you move your hand or foot, your body has converted potential energy into ________ energy.
Answer: It’s kinetic energy
Explanation: when you move your hand or foot, your body has converted potential energy into kinetic energy.
A voltmeter is connected in _____ with the component whose voltage is to be measured.
Answer: parallel
Explanation: A voltmeter is connected in parallel with the component whose voltage is to be measured.
Simple pendulum is system in which a bob is attached to a string and oscillates when it is disturbed from equilibrium. Suppose time period of oscillation of simple pendulum depends on length (l) of string, mass (m) of the bob, and acceleration due to gravity (g). Derive expression for its time period using method of dimensions.
The expression for the time period using method of dimensions is \(T = [L]^{1/2}\times [LT^{-2}]^{-1/2}\).
Period of oscillationThe period of oscillation of a simple pendulum is the time taken for the pendulum to make a complete rotation.
The period of oscillation of a simple pendulum is calculated as;
\(T = 2\pi \sqrt{\frac{l}{g} }\)
where;
L is length (m)
g is acceleration due to gravity (m/s²)
The expression for the time period using method of dimensions is given as;
\(T = [L]^{1/2}\times [LT^{-2}]^{-1/2}\)
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Nancy roller skates with a constant speed
of 16 km/h. How long will she take to travel
a distance of 24 kilometers?
a. Consider a light bulb connected to a battery with wires. How must the light bulb be connected in order for it to light?
b. Identify the relevant parts of the bulb and battery. Explain, using the concept of potential difference, why and how your configuration causes the bulb to light. Do not use the phrase "complete circuit".
To light the bulb, it must be connected to the battery in a way that the positive terminal of the battery connects to one end of the bulb's filament and the negative terminal connects to the other end of the filament.
The relevant parts of the bulb are the filament and the two contact points, while the battery has a positive terminal and a negative terminal.
When the bulb is connected in the configuration described above, a potential difference is created between the positive and negative terminals of the battery.
This potential difference causes an electric current to flow through the wires and the filament of the bulb.
The filament, made of a material with a high resistance, heats up due to the current flow and begins to emit light as a result.
Hence, A light bulb must be connected to a battery such that its filament is connected between the positive and negative terminals of the battery. This creates a potential difference, allowing the current to flow through the filament and causing it to emit light.
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achievement and challenges of science and technology explain?
Science and technology have had a significant influence on society, with both successes and difficulties.
The achievements can be noted as -
Medical Growth - Scientists and medical professionals have been able to create vaccinations, medicines, and surgical techniques thanks to advancements in technology that save millions of lives annually. This covers developments like cancer therapy, organ transplantation, and enhanced medical imaging. Communication Growth - People may now contact and communicate with one another more easily because to developments in communication technology. People may now communicate globally thanks to advancements in communication technologies, like the telephone and the internet.Commutation - Transport has also been enhanced by science and technology, becoming quicker and more effective. This includes technological advancements like electric autos, high-speed trains, and aeroplanes.The challenges can be noted as -
Environmental Degradation - Environmental degradation, including pollution, deforestation, and climate change, has been brought on by the development and usage of technology.Expensive - It may be expensive to develop and adopt new technology, which might put people and communities at a financial disadvantage. This may restrict access to these breakthroughs and worsen already existing inequities.Dependency - Genetic engineering, artificial intelligence, and privacy are just a few of ethical issues that have been brought up by these advancements. It is crucial to consider possible effects of these breakthroughs and make sure they are applied for the benefit of everybody.Read more about science and technology on:
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Which of these is not one of the following of the five principles of communication?
A: listen and respond thoughtfully to others
B: effectively use and intercept non-verbal messages
C: appropriately adapt messages to others
D: use sarcasm and verbal cues to improve messages
Answer:
The answer is D.
Use sarcasm and verbal cues to improve messages
Answer:
d
Explanation:
Which is not a benefit of a sporting organization? a. To control all of the people in the community b. Bringing people together and social interaction c. Promote a healthy lifestyle
Answer: a. To control all of the people in the community
Explanation:
The sport organization help in bring people of different communities together. It removes any kind of discrimination based on caste, gender, race, and others. People are united in a single team to bring about unity in them. The sport organization does not control the people in the community instead can bring change in their thinking and opinion about people of the other community. The sports activities are recreational in nature, they build social interaction between people of different communities, control good health, make communities safer.
How did adding mushrooms affect trees?
Calculate the thermal conductivity of argon (CV,m = 12.5 J·K−1·mol−1, σ = 0.36 nm2) at 298 K.
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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Date:
Page:
# Excercise.
7.
A very short answer questions.
what is acceleration due to gravity? what is
value of 'g’ on equatorial region and
polar region of the earth?
the
Answer:
See the answer below
Explanation:
Acceleration due to gravity (g) is the accelerational force experienced by a body as a result of the influence of the earth's gravitational force. It is a vector quantity, that is, it has both magnitude and direction.
The acceleration due to gravity is inversely proportional to the square of the radius of the earth. Hence, g at the equatorial region is slightly lesser (9.780 m/s2) than that of the polar regions (9.832 m/s2) of the earth because the earth bulges at the equator leading to a higher radius than at the poles.
An astronaut landed on the moon. He decided to test Newton's Laws of Motion by playing golf on the moon.
The golf ball was hit. The ball traveled much farther on the moon than a golf ball that is hit with the same force on the Earth. Which statement BEST explains this phenomenon?
Select TWO correct answers.
The unbalanced force of friction from Earth's atmosphere slows the ball down, causing the ball not to travel as far.
The moon's gravitational pull is greater than the pull of the Earth, causing the ball to travel farther.
The ball's inertia is greater on the moon because of the space, causing it to travel farther.
The mass of the ball is the same on the Earth and the moon, so the ball will travel farther on the moon.
The moon's gravitational pull is not as strong as the Earth's gravitation pull, causing the ball to travel a greater distance.
Here are the two claims: Because of the moon's weaker gravity, the ball has a higher inertia and moves farther. As the moon has no atmosphere, there is no air resistance to cause the ball to slow down.
What happens if a golf ball is struck on the moon?The ball would fly six times further and land about 2 km (or 1.25 miles) further on the moon, where the gravity acceleration is six times smaller. A professional golfer could hit a drive on the moon this far if they had the right equipment.
On the moon, did astronauts play golf?On the moon, Alan Shepard of Apollo 14 played golf. He held a contingency sample extension handle with a no. 6 iron head in his hand as his "club." For personal things, each astronaut was given a set amount of weight. Shepard took the club head and three golf balls with his.
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A downed pilot fires a flare from a flare gun. The flare an initial speed of 250 m/s and is fired at an angle of 35° to the ground. Find the maximum height the flare will reach. How long does it take for the flare to reach its maximum altitude ? What will be the final vertical velocity ?
Answer:
Maximum Altitude: vi = 250 m/s At the maximum height q = 35° vy,f = vy,i − g∆t = 0 g = 9.81 m/s2 vy,i = vi (sin q) = g∆t ∆t = vi (si g n q) = (250 9 m .8 / 1 s) m (s / i s n 2 35°) ∆t = 15 s
Vertical Velocity: Vyf = 439.09
Explanation:
The time it will take to reach its maximum altitude will be 14.63 seconds, and the final vertical velocity will be 143.4 m/s.
What is Speed?Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, speed is a scalar value, but velocity is a vector.
The velocity at time t = 0 is known as the initial velocity (u). It is the rate at which motion initially manifests itself.
On the other hand, the final velocity is a vector number that represents the speed and direction of a moving body after it has experienced its maximum acceleration.
According to the question, the given values are :
Angle, θ = 35°
V₀ = 250 m/s
\(V_o_y=V_osin\theta\)
\(V_o_y\) = (250)(sin 35°)
= 250 × 0.573
\(V_o_y\) = 143.4 m/s.
Now, the time it will take to reach its maximum height will be :
\(t_m_a_x=V_o_y/g\)
= 143.4 / 9.8
\(t_m_a_x\)= 14.63 seconds.
Hence, the time it will take to reach its maximum altitude is 14.63 seconds.
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The velocity of sound in a medium increases with increasing
a. distance
b. amplitude
c. temperature
d. time
c- temperature
The speed of sound increases with increasing temperature .
If you drop a penny off the Empire State Building and it hits a car will it go though the car?
A penny dropped from the Empire State Building won't go through a car despite its high velocity. The limited mass and energy may cause minor damage.
If a penny is dropped from the Empire State Building and it hits a car, it is highly unlikely that it would go through the car. While a penny dropped from a significant height can reach a high velocity, it does not have enough mass or energy to penetrate through the structure of a car.
When the penny falls, it gains potential energy due to gravity, which is then converted into kinetic energy as it accelerates downward. However, the small mass of the penny limits its ability to cause significant damage upon impact. The kinetic energy it carries is not enough to overcome the structural integrity of a car's body, which is designed to withstand normal impacts and protect the occupants.
That being said, the impact of a falling penny can still cause minor damage to the car, such as a dent or scratch, depending on the angle and velocity at which it strikes. It's important to note that dropping objects from tall buildings is generally unsafe and should be avoided, as it can pose a risk to people on the ground.
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A speedy tortoise can run at 0.11 m/s, and a hare can run 19 times as fast. In a race, they start at the same time, but the hare stops to rest for 2 min, so the tortoise wins by a shell (20 cm). How long does the race take
The Time taken for the race is 36 minutes and 22 seconds.
Given the speed of tortoise is 0.11 m/s and the speed of hare is 19 times faster than that of tortoise. So the speed of hare is 19*0.11 = 2.09 m/s.At the start of the race both tortoise and hare start at the same time, so at the point where the hare stops to rest for 2 minutes, tortoise would be ahead of hare by a distance of (20/1000) km.Now hare resumes running and tries to overtake tortoise, let’s say it overtakes tortoise after t seconds. So we have:0.11t + 0.0209(t-120) = 0.2 km. Solving for t gives us t = 2176/1101 hours, which is approximately equal to 1.975 hours.The total time taken by the hare and tortoise is 1.975 hours + 2 minutes, which is equal to 36 minutes and 22 seconds.Thus, the race takes 36 minutes and 22 seconds.
The time taken for the hare and tortoise to complete the race is approximately 36 minutes and 22 seconds.
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It is 5.00 km from your home to the physics lab. As part of your physical fitness program, you could run that distance at 10.0 km/hr (which uses up energy at the rate of 700 W ), or you could walk it leisurely at 3.00 km/hr (which uses energy at 290 W ).A. Which choice would burn up more energy? 1. running.2. walking.B. How much energy (in joules) would it burn?C. Why is it that the more intense exercise actually burns up less energy than the less intense one?
Answer:
a. Walking burns up more energy.
b. 1740 kJ
c. This is because more intense exercise releases a lot of energy in a short period of time, whereas, less intense energy releases it energy gradually over a long period of time.
Explanation:
a. We know energy W = Pt where P = power and t = time.
Now for walking, t = d/v where d = distance = 5.00 km and v = speed = 3.00 km/hr and P = 290 W
So, t = d/v = 5.00 km/3.00 km/hr = 5/3 hr = 5/3 × 3600 s = 6000 s
W = Pt = 290 W × 6000 s = 1740000 = 1740 kJ
Now for running, t = d/v where d = distance = 5.00 km and v = speed = 10.00 km/hr
So, t = d/v = 5.00 km/10.00 km/hr = 0.5 hr = 0.5 × 3600 s = 1800 s and P = 700 W
W = Pt = 700 W × 1800 s = 1260000 = 1260 kJ
Since walking burns up 1740 kJ and running burns up 1260 kJ, walking burns up more energy.
b. It burns up 1740 kJ
c. This is because more intense exercise releases a lot of energy in a short period of time, whereas, less intense energy releases it energy gradually over a long period of time.
On a velocity vs. time graph, what does it mean when the line crosses over the x-axis?
On a velocity - time graph, if the line crosses the x - axis it depicts that the object has started moving in the opposite direction.
Part A What is the gravitational potential energy of the Earth-Sun system? Express your answer to two significant digits and include the appropriate units. μÀ ? U = Value Units Submit Previous Answe
The gravitational potential energy of the Earth-Sun system is -2.2 x 10^33 joules. The negative sign indicates that it is a bound system with the potential energy being negative.
The gravitational potential energy between two objects can be calculated using the formula U = -GM m/r, where U is the gravitational potential energy, G is the gravitational constant, M and m are the masses of the two objects, and r is the distance between their centers of mass.
For the Earth-Sun system, the mass of the Earth (M) is approximately 5.972 x 10^24 kg, the mass of the Sun (m) is approximately 1.989 x 10^30 kg, and the average distance between them (r) is approximately 1.496 x 10^11 meters.
Plugging these values into the formula, we get:
U = -(6.67430 x 10^-11 Nm^2/kg^2) * (5.972 x 10^24 kg) * (1.989 x 10^30 kg) / (1.496 x 10^11 meters) = -2.2 x 10^33 joules
The gravitational potential energy of the Earth-Sun system is -2.2 x 10^33 joules. The negative sign indicates that it is a bound system with the potential energy being negative.
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Why is the teacher in the bed-of-nails demonstration unharmed? Would having even MORE nails in the bed-of-nails demonstration be harmful or helpful to the teacher? Explain.
The teacher in the bed-of-nails demonstration is unharmed because the weight of his body is evenly distributed over a large number of nails.
This reduces the pressure on each individual nail and prevents them from puncturing his skin.
Having even more nails in the bed-of-nails demonstration would not necessarily be harmful, as long as the weight of the person lying on the nails was still evenly distributed.
However, if the weight was concentrated on a smaller number of nails, it could be more harmful as the pressure on each nail would be greater.
Ultimately, the number of nails in the bed-of-nails demonstration is less important than how the weight is distributed to prevent harm to the person lying on them.
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The operating voltage of a power line is increased from 300 kV to 600 kV. If the amount of power delivered to customers over the power line remains constant, how does the power loss in the power line at 300 kV compare to the power loss at 600 kV? Explain.
As the voltage is increased, the power losses would decrease.
What is the power loss?We now that the term power loss has to do with the loss that occurs as a result of the heating effect of current. The transmission of power at high voltage tends to reduce the power losses that accompanies the transmission of power at a lower voltage and a high current.
As such, when we have the operating voltage of a power line is increased from 300 kV to 600 kV we can see that the voltage has doubled and this would mean that the transmission is now at a much higher voltage which would reduce the power losses even further.
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A boat travels with a velocity equal to 14.0 meters per second, east in 6.15 seconds. What distance in meters does the boat travel?
Answer:
Distance, d is 86.1 meters.
Explanation:
Given the following data;
Time, t = 6.15secs
Velocity = 14m/s
Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.
Mathematically, velocity is given by the equation;
\(Velocity = \frac{distance}{time}\)
\(V = \frac{d}{t}\)
\(d = Vt\)
Substituting into the above equation;
\(d = 14 * 6.15\)
d = 86.1m
Hence, the distance traveled by the boat is 86.1 meters.