5. Sheryl is driving along the highway in an 894 kg car. She initially drives at a velocity of 50 m/s. After 38.5 s, she increases the velocity by 70% of the initial velocity. a. Initially, if Sheryl is driving for 12 s, how much work was done? b. How much power was needed for the car to increase its velocity?
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- 4. A 4.21-kg watermelon is released from rest from the roof of an 27.8-m-tall building. a. Calculate the work done by gravity on the watermelon as it falls from the roof to the ground. b. Calculate the net work done on the watermelon as it falls to the ground. Show clearly how you get your answer. Just before it hits the ground, what is the watermelon's kinetic energy? Show clearly how you get your answer. d. Just before it hits the ground, what is the watermelon's speed? (Use energy techniques to answer this.) C.11. How much work does Amanda's car experience compared to Bertha's? Amanda and Bertha are in a car race. Their cars have the same mass. At one point in the race, they both change their speeds by 10 m/s in 2 seconds. Ignore air friction. 2s later 2s later 10 m/s 20 m/s 20 m/s 30 m/s Amanda Bertha a. Amanda's car experiences less work b. Amanda's and Bertha's car experience the same amount of work c. Amanda's car experiences more work. O d. Only Rihanna would know. (Work Work Work Work Work...) 96 altAn elevator is designed so that when it travels upward, it has constant acceleration from rest to its cruising speed of 2.0 m/s in a time of 4.0 seconds. The elevator has a mass of 625kg. Assume friction is ignored. A. Determine the average power (in W) of the elevator motor while its accelerating upward to its cruising speed. B. Determine the motor power (in W) when the elevator is moving upward at its cruising speed.
- A moving object is subject to conservative forces only. When its kinetic energy dereases by 10 J, what happens to its potential energy? A. It increases but not necessarily equal to 10 J. B. It increases by 10 J C. It decreases by 10 J D. It remains the same.24. A skier of mass 70 kg is pulled up a slope by a motor-driven cable. How many horsepower output must a motor have to pull him 100 m up a 30° frictionless slope at a constant speed of 2 m/s? a.700 b. 0.94 c. 746 d. 1.06 a b d1. Power is how strong someone or something is. C. how mưch work is being done, how much force is being used. A. В. D. how fast work is being done. 2. In which situation is a person doing work on an object? . A. A school crossing guard raises a stop sign that weighs 10 N. A student walks 1 m/s while wearing a backpack that weighs 15 N. A man exerts a 350 N force on a rope attached to a house. A worker holds a box 1 m off the floor. В. С. D. - 3. Juan and Anita each lift an identical stack of books the same distance onto a table, but Anita does the job twice as fast. Therefore, her actions involve twice as much A. work input. work output. C. power. D. efficiency. В. 4. Which of the following is NOT an example of work according to the scientific definition of work? A. playing baseball B. reading a chapter for homework C. pushing a wheelbarrow D. bowling 5. A man applies a force of 500 N to push a truck 100 m down the street. How much work has been done? A. 500,000 J В. 5,000 J C. 510 J…
- As a simple pendulum swings back and forth, the forces acting on the suspended object are the gravitational force, the tension in the supporting cord, and air resistance. Describe the work done by the gravitational force while the pendulum is swinging. a. Positive in increasing velocity on the downswing; negative in decreasing velocity on the upswing b. Negative in increasing velocity on the downswing; positive in decreasing velocity on the upswing c. Positive in decreasing velocity on the downswing; negative in increasing velocity on the upswing d. Negative in increasing velocity on the downswing; negative in decreasing velocity on the upswing A satellite in circular orbit around the Earth moves constant speed. This orbit is maintained by the force of gravity between the Earth and the satellite, yet no work is done on the satellite. How is this possible? a. No work is done if there is no contact between objects. b. No work is done because there is no gravity in space. c. No work…1. a brick with mass 30 kg rests a top a 12 m tall wall. What is the brick's gravitational potential energy relative to the ground? a. 2400 J b. 360 J c. 240 J d. 3600 J 2. A brick with mass 20 kg rests atop a 12 m tall wall. The brick is nudged off the wall, and falls to the ground. How fast will the brick be going as it hits the ground? Neglect air resistance. a. 12 m/s b. 120 m/s c. 0 m/s d. 15.5 m/sC02
- In the Figure below, we see a 500 gram block resting on the horizontal portion of a "track", whose left end is curved upwards. The horizontal portion of the track is frictionless, except for a 50.0 cm long “rough" portion, shown in the Figure, where the coefficient of kinetic friction is 0.300. The curved portion of the track is frictionless. The block is held against a spring (which has a stiffness constant of 500 N/m), compressing the spring by 10.0 cm. Then the block is released from rest. (NOTE: The block is not attached to the spring; it is just held against the end of the spring.) For simplicity, assume that g = 9.80 m/2. 50.0 cmA box of mass 10 kg initially was at rest on a frictionless horizontal table. After applying a force of 10 N, the box moves in the right direction at a speed of 5 m/s. What is the work done by the external force on the box? Select one: O a. 50 J Ob 450 J O c. 125 J O d. 100 JA 2 kg block is placed at rest on a frictionless incline that is angled 25 degrees. It is released and slides 30.0 cm (distance s) along the incline before reaching the floor. The floor exerts a kinetic friction force, F, of 1 N on the block. a. What is the total work done on the block? b. How far does the block slide (distance x) on the flat section of the floor (different from s) before it stops?