5. A 12 N object is attached vertically by a string to a frictionless car that runs along a level track. The car with mass m kg covers a distance of 1.25 m in 5.0 s after it starts from rest. Find the loss in potential energy of the 12 N object in falling through a distance of 1.25 m A. 15 J B. 30 J C. 45 J D. 60 J
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5. A 12 N object is attached vertically by a string to a frictionless car that runs along a level track. The car with mass m kg covers a distance of 1.25 m in 5.0 s after it starts from rest. Find the loss in potential energy of the 12 N object in falling through a distance of 1.25 m
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- A box of mass 4.0 kg hangs by a cable from the ceiling of an elevator. The elevator is moving down at a steady speed of 5.0 m/s for 8.0 m. Use g = 10 m/s2. Match the answers with questions. m v the final kinetic energy of the box (Kf) А. -320 J v the change in kinetic energy of the box (AK) В. 20 J C. 320 J D. 50 J E. -20 J F. -50 J G. OJBelow is the potential energy diagram for a 50 gram particle. If the particle's mechanical energy is 7J: 10 U (1) 9 8 7 6 5 4 3 2 1 0 1 2 3 4 6 7 8 9 10 11 12 x (cm) A. Draw a line corresponding to the total Energy on the diagram. B. Assume the particle is moving in the positive x direction. Where is the particle speeding up? C. Assume the particle is moving in the positive x direction. Where is the particle lowing down? D. Where are any turning points in the particle's motion? E. What is the particle's speed at x=5 cm? F. What is the particle's maximum kinetic energy? Where does that occur? G. Suppose the particle's energy is decreased to 4J while the particle is between positions x = 7 cm and x = 9 cm. What is the particle's new maximum speed? Where does that occur?A 40 N object has 80 joules of potential energy. The object is at a height of 0.5 meters. True or false
- 2. A 1050 J of work is done by a post-person when pushing a parcel with a mass of 33.2 kg with a horizontal force at a constant speed across a level, rough surface for 8.17 m. Draw a free-body diagram. b. What is the horizontal force applied by the post person? c. What is the coefficient of kinetic friction between the parcel and the surface?8. A 30.00-kg child initially at rest slides down a playground slide from a height of 2.80 m above the bottom of the slide. If her speed at the bottom is 2.30 m/s, how much energy is lost due to friction? for 60 ss f60 s ssf60 f60 ssfcA 500 kg cart rests atop a hill 30.0 m high on a roller coaster. Its gravitational potential energy is measured relative to the bottom of the hill. The cart then rolls down the hill. Which of these best describes what is happening in this situation? a. the total mechanical energy of the cart is decreasing, the kinetic energy of the cart is increasing, and the gravitational potential energy of the cart is increasing b. the total mechanical energy of the cart is increasing, the kinetic energy of the cart is increasing, and the gravitational potential energy of the cart is increasing c. the total mechanical energy of the cart is increasing, the kinetic energy of the cart is increasing, and the gravitational potential energy of the cart is decreasing d. the total mechanical energy of the cart is increasing, the kinetic energy of the cart is decreasing, and the gravitational potential energy of the cart is increasing e. the total mechanical energy of…
- Question 2 D F, (N) + x (m) 0.10 0.05 The graph above shows a conservative force Fx as a function of position x acting on an object in a closed system. If this is the only force acting on the object, what happens to the potential energy of the system as the object moves from 0 m to 0.10 m? A It increases only. It decreases only. It increases and then decreases. It decreases and then increases. E It does not change.X Problem 1. An NFL punter punts a 0.02 kg football 100 meters into the air. A. What is the initial potential energy of the ball when it's at its peak? 0.02 x 9.8 x 100 = 19.6 j What is its final kinetic energy before it hits the ground? 1 o add speaker notes B. C. What is the velocity of the ball before it hits the ground? در نگاه U EVA2 W S X In a hydroelectric dam, water falls 35 m and then spins a turbine to generate electricity. 3 E D 80 C $ 4 R 888 F V 96 5 T G ^ 6 B ▾ Part A What is AU of 1.0 kg of water? Express your answer with the appropriate units. View Available Hint(s) AU= -340 J Y Submit ▾ Part B ✓ Correct SOLVE: The change in the potential energy of 1.0 kg of water in falling 35 m m is H Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the turbines each second to generate 48 MW of electricity? This is a typical value for a small hydroelectric dam. Express your answer in kilograms per second. ▸ View Available Hint(s) m 11s AU, -mgh=-(1.0 kg) (9.8 m/s²) (35 m) = -340 J = = Provide Feedback Submit MacBook Air Previous Answers & 7 N IG] ΑΣΦ | 3-4 U * 8 D-H I M @ JK ( 9 MOSISO DD O I भ ? O L kg/s command F10 P > ; C option + ? T I Next > delete re
- Q E mand 6. A 29.00-kg child initially at rest slides down a playground slide from a height of 3.30 m above the bottom of the slide. If her speed at the bottom is 3.00 m/s, how much energy is lost due to friction? $ 4 S $10 J NO R F 5 T G ^ 6 B MacBook Air H & N U J 8 M 9 K MOSISO H P command optionA 700 kgkg elevator accelerates upward at 1.4 m/s2m/s2 for 14 mm, starting from rest. A. How much work does gravity do on the elevator? Express your answer with the appropriate units. B. How much work does the tension in the elevator cable do on the elevator? Express your answer with the appropriate units. C.What is the elevator's kinetic energy after traveling 14 mm? Express your answer with the appropriate units.You push a box up a ramp (friction between the box and the ramp is not negligible). Call the initial state when you begin to push the box. Call the final state after you have pushed the box up the ramp a distance of 0.5 m and it is moving with a speed of 2 m/s For which of the following systems does the energy remain constant?A. System: box + ramp + Earth + youB. System: boxC. System: box + ramp + EarthD. System: youE. System: box + rampF. None of the above. Two cars are driving down the road. They notice that they are going to crash, so both drivers slam on the brakes. The cars skid, but still collide. The cars stick together and eventually slide to a stop. Call the initial state just before the drivers apply the brakes and the final state just after the collision had occurred. Treat this situation as realistically as possible. For which of the following systems does the energy remain constant?A. System: both carsB. System: both cars + the groundC. System: the second carD. System:…