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- 15. a person holds a 50 Newton object stationary for 10 seconds, 2 meters above the floor, what is the amount of work done?11. Can a normal force on an object ever do work on the object? Explain.10. Jared and Clay are climbing the stairs. Jared gets tired and stops halfway to the fourth floor. Clay makes it to the fourth floor v.. a problem. If Jared is twice as heavy as Clay, who has more potential energy? Explain.
- A CHEB hours, 58 minutes, 34 seconds. mpletion Status: QUESTION 12 Two objects interact with each other and with no other objects. Initially object A has a speed of 5 m/s and object B has a speed of 10 m/s. In the course of their motion they return to their initial positions. Then A has a speed of 4 m/s and B has a speed of 7 m/s. We can conclude: O A. mechanical energy was decreased by conservative forces OB. mechanical energy was increased by conservative forces OC. mechanical energy was decreased by nonconservative forces O D. mechanical energy was increased by nonconservative forces O E. the potential energy increased from the beginning to the end of the trip RENG RANG B one level to a higher level after passing through an intermediate valley. The track is in a distance d. The block's initial speed is vo = 5.4 m/s, the height differenWhen your hands are cold, you can rub them together to warm them. Explain the energy transformations that make this possible.Which requires more energy and by how much? Taking a 1000kg car from 0 mph (0m/s) to 30 mph (13.4m/s) or speeding up the same car from 60 mph (26.8m/s) to 70 mph (31.3m/s). Select one: O A. O mph to 30 mph by 90 kJ O B. 60 mph to 70 mph by 131 kJ O C. 0 mph to 30 mph by 41 kJ O D. 60 mph to 70 mph by 41 kJ O E. They take the same energy therefore the difference is OJ
- 1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?1. An apple hanging from a limb has potential energy because of its height. If it falls, what becomes of this energy just before it hits the ground? a. its total energy goes to zero b. its P.E. is transformed into kinetic energy c. its energy is transformed into the thermal energy of the apple and the ground d. its P.E. increases and just before it hits the ground it is doubled 2. An energy bar contains 105 kilocalories. How much work is the equivalent of this energy bar? a. 25.06 KJoules b. 439.95 kJoules c. 10.5 kJoules d. 0.14 Joules letter onlyElectric cars convert approximately 60% of the energy stored in their batteries into vehicle movement. How much energy stored in their batteries is required in order to bring a 2200 kg electric car from rest to a highway speed of 110 km/h? Ignore any effects of air drag.
- 3. A 100. kg skier starts at the top of a 300. m double-black diamond slope. How much energy was lost to friction if his velocity at the bottom of the hill is 15.0 m/s?What is the energy E required to accelerate a 1635 kg car from rest to 25 m/s? E = J Compared to the amount of energy required to accelerate a car from rest to 25 m/s, how much energy is required to accelerate the car from 25 m/s to twice that speed, 5.0 × 10' m/s? the same three times as much twice as much four times as much O O O