Exercise 3: Two bullets are fired at the same time with the same kinetic energy. If one bullet has twice the mass of the other, which has the greater speed and by what factor? Which can do the most work?
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- A 11 g particle is moving to the left at 17 m/s. How much net work must be done on the particle to cause it to move to the right at 45 m/s ? Express your answer to two significant figures and include the appropriate units. µA ? W = Value Units Submit Request Answer Provide Feedback Next >The energy needed to increase the speed of a certain car from 22 m/s to 54 m/s is 2900 kJ. A) What is the mass of the car? B) At what speed is the cars kinetic energy equal to 1500 kJ? C) The car is driven up pikes Peak, an elevation gain of 5500 feet from the base. What is the change of potential energy of the car? give the answer in Joules. Jack and Jill are pushing a box across a horizontal floor, but in opposite directions. If the box is moving to the left, Jack is pushing left, and Jill is pushing to the right, what are the signs of the work they do on the box? (a)WJackWJack is negative and WJillWJill is positive (b)WJackWJack is positive and WJillWJill is positive(c) WJackWJack is negative and WJillWJill is negative(d) WJackWJack is positive and WJillWJill is 0 (e) WJackWJack is positive and WJillWJill is negative
- 1. The pitcher throws the 0.145 kg baseball towards the catcher at 42 m/s. (a) How much kinetic energy does the baseball have? (b) How much work does the catcher's mitt do on the ball during the catch? (c) If the catcher's mitt recoils 12 cm during the catch, how much force did the ball exert on the catcher?Can the work done by Friction be zero? In a case where static friction exists, the object does not move and the change in kinetic energy is also zero? W = Fd = ?KE = 0? What did I do wrong?A small car and a semi-truck have the same total mechanical energy. Which of the following CANNOT be true? Question 3 options: The car must be moving faster than the truck and the truck and car are at the same height. The car is going the same speed as the truck and the truck and car are at the same height. The car is going the same speed as the truck and the car is at a higher elevation than the truck. The car is at a higher elevation and both the car and the truck are stationary.
- In the pitching motion, a baseball pitcher exerted an average horizontal force of 80 N against the 0.15 kg baseball while moving it through a horizontal displacement of 2.2 m before he leased it. How much work did the pitcher do to the baseball as a result of this force? Group of answer choices 120 J 176 J 12 J 26.4 J0 Question 3 A block of mass m = 1 kg is sliding on a horizontal surface with initial velocity vo = 2 m/s. The block is brought to a stop by kinetic friction in a distance of 4 m. What is the work done by the force of friction acting on the block? 2J O-0.5 J O-2 J 08 J 0.5 J O-8 J 1 pts Question 4 1 ptsThe two masses in the figure are released from rest. After the 3.0-kg mass has fallen 1.5 m, it is moving with a speed of 3.8 m/s. How much work is done during this time interval by the frictional force on the 2.0 kg mass? 2.0 kg 3.0 kg O-20 J -28 J -8.0 J O-17 J 0-12 J
- The driver of a 760.0 kg car decides to double the speed from 21.1 m/s to 42.2 m/s. What effect would this have on the amount of work required to stop the car, that is, on the kinetic energy of the car? KE x 105 J KE = × 105 J (select) v times as much work must be done to stop the car.Briefly explain why you do no work on a 18 kg backpack when walking a horizontal distance of 62 m at constant speed. Also briefly explain how this is (or is not) consistent with the conservation of energy. Hint: In your answer, make sure that the explanation is related to a physics principle covered in this unit.