A moving hammer drives a nail into the wood. It has kinetic energy. a) True b) False
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Q: A 7.0 kg bowling ball moves at 2.20 m/s. How fast must a 2.00 g Ping-Pong ball move so that the two…
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A moving hammer drives a nail into the wood. It has kinetic energy.
a) True
b) False
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- 3. Which of the following statements correctly describes the relationship between an objects kinetic energy and its speed? a. E k is directly proportional to the speed of the object b. E k is directly proportional to the speed squared of the object c. E k is inversely proportional to the speed of the object d. E k is inversely proportional to the speed squared of the object e. none of the above describe the relationshipThe kinetic energy of a system must always be positive or zero. Explain whether this is true for the potential energy of a system.A 7.0 kg bowling ball moves at 2.35 m/s. How fast must a 2.20 g Ping-Pong ball move so that the two balls have the same kinetic energy? m/s
- 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?4. Identify a case where an object is moving over a surface with friction, but the frictional force does no work.1. An object with m = 2.6 kg is on top of a hill and is pressed against spring with k = 300 N/m. The spring is compressed by x = 0.55 m. The hill is 2.5 m high. The object is released and after the spring is decompressed it slides down the hill to the bottom. It does experience riction which does work of W = -92 J. At the bottom of the hill what is the object's kinetic nergy and what is its velocity? %3D %3D
- 1. An object of mass m, = 5.60 kg placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fastened to a hanging object of mass m2 = 9.50 kg as shown in the figure. How fast are the masses moving after m2 falls 1 m? Please use conservation of energy for this problem.1. A 23.0 kg child is playing on a swing with a length of 2.5 m. If the swing starts from rest and makes an angle of 40.0◦ with the vertical at the top of the swing, a) determine the child’s speed at the bottom of the swing neglecting friction. b) If the swing has a speed of 2.8 m/s at the bottom, determine the work done by friction during the downswing and, bonus) assuming the force of friction is constant, determine the maximum angle the swing attains on the upswing after passing through the bottom. Hint: Use the approximation that cos θ ≈ 1 − 1 2 θ 2 for angles given in radians.