A 7.0 kg bowling ball moves at 2.00 m/s. How fast must a 2.40 g Ping-Pong ball move so that the two balls have the same kinetic energy?
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- A 5.0 kg box moves up a ramp with some initial speed. It reaches a vertical height of 3.0 m before momentarily coming to rest. If 100 J of thermal energy is created in the process. Use g = 10 m/s2. Match the answers with questions.Timmy is sat down in class, looking around the room. He notices a water bottle on a desk next to him and thinks to himself that since the water bottle is on the desk it must not have kinetic energy. Is he right yes, or no? Explain?An airplane of mass 4500 kg is cruising at a speed of 49.0 m/s at an altitude of 175 m. What is its total mechanical energy ? Show solution and choose from the choices below: 2.27 × 10^8 J 6.91 × 10^7 J 5.26 × 10^7 J 3.91 × 10^7 J 1.31 × 10^7 J
- A 1.0 kg cart is sliding to the right on a frictionless surface with speed 2 m/s. It collides head-on and sticks to a 0.5 kg cart that is sliding to the left with speed 4 m/s. What is the kinetic energy of the combined carts after the collision? (Hint: Make a table!) A.6 J B.0 J C.2 J D.4 JHow fast would a 30-kg kid need to run in order to have the same kinetic energy as an 8.0-g bullet fired at 400 m/s, in m/s? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.7. A 0.15 kg baseball is tossed horizontally from the top of a 27 m high cliff, and when it reaches the ground it lands with a velocity of 27 m/s. Use conservation of energy to find the initial velocity of the baseball (i.e. the speed at which it was tossed).
- An 11 kg object is flying at speed 4c/5. Calculate its kinetic energy, in units of kg c2.A 25 kg boy is swinging on a 2.5 m long chain. He swings up to a 50° angle. What is the final speed when the boy is at the bottom of his swing.At a carnival, you can try to ring a bell by striking a target with a 9.10-kg hammer. In response, a 0.410- kg metal piece is sent upward toward the bell, which is 5.05 m above. Suppose that 22.0% of the hammer's kinetic energy is used to do the work of sending the metal piece upward. How fast must the hammer be moving when it strikes the target so that the bell just barely rings?
- Calculate the kinetic energy of a 300 g baseball thrown at a velocity of 44 m/s. NAS 440 J 290 J 580 J 510 J 13.2 JA force of 16 N is applied to a 4.5 kg object (initially at rest) for a time of 5.6 s. What is the speed of the object afterwards? Assume a level, frictionless surface.A 0.500 kg bullet is fired from a gun at 25.0 m/s, how much kinetic energy does it have? 156.3 156.25 J 156 J 156.3 m