6. 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 gain in kinetic energy of the car and the hanging object A. 15 J B. 30 J C. 45 J D. 60 J please show complete solution
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6. 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 gain in kinetic energy of the car and the hanging object
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- pq.8bStarting from rest, a ball of mass 3 kg experiences a constant force of 12 N. What is the final kinetic energy (in J) of the ball after it has traveled a distance of 2 m? A. 6J B. 24) O C. 4J D.72) E. 36JA 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. OJ
- question 84. Two identical masses are suspended by strings wrapped around identical frictionless pulleys, except that a heavy metal ring has been added to one of the pulleys. The masses are released from rest and allowed to fall to the ground. How does the final kinetic energy of the falling mass compare between the two systems? Clearly explain your line of reasoning using physics concepts and equations. m mThree objects with masses m, = 6.6 kg, m, = 14 kg, and m3 = 16 kg, respectively, are attached by strings over frictionless pulleys as indicated in the fiqure below. The horizontal surface exerts a force of friction of 30 N on m,. If the system is released from rest, use energy concepts to find the speed of m, after it moves down 4.0 m. m/s m2 m1
- 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 ssfcPart A The cable of a crane is lifting a 950 kg girder. The girder increases its speed from 0.25 m/s to 0.75 m/s in a distance of 2.3 m. What is the girder's change in kinetic energy? Express your answer with the appropriate units. AK = Value Units %3D Submit Request AnswerA 62.6 kg runner has a speed of 5.30 m/s at one instant during a long-distance event. HINT What is the runner's kinetic energy at this instant (in J)? J (b) How much net work (in J) is required to triple his speed? J
- Sara used a sling shot to hunt a bird. She stretched the rubber band 5cm when she applied 2 N force. How much elastic potential energy is stored in the sling shot ? A. 0.05 J B. 0.075 J C. 0.45 J D. 0.25 JYou 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:…This question has multiple versions. Read carefully! A block is sliding to the right across a frictionless surface with an initial kinetic energy of 80J. An applied force acts on the block for a part of its journey, as described by the force- position graph provided. What is the final kinetic energy of the block? Neglect drag and friction. Right is defined as positive. A. 74) B. 77) C. 831 D. 86 Applied Force (N) 60 40 20 -20 -40 -60 A 0.1 Position (m) 0:2 0.3 0.4 0.5 0.6