P4 The 50 kg-mass box is pulled up slowly on a 5 m high inclined plane from its bottom to its top. During this motion, 4.1 kJ work was done by us. The pulling force is parallel to the surface of the inclined plane. After we reach the top of the inclined plane, we release the box. What is the speed of the box when it reaches the bottom of the inclined plane? Neglect air drag.
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- I need the answer as soon as possibleWhat is the change in gravitational potential energy for a 70 kg man walking up stairs from a height of 64 m to 108 m? a. -30215J b. 30215 J c. -30130 J d. 30130 J PROBLEM 6.3 2.Can work ever be negative? Group of answer choices Yes. If the force and displacement have opposite directions. Yes. If the force and displacement have the same direction. No. Work is energy, which is inherently positive. No. Work is a scalar quantity, so must always be positive
- 1.At an amusement park, a swimmer uses a water slide to enter the main pool. If the swimmer starts at rest, slides without friction, and descends through a vertical height of 2.31 m, what is her speed at the bottom of the slide?Draw and Explain.A 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. OJa. Does a car’s kinetic energy change more when the car speeds up from 11 to 18 m/s or from 16 to 23 m/s? Explain. b. A stone cube is pressed against an uncompressed spring (length = 6.80 m) until it is fully compressed (length = 0.70 m), the stone cube is exactly at the bottom of an incline of slope 35.0°. Upon released, the spring projects the stone cube up the incline. Right when the stone cube is no longer in contact with the spring, it is moving up the incline at 8.70 m/s. The mass of the stone cube is 2.10 kg and the mass of the spring is negligible. Given that the μk between the stone cube and the surface of the incline is = 0.46. Calculate the amount of potential energy that was initially stored in the spring.
- Stopping distance. A car is traveling on a horizontal road with speed v_0=13.9 m/s at the instant the brakes are locked, so the tires are sliding instead of rolling. Use the work-energy theorem to calculate the minimum distance the car can stop if the coefficient of kinetic friction \mu_k=0.7 between the tires and the road. B: A: 12 m 16 m C: 17.5 m D: 14 m. E: 23.7 mFor its size, the common flea is one of the most accomplished jumpers in the animal world. A 2.10-mmmm-long, 0.470 mgmg flea can reach a height of 20.0 cmcm in a single leap. Part A Ignoring air drag, what is the takeoff speed of such a flea? Express your answer in meters per second. Part B Calculate the kinetic energy of this flea at takeoff. Express your answer in joules. Part C Calculate the kinetic energy per kilogram of mass. Express your answer in joules per kilogram. If a 77.0 kgkg, 2.00-mm-tall human could jump to the same height compared with his length as the flea jumps compared with its length, how high could the human jump? Express your answer in meters. If a 77.0 kgkg, 2.00-mm-tall human could jump to the same height compared with his length as the flea jumps compared with its length, what takeoff speed would the person need? Express your answer in meters per second. Most humans can jump no more than 60.0 cmcm from a crouched…c) Eddy and his skateboard with mass a of 65 kg ride on a rough horizontal road as shown in Figure 3. At the bottom of an incline, his velocity is 4 m s1. He rides up the incline and reaches the top with a velocity of 1 m s. The difference in height between the top and the bottom of the incline is 0.6 m. 1 m/s 4 m/s 0.6 m Figure 3 Calculate: i. the total energy of Eddy before he rides on the inclined plane, ii. the total energy of Eddy after the rode up the inclined plane, and ii. the net energy loss due to the friction on the inclined plane. (5 marks)
- W6 2A crate with mass m = 33.3 kg being pushed up an incline that makes an angle φ = 22.7 degrees with horizontal. The pushing force is horizontal, with magnitude P, and the coefficient of kinetic friction between the crate and the incline is μ = 0.358. Consider the work done on the crate as it moves a distance d = 5.32 m at constant speed. a. What is work done by the pushing force, in joules? b. What is the work done by friction, in joules? c. What is the work done by gravity, in joules? d. What is the net work, in joules?a. Calculate the work done (in J) on a 1550 kg elevator car by its cable to lift it 39.5 m at constant speed, assuming friction averages 135 N. b. What is the work done (in J) on the lift by the gravitational force in this process? c. What is the total work done (in J) on the lift?