A 20.0-kg cart slides down an inclined plane from a height of 3.0 m to the ground. Determine the change in the potential energy of the cart. Write your answer with the correct significant digits, correct sign (+ or - if non-zero) and correct unit.( Homework)
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A 20.0-kg cart slides down an inclined plane from a height of 3.0 m to the ground. Determine the change in the potential energy of the cart. Write your answer with the correct significant digits, correct sign (+ or - if non-zero) and correct unit.( Homework)
Write the expression for change in potential energy
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- A crate with a mass of 37.0 kg is pushed with a horizontal force of 150 N. The crate moves at a constant speed across a level, rough surface a distance of 5.95 m What is the work done (in J) by the 150 N force? J=? What is the coefficient of kinetic friction between the crate and the surface?Examples 3: Consider a block that is free to slide down a smooth, frictionless plane that is inclined at an angle 0 to the horizontal, as shown in Figure. If the height of the plane is h and the block is released from rest at the top, what will be its speed when it reaches the bottom?A child of mass m = 16 kg slides down a slide of height h = 2.7 m without friction. Let gravitational potential energy be zero at ground level. a)Write an expression for the child's total mechanical energy, E, at the top of the slide, in terms of the variables in the problem and the acceleration due to gravity g. b)Calculate the change in the child's potential energy, ΔU in joules, from the top to the bottom of the slide at ground level (i.e. ΔU = Uground - Utop). c)What is the child's final speed, vf in m/s?
- Several physical situations are described below. For each situation, simplify the work-energy equation by canceling any zero terms and any energy terms (whether KE or PE) which are unchanging. Explain each term which gets canceled. A Hot Wheels car starts from rest on top of an inclined plane and rolls down the incline through a loop and along a horizontal surface. Friction and air resistance have a significant effect on the car. Simplification of Work-Energy Equation KEi + PEi + Wnc = KEf + PEfThe car C and its contents have a weight of 520 lb, whereas block Bhas a weight of 230 lb. The car is released from rest. (Figure 1) Figure 1of1 > ▾ Part A Determine the car's speed when it travels 30 ft down the 20° incline Suggestion. To measure the gravitational potential energy, establish separate datums at the initial elevations of B and C. Express your answer to three significant figures and include the appropriate units. Value Submit Fequat Arawer < Return to Assignment Units Provide Feedback for Part A keyboard shortcuts for Part A help for Part Ahow much work is done by T1? express answer in joules
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