40-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 200 J from 420 J. How high does she rise during this interval? Neglect air resistance.
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- A 44-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 180 J from 450 J. How high does she rise during this interval? Neglect air resistance.A pogo stick has a spring with a force constant of 2.50 x 10^4 cm, which can be compressed 10.4cm. What is the maximum height in meters above the compressed position of the spring, can a child jump with the stick using only the maximum elastic potential energy in the spring, if the child and stick have a combined mass of 35 kg?A 35-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 200 J from 420 J. How high does she rise during this interval? Neglect air resistance.
- A 2.0 kg block is pressed up against a spring (k = 44 N/m) that is attached to a wall as shown. The block is held so that there is 1.2 J stored in the spring and then the block is released from rest. If there is no friction, what is the speed of the block when the energy stored in the spring is 0.0 J?A 0.60-kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 5.0 N for a distance of 5.0 m. How much farther would the force have to act for the block to have 64 J of kinetic energy?A 0.45 kg box approaches the ramp at an unknown velocity. It travels up the 0.04 meters high ramp and compresses a spring (with spring constant, k = 55 N/m) a distance of 0.05 m. How fast was the box originally traveling? Ignore friction and air resistance.
- 86. Consider a particle on which several forces act, one of which is known to be constant in time: F₁ = (3N)Î + (4N)Ĵ. As a result, the particle moves first along the x-axis from x = 0 to x = 5 m and then parallel to the y-axis from y = 0 to y = 6 m. What is the work done by F?75 PhysicsA 0.5 kg ball experiences the one-dimensional, conservative force Fx as shown in Figure 1. The corresponding potential energy versus x is is shown in Figure 2. No friction involves throughout the path. The ball has a total energy of 60.0 J and the zero potential reference is at x = 0 m. [Answer in 3 significant figures] F, versus x 30 25 20 15 10 0. -5 0 2. 4 5 -6- 8 - 6. 10 -10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 x (m) Figure 1 Conservative force versus position Potential energy versus X 1. 1. 1. 3. (N) *)