4. A spring has a spring constant, k = 10000 N/m. How much potential energy is stored in the spring if it is stretched 1 cm

7. A 60 Kg woman is attached to a bungee cord with an unstretched length of 12m. She jumps off a tower; from a height of 70 m. When she finally stops, the cord has a stretched length of 37m. Assuming the spring constant of the bungee cord is 69.8 N/m, what is the total potential energy relative to the ground when the woman stops falling?

A spring of negligible mass has force constant k = 1600 N/m. How far must the spring be compressed for 3.20 j of potential energy to be stored in it? 7) %3D a) b) The spring is placed vertically with one end on the floor. A 1.0-kg book is the droped from a height of 0.80 m above the top of the spring. Find the maximum distance the spring will be compressed. 1.0 kg h = 0.8 m

1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?

A 3 kg block is held 3 meters above the free end of a relaxed massless vertical spring. The block is dropped from rest so that it falls vertically onto the spring and compresses it by a distance of 0.2 meters. Use energy conservation to find the spring constant. A.) 7412 N/m B.) 4704 N/m C.) 9725 N/m D.) 3128 N/m

6. A spring stores 68 J of potential energy when it is stretched by 6 cm. What is the spring constant?

QUESTION 9 When a spring is compressed or stretched, the elastic potential energy (U=1/2kx²) of the spring: Oa. Stays constant Ob. Decreases Oc Increases Od. Either positive or negative

The spring constant of a spring is 100 N/m. A force of 10 N stretches the spring by 10 cm. How much potential energy is stored in the spring? а. О.3] b. 0.2J c. 0.4J d. 0.5J

2. A gymnast with a mass of 60.0 kg is jumping on a trampoline. The effective spring constant of the trampoline is 2000. N/m. If the gymnast compresses the trampoline a distance of 0.45 m and reaches a height of 1.2 m above the surface of the trampoline, a) determine how much work the gymnast does during the jump. If the jump takes 0.50 s, b) determine the power output of the gymnast.

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