2. A 10.0 kg block is pushed against a horizontal spring that has a spring constant of 15.0 N/m. If the spring is displaced 0.0500 m, find the speed of the block after it is released from the spring.

1. A 12.0 kg block is released from rest on a 30.00 rough incline. The kinetic coefficient of friction is Hk = 0.100. Below the block is a spring that can be compressed 3.00 cm by a force of 2.50x10- N. The kinetic energy of the block just before it hits the spring is 2.50x102 J. a) Draw a free body diagram while the block is compressing the spring. b) What is the kinetic frictional force? c) By how much is the spring compressed when the block momentarily stops? 12 kg 30

1. A spring gun (spring constant k=100 N/m) is used to shoot a 5 g ball vertically up. The ball leaves the gun with speed 10m/s. a) What was the compression of the spring? b) What is the maximum height of the ball above the release point?

A crane lifts a 268 kg crate a height of 12.4 m in a time of 80.0 s at a constant speed. What is the crane's power? Select one: 41.5 W Ob. 4.08 x 102 W O c. 3.32 x 10³ W O d. 3.26 x 104 W a. The time required for one complete oscillation of a vibrating object is called

An automobile having a mass of 1000 kg is driven into a brick wall in a safety test. The bumper behaves like a spring with constant 4.75  106 N/m and is compressed 2.70 cm as the car is brought to rest. What was the speed of the car before impact, assuming no energy is lost in the collision with the wall? m/s

A spring of spring constantk 625 N/m rests on a horizontal frictionless surface. A 0.25 kg object compressed the spring by 0.3 m. If the mass is released from rest, what is the speed of the mass as it passes through the equilibrium point (in m/s)? 10 wwww.m а. b. 15 с. 20 d. 25 .1 O 2 O d. 30

A 2.6kg box is sliding along a frictionless horizontal surface with a speed of 1.8m/s when it encounters a spring.  A. Determine the force constant of the spring if the box compresses the spring 7.50cm before coming to rest. B. Determine the initial speed the box would need to be in order to compress the spring by 1.30cm

A 2.8 kg box is sliding along a frictionless horizontal surface with a speed of 1.8 m/s when it encounters a spring, (a) Determine the force constant (in N/m) of the spring, if the box compresses the spring 7.5 cm before coming to rest. N/m (b) Determine the initial speed (in m/s) the box would need in order to compress the spring by 1.4 cm. m/s Additional Materials

9. A 7.9 kg object is suspended 10 m above the ground. Directly beneath it is a spring with a spring constant of 6500 N/m. Qualitatively describe what occurs to the energy of the system once the object is released? (Hint: Consider what occurs as the object falls, encounters the spring, and if it will go back up again!)