A 1.37-kg block is held in place against the spring by a 74-N horizontal external force (see the figure)

The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s upon separation from the spring. The block descends a ramp and has a velocity at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction over this section is 0.24. The velocity of the block is at C. The block moves on to D, where it stops. The initial compression of the spring is closest to

A) 2.7 cm.
B) 1.4 cm.
C) 0.96 cm.
D) 5.3 cm.
E) 3.6 cm.


Answer: A

Physics & Space Science

You might also like to view...

Any model of solar system formation must explain why terrestrial planets and jovian planets formed differently

Indicate whether the statement is true or false

Physics & Space Science

You listen to a live orchestra concert from a cheap seat far away, high up in the balcony. The music seems to be a little out of sync with the conductor's beat. Why?

a. The musicians are paying no attention to the conductor. b. You are noticing a time lag due to the finite speed of sound. c. The orchestra is not very good. d. The viola section is dragging.

Physics & Space Science

Which one of the following lists gives the correct order of the electromagnetic spectrum from low to high frequencies?

A) radio waves, infrared, microwaves, ultraviolet, visible, x-rays, gamma rays B) radio waves, ultraviolet, x-rays, microwaves, infrared, visible, gamma rays C) radio waves, microwaves, infrared, visible, ultraviolet, x-rays, gamma rays D) radio waves, microwaves, visible, x-rays, infrared, ultraviolet, gamma rays E) radio waves, infrared, x-rays, microwaves, ultraviolet, visible, gamma rays

Physics & Space Science

Springs: A heavy dart and a light dart are launched horizontally on a frictionless table by identical ideal springs. Both springs were initially compressed by the same amount. Which of the following statements about these darts are correct? (There could be more than one correct choice.)

A. The darts both have the same kinetic energy just as they move free of the spring. B. The lighter dart leaves the spring moving faster than the heavy dart. C. The heavy dart had more initial elastic potential energy than the light dart. D. Both darts move free of the spring with the same speed. E. Both darts had the same initial elastic potential energy.

Physics & Space Science