A light spring has unstressed length of 15.1 cm. It is described by Hooke's law with spring constant 4.39 N/m. One end of the horizontal spring is held on a fixed vertical axle, and the other end is attached to a puck of mass m that can move without friction over a horizontal surface. The puck is set into motion in a circle with a period of 1.38 s. a. Find and expression for the extension of the spring x as it depends on m.
b. Evaluate x for m = 0.075 kg
c. Evaluate x for m = 0.150 kg
d. Evaluate x for m = 0.225 kg.
e. Describe the pattern of variation of x as it depends on m.

b.

explanation:

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

pecialized keyboards

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j