Question

1. Pushing on the pump of a bottle of hand washing solution compresses a small spring which obeys Hooke's Law. If the potential energy of the spring is 0.0030 J when the spring is compressed 0.49 cm,determine the following.

(a)

the force constant (in kN/m) of the spring

kN/m

(b)

the compression (in cm) needed in order for the spring potential energy to equal 0.0083 J

cm

2. You have a light spring which obeys Hooke's law. This spring stretches 2.54 cm vertically when a 2.40 kg object is suspended from it. Determine the following.

(a)

the force constant of the spring (in N/m)

N/m

(b)

the distance (in cm) the spring stretches if you replace the 2.40 kg object with a 1.20 kg object

cm

(c)

the amount of work (in J) an external agent must do to stretch the spring 7.40 cm from its unstretched position

J

Answer 1