Author Question: An unusual spring has a restoring force of magnitude F = (2.0 N/m) x + (1.0 N/m2)x2, where x is the ... (Read 56 times)

acc299 · **on:** Jul 29, 2018

An unusual spring has a restoring force of magnitude F = (2.0 N/m) x + (1.0 N/m2)x2, where x is the stretch of the spring from its equilibrium length.

A 3.00 kg mass is attached to this spring and released from rest after stretching the spring 2.00 m. What is the speed of the mass when the spring returns to its equilibrium length?
A)

3.27 m/s

B)

5.48 m/s

C)

4.33 m/s

D)

7.41 m/s

E)

2.11 m/s

Question 2

A person stands 35.0 m from a flag pole. With a protractor at eye level, he finds that the angle at the top of the flag pole makes with the horizontal is 25.0 degrees.

Approximately how high is the flag pole? (The distance from his feet to his eyes is 1.7 m.) A)

10 m

B)

20 m

C)

30 m

D)

50 m

E)

80 m