Question

Darth Vader grabs an imperial soldier and lifts him off the floor. He holds the soldier suspended with Vader’s arm making an angle of 40° above the horizontal. If Vader’s arm is 1.2 m long and the soldier’s mass is 75 kg, what is the torque on Vader’s arm about his shoulder?

676 N m

734 N m

618 N m

565 N m

502 N m

A 1 kg mass is tied to a string and is being swung in a horizontal circle. The mass has a constant angular velocity of 0.3 rad/s. The string has a Young’s modulus of 10 X 10⁶ N/m², and the string’s original length is 0.7 m long. The radius of the string is 0.05 cm. How much does the string stretch? You can think of the string as being shaped like a long, thin cylinder.

3.2 mm

2.7 mm

5.6 mm

4.7 mm

3.8 mm

Answer 1