A turntable has a moment of inertia of 3.00 × 10^?2 kg·m2 and spins freely on a frictionless bearing at 25.0 rev/min. A 0.600-kg ball of putty is dropped vertically on the turntable and sticks at a point 0.100 m from the center. By what factor does the angular momentum of the system change after the putty is dropped onto the turntable?
a. 1.22 b. 1.00 (no change)
c. 0.820 d. 1.20
b
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Frame dragging is a complex consequence of general relativity. It can be simplified into a classical analog, however, demonstrated by which of the following situations?
A camper carries her drinks in an ice chest made of styrofoam. The chest is 40 cm × 45 cm × 70 cm, and the walls and lid are 2.5 cm thick
The contents of the chest are ice, water, cans of soft drinks, and other food, all of which are in thermal equilibrium with the ice water. The temperature just outside the ice chest is 35°C. What is the rate of heat flow through the walls of the box? The thermal conductivity of styrofoam is 0.010 W/(m•K). A) 14 W B) 16 W C) 18 W D) 20 W E) 22 W
A person approaches a plane mirror at a speed of 2 m/s. How fast does he approach his image?
A) 1 m/s B) 2 m/s C) 3 m/s D) 4 m/s E) 1 m/s
Muons at speed 0.9994c are sent round and round a circular storage ring of radius 1500 m. If a muon at rest decays into other particles after an average T = 2.2 × 10^-6 s, how many trips around the storage ring do we expect the 0.9994c muons to make before they decay?
a. 2 c. 0.2 b. 4 d. 6