Buoyancy: A hollow steel ball of diameter 3.0 m just barely floats in water. What is the wall thickness of the ball? (?Fe = 7.87 g/cm3, ?water = 1.00 g/cm3)
A. 6.6 cm
B. 37 cm
C. 131 cm
D. 79 cm
Answer: A
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A bicycle wheel of radius 0.36 m and mass 3.2 kg is set spinning at 4.00 rev/s. A very light bolt is attached to extend the axle in length, and a string is attached to the axle at a distance of 0.10 m from the wheel
Initially the axle of the spinning wheel is horizontal, and the wheel is suspended only from the string. We can ignore the mass of the axle and spokes. At what rate will the wheel process about the vertical? A) 2.9 rpm B) 1.9 rpm C) 18 rpm D) 0.30 rpm E) 0.77 rpm
A series RLC circuit has resistance 200 
inductance 0.200 H, and capacitance 0.500
F If the circuit is at resonance with a 120 V rms source, what is the average power dissipated?
A. 144 W B. 120 W C. 77.0 W D. 72.0 W E. 100 W
A light-year is a unit of _____
A) time B) luminosity C) distance D) mass
Besides direct formation of a black hole in a hypernova, some think that mergers between neutron stars can create even longer-lived gamma ray bursts as well
Indicate whether the statement is true or false