A 10 kg solid cylinder (I = 1/2 
with a radius of 30.0 cm is rotating about a vertical axis through its center. If the angular momentum is increasing at the rate of 25.0 kg 
then what is the angular acceleration?
A. 75.3 
B. 65.9
C. 55.6
D. 40.5
E. 35.2
C. 55.6
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An electron is released from rest at the negative plate of a parallel plate capacitor. If the distance between the plates is 5 mm and the potential difference across the plates is 5 V, with what velocity does the electron hit the positive plate? (me = 9.1 × 10^?31 kg, qe = 1.6 × 10^?19 C.)
Estimate the rate at which heat needs to be supplied to an astronaut repairing the Hubble telescope in space. Assume that the emissivity of the spacesuit is 0.5. Describe your model with a simple sketch and clearly state your assumptions.
GIVEN
• An astronaut repairing the Hubble telescope in space.
• Emissivity of spacesuit (?) = 0.5
FIND
• Rate at which heat needs to be supplied to the astronaut.
ASSUMPTIONS
• The spacesuit is idealized as a cylindrical object of height 1.8 m and diameter of 0.4 m.
• Temperature of 370C is maintained inside the suit.
SKETCH
Energy in the Electric Field: A 25.0-V potential source (a battery) is connected across the plates of a 6.66-µF air-filled parallel-plate capacitor having plates that are 1.22 mm apart. What energy density does it produce between the plates? (?0 = 8.85 × 10-12 C2/N ? m2)
Fill in the blank(s) with the appropriate word(s).