While the gondola is rising at a speed of 2.0 m/s, a passenger in a balloon-supported gondola throws a small ball down at a speed of 5.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up.
b. 3.0 m/s, down.
c. 3.0 m/s, up.
d. 5.0 m/s, down.
e. 12.8 m/s, down.
b
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Doubling both charges changes the potential energy for a pair of point charges by a factor of
A. 2. B. 4. C. 1?2. D. 1?4. E. 1 (no change).
Your radio is tuned to 98 on the FM dial. What electromagnetic wave frequency is your radio receiving, and how fast is this wave traveling?
A) 98 × 106 Hz, at the speed of sound B) 98,000 Hz, at the speed of sound C) 98 Hz, at a speed of 300,000 km/s D) 98,000 Hz, at a speed of 300,000 km/s E) 98 × 106 Hz, at a speed of 300,000 km/s
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What will be an ideal response?
A 0.600-kg piece of metal X is heated to 100°C and placed in an aluminum can of mass 0.200-kg which contains 0.500 kg of water initially at 17.3°C. The final equilibrium temperature of the mixture is 20.2°C,
what is the specific heat of metal X? The specific heats of water and aluminum are 4186 J/kg ? K (water) and 910 J/kg ? K (aluminum). A) 140 J/kg ? K B) 270 J/kg ? K C) 450 J/kg ? K D) 900 J/kg ? K