Which of the following is an example of convection?
a. Heat radiates from a planet into space.
b. Heat travels from atom to atom, from inside a planet to the outside.
c. Hot material inside a planet rises, and cool material sinks toward the center.
d. Metal conducts energy throughout Earth's core.
Answer : c. Hot material inside a planet rises, and cool material sinks toward the center.
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When Jeff ran up a hill at 7.0 m/s, the horizontal component of his velocity vector was 5.1 m/s. What was the vertical component of Jeff's velocity?
A) 4.8 m/s B) 4.3 m/s C) 3.8 m/s D) 3.4 m/s
A series LC circuit contains a 100 mH inductor, a 36.0 mF capacitor and a 12 V battery. The angular frequency of the electromagnetic oscillations in the circuit is
a. 36.0 × 10^?4 rad/s. b. 6.00 × 10^?2 rad/s. c. 2.78 rad/s. d. 16.7 rad/s. e. 277 rad/s.
When performing arithmetical operations using significant figures, how many significant digits can there be in a final answer that is obtained by multiplying or dividing the original recorded data?
When a 60 Hz sinusoidal voltage is applied to the input of a half-wave rectifier, the output frequency is
a. 30 Hz. b. 60 Hz. c. 120 Hz. d. 90 Hz.