How does the force of friction for a sliding object vary with speed?
a. The force of friction is inversely proportional to speed.
b. The force of friction is approximately independent of speed.
c. The force of friction is proportional to speed.
d. The force of friction is zero for a sliding object.
Answer: b. The force of friction is approximately independent of speed.
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Discuss the role that methane plays in the appearances of Neptune and Uranus
What will be an ideal response?
When can radio telescope be used?
What will be an ideal response?
A sound source of frequency 1000 Hz moves at 40.0 m/s toward a listener who is at rest. What is the apparent frequency heard by the listener? (speed of sound = 340 m/s)
a. 853 Hz c. 1130 Hz b. 872 Hz d. 1170 Hz