A 0.150-m-radius grinding wheel starts at rest and develops an angular speed of 12.00 rad/s in 7.80 s. What is the average tangential acceleration of a point on the wheel's edge?
a. 0.231 m/s2
b. 1.54 m/s2
c. 10.3 m/s2
d. 14.0 m/s2
a
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Two harmonic sound waves reach an observer simultaneously. The observer hears the sound intensity rise and fall with a time of 0.200 s between the maximum intensity and the succeeding minimum intensity
What is the difference in frequency of the two sound waves? A) 10.0 Hz B) 0.200 Hz C) 5.00 Hz D) 2.50 Hz E) 1.25 Hz
On which planet (other than Earth) have air bags been deployed?
a. Venus b. Mars c. Mercury d. Saturn
A spaceship enters the solar system moving toward the Sun at a constant speed relative to the Sun
By its own clock, the time elapsed between the time it crosses the orbit of Jupiter and the time it crosses the orbit of Mars is 50.0 minutes. How fast is the spaceship traveling towards the Sun? The radius of the orbit of Jupiter is 778 × 109 m, and that of the orbit of Mars is 228 × 109 m. A) 0.319c B) 0.438c C) 0.522c D) 0.671c E) 0.982c
A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?
A) It goes up. B) It goes down. C) It does not change. D) It cannot be determined without knowing the volumes of the two pieces of wood.