A tuning fork has a frequency of 300 Hz and hence a period of 3.33 × 10^?3 s. If the tuning fork is in an inertial frame of reference moving by the observer at speed of 0.620 c, what is the frequency of the fork as measured by the observer? (Assume that measurements are strictly by optical means and that the speed of sound waves in air is not pertinent here)
a. 235 Hz
b. 382 Hz
c. 185 Hz
d. 185 Hz
e. 487 Hz
a
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An object is placed 50 cm in front of a concave mirror with a focal length of 25 cm. What is the magnification?
A) -0.50 B) -1.0 C) -1.5 D) -2.0 E) -2.5
Kepler's second law tells us that planets sweep out equal areas in equal times. If you compare the amount of area per time swept by Earth with the one of Jupiter, you would conclude:
A) They sweep the same area per time. B) They sweep different areas per time. C) Jupiter sweeps a larger area per time because it has much more mass than Earth. D) Earth sweeps a larger area per time because it has much less mass than Jupiter.
An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when the elastic potential energy of the system object-spring is a maximum?
A) at either A or B B) midway between A and B C) one-third of the way between A and B D) one-fourth of the way between A and B E) at none of the above points
You stand with your heels against a wall and bend ninety degrees forward at the waist.
A. You fall forward because your center of gravity moves ahead of your base of support. B. You fall forward because of the momentum you gain when you move. C. You fall forward because the muscles in your feet aren't strong enough to stop you. D. You are able to maintain your balance.