According to Kepler, the paths of planets about the Sun are
A) parabolas.
B) circles.
C) straight lines.
D) ellipses.
E) none of the above
Answer: D
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Two piano strings are simultaneously played – their mass and length are identical, but the tensions differ. If the first string resonates with a fundamental frequency of 330 Hz, and its tension is 1.2% greater than that of the second string, what is the fundamental frequency of the second string?
A. 328 Hz B. 326 Hz C. 336 Hz D. 334 Hz
Light bulb A is rated at 60 W and light bulb B is rated at 100 W. Both are designed to operate at 110 V. Which statement is correct?
a. The 60 W bulb has a greater resistance and greater current than the 100 W bulb. b. The 60 W bulb has a greater resistance and smaller current than the 100 W bulb. c. The 60 W bulb has a smaller resistance and smaller current than the 100 W bulb. d. The 60 W bulb has a smaller resistance and greater current than the 100 W bulb. e. We need to know the resistivities of the filaments to answer this question.
Maggie drops a stuffed bear over the side of her crib. It hits the floor with speed v and comes to rest. She then drops a rubber ball with the same mass from the same height, and it bounces back upwards with speed v. Compare the change in momentum of the bear and the ball.
A. ?pbear = ?pball B. ?pbear = 2 ?pball C. ?pbear = ½ ?pball D. ?pbear = - ?pball
During Spring Tides the high tides are higher
Answer the following statement(s) true (T) or false (F)