The look-back time to nearby galaxies is only a few million years, but the look-back time to more distant galaxies is a large fraction of the age of the Universe
Indicate whether the statement is true or false
True
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For this problem, assume that the acceleration of gravity is 10 m/s2 downward, and that all friction effects can be neglected. A ball is thrown upward at a velocity of 20 m/s. What is its velocity after 3 s?
A) zero B) 10 m/s upward C) 10 m/s downward D) 20 m/s downward E) 20 m/s upward
Estimate the number of times Earth will rotate on its axis during a human's lifetime
A) 3 × 104 B) 3 × 105 C) 3 × 106 D) 3 × 107 E) 3 x 108
The potential difference between the plates of a parallel plate capacitor is 4.00 V. If the plate separation for this capacitor is 6.00 cm, what is the intensity of the electric field between the plates of this capacitor?
What will be an ideal response?
Two loudspeakers are placed facing each other and driven by the same source at 680 Hz. A listener is positioned between the two speakers on the line separating them, thus creating a constructive interference at the listener's ear. If one of the speakers is gradually pushed toward the listener, how far must it be moved to repeat the condition of constructive interference at the listener's ear?
(The speed of sound = 340 m/s.) a. 0.13 m c. 0.50 m b. 0.25 m d. 1.00 m