Assume that the average mass of each of the approximately 1 billion people in China is 55 kg. Assume that they all gather in one place and climb to the top of 2-m-high ladders. The center of mass of the Earth (mE = 5.90 1024 kg) is then displaced
a. 0 m.
b. 1.84 × 10^?23 m.
c. 1.84 × 10^?14 m.
d. 1.80 × 10^?13 m.
e. 2 m.
c
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Our galaxy is suspected to be surrounded by a galactic halo or corona because the disk of the galaxy
a. rotates faster than expected in its outer region. b. rotates more slowly than expected in its outer region. c. is only visible during a total eclipse of our sun d. is surrounded above, below and well beyond by the brightly glowing corona.
Single-Slit Diffraction: A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength of the illuminating light is doubled?
A. It will be cut to one-quarter its original size. B. It will be cut in half. C. It will double. D. It will become four times as large. E. It will become eight times as large.
An athlete competing in long jump leaves the ground with a speed of 9.14 m/s at an angle of 35.0° above the horizontal. How long does the athlete stay in the air?
A) 0.501 s B) 0.876 s C) 1.07 s D) 2.53 s E) 0.535 s
The natural radioactivity in a typical human body is closest to
A. 0.2 per hour B. 12 per hour C. 12 per minute D. 4000 per second