In Figure 4.2, the blocks and rod assembly move upward at constant velocity. The force in link A is closest to:
A) 39 N
B) 41 N
C) 43 N
D) 45 N
E) 47 N
D
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The net force required to move a body at a constant velocity in outer space is ________
a. zero b. its weight c. the force of gravity d. its mass times its velocity e. the force of friction
Why do we see a gravitational redshift in the spectrum of the Sun?
A) Time runs slower on the Sun than on Earth, making lines in the solar spectrum have lower frequency and hence longer wavelength than normal. B) Gravity makes light heavy, causing it to appear redder. C) Because of gravity, the Sun is always moving away from us so we see a redshift. D) Spacetime curvature allows red photons of light to escape the Sun more easily than blue photons, leading to an apparent redshift.
If the current in the 4.0-? resistor is 1.4 A, what is the magnitude of the potential difference, VA ? VB?
a.
69 V
b.
55 V
c.
62 V
d.
48 V
e.
31 V
Constant Angular Acceleration: A bicycle wheel has an initial angular speed of 7.2 rad/s. After turning through one-half of a revolution, the angular speed is reduced to 2.2 rad/s. If the angular acceleration of the wheel was constant during the motion, how long will it take the wheel to make the one-half revolution?
Fill in the blank(s) with the appropriate word(s).