The drawing shown is supposed to be a free-body diagram of a crate that is being lowered by a crane and is speeding up as it is being lowered. Is the diagram correct? (Ignore air resistance.)
A. Yes.
B. No, 
should be labeled 
C. No, 
should be equal to 
.
D. No, 
should be greater than 
E. No, there should be an upward drag force 
F. No, there is some other problem (specify).
A. Yes.
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The radiation emitted from a star has a maximum intensity at a wavelength of 300 nm. What is the temperature of this star?
a. 300 K b. 100 K c. 900,000,000 K d. 90,000 K e. 10,000 K
Energy and Momentum: An egg falls from a bird's nest in a tree and feels no effects due to the air. As it falls,
A. only its kinetic energy is conserved. B. only its momentum is conserved. C. both its kinetic energy and its momentum are conserved. D. only its mechanical energy is conserved. E. both its mechanical energy and its momentum are conserved.
Based on the graph above, a planet with twice the mass of Jupiter would have a radius that is
A) about twice the radius of Jupiter. B) about 5% larger than the radius of Jupiter. C) about half the radius of Jupiter. D) about 10% smaller than the radius of Jupiter.
Isolated quarks were first observed in
A. 1938. B. 1955. C. 1976. D. 2001. E. Isolated quarks have not been observed.