What is the apparent path of the Sun against the background of stars?
a. ecliptic
b. zenith
c. nadir
d. elliptic
e. shadow
a
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What is the intensity of the electromagnetic radiation at a distance of 2.00 m from a 100 W isotropic source?
a. 
b. 
c. 
d. 
e. 
Power: A sand mover at a quarry lifts 2000 kg of sand per minute a vertical distance of 12 m. The sand is initially at rest and is discharged at the top of the sand mover with speed 5.0 m/s into a loading chute. What minimum power must be supplied to this machine?
A. 520 W B. 3.9 kW C. 6.7 kW D. 4.3 kW E. 1.1 kW
Which of the following is an inherent disadvantage of radio telescopes?
A. Radio telescopes cannot detect visible light. B. They only work at night. C. Radio telescopes have low magnification. D. Radio signals are very weak, and their photons do not penetrate the atmosphere easily. E. The long wavelength of radio waves results in lower resolving power, compared to other telescopes of the same size.
If a microscopic particle's uncertainty in velocity is reduced,
A) its uncertainty in position must decrease enough to satisfy the uncertainty principle. B) its uncertainty in position must remain unchanged. C) its uncertainty in position must increase enough to satisfy the uncertainty principle.