A mass is suspended from a string in an airplane. As the plane is in the process of taking off, it is found that the string, instead of being vertical, hangs at an angle of 13° from the vertical. What is the acceleration of the plane at this time?
a. 2.3 m/s2
c. 9.1 m/s2
b. 3.8 m/s2
d. 3.5 m/s2
A
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According to Einstein's theory of relativity, the universe is made of
A) matter and anti-matter. B) radiation. C) energy. D) popcorn. E) matter.
Seal level is rising from global warming. The main cause is
A. expanding sea water B. melting glaciers C. expanding rock under the sea D. contracting earth (while the water stays constant)
A 0.10g flea, having lept from the surface of a dog’s cranium, is observed to be moving at 1.25m/s when it is 5.00cm above the position from which it leapt. What was the elastic potential energy stored in its legs before its leap?
a. 
b. 
c. 
d. 
e. 
f. 
Monochromatic light of wavelength 500 nm is incident normally on a grating. If the third-order maximum of the diffraction pattern is observed at 32.0°, what is the total number of maxima can be seen?
A) 5 B) 7 C) 10 D) 11 E) 8