The angle that a swinging simple pendulum makes with the vertical obeys the equation
?(t) = (0.150 rad) cos[(2.85 rad/s)t + 1.66].
(a) What is the length of the pendulum?
A) 0.15 m
B) 0.83 m
C) 1.21 m
D) 2.02 m
E) It cannot be determined from the information given.
(b) What is the mass of the swinging bob at the end of the pendulum?
A) 2.85 kg
B) 1.66 kg
C) 0.454 kg
D) 0.150 kg
E) It cannot be determined from the information given.
(a) C (b) E
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Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope b. the VLBA telescope c. an X-ray telescope d. a radio telescope e. None of the other choices are correct.
Energy in Nuclear Reactions: Consider the nuclear reaction 
N + 
He ? 
O + 
H. The known atomic masses are
N: 14.003074 u
/>He: 4.002603 u
H: 1.007825 u
O: 16.999131 uWhat is the Q-value (or reaction energy) of this reaction? (1 u = 931.5 MeV/c2)
A. -1.191 MeV
B. -2.020 MeV
C. -6.725 MeV
D. -9.055 MeV
A starship "Alpha" travels at 0.8c past an identical starship, "Beta," which is at rest. Both an engineer on the "Alpha" and a scientist on the "Beta" measure the length of the other ship as it passes by. Who measures the longer length?
A. The scientist B. Both measure the same length C. The engineer D. The measured lengths cannot be compared
Starting from one oasis, a camel walks 25 km in a direction 30° south of west and then walks 30 km toward the north to a second oasis. What distance separates the two oases?
a. 15 km b. 48 km c. 28 km d. 53 km e. 55 km