The Sun's energy is generated from the fusion of
a. uranium to form lead, Pb.
b. helium nuclei to form carbon nuclei.
c. hydrogen nuclei to form helium nuclei.
d. carbon nuclei to form magnesium nuclei.
c
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Which phase of the Moon sets at noon?
A. waxing crescent B. full Moon C. third quarter D. new Moon E. None, the Moon always sets at sunrise.
Tasha has mass 20 kg and wants to use a 5.0-m board of mass 12 kg as a seesaw. Her friends are busy, so Tasha seesaws by herself by putting the support at the system's center of gravity when she sits on one end of the board. How far is she from the support point?
a. 1.9 m b. 0.94 m c. 4.1 m d. 3.1 m
State the law of signs for electric charges
The lid of a grand piano is propped open as shown. Which arrow most closely approximates the direction of the force that the hinge exerts on the lid? Assume that the prop exerts a force in parallel to the prop’s length. (Hint: Draw a torque diagram of the lid.)
A. A
B. B
C. C
D. D
E. E
F. F
T. T