A 30. N stone is dropped from a height of 10. m, and strikes the ground with a velocity of 13. m/s. What average force of air friction acts on it as it falls?
A) 7.2 N
B) 2.9 N
C) 1.2 N
D) 4.1 N
E) 0.13 KN
D
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Which of the following reactions is the second reaction in the proton-proton chain?
A) 1H + 1H ? 2H + e+ + ? B) 2H + 2H ? 4He + e+ + ? C) 2H + 1H ? 3He + ? D) 3He + 3He ? 4He + 1H + 1H
Dimensional Analysis: When multiplying several quantities
A. the quantities can have any combination of units. B. the quantities must all have exactly the same units. C. the quantities must all be dimensionless.
An L-shaped beam is loaded as shown in the figure. The bending moment at the midpoint of span AB is approximately:
(A) 6.8 kN?m
(B) 10.1 kN?m
(C) 12.3 kN?m
(D) 15.5 kN?m
Studying the chromosphere and corona: Consider observations of the solar chromosphere and corona
What are the principle difficulties in observing them in X-ray, ultraviolet, and in visible light? What could be done to circumvent those difficulties?