Which of the beams is due to a high energy electron?
A) a
B) b
C) c
D) all of the above
E) none of the above
Answer: A
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A cylinder of weight W1 5 150 lb is supported at two points, 1 and 2, as shown. Neglect friction at the two points of contact. Normal forces N1 and N2 are (in lb):
(A) 75, 130
(B) 130, 75
(C) 125, 150
(D) 75, 120
What is the difference in meaning between the terms weather and climate?
A) Weather refers to local conditions, and climate refers to global conditions. B) Weather refers to short-term variations in conditions, and climate refers to long-term variations in conditions. C) Weather refers to small storms, and climate refers to large storms. D) Weather refers to wind and rain, and climate refers to processes like convection. E) There is no difference between weather and climate.
If work is done on a system by non-conservative forces, the total mechanical energy of a system stays constant
Indicate whether the statement is true or false
When we drink through a straw, the liquid is actually
1) pulled up 2) sucked up 3) pushed up by 4) atmospheric pressure. 5) reduced pressure in the straw. 6) surface tension. 7) capillarity.