A student constructs an astronomical telescope with a magnification of 10. If the telescope has a converging lens of focal length 50 cm, what is the resulting length of the telescope?
A)
53 cm
B)
55 cm
C)
60 cm
D)
67 cm
E)
75 cm
B
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Two cranes are lifting identical steel beams at the same time. One crane is putting out twice as much power as the other. Assuming friction is negligible, what can you conclude is happening to explain this difference?
a) The crane with double the power must be lifting its beam four times as fast. b) The crane with double the power must be lifting its beam twice as fast. c) The crane with double the power must be lifting its beam twice as slowly. d) The crane with double the power must be lifting its beam four times as slowly.
The electron was discovered in 1897 by the English physicist J. J. Thomson
Indicate whether the statement is true or false
The total linear momentum of an isolated system of masses remains the same if there are no external ______________ acting on the system
a. forces b. torques c. unbalanced forces d. unbalanced torques
In a series RLC circuit an inductor will be dominant at higher frequencies
Indicate whether the statement is true or false