If the units of your answer are kg ? m2/s3, which of the following types of quantities could your answer be? (There could be more than one correct choice.)
A) kinetic energy
B) force
C) power
D) work
E) potential energy
C
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Ultraviolet radiation from a star:
A) gets almost completely absorbed before it reaches Earth's surface. B) has a wavelength that is longer than the visible light emitted by the star. C) has a wavelength that is shorter than the X-rays emitted by the star. D) reaches most of Earth's surface through atmospheric windows.
200 J of work is done in compressing a gas adiabatically. What is the change in internal energy of the gas?
A) zero B) 100 J C) 150 J D) 200 J E) There is not enough information to determine.
The windings of a motor have a resistance of 4.0 ?. The counter emf of this motor when connected to a 120-V line and running at full speed is 104 V
(a) What is the start up current of this motor? (b) What is the current in the motor when running at full speed?
Optical interferometry is more in use than radio interferometry
Indicate whether the statement is true or false