What is the approximate magnification of a compound microscope with objective and eyepiece focal lengths of 0.30 cm and 4.1 cm, respectively, and a separation between lenses of 40 cm?
a. 320
b. 33
c. 32
d. 810
e. 7.1
d
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The phase angle in a series RL circuit at 1000 Hz with a 200-? resistor and a certain inductor is 40.0°. What is the value of the inductance in this circuit?
A) 83.9 mH B) 73.9 mH C) 26.7 mH D) 36.7 mH E) 57.9 mH
In a two-body collision, if the kinetic energy of the system is conserved, then which of the following best describes the momentum after the collision?
a. must be less b. must also be conserved c. may also be conserved d. is doubled in value
Probably the best-known comet is ______________ Comet
Fill in the blank(s) with correct word
A heat engine operates between a high temperature reservoir at TH and a low temperature reservoir at TL. Its efficiency is given by 1 ? TL/TH :
A. only if the working substance is an ideal gas B. only if the engine is reversible C. only if the engine is quasi-static D. only if the engine operates on a Stirling cycle E. no matter what characteristics the engine has