An electron moving from the negative terminal to the positive terminal of a 12. volt battery gains (or loses) how much energy? (Be sure to indicate whether it is a gain or loss.)
What will be an ideal response?
Loses 12. eV = 1.9 × 10-19 J
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An refrigerator keeps food in the freezer portion at 
and dumps excess heat into the kitchen, whose temperature is 
If the refrigerator has half the coefficient of performance of an ideal reversible refrigerator, and if its motor can supply 250W of power, what is the rate of heat flow into the kitchen?
A. 950W B. 910W C. 625W D. 150W
In the figure, an airport luggage-carrying train with a tractor T is pulling three luggage carts, src="https://sciemce.com/media/4/dbb7a8fd287d574913.png" class="w-image" />and cart 
and 
with an acceleration of 1.0 
If T = 300 kg, 
= 200 kg, 
= 100 kg, and 
= 100 kg, then the force in the connection between cart 
is
A. 700 N.
B. 400 N.
C. 200 N.
D. 100 N.
E. 0 N.
Contrast the main mirrors of Newtonian and Cassegrain designs
What will be an ideal response?
What characteristics of a sound wave are related to the "pitch" of a musical note? (There could be more than one correct choice.)
A) amplitude B) wavelength C) frequency D) period