We say that energy cannot be created nor destroyed, yet a heat pump usually delivers more energy (heat) into the house than it receives from the power source (electricity, gas, etc). Why is this not a violation of the law of conservation of energy?
What will be an ideal response?
The extra energy was extracted from some environmental source like the outside air or from the ground.
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Multiple-Object Accelerating Systems: Two boxes P and Q on a perfectly smooth horizontal surface are connected by a light horizontal cord. The mass of P is greater than that of Q. A horizontal force 
is applied to box Q as shown in the figure, accelerating the bodies to the right. The magnitude of the force exerted by the connecting cord on body P is
A. zero. B. less than F but not zero. C. equal to F. D. greater than F.
The kinetic coefficient of friction is usually larger than the static coefficient of friction
Indicate whether the statement is true or false
A light bulb is rated at 30 W when operated at 120 V. How much charge enters (and leaves) the light bulb in 1.0 min?
a. 17 C b. 15 C c. 14 C d. 13 C e. 60 C
The apparent "surface" of Jupiter is actually the tops of ________
Fill in the blank(s) with correct word