In pushing an object on a level surface, work is done against ______________
Fill in the blank(s) with correct word
friction
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Molecular Speeds: What is the average translational kinetic energy of an ideal gas at 819 K? The Boltzmann constant is 1.38 × 10-23 J/K.
A. 1.70 × 10-20 J B. 5.65 × 10-21 J C. 1.13 × 10-17 J D. 3.77 × 10-19 J
The drawing shown is supposed to be a free-body diagram of a crate that is being lowered by a crane and is speeding up as it is being lowered. Is the diagram correct? (Ignore air resistance.)
A. Yes.
B. No, 
should be labeled 
C. No, 
should be equal to 
.
D. No, 
should be greater than 
E. No, there should be an upward drag force 
F. No, there is some other problem (specify).
Which of the following most likely explains why Venus does not have a strong magnetic field?
A) It does not have a metallic core. B) Its rotation is too slow. C) It is too close to the Sun. D) It is too large. E) It has too thick an atmosphere.
According to Lenz's law the direction of an induced current in a conductor will be that which tends to produce which of the following effects?
a. oppose the effect which produces it c. produce the greatest voltage b. enhance the effect which produces it d. produce a greater heating effect