Work done by STATIC FRICTION is always
A) along the surface.
B) perpendicular to the surface.
C) positive.
D) negative.
E) zero.
E
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Radioactivity Basics: The atom 
Fr decays to 
Ra by emitting what kind of nuclear radiation?
A. alpha B. beta-minus C. beta-plus D. gamma E. x-rays
The major chemical component of the air we breathe today was deposited on Earth primarily via
a. volcanic eruptions. b. cometary impacts. c. asteroid impacts. d. chemical reactions in Earth's oceans.
The equation of continuity applied to an incompressible ideal fluid flowing through a pipe of varying diameter is based on what of the following being conserved for the fluid in the pipe?
a. its kinetic energy c. its flow rate b. its momentum d. its potential energy
A satellite in an elliptical orbit travels at a
1) constant speed 2) variable speed 3) not enough information to say because 4) the net force acting on it is zero. 5) of the component of gravitational force existing in its direction of motion. 6) it is characteristic of it to do so. 7) again, not enough information is given to say.