The amount of geological activity occurring on a terrestrial planet is related
A) only to its distance from the Sun
B) only to the amount of internal radioactive heating
C) to its size and the amount of internal radioactive heating
D) only to its size
C
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A horizontal force of 750 N is needed to overcome the force of static friction between a level floor and a 250-kg crate. What is the acceleration of the crate if the 750-N force is maintained after the crate begins to move and the coefficient of kinetic friction is 0.16?
a. 1.8 m/s2 c. 3.0 m/s2 b. 1.4 m/s2 d. 2.1 m/s2
When a solid changes to a liquid and then to a gas, energy is
1) released, 2) absorbed, and when gas changes to liquid and then to solid, energy is 3) released. 4) absorbed.
A 2.0-kg block slides on a rough horizontal surface. A force (magnitude P = 4.0 N) acting parallel to the surface is applied to the block. The magnitude of the block's acceleration is 1.2 m/s2 . If P is increased to 5.0 N, determine the magnitude of the block's acceleration
a. 2.1 m/s2 b. 2.3 m/s2 c. 1.9 m/s2 d. 1.7 m/s2 e. 3.2 m/s2
A metal rod of length L in a region of space where a constant magnetic field points into the page rotates clockwise about an axis through its center at constant angular velocity ?. While it rotates, the point(s) at lowest potential is(are)
A. A. B. B. C. C. D. D. E. A and E.