When a body moves in circular motion at constant speed the velocity and acceleration point in opposite directions
a. True
b. False
Indicate whether the statement is true or false
False
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Describe the three sources of internal heat of the terrestrial planets.
Fill in the blank(s) with the appropriate word(s).
Since it was first predicted in the 1970s, scientists have observed the evaporation of about a dozen black holes
Indicate whether the statement is true or false
A 2.4-kg ball falling vertically hits the floor with a speed of 2.5 m/s and rebounds with a speed of 1.5 m/s. What is the magnitude of the impulse exerted on the ball by the floor?
A.
sB.
sC.
sD.
sE.
sAtoms of materials that are good conductors of electricity have
A. only electrons, and so these electrons are easily moved. B. mostly protons; thus, the negative charges jump easily from atom to atom. C. outer electrons which are loosely bound and thus easily moved. D. no electrons; thus, any that are given to them are easy to move about.