An object is thrown downward with an initial (t = 0) speed of 10 m/s from a height of 60 m above the ground. At the same instant (t = 0), a second object is propelled vertically upward from ground level with a speed of 40 m/s. At what height above the ground will the two objects pass each other?
a. 53 m
b. 41 m
c. 57 m
d. 46 m
e. 37 m
B
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Particles (mass of each = 0.40 kg) are placed at the 60-cm and 100-cm marks of a meter stick of negligible mass. This rigid body is free to rotate about a frictionless pivot at the 0-cm end. The body is released from rest in the horizontal position. What is the magnitude of the initial linear acceleration of the end of the body opposite the pivot?
A. 15 m/s2 B. 9.8 m/s2 C. 5.8 m/s2 D. 12 m/s2 E. 4.7 m/s2
Gravitational potential energy is equal to the ______________ of an object times its height
Fill in the blank(s) with correct word
A light beam has speed c in vacuum and speed v in a certain plastic. The index of refraction n of this plastic is
A) n = cv. B) n = (v/c)2. C) n = v/c. D) n = c/v. E) n = (c/v)2.