An object starts from rest with an acceleration of 2.0 
for 3.0 seconds. It then reduces its acceleration to 1.0 
for 5.0 additional seconds. The total distance covered is
A. 52 m.
B. 38 m.
C. 11 m.
D. 9.0 m.
E. 7.6 m.
A. 52 m.
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An object of radius R and moment of inertia I rolls down an incline of height H after starting from rest. Its total kinetic energy at the bottom of the incline:
a. is gR/I. b. is I/gH. c. is 0.5Ig/H. d. cannot be found from the given information alone.
The earliest evidence of ancient life, blue-green algae, are
a. cyanobacteria. b. amber. c. foraminifera. d. coal.
The term "relativistic" refers to effects that are
A. measured by stationary observers only. B. observed when speeds are near the speed of light. C. observed when objects move backward in time. D. noticed about a moving object.
A conducting rod (length = 80 cm) rotates at a constant angular rate of 15 revolutions per second about a pivot at one end. A uniform field (B = 60 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the emf induced between the ends of the rod?
a. 2.7 V b. 2.1 V c. 2.4 V d. 1.8 V e. 3.3 V