Which requires the most amount of work by the brakes of a car?
A) slowing down from 100 km/h to 70 km/h
B) slowing down from 70 km/h to a stop
C) equal amounts for both
Answer: A
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If the absolute value of the magnification is larger than one, then the image is
A) larger than the object. B) the same size as the object. C) smaller than the object.
Consider a point on a bicycle wheel as the wheel makes exactly four complete revolutions about a fixed axis. Compare the linear and angular displacements of the point
a. Both are zero. c. Only the linear displacement is zero. b. Only the angular displacement is zero. d. Neither is zero.
A type-II supernova
a. occurs when a white dwarf's mass exceeds the Chandrasekhar limit. b. is the result of helium flash. c. is characterized by a spectrum that shows hydrogen lines. d. occurs when the iron core of a massive star collapses. e. c and d
When an object is inside the focal point of a concave mirror, a(n) ______________ image always results
Fill in the blank(s) with correct word