The kinetic energy of a bullet, per gram, is
A. about the same as the energy released from 1 gram of TNT
B. about the same as the kinetic energy in a typical 1-gram meteor
C. about the same as the energy released by 1 gram of chocolate chip cookies
D. none of the above
Ans: D. none of the above
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Scientific notation is used in science because
a. it makes it easy to write big or small numbers. b. all astronomical distances are expressed in metric units. c. it makes conversions between units easy. d. all of the above
An object moving at a relativistic speed past a stationary observer appears to
A. have length expanded and have a slower clock. B. have length contracted and have a slower clock. C. have length expanded and have a faster clock. D. have length contracted and have a faster clock. E. be completely normal.
The source of the earth's magnetic field is thought to be due to the motion of charged particles in the earth's
A) mantle. B) crust. C) inner core. D) outer core. E) mantle & crust.
A baseball catcher puts on an exhibition by catching a 0.15-kg ball dropped from a helicopter at a height of 91 m. What is the speed of the ball just before it hits the catcher's glove 1.0 m above the ground? (g = 9.8 m/s2 and ignore air resistance)
a. 84 m/s c. 42 m/s b. 38 m/s d. 19 m/s