Automobile air bags reduce what during a collision?
A) speed of the automobile
B) the forces exerted upon the passenger
C) the kinetic energy transferred to the passenger
D) the impulse exerted upon the passenger
B
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Why are main-sequence lifetimes shorter for more massive stars?
A) They aren't; higher mass stars have longer lifetimes. B) Strong stellar winds cause higher mass stars to lose mass quickly. C) Higher core temperatures allow fusion to proceed much more rapidly. D) More massive stars are made of heavier elements that don't fuse as easily.
You need to make a sharp turn on a flat road, making a radius of curvature of 15 meters. How does the required force of static friction between your tires compare if you make the turn at 30 mph vs. 60 mph?
A) The force of friction needs to be four times as large. B) The force of friction needs to be twice as large. C) the force of friction is the same for both speeds since the radius of curvature is the same. D) None of the above
A mass is accelerated when ______________ acts upon the mass
a. a balanced force b. any force c. no force d. an unbalanced force e. none of these
Double-Slit Interference: At most, how many bright fringes can be formed on one side of the central bright fringe (not counting the central bright fringe) when light of 625 nm falls on a pair of slits that are 6.77 × 10-6 m apart?
A. 10 B. 9 C. 8 D. 11 E. 12