You slam on the brakes of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?
A)
It would have skidded 4 times farther.
B)
It would have skidded twice as far.
C)
It would have skidded 1.4 times farther.
D)
It would have skidded one half as far.
E)
It is impossible to tell from the information given.
A
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Magnifying Glass With the Image at Infinity: A lens of focal length 40 mm is used as a magnifier. The object being viewed is 5.3 mm long, and is positioned at the focal point of the lens. The user of the magnifier has a near point at 25 cm. What is the angular magnification of the magnifier?
A. 6.3 B. 5.6 C. 6.9 D. 7.5 E. 8.1
A torque of 20.0 N•m is applied to a bolt. The bolt rotates through an angle of 180 degrees. The work done in turning the bolt is
A. 72.5 J. B. 51.9 J. C. 62.8 J. D. 49.9 J. E. 58.4 J.
Suppose you see two stars: a blue star and a red star. Which of the following can you conclude about the two stars? Assume that no Doppler shifts are involved. (Hint: Think about the laws of thermal radiation.)
A) The red star is more massive than the blue star. B) The blue star is more massive than the red star. C) The blue star is farther away than the red star. D) The blue star has a hotter surface temperature than the red star. E) The red star has a hotter surface temperature than the blue star.
If 
= 10, 
= 15, and ? = 130°, determine the scalar product of the two vectors shown.
?
?
A. +96
B. ?96
C. +51
D. ?51
E. ?35