Friction: A driver in a 1000-kg car traveling at 24 m/s slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the level road is 0.80, how long will the skid marks be?
A. 37 m
B. 30 m
C. 46 m
D. 34 m
Answer: A
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In a shuffleboard game, the puck slides a total of before coming to rest. If the coefficient of kinetic friction between the puck and the horizontal board is 0.28, what was the initial speed of the puck?
A) 8.1 m/s B) 29.0 m/s C) 6.5 m/s D) 7.3 m/s
A laser beam is incident from the air at an angle of 30.00° to the vertical onto a solution of Karo syrup in water. If the beam is refracted to 19.24° to the vertical, what is the index of refraction of the syrup solution?
Clocks in a moving reference frame, compared to identical clocks in a stationary reference frame, appear to run
A. backward in time. B. slower. C. faster. D. at the same rate.
The formation of a galactic central bulge is believed to ____
a. be a slow steady process lasting billions of years b. start after the formation of spiral arms c. be a violent process which adds mass to the central black hole d. begin when the central black hole has reached mature size e. continue throughout the galaxy's life body