A car is traveling with a constant speed of 30.0 m/s when the driver suddenly applies the brakes, causing the car to slow down with a constant acceleration. The car comes to a stop in a distance of 120 m
What was the acceleration of the car as it slowed down? A) 3.75 m/s2
B) 4.00 m/s2
C) 4.25 m/s2
D) 4.50 m/s2
E) 4.75 m/s2
A
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A wire (length = 2.0 m, diameter = 1.0 mm) has a resistance of 0.45?. What is the resistivity of the material used to make the wire?
a. 5.6 × 10^?7 ? / m b. 1.2 × 10^?7 ? / m c. 1.8 × 10^?7 ? / m d. 2.3 × 10^?7 ? / m e. 7.1 × 10^?7 ? / m
A juggler throws two balls to the same height so that one is at the halfway point going up when the other is at the halfway point coming down. At that point:
a. Their velocities and accelerations are equal. b. Their velocities are equal but their accelerations are equal and opposite. c. Their accelerations are equal but their velocities are equal and opposite. d. Their velocities and accelerations are both equal and opposite. e. Their velocities are equal to their accelerations.
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A 3.0-kg block slides on a frictionless 20° inclined plane. A force of 16 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
A. 2.0 m/s2 down the incline B. 5.3 m/s2 up the incline C. 2.0 m/s2 up the incline D. 3.9 m/s2 down the incline E. 3.9 m/s2 up the incline