If Alex wishes to rotate his skateboard, then he must apply a
A) torque.
B) rotational maneuver.
C) pause before bearing down on the board.
Answer: A
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When a hydraulic press is properly used it is capable of multiplying force input
A) true B) false C) true only in special cases, energy as well
Two experiments are performed. In (A), an 18.0 N force pushes horizontally on a 2.00 kg block that then pushes on a 4.00 kg block. In (B), an 18.0 N force pushes on a 4.00 kg block that then pushes on a 2.00 kg block. Which statement is correct?
a. The acceleration is 3.00 m/s2 in both (A) and (B). b. The acceleration is 4.50 m/s2 in both (A) and (B). c. The acceleration is 6.00 m/s2 in both (A) and (B). d. The acceleration is 9.00 m/s2 in both (A) and (B). e. The 2.00 kg block has a 9.00 m/s2 acceleration. The 4.00 kg block has a 4.50 m/s2 acceleration.
A child is standing at the rim of a freely rotating disk holding a rock. The disk rotates without friction. The rock is dropped at the instant shown. As a result of dropping the rock, what happens to the angular velocity of the child and disk?
A jet airliner moving at 600 mph due east moves into a region where the wind is blowing at 120 mph in a direction 30.0° north of east. What is the new speed and direction of the aircraft?
a. 706 mph, 5.67° N of E c. 706 mph, 4.87° N of E b. 620 mph, 5.67° N of E d. 588 mph, 4.87° N of E