A wheel is rotated about a horizontal axle at a constant angular speed. Next it is rotated in the opposite direction with the same angular speed. The acceleration at a point on the top of the wheel in the second case as compared to the acceleration in the first case:
a. is in the same direction.
b. is in the opposite direction.
c. is upward.
d. is tangential to the wheel.
a
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The ____________________ of Earth is composed of rocks at high density that behave as a plastic
Fill in the blank(s) with correct word
The light travel time distance to the cosmic horizon is about ________.
A. 14 × 1011 light-years B. 14 × 105 light-years C. 14 × 109 light-years D. 14 × 107 light-years
An unstable particle is moving at a speed of 2.6 × 108 m/s relative to a laboratory. Its lifetime is measured by a stationary observer in the laboratory to be 4.7 × 10-6 seconds
What is the lifetime of the particle, measured in the rest frame of the particle? (c = 3.00 × 108 m/s) What will be an ideal response?
What is the magnitude of the horizontal-velocity component of the rock as it hits the ground?
a. 79.5 m/s b. 8.81 m/s c. 58.7 m/s d. 7.39 m/s