Mitch throws a 100-g lump of clay at a 200-g target, which is at rest on a horizontal surface. After impact, the target, including the attached clay, slides 2.1 m before stopping. If the coefficient of friction is µ = 0.50, find the speed of the clay before impact
a. 4.5 m/s
c. 27 m/s
b. 14 m/s
d. 36 m/s
B
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Lenz's Law: As shown in the figure, a metal bar is in contact with a pair of parallel rails. A steady, uniform, magnetic field B is present directed to the right. The bar is moving upward with velocity of magnitude ?. What is the polarity of the induced emf in terminals X and Y?
A. X and Y are at the same potential. B. X is positive and Y is negative. C. Y is positive and X is negative.
The following figures show a top view of Earth, sunlight, and six different positions of the Moon as it orbits Earth. Note that the distances shown are not drawn to scale. Rank each of the six lunar positions from left to right based on the amount of the Moon’s illuminated surface that is visible from Earth, from greatest to least. (If two diagrams have an equal amount of illumination as seen from Earth, put one on top of the other.)
Why can one not use quasars to check the Hubble relation relating distances of objects to their velocity of recession?
What will be an ideal response?
A proton's rest mass is 1.67 × 10?27 kg. Calculate its kinetic energy when it is accelerated to a speed of 0.80c.
A. 1.0 × 10?10 J B. 1.5 × 10?10 J C. ?2.0 × 10?10 J D. 2.5 × 10?10 J E. 7.5 × 10?10 J