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Two students are on a balcony 19.2 m above the street. One student throws a ball vertically downward at 14.9 m/s; at the same instant the other student throws a ball vertically upward at the same speed. The second ball just misses the balcony on the way down.
(a) What is the difference in their time in air?
s
(b) What is the velocity of each ball as it strikes the ground?
m/s
(c) How far apart are the balls 0.900 s after they are thrown?
m
A high-speed lifting mechanism supports a 745-kg object with a steel cable that is 31.0 m long and 4.00 cm2 in cross-sectional area. Determine the elongation of the cable
Three charges (q1 = 7.6 ?C, q2 = -4.7 ?C, and q3 = 1.1?C) are located at the vertices of an equilateral triangle with side d = 6.1 cm. q1 is on the bottom left, q2 is on the bottom right, and q3 is at the top.
The frequency doubled output of a Nd3+ YAG laser has a wavelength of 532nm. If each pulse of light has a total energy of 0.550J and the repetition rate of the laser is 30Hz, how many photons does the laser emit at 532nm in 3 minutes.
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A wheel of diameter 24.0 cm is constrained to rotate in the xy plane, about the z axis, which passes through its center. What is the torque about the rotation axis at this instant
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What is the potential difference measured by voltmeter
find the x and y components of each vector.
Express your answers using two significant figures. Enter the x and y coordinates of the charge separated by a comma.
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