Halos are caused by hexagonal ice crystals in the upper atmosphere
Indicate whether the statement is true or false
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Parallel Wires: Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in the same direction,
A. one wire is lifted slightly while the other wire is forced downward against the table's surface. B. both wires are lifted slightly. C. the wires pull toward each other. D. the wires push away from each other.
A motor drives a shaft at f 5 10 Hz and delivers P 5 35 kW of power. The allowable shear stress in the shaft is 45 MPa. The minimum diameter of the shaft is approximately:
(A) 35 mm
(B) 40 mm
(C) 47 mm
(D) 61 mm
The distance between Earth and the Moon
A. varies as the Moon orbits about Earth. B. remains constant as the Moon orbits about Earth.
A girl throws a rock horizontally with a speed of 12 m/s from a bridge. It falls 2.28 s before hitting the water below. Neglect air resistance
(a) How high is the bridge from the water below? (b) How far horizontally does the rock travel before striking the water?