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?
(a) 25 m (b) 27 m
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Imagine an experiment in which a 8 lb bowling ball and a 10 lb bowling ball are dropped from the fifth floor at the same time. The heavier ball will reach the ground first
a. true b. false
Evidence for the big bang comes from
A) observations of the pulsations of distant neutron stars. B) observation of the cluster of stars near the center of the Milky Way galaxy. C) the observation that the galaxies are all receding from each other. D) All of the above. E) None of the above.
Transformers use ac so there will be the required
A) transfer of energy from coil to coil. B) voltage for transformation. C) change in magnetic field for operation. D) change in input current. E) magnetic field intensities.
The kinetic energy of an electron in orbit in hydrogen is _______ times its potential energy.
A. 1 B. -1 C. 1/2 D. -1/2 E. 2