A man standing on a bridge throws a stone horizontally with a speed of 20 m/s. The stone hits the water below 2.5 s later. The bridge is
A. 60.1 m high.
B. 30.6 m high.
C. 44.1 m high.
D. 20.3 m high.
Answer: B
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Describe the general features of the monolithic collapse hypothesis, with an explanation of how the two different stellar populations are explained by the model
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An electron is accelerated from rest through a potential difference of 3750 V. It enters a region where the magnetic field is 4.0 mT perpendicular to the velocity of the electron. Calculate the radius of the path this electron will follow
A) 1.2 cm B) 2.2 cm C) 3.2 cm D) 4.2 cm E) 5.2 cm
Lonnie pitches a baseball of mass 0.500 kg. The ball arrives at home plate with a speed of 35.0 m/s and is batted straight back to Lonnie with a return speed of 50.0 m/s. If the bat is in contact with the ball for 0.055 s, what is the impulse experienced by the ball?
a. 7.50 N/s b. 42.5 N/s c. 773 N/s d. 17.5 N/s e. 25.0 N/s
Radio telescopes have poor resolving power because
a. their diameters are so large. b. the energy they receive is not electromagnetic radiation. c. radio waves have long wavelengths. d. their diameters are so large and the energy they receive is not electromagnetic radiation. e. None of the other choices are correct.