A stone is thrown from the top of a building with an initial velocity of 20 m/s downward. The top of the building is 60 m above the ground. How much time elapses between the instant of release and the instant of impact with the ground?
A. 2.0 s
B. 6.1 s
C. 3.5 s
D. 1.6 s
E. 1.0 s
Answer: A
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A pendulum is made with a 4.00 kg mass suspended at the end of a 75.0 cm thin rod. The pendulum is started at an angle of 20.0 degrees with the vertical. What is the velocity of the pendulum as it passes through the origin?
A. 98.9 cm/s B. 94.2 cm/s C. 89.2 cm/s D. 82.1 cm/s E. 79.5 cm/s
Archimedes' Principle states that...
A. the pressure in a fluid is directly related to the depth below the surface of the fluid. B. an object immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid. C. the velocity of a fluid is directly proportional to the pressure exerted on the fluid. D. the pressure of a fluid is inversely proportional to the temperature of the fluid.
Olbers's paradox seeks the explanation for why the night sky is dark
Indicate whether the statement is true or false
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
a. as a concave mirror in air. b. as a concave lens in air. c. as a convex lens in air. d. as a flat refracting surface between water and air as seen from the water side. e. as the glasses worn by a farsighted person.