A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 starts from rest at t = 0 . The wheel has a diameter of 20 cm. What is the magnitude of the total linear acceleration of a point on the outer edge of the wheel at t = 0.60 s?
a. 0.25 m/s2
b. 0.50 m/s2
c. 0.14 m/s2
d. 0.34 m/s2
e. 0.20 m/s2
a
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There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with his finger until help arrived. Which of the following is most likely?
A) The huge size of the Atlantic Ocean makes this impossible. B) The force on his finger would be huge but the pressure small enough. C) The force on his finger would have been less than 1 N. D) Both the force and pressure on his finger would have been huge. E) none of the above
A new electric power plant has an efficiency of 42%. For every 100 barrels of oil needed to run the turbine, how many are essentially lost as waste heat (in barrels of oil) to the environment?
a. 21 b. 42 c. 58 d. 10 e. 79
Assume that the average rate of 1-km-sized asteroids hitting the Earth is about 1 every million years. The chance of the Earth being hit by a 1-km-sized asteroid in the next 100 years is about
A) one in 100 million. B) one in ten thousand. C) inevitable, it has to happen sometime. D) zero. E) one in a million.
When the frequency of the source of a water wave increases, the speed of the waves traveling in the water
a. remains unchanged. b. increases. c. decreases. d. cannot be determined.