Water flows over a section of Niagara Falls at a rate of 6.00 × 10^5 kg/s and falls 50.0 m. What is the power dissipated by the waterfall?
a. 588 MW
c. 147 MW
b. 294 MW
d. 60.0 MW
B
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Impulse: During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a very long barrel. What was the reason for using a long barrel in these guns?
A. to exert a larger force on the shells B. to reduce frictional losses C. to allow the force of the expanding gases from the gunpowder to act for a longer time D. to increase the force exerted on the bullet due to the expanding gases from the gunpowder E. to reduce the force exerted on the bullet due to the expanding gases from the gunpowder
A 3.0 m organ pipe is open at both ends and contains air. The velocity of sound in air is 331 m/s. What is the wavelength of the lowest frequency mode?
A. 1.5 m B. 3.0 m C. 6.0 m D. 9.0 m E. 12.0 m
Nichrome wire, often used for heating elements, has resistivity of 1.0 × 10-6 ? ? m at room temperature. What length of No. 30 wire (of diameter 0.250 mm) is needed to wind a resistor that has 50 ohms at room temperature?
A) 3.66 m B) 2.45 m C) 0.61 m D) 6.54 m E) 22.4 m
The Earth's density increases with depth. If instead the Earth had uniform density, but the same angular velocity and mass, how would its rotational kinetic energy compare to the actual value?
a. It would be the same as the actual value. b. It would be less than the actual value. c. It would be greater than the actual value. d. More information is needed to find the answer.