A hoop is rolling without slipping along a horizontal surface with a forward speed of 5.50 m/s when it starts up a ramp that makes an angle of 25.0° with the horizontal
What is the speed of the hoop after it has rolled 3.00 m up as measured along the surface of the ramp?
A) 4.22 m/s
B) 1.91 m/s
C) 2.06 m/s
D) 3.79 m/s
E) 8.02 m/s
A
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A high-voltage powerline operates at 500,000 V rms and carries an rms current of 500 A. If the resistance of the cable is 0.050 ?/km, what is the resistive power loss in 200 km of the powerline?
A. 250 kW B. 500 kW C. 1 megawatt D. 2.5 megawatts E. 250 megawatts
The total radiant power emitted by a blackbody is proportional to its _________________ raised to the fourth power
Fill in the blank(s) with correct word
The charge of a proton is due to
A. rapid spinning of the proton. B. the high density of the proton. C. reasons physicists are not yet quite sure of, but they explain charge as a property of the proton. D. periodic pulsations of the surface of the proton.
An electric clothes dryer draws 10 A at 220 V. If the clothes put into the dryer have a mass of 10 kg when wet and 3 kg dry, about how long does it take to dry the clothes? (Assume all heat energy goes into vaporizing water, Lv = 2.26 × 10^6 J/kg)
a. 171 min b. 120 min c. 51 min d. 40 min e. 5 min