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The transformer in the power supply for a computer's 500-GB external hard drive changes a 120-V input voltage (from a regular house line) to the 5.0-V output voltage that is required to power the drive. If the drive is rated at 10 W when running and the transformer is ideal, what is the current in the primary and secondary when the drive is in operation?
A hotel elevator ascends 160m with a maximum speed of 4.20 m/s. Its acceleration and deceleration both have a magnitude of 1.0 m/s2. How long does it take to make the complete trip from bottom to top.
Charge is scattered uniformly throughout a long cylindrical shell of inner radius R and out radius 2R. At what radius is the electric field equal to one-half the value on the outer surface.
When burned, 3.7 tons of coal releases the amount of energy that you use over the course of a year in the form of heat. How many tons of coal are required to provide you with your yearly energy use if you were to get that energy from a coal burnin..
An archer shoots an arrow with a velocity of 45m/s at an angle of 50 degrees with the horizontal. An assistant standing on the level ground 150 m downrange from the launch point throws an apple straight up with the least initial speed required to ..
When a diver jumps into the ocean, water leaks into the gap region between the diver's skin and her wetsuit, estimate how much energy (in units of candy bars = 300 kcal) is required by this heating process
A boy is attempting to swim directly across a river; he is able to swim at a speed of 0.421 m/s relative to the water. The river is 2.48 m wide and the boy ends up at 4.77 m downstream from his starting point.
The nuclear reaction that powers the sun is the fusion of four protons into a helium nucleus. How much energy is released in each fusion
Two objects attract each other gravitationally with a force of 2.5 * 10^-10N when they are .25m apart. There total mass is 5.00kg. Find their individual masses
A track athlete running at fast pace had an instantaneous resultant force of 2800 N acting through the heel during heel strike, what were the horizontal and vertical forces acting on the heel
Two ball shells are nested together ( centers exerting). The smaller balls diameter is R1 and bigger ones R2, Derive capacitance of the system from its definition C=Q/I?VI
Earth's radius is 6.37 106 m. Illustrate by what percent does the Moon's gravitational pull on you increase?
Find out d, the distance between the photogates, using the times and glider length. There is two ways to find this for the up and down directions.
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