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Why do power companies use low currents in power lines when transferring electrical energy over large distances?_Because power lines have resistance and resistors transform electrical energy into thermal energy. High currents would require larger power lines to reduce the amount of heat loss and hence be much more expensive than the small power lines that low currents require._Because power lines have resistance and resistors transform electrical energy into heat. The lower the current, the less heat generated (and hence the less electrical energy lost)._Because power lines have resistance and resistors transform electrical energy into thermal energy. According to Ohm's Law, the lower the current the lower the voltage. Thus both the voltage & current will be low and hence the power loss will be small._Because power lines have resistance and resistors transform electrical energy into heat. The lower the current the lower the resistance of the power lines and hence the less electrical energy is lost to heat.
Five kilograms of liquid carbon tetrachloride undergo a mechanically reversible, isobaric change of state at 1 bar during which the temperature change from 0 C to 20 C.
A solid cylinder of mass 3 kg and radius 0.2 m starts from rest at the top of a ramp, inclined 15°, and rolls to the bottom without slipping. (For a cylinder I = 0.5MR2) The upper end of the ramp is 1.2 m higher than lower end. Find the linear sp..
A potter's wheel is a uniform solid disk of diameter 0.72m and a mass of 60kg. what minimum total friction force must the potter supply to the disk if her hands are acting at the edge of the disk
The top of a tower much like the leaning bell tower at Pisa, Italy, moves toward the south at an average rate of 1.4 mm/y, what is the average angular speed of the tower's top about its base
The cable of the 1900 kg elevator cab shown the figure snaps when the cab is at rest at the first floor, where the cab bottom is a distance d = 4.7 m above a spring of spring constant k = 0.18 MN/m. Find the speed of the cab just before it hits the..
a 70.9 kg boy and a 43.2 kg girl both wearing skates face each other at rest on a skating rink the boy pushes the girl
An RLC circuit has a resistance of 2 komega, a capacitance of 32 uF, and an inductance of 52 H. obtain the phase shift between the current and the voltage
A speed skater moving across frictionless ice at 8.6 m/s hits a 5.5 m wide patch of rough ice. She slows steadily, What is her acceleration on the rough ice
A sledge loaded with bricks has a total mass of 17.4 kg and is pulled at constant speed by a rope inclined at 20.4° above the horizontal. How much work is done by the rope on the sledge
you are leaking one liter of methyl alcohol methanol every 3 hours. at the start of the day you have a concentration of
A BB gun shoots pellets so that their velocity is given by v = (-5.00 107) t 2 + (2.80 105) t, Determine the length of time the pellet is accelerated
Determine the location at which the tuning is formed and the vibrating frequency of a string to form a standing wave pattern.
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