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If electrical energy costs 12 cents, or $0.12, per kilowatt-hour, then what would the following events cost?
a) Burn a 60 W light bulb for 24 h straight.
b) Operate an electric oven for 6.0 h if it carries a current of 20.0 A at 220 V.
The loaded cab of an elevator has a mass of 3.0 x10^3 kg and moves 236 m up the shaft in 23s at constant speed. At what average speed does the force from the cable do work on the cab?
By holding a magnifying glass 32 from your desk lamp, you can focus an image of the lamp's bulb on a wall 1.8 from the lamp. What is the focal length of your magnifying glass
A 5.7-kg block of aluminum is heated from 30°C to 70°C at atmospheric pressure. Find the amount of energy transferred to it by heat
An object with a mass of m = 4.6 kg is attached to the free end of a light string wrapped around a reel of radius R = 0.265 m, determine the velocity when it hits the floor
Explain by how much does the potential energy of a 23.0-kg child increase when the child climbs a normal staircase to the second floor?
A 885 g block oscillates on the end of a spring whose force constant is k = 56 N/m. The mass moves in a fluid which offers a resistive force F = -bv, where b = 0.162 N·s/m. (a) What is the period of the motion? s (b) What is the fractional decrease i..
After fixing a flat tire on a bicycle you give the wheel aspin. what was its average angular acceleration
A point P is on a rim of a wheel of radius 2.0m. At time t=0 wheel is at rest and P is on the x-axis. The wheel undergoes a uniform angular acceleration of 0.01 rad/s2 about the center O. Find out the time t, when P returns to an original position on..
The maximum current in a superconducting solenoid can be as large as 3.54 kA. what is the magnitude of the magnetic field it produces
you need to design a 60.0-hz ac generator that has a maximum emf of 5600 v. the generator is to contain a 170-turn coil
An old-fashioned single-play vinyl record rotates on a turntable at 58.0\({\rm rpm}\), What are the angular velocity in rad/s and period of the motion
Two light bulbs labeled 50 W and 100 W, find the actual power consumed by the brighter bulb
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