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An energy-efficient refrigerator consumes energy at the rate of 280W when it's actually running, but it's so well insulated that it runs only about one-sixth of the time. You pay for that efficiency up front: It costs $950 to buy the refrigerator. You can buy a conventional refrigerator for $700. However, it consumes 400W when running, and it runs one-fourth of the time. Calculate the total energy used by each refrigerator over a 10-year lifetime and then compare the total costs--purchase price plus energy cost--assuming electricity costs 10 cents per kilowatt-hour.
A ball rolls from rest down a roof without slipping. the roof has pitch of 30 degree until there is a flat, horizontal section near the edge of the roof. what was its angular momentum when it left the roof
question a solid ball encounters a 0.760 m vertical rise on the way back to the ball rack. ignore frictional losses and
A block with a mass of 25 kg is hung midway between two pulleys, with a rope connecting a hook at the top of the block to each of the two pulleys. If the pulleys are 45 cm apart, how far below the level of the pulleys does the top of the 25 kg mas..
Three equal point charges, each with charge 1.25%u03BCC , are placed at the vertices of an equilateral triangle whose sides are of length 0.250m. What is the electric potential energy U of the system
In the overhead view of Fig. 9-54, a 300 g ball with a speed v of 6.0 m/s strikes a wall at an angle ? of 30°, determine the impulse on the ball from the wall
just as you touch a metal door knob a spark of electricity electrons jumps from your hand to the knob. the electric
Assume you take a 2.0 ×102 ohm resistor and a 6.0 µF capacitor and make a series circuit with a voltage source that has voltage amplitude 30 Volt and an angular frequency of 2.5×102 rad/s. Determine what is the impedance of the circuit
If a constant force of 416 N acts in the direction opposite to the body's motion, how long must the force act to bring the body to rest
A pendulum consists of a sphere of mass 1.8 kg attached to a light cord of length 10.5 m, What is the tension of the cord at the lowest point
Two rubber bands cause an object to accelerate with acceleration a. How many rubber bands are needed to cause an object with half the mass to accelerate five times as quickly
The electric field just above the surface of the charged hollow drum of a photocopying machine has a magnitude E of3.0E+5 N/C. What is the surface charge density on thedrum if it is a conductor? ((assume it is the shape of acylinder))
An ocean liner leaves New York City and travels 39.0° north of east for 140 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship's displacement vector in the following directions.
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