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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 is thrown straight up from a bridge at 20.0 ms. the ball reaches its maximum height falls just misses the bridge
You are driving at night on a highway at a speed of 18.2m/s. All of a sudden you see a deer in the road 38 m ahead. what reaction time is required to avoid hitting the deer
A unit of area, often used in measuring land areas, is the "hectare", defined as 104m2. An open-pit coal mine consumes 66hectares of land, down to a depth of 23m, each year. What volume of earth, in cubic kilometers, is removed in this time.
A puck of mass m = 1.50 kg slides in a circle withradius r = 20 cm on a frictionless table while attachedto a hanging cylinder of mass M =2.50 kg by a cordthrough a hole in the table. What speed keeps the cylinder atrest
A four-turn circular wire coil of radius 0.495 m lies in a plane perpendicular to a uniform magnetic field of magnitude 0.415 T. what is the average induced emf in the wire during this time
A student is sleeping under a small goose-down comforter that has coefficient of thermal conductivity of 0.025 W/m °C. what is the rate of heat flow through the comforter
For the configuration shown below, suppose that a = 5.00 cm, b= 20.0 cm, and c = 25.0 cm. Furthermore, suppose that the electricfield at a point 10.0 cm from the center is 3.60 × 103 N/C radiallyinward, while the electric field at a point 50.0 cm ..
A heat engine operates between a reservoir at 26°C and one at 324°C. What is the maximum efficiency possible for this engine
An optometrist prescribes contact lenses that have a focal length of 50.0cm. (a) Are the lenses converging or diverging? (b) Is the person who wears them near-sighted or far-sighted?
The double star system Yasmin is observing is 4.2 * 10^16 m from earth and the two stars are separated from each other with 2.6 *10^11 m. Assuming that the average wave light of light emitted by the stars is 500 nm, estimate the diameter of the objec..
A ball is thrown vertically upward with a speed of 14.0 m/s. How long does it take to reach its highest point
If a woman lifts a 20.0 kg bucket from a well and does 6.00 kJ of work, how deep is the well? Suppose that the speed of the bucket remains constant as it is lifted.
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