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Two energy reservoirs are at 20 degrees Celsius and 827 degrees Celsius. A heat engine operating between these reservoirs has 40% of the maximum possible efficiency. How much energy does this engine extract from the hot reservoir to do 3500 J of work?
A proton accelerates from rest in a uniform electric field of 652 N/C. At some later time, its speed is 1.26 106 m/s. How far has it moved in that interval
When certain light rays pass from a vacuum into a block of an unknown material, What is the speed of light inside the block
In the school cafeteria, a trouble-making child blows a 10.0 g spitball through a 30.0 cm straw. what is the speed of the spitball as it leaves the straw
An 80 kg man stands in an elevator. What force does the floor of the elevator exert on the man
A 72.3 kg man carrying a 5.23 kg box gets on an elevator. As the elevator accelerates upwards at 0.224 m/s^2, he feels the box is heavier, During this time, what is the weight on the floor from his feet
A 50 g ice cube floats in 200 g of water in a 100 g copper cup; all are at a temperature of 0°C. What is the mass of the lead
A house has a floor area of 113 m2 and an outside wall that has an area of 26 m2. The earth's magnetic field here has a horizontal component of 3.0 multiplied by 10-5 T that points due north and the vertical component of 4.9 multiplied by 10-5 T p..
Oxygen gas having a volume of 1180 cm3 at 47.3°C and 1.00 x 105 Pa expands until its volume is 1900 cm3 and its pressure is 1.08 x 105Pa. determine the final temperature of the sample
The loop shown below is immersed in a uniform magnetic field that points into the page and stretches across the entire page.
A narrow beam of 400-keV photons is incident normally on a 2 mm iron liner. What fraction of the photons has an interaction in the liner? What thickness of Fe is needed to reduce the fraction of photons that are transmitted without interaction to 10%..
A proton is at the origin and an electron is at the point x=0.63nm, y=-0.45nm. Find the magnitude of electric force on the proton
What did Newton discover about gravity? 1. All objects near the Earth free fall with the same acceleration. 2. Any force on a planet would be directed along its path. 3. Gravity only happens on Earth.
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