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A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. An 760-kg helicopter rises from rest to a speed of 8.9 m/s in a time of 3.7 s. During this time it climbs to a height of 7.4 m. What is the average power generated by the lifting force?
P =
if a home operates on an average of 1.1 kw electricity how many fuel pellets of uranium dioxide uo2 are required to
A parallel-plate capacitor is made of two flat metal plates pressed against a thin slab of dielectric material. What is the dielectric constant of the material that was initially used to fill the gap between the plates
A clock has an aluminum pendulum with a period of 1.000 s at 22.1 °C. Suppose the clock is moved to a location where the average temperature is 32.7 °C. (The linear expansion coefficient for aluminum is 2.20 10-5 °C−1.)
Two containers hold identical amounts of a monatomic gas at 20. Container A is rigid. What are the initial pressures in containers A and B
A wrecking ball (weight = 4600 N) is supported by a boom, which might be assumed to be uniform and has a weight of 3600N. As the drawing shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and t..
A helicopter of mass 3770 kg can create an upward lift forceF. When empty, it can accelerate straight upward at amaximum of 1.37 m/s2. What is the mass of the cargo
The first and second electron shells of an element are filled and there are five electrons in the third electron shell
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A unit vector lies in the xy plane, at an angle of 138 degrees from the +x axis, with a positive y component. What is the unit vector
Steam at 100 degrees C is added to ice at 0 degrees C. Find the amount of ice melted and the final temperature when the mass of steam is 13 g and the mass of ice is 48 g
How much force is the air exerting on the front cover of a book that is 23.9 cm long and 16.9 cm wide
A Carnot air conditioner takes energy from the thermal energy of a room at 70 degrees F and transfers it as heat to the outdoors,which is at 96 degrees F. For each joule of electric energyrequired to operate the air conditioner, how many joules arere..
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