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a student ate a thanksgiving dinner that totaled 2400 cal. He wants to use up all that energy by lifting a 27 kg mass a distance of 1.0 m. Assume that he lifts the mass with constant velocity and no work is required in lowering the mass.
A. How many times must he lift the mass?
B. If he can lift and lower the mass once every 4.2 s, how long does it the exercise take?
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When light of wavelength 350 nm falls on a potassium surface, electrons having a maximum kinetic energy of 1.31 eV are emitted, find the cutoff wavelength
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A person of mass 75 stands at the center of a rotating merry-go-round platform of radius 2.8 and moment of inertia 920. The platform rotates without friction with angular velocity 1.78. The person walks radially to the edge of the platform. Compute a..
An ice cream cone is filled with melted vanilla ice cream of density 1.21g/cm3 The cone is 10.1cm long and has a diameter of 6.1 cm at the larger top end. Find the gauge pressure at the bottom of the cone
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A tall, slender drinking glass with a thin base is initially empty. Where is the center of mass of the glass
A student decides to move the box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a force of 168 N at an angle of 30.0° above the horizontal. The box has a mass of 21.0 kg, and the coefficient of kinetic f..
Suppose 7.31 mol of an ideal diatomic gas, with molecular rotation but not oscillation, compute the energy transferred as heat Q
A circular saw blade rotating at 15 rev/sec is brought to a stop in 125 revolutions. what is the size of the angular acceleration experienced
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