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A 660 kg elevator starts from rest. It moves upward for 3.25 s with constant acceleration until it reaches its cruising speed, 1.82 m/s. What is the average power of the elevator motor during this period?
Radioactive decay of granite and other rocks in the Earth's interior provides sufficient energy to keep the interior molten, heat lava, and supply warmth to natural hot springs.
A wooden raft has a mass of 67 kg. When empty it floats in water (density 1000 kg/m3) with 51 percent of its volume submerged. What mass of sand can be put on the raft without it sinking.
A rubber ball of mass 149 g is thrown directly at a wall with a speed of 4.7 m/s. what is the magnitude of the impulse imparted by the wall on the ball
An electron that has velocity vector v = (3.4 106 m/s) i hat + (2.9 106 m/s) j hat moves through a magnetic field vector B = (0.03 T) i hat - (0.15 T) j hat. Find the force on the electron
A rock is suspended from the string and moves downward at constant speed. Which statement is true concerning the tension in the string if air resistance is ignored.
For a particular RLC series circuit, the capacitive reactance is 4.15 ?, the inductive reactance is 47.1 ?, What is the maximum voltage across the circuit
You pull a 12 kg sled across the floor with a strap that is at an angle of 31° above the horizontal with a force 76 N. Determine the magnitude of the acceleration of the sled, given that the coefficient of kinetic friction between the suitcase an..
A friend of yours is loudly singing a single note at 410 Hz when racing toward you at 26.1 m/s on a day when the speed of sound is 339 m/s. What frequency does your friend hear if you suddenly start singing at 410 Hz.
A high-speed photograph of a club hitting a golf ball is shown in the figure below. find the average force exerted on the ball by the club
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 12.0 cm, find the electric field just inside the paint layer
A 0.2 object is swung in a vertical circular path on a string 0.1 m long. The acceleration of gravity is 9.8 m/s^2. If a constant speed of 4.07 m/s is maintained, what is hte tension in string when the object is at the top of the circle? Answer in..
A boy on board a cruise ship drops a 30.0 g marble into the ocean. what is the terminal speed of the marble
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