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A 8.4 kg mass is attached to a light cord that passes over a massless, frictionless pulley. The other end of the cord is attached to a 3.7 kg mass. Use conservation of energy to determine the ?nal speed of the ?rst mass after it has fallen (starting from rest) 7.6 m .The acceleration of gravity is 9.8 m/s 2. Answer in units of m/s
Suppose your 50.0 mm focal length camera lens is 53.5 mm away from the film in the camera. How far away is an object that is in focus
question1a 14 g rifle bullet travelling 200 ms buries itself in a 3.5 kg pendulum hanging on a 3.3 m extended string
once upon a time, a stunt man would jump across the grand canyon a motorcycle. What minimum initial speed would be required to make across the canyon
Two spheres with uniform surface charge density, first with a radius of 7.0cm and the second with a radius of 4.8cm , What is the surface charge density on the first sphere
A ball is thrown off a cliff, 100m tall, with an initial velocity of 5m/s, How long before the ball hits the ground
An elevator at the CN Tower in Toronto, Canada, What is the minimal power required for the motor of the elevator
A cardinal (Richmondena cardinalis) of mass 3.80×10-2 kg and a baseball of mass 0.146 kg have the same kinetic energy. What is the ratio of the cardinal's magnitude p_c of momentum to magnitude p_b of the baseball's momentum.
A flywheel rotates at a rate of 20 rpm. A motor provides a constant angular acceleration so that 30 secondslater it turns at a rate of 70 rpm, what is the angular acceleration of the splotch of paint
If there is a potential difference of V between the metal and the detector, what is the minimum energy that an electron must have
As you drive by an AM radio station, you notice a sign saying that its antenna is 49 m high. what is the frequency of the station
What is the number of conduction electrons. A centrifuge rotor has a moment of inertia of 3.40 x10-2 kg·m2. How much energy is required to bring it from rest to 8000 rpm.
Two balls are moving in the same direction. Ball A has half the mass of ball B, and is moving at twice its speed. Which ball has greater kinetic energy
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