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How come in free fall you feel weightless even though gravity is pulling down on you? (ignore air resistance when answering this question).
The half life of a mystery radioactive substance is one day. If a sample of the mystery radioactive substance starts with 5 x 105 nuclei of the radioactive substance, How many nuclei are left after 200 hours
The intensity (in W/m2) of one sound is 7.12 times as great as the intensity of another sound. Relative to the quieter sound
The mass of the ball is 1.65 kg, and the mass of the block is 2.27 kg. The length of the wire is 1.23 m. What is the algebraic expression for the speed of the ball just before the collision with the block
A wind turbine is initially spinning at a constant angular speed.As the wind's strength gradually increases, What is the initial angular velocity of the turbine
car 1 weighs 4800 lbs and car 2 weighs 3900 lbs. after this accident car 1 skids for 50 feet and car 2 for 70 feet. the
A photon with energy E collides with a stationary mass m. What is the mass and speed of this particle
A child is riding a merry-go-round which completes one revolution every 8.36 s. The child is standing 4.65 m from the center of the merry-go-round. What is the magnitude of the centripetal acceleration of the child?
A 150 MW laser pulse is focused with a lens to a diameter of 4.99 ?m. What is the laser beam's electric field amplitude at the focal point
a solid sphere of radius 49 cm has a total pos- itive charge of 33.1 oc uniformly distributed throughout its volume.
A +16μC point charge and a -4μC point charge are separated with 3m. How far from the +16μC point charge, along the line joining the two charges, is the point where the net electric field is zero? (Other than at infinity)
A boy in a wheelchair (total mass 51.0 kg) has speed 1.40 m/s at the crest of a slope 2.40 m high and 12.4 m long.Find the work he did in pushing forward on his wheels
A motor (mass of 180kg) sits on a horizontal 2.25 m masslessplank. The motor is 1.00 m from one end of the plank. Find the supporting force applied at each end of the plank to keep thesystem in equilibrium
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