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A visitor to a lighthouse wishes to determine the height of the tower. She ties a spool of thread to a small rock to make a simple pendulum, which she hangs down the center of a spiral staircase of the tower. The period of oscillation is 8.29 s. What is the height of the tower?
A 63 ohms resistor, an 8.4 uF capacitor, and a 36 mH inductor are connected in series in an ac circuit. Calculate the impedance for a source frequency of 300Hz
A banked curve has been designed so that it is safest for a vehicle going 70mph. A 5512 lb vehicle travels with a speed of 60 mph on the curve. Calculate the force that the road exerts on the vehicle
The maximum angular magnification of a magnifying glass is 12.0 when a person uses it who has a near point that is 25.0 cm from his eyes. Obtain the focal length of the objective
A block rests on a horizontal surface, and the coefficient of static friction between the block, Find the frequency at which the block begins to slide on the surface
One end of a brass bar is maintained at 298°C, while the other end is kept at a constant but lower temperature. What is the temperature of the bar at a point 0.24 m from the hot end
An electron in a hydrogen atom is orbiting the nucleus at 2.2x106 m/s. If we treat the electron as a classical current loop orbiting the nucleus
A 23 bullet traveling 240 penetrates a 4 block of wood and emerges going 170. If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges.
A square plate of copper with 55.0 cm sides has no net charge and is placed in a region of uniform electric field of 83.0 kN/C directed perpendicularly to the plate. Find the charge density of each face of the plate
You look through a Polaroid sheet at a 75 W light bulb 3.00 m away. Find the intensity of the light you see
A discus thrower changes his angular velocity from 280°/s to 400°/s (at the time of release) in 1.5 sec. find the average angular and linear acceleration
A pilot wishes to fly due east. If the planes maximum speed is 683 km/hr and there is a 21.4 km/hr wind from the north, what must the planes velocity be in order to fly due east
A therapist examines the range of motion of an athlete's knee joint. What was the angular displacement of the lower leg from full extension to full flexion
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