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A 200 watt light bulb is half a meter from a book. How much power in watts does a second light have if it produces the same light intensity at 1.5 meters?
A physics professor is pushed up a ramp inclined upward at an angle 33.0^\circ above the horizontal as he sits in his desk chair that slides on frictionless rollers. The combined mass of the professor and chair is 82.0 kg.
The first two dark fringes on one side of the central maximum in a single-slit diffraction pattern are 1.0 mm apart. What is the slit width
A motor having an efficiency of 88% operates a crane having an efficiency of 42%. With what constant speed does the crane lift a 410-kg crate of machine parts if the power supplied to the motor is 5.5 kW?
if the battery in a circuit is taken out and the current becomes zero. how does the current remain zero without the battery
A car moved 60 km East and 90 km West. What is the displacement
A husband buys a helium-filled anniversary balloon for his wife. The balloon has a volume of 4.1L in the warm store at 72deg F. By how much has the volume decreased
A coin is placed 11.0cm from the axis of a rotating turntable of varable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until arate of 36 rpm is reachedand the coin slides off.
A man applies a force of F = 3.00 102 N at an angle of 60.0° to a door, x = 2.20 m from the hinges. Find the torque on the door
You're a production engineer in a cookie factory, where mounds of dough drop vertically onto a conveyer belt at the rate of one 11g mound every 2 seconds, What average force must the mechanism exert on the belt
An unknown capacitor is charged by a 100-V source through a 1 M? resistor. determine the capacitance of the capacitor
a geologist is camped 8,000 m from a volcano as it erupts. how much time elapses before the geologist the sound from the eruption
A 2-kg book with no initial velocity slides down an inclined plane with an angle of 20 degrees a total of 2 meters. The force of friction does 10 Joules of work, what is the final kinetic energy of the system as the book reaches the bottom of the ..
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