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The potential difference across the filament of a light bulb is kept constant while the filament heats up to its final equilibrium temperature. The current in the filament drops to a tenth of its original value at room temperature. If the temperature coefficient of resistivity of the filament is 0.0045 (oC)-1 and the resistivity increases linearly with temperature, find the final temperature of the filament.
Bob takes off for a planet that is 100 LY away moving in a rocket ship at .9999c relative to Earth when he is 10 years old. How old is Bob (in years) when he arrives
A very narrow hole is drilled all the way through the Earth (through its center) and evacuated (i.e. there is neither air resistance nor friction). A small object of mass m is dropped into the hole at the surface.
A worker drives a 0.500 kg spike into a rail tie by a 2.50kg sledgehammer. The hammer hits the spike with a speed of 65.0m/s. If one-third of the hammer's kinetic energy is converted to the internal energy of the spike and hammer, how much does the t..
A person with perfect pitch sits on a bus bench listening to the 451 Hz horn of an approaching car. If the person detects a frequency of 486 Hz, how fast is the car moving
A long solenoid has 1400 turns per meter of length, and it carries a current of 3.5 A. Find the torque exerted on the coil
A parallel-plate capacitor with circular plates of radius 80 mm is being discharged by a current of 7.0 A. At what radius (a) inside and (b) outside the capacitor gap is the magnitude of the induced magnetic field equal to 70% of its maximum value? (..
A 75- kg child sits in a swing suspended with 3.2- m-long ropes. Use conservation of energy to determine the speed the child will have at the bottom of the arc when she is let go
If the baseball exerts the force of 464N on the glove such that the glove is displaced 5.9 cm, how much work is done by the ball.
When the bulb of a constant-volume gas thermometer is placed in a beaker of boiling water at 100 oC, the pressure of the gas is 229 mmHg . When the bulb is moved to an ice-salt mixture, the pressure of the gas drops to 161 mmHg . Assuming ideal beh..
The intensity of light from a 100-watt light bulb is about 1 =32/ad2. Find an expression for the sum of intensities of light from a 100-watt bulb and a 60-watt bulb.
generator has a terminal voltage of 115 V when it delivers 18.0 A, alculate the emf (e m f) and the internal resistance (r) of the generator
A 0.30 kg puck, initially at rest on a frictionless horizontal surface, is struck by a 0.20 kg puck that is initially moving along the x axis with a velocity of 1.8 m/s. Find the fraction of kinetic energy lost in the collision
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