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A typical lightbulb in your house is rated 137 W, which means that the lightbulb dissipates 137 W when connected to a DC voltage of 110V.
(a) What is the current?
____________________ A
(b) If the voltage is reduced to 54.8 V, what is the dissipated power?
____________________ W
A small conducting spherical shell withinner radius a and outer radius b is concentric with a larger conducting spherical shell with inner radius c and outer radiusd, calculate the electric field (magnitude and direction) in termsof..
An airtight box has a removable lid of area 1.00 10-2 m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 7.00 104 Pa. The inside of the box is completely displaced. What is the magnitude of the force es..
a box sits on a horizontal wooden board. the coefficient of static friction between the box and the board is 0.25. you grab one end of the board and lift it up, keeping the other end of the board on the ground. what is the angle between the board ..
Use the binomial expansion to find an approximate expression
Radioactive isotopes often occur together in mixtures. assume a 480 sample contains , with a half-life of 12 days, and , with a half-life of 4.5 days.
A 120-V motor has mechanical power output of 3.00 hp. It is 88.0% efficient in converting power that it takes in by electrical transmission into mechanical power. Find the current in the motor
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1040 Hz, What is the speed of the bird, expressed as a percentage of the speed of sound
Tension is maintained in a string as in the figure below. What is the mass per unit length of the string
A handball of mass 0.10 kg, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19m/s. What is the change in the momentum of the ball.
A loaded ore car has a mass of 935 kg and rolls on rails with negligible friction. What maximum power must the winch motor provide
A projectile is projected from the origin with a velocity of 25.0 m/s at an angle of 50.0 degrees above the horizontal. What is the time of maximum height of the projectile? A.)2.03 s B.)3.45 s C.)1.95 s D.)2.67 s E.)3.01 s
A ship's mast reaches to a height of 15 meters above the surface of a 10-meter- deep lake. When the sun is 30 degrees above the horizon, how long will the shadow of the mast be on the bottom of the lake?
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