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On a humid day, an electric field of 2.00 * 10^4 N/C is enough to produce sparks about an inch long. Suppose that in your physics class, a van de Graaff generator with a sphere radius of 15.0cm is producing sparks 6 inches long. a) Use Gauss's law to calculate the amount of charge stored on the surface of the sphere before you bravely discharge it with your hand. b) Assume all the charge is concentrated at the center of the sphere, and use Coulomb's law to calculate the electric field at the surface of the sphere.
A 5 kg box rests on a table. Amassless string in attached to the box and is hung over a massless, frictionless pulley. find the force that the table exerts on the box
A bat at rest sends out ultrasonic sound waves at 50.5 kHz and receives them returned from an object moving directly away from it at 30.5 m/s
A 80 kg diver steps off a 13 m tower and drops from rest straight down into the water. If he comes to rest 4.1 m beneath the surface, find out the average resistance force exerted on him by the water.
A cube of ice is taken from the freezer at -8.4 and placed in a 104 aluminium calorimeter filled with 322 of water at room temperature of 20. The final situation is observed to be all water at 17.
A dentist's drill starts from rest. After 3.30 s of constant angular acceleration it turns at a rate of 2.8 x 10^4 rev/min, Determine the angle (in radians) through which the drill rotates during this period
A 290 g piece of iron at 180 oC is placed in a 95 g aluminum calorimeter cup containing 250 g of glycerin at 10 oC. What is the specific heat of glycerin
For an atom (mythical), there are three possible energy levels between which an electron can jump
George just graduated from college and is going on his first job interview. He has learned that there are two other candidates. Because of the information he has learned about the serial position effect, George asks to be either the first or the last..
True false questions on physics
The speed of light in a material is 0.52×c. What is the critical angle (in degrees) of a light ray at the interface between the material and a vacuum
The box is taken up a mountain where the air pressure outside the box is 8.00 104 Pa. The inside of the box is completely evacuated. Elucidate the magnitude of the force required to pull the lid off the box?
How much energy is lost through the walls of the hot water heater in one week? (Assume thinner surface of the heater is 90 C and the outer surface is 27 C.)
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