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In a photoelectric-effect experiment, the wavelength of light shining on an aluminum cathode is decreased from 249nm to 207nm .
What is the change in the stopping potential?
delta V_stop = ______________ V
A fly appears to be upside down and 3 times its actual size when viewed through a converging lens with a focal length of 14 cm. How far is the fly from the lens
A man pushes a lawn mower on a level lawn with a force of 186 N. If 35 percent of this force is directed downward, how much work is completed by the man in pushing the mower 6.5 m.
An AM radio transmitter broadcasts 47.0 kW of power uniformly in all directions, What is the maximum electric field strength at this distance
A 37.8 kg box initially at rest is pushed 5.27 m along a rough, horizontal floor with a constant applied horizontal force of 81.3836 N. Find the work done by the friction
A worker stands still on a roof sloped at an angle of 23° above the horizontal. He is prevented from slipping by a static frictional force of 540 N. Find out the mass of the worker.
An earthquake emits both P-waves and S-waves that travel at different speeds through the Earth. how far is the station from the earthquake center
It is possible to make a thermometer by sealing gas in a rigid container and measuring the absolute pressure. What is the temperature of this sample
Solar Radiation is incident on the surface of the Earth at an average of 1000 W/m^2. This is measured on a surface which is perpendicular to the incoming light
A 300-g aluminum cup contains 1000 g of water in thermal equilibrium with the cup at 65°C. At what rate is energy being removed
If in general R were calculated as R=V/I, which curcuit arrangement in part A of experiment would have the smalles ERROR? define.
Helium forms a solid at low temperatures and high pressures. To maintain the order present in a solid, each atom must remain at its assigned position, Find the uncertainty in momentum of the helium atom
Illustrate what minimum speed will allow the ball to clear the roof?at what angle should the ball be tossed. (in picture at roof starts at 3m and the angle of the roof there is 45degrees
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