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The amount of radiant power produced by the sun is approximately 3.9 x 1026 W. Assuming the sun to be a perfect blackbody sphere with a radius of 6.96 x 108 m, find its surface temperature (in kelvins).
A physicist uses a cylindrical metal can 0.300m high and 0.070m in diameter to store liquid helium at 4.22 K; at that temperature the heat of vaporization of helium is 2.09×104J/kg. How much helium is lost per hour
Estimate the inductance of a solenoid made by buying a typical spool of wire from hardware store and winding it carefully around a broom handle.
A large window measures 1.8m by 3.2m . At what rate will heat be conducted through the window when the room temperature is 27C and the outside temperature is 0C if the window consists of a single pane of glass 4.4mm thick. (Assume that there is a con..
A geiger counter registers a count rate of 4,000 counts per minute from sample of a radiosotope. twelveminutes later the count rate is 1000 counts per minute. what is the half-life of the radiosotope?
UV light of wavelength 211 nm falls on a silver surface whose work function is 4.74 eV. Find the maximum speed of the photoelectrons emitted from the surface
You place 73 moles of hydrogen gas in a balloon of volume 2.6 m3, and find the pressure to be 1.4 times atmospheric pressure. What is the typical speed of a hydrogen molecule?
A 4.0-m-long iron bar of uniform cross section is held perpendicular to the wall by a wire from the end of the bar to the wall as shown below. what is the magnitude of the vertical component of force produced by the wall
Two automobiles of equal mass approach an intersection. One vehicle is traveling with velocity 12.1 m/s toward the east, What was the initial speed of the northward-moving vehicle
A nail gun fires a nail into a piece of wood. The nail is going a velocity of 9.0 m/s right before entering the wood. The mass of the nail is 0.060 kg, how far into the wood does the nail go
During a severe storm in Palm Beach, Fla., on January 2, 1999, 33 inches of rain fell in a period of nine hours. estimate the average upward force exerted by one square meter of ground to stop the falling raindrops during the storm
A car is traveling at 29m/s when the driver spots a large pothole in the road the distance 37 m ahead. She immediately applies her brakes. If her acceleration is -6.60m/s2, does she manage to stop before reaching pothole.
Write the Lagrangian for a particle of mass m constrained to move on an inclined plane whose angle with respect to the horizontal is θ and derive the equation(s) of motion from Lagrange’s equation(s).
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