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Liquid helium is stored at its boiling-point temperature of 4.2 Kin a spherical container (r=0.30 meter). The container is a perfect blackbody radiator. The container is surrounded by a spherical shield whose temperature is 67 K. A vacuum exists in the space between the shield and the container. The latent heat of vaporization for helium is 2.1x104 J/kg. Find what mass of liquid helium boils away through a venting valve in 1 hour?
The electric output of a power plant is 730MW . Cooling water flows through the power plant at the rate 1.30 ×108L/hr. What is the power plant's thermal efficiency
You toss a ball up in the air with an initial velocity of 8 m/s (immediately after leaving your hand). Use gravity = -9.8 m/s2. What is its acceleration at its peak height
A proton is initially at rest at a point where the potential is 507V. Sometime later the proton is at a point where the potential is 187V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy.
A storage tank at STP contains 19.1 kg of nitrogen What is the volume of the tank. What is the pressure if an additional 15.7kg of nitrogen is added without changing the temperature.
a plate carries a charge of -2.6 microc while a rod carries a charge of 2.4 microc. how many electrons must be
a cylinder of mass 10.0kg rolls without slipping on a horizontal surface.a at the instant its center of mass has a
15-kg of aluminum contains .2 kg of water. initially the water and the cup have a common temperature of 18 degrees c.
The catapult on an aircraft carrier can take an aircraft from 0 to 182 mph in 11 seconds, at which time the aircraft launches
a point charge of -2.03oc is located in the center of a spherical cavity of radius 6.52 cm inside an insulating
Calculate your apparent weight at the top and bottom of a Ferris wheel, given that the radius of the wheel is R meters, it completes one revolution every T seconds
For a particular scientific experiment, it is important to be completely isolated from any magnetic field, What is the current in the current loop
The filament of a light bulb has a temperature of 2.64 x 103 °C and radiates 60.0 W of power. The emissivity of the filament is 0.388. Find the surface area of the filament
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