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A Thermopane window of area 6.8 m2 is constructed of two layers of glass, each 5.4mm thick and separated by an air space of 2 mm. If the inside is at 12?C and the outside is at ?36?C, how much heat is lost through the window? The thermal conductivity of glass is 0.8 W/m · ? C and of air 0.0234 W/m · ? C. Answer in units of kW.
A typical photovoltaic cell delivers 4.0×10?3W of electric energy when illuminated with 0.11W of light energy. What is the efficiency of the cell
In a new (inelastic) collision, the same two bumper cars with the same initial velocities now latch together as they collide. What is the final speed of the two bumper cars after the collision
A sledge with bricks has a total mass of 180.0 kg and is pulled at a constant speed by a rope inclined at 20 degrees above the horizontal. The sledge moves a distance of 20 m on a horizontal surface.
What is the radius r of the turn if theta = 20.0 degrees (assuming the car continues in uniform circular motion around the turn).
An 8m, 200 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and ladder makes a 50.0° angle with the ground. How far up the ladder can an 800 N person climb before the ladde..
A 33.6 m length of copper wire at 23?C has aradius of 0.19 mm . The resistivity of copperis 1.7 × 10?8 ? m, determine the current in the wire
In the quark model of fundamental particles, a proton is composed of three quarks: two "up" quarks, each having charge +2e/3, calculate the potential energy of the subsystem of two "up" quarks
a 0.5 kg block of aluminum is heated to 200 degrees C. The block is then quickly placed in an air insulated tub of cold water at 0 degrees C and sealed. compute the final temperature of the water and block
What's the moxt orbital angular momentum that could be added to an atomic electron initially in the 6d state, What would be the new state
The cable below supports a unoformly distributed load. The max tension that the cable can withstand is 41 x 10^6 N, What minimum length of cable is needed
An object is placed 12.6 cm in front of the cornea. find the image distance for the image formed by the cornea alone
In the experiment, if the accelerating voltage is 300 V and the radius of the beam path is 3.2 cm, what is the Lorentz force on a single electron
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