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The thermal conductivity of concrete is 0.80 W/m- C*, and the thermal conductivity of a certain wood is 0.10 W/m- C*. How thick would a solid concrete wall have to be to have the same rate of heat flow as an 8.0-cm-thick solid wall of this wood? Both walls have the same surface area.
A double convex thin glass lens has equal radii of curvature. Find the radius of curvature of each convex surface
At a time t = 3.40s , a point on the rim of a wheel with a radius of 0.210m has a tangential speed of 53.0m/s as the wheel slows down with a tangential acceleration of constant magnitude 11.0m/s2. Calculate the wheel's constant angular accelerat..
The maximum speed of a 3.7-kg mass attached to a spring is 0.67 m/s , and the maximum force exerted on the mass is 12 N. What is the amplitude of motion for this mass? What is the force constant of the spring?
As you finish listening to your favorite compact disc (CD),the CD in the player slows down to a stop. Assume that the CD spinsdown with a constant angular acceleration. *If the CD rotates at 500 rpm (rev
A bullet is fired through a board 10.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of the board. Find the total time the bullet is in contact with the board
A kaon is moving in the +x direction decays by this process, where that pi^+ is moving off at a speed of 0.9c in the +x-direction, determine the speed of the kaon before the decay
Blocks with masses of 2.0 , 4.0 , and 6.0 are lined up in a row on a frictionless table. All three are pushed forward by a 57 N force applied to the 2kg block.How much force does the 4 block exert on the 6.0 block.
two guns a and b located at xa 0 and xb 1.5 km fire at an approaching rocket. gun a fires at t 0 gun b fires at t
An object is 23.0cm from the center of a silvered spherical glass Christmas tree ornament 6.50cm in diameter. What is the magnification of its image
A 48 kg ice skater is gliding along the ice, heading due north at 5.0 m/s. The ice has a small coefficient of static friction, to prevent the skater from slipping sideways, however µk=0. abruptly, a wind from the northeast exerts a force of 4.0 N on ..
A series ac circuit consists of a voltage source of frequency f=60 Hz and source voltage amplitude 345 volts, a resistor of resistance R=335 ohms, what is the current amplitude in the circuit
two 28.0 kg ice sleds that are placed a short distance apart, one directly behind the other. What are the final speeds of the two sleds
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