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A copper bar 2.5 m long has a circular cross section of radius 2 cm. One end is kept at 80 oC and the other end is kept at 0 oC. The surface of the bar is insulated so that there is negligible heat loss through it. If kcopper = 401 W.m-1.K-1, what is the thermal current in the copper bar?
Two cylinders of the same material and length, are held horizontally one atop the other with space in between so they are not touching.. Viewed from the end they look like two circles on top of each other with space between(looks like a lower case..
Each croquet ball in a set has a mass of .50kg. The green ball travels at 10.5m/s and strikes a stationary red ball. what is the final speed of the red ball after the collision
A solid concrete block weighs 250 N and is resting on the ground. Its dimensions are 0.400 m x 0.190 m x 0.0880 m. What is the smallest number of whole bricks
Two identical point charges are fixed to diagonally opposite corners of a square that is 0.420 m on a side. How much work is done by the electric force
an airplane pilot wishes to fly directly westward. according to the weather bureau a wind of 75.0 kmh is blowing
A cone has radius R = 30.0 cm and is on a horizontal table. The angle formed by the height and side at the vertex = 60.0°. What is the magnitude of the net flux that enters the cone
Drawing on Eratoshthenes' method, if two observers are due north and south of each other and are separated by 400 km, what is circumference of their spherical world if they see the similar star on their meridian at altitudes of 23degrees and 47deg..
If the electric field at a point in space has a manitude of300 volts/meter, about how far apart are the equipopoetnial surfaces that differ by 10 volts?
A 60.0 g mass is attached to the bottom of a vertical spring and set vibrating. Find the frequency of oscillation
If we drop a small metal sphere into the water and watch its motion, it will quickly reach terminal velocity. what is the Reynold's number of this sphere
If the wire is heated to 36.0°C while the 7.0-V potential difference is maintained, what is the resulting current in the wire
question two ocean liners with a mass of 50000 metric tons are 50 m apart. what is the magnitude of the acceleration of
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