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Why does a high-flying airplane cast little or no shadowon the ground below while a low-flying airplane casts asharp shadow?
A copper rod has a length of 1.7 m and a cross-sectional area of4.1 x10-4 m2.One end of the rod is in contact with boiling water and the other with a mixture of ice and water. What is the mass of ice per second that melts? Assume that no heat is l..
A 50 kg uniform horizontal beam of length 3.0 m is attached toa brick wall by a bracket at the wall and a cable attached to the far end that makes an angle of 60? with thehorizontal. A 75.0 kg person stands on the beam, 1 meter away from the wall.
Kim has a far point of 29 cm. If she wants to use glasses of power -3.99 D to correct her vision. How far from her eyes should the glasses be put
A diatomic gas has a volume of 2m^3, pressure of 200 kPa and atemperature of 50 degrees Celsius. The gas expands is obarically toa volume of 3m^3. What is the heat transfer into the gas?
An astronomical telescope is designed with an overall magnification of 45x. The objective has a focal length of 84.0 cm. What should be the focal length of the eyepiece
A device known as Atwood's machine consists of two masses hanging from the ends of a vertical rope that passes over a pulley. calculate the magnitude of their acceleration
Two people carry a heavy electric motor by placing it on alight board 3.00 m long. One personlifts at one end with a force of 350N, What is the weight of the motor
A horizontal wire of length 0.59 m, carrying a current of 8.1 A, is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force.
A 15-gram coin is placed on the rim of a turntable rotating at a rate of 15 RPM. The radius of the turntable is .25-meters. determine The centripetal force acting on the coin
Three parallel wires are parallel to the y-axis, and all are at z=0. The first is glued to the table top at x=0 and carries a current of 3 amps in the positive y direction. What is the initial acceleration(magnitude and direction) of the second wir..
A rotating rod that is 15.3 cm long is spun with its axisthrough one end of the rod so that the other end of the rod has aspeed of 2010m/s(4500mph). What is the centripetal acceleration of the end of the rod?
A current of 0.307 A through your chest can send your heart into fibrillation, ruining the normal rhythm of heartbeat, how many conduction electrons pass through your chest
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