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Two cylindrical bars, each with diameter of 2.40 cm, are welded together end-to-end. One of the original bars is copper and is 0.350 m long. The other bar is gold and is 0.135 m long. What is the resistance between the ends of the welded bar at 20 oC ?
A 2 kg mass passes through the origin (x=0) with initial velocity -3m/s to the left on a horizontal frictionless table, Find the values of x which the mass has zero acceleration
A 10-cm-long nichrome wire is connected across the terminals of a 1.5 V battery. What is the current density inside the wire
A small piece of dust of mass m = 1.0 µg travels through an electric air cleaner in which the electric field is 500 N/C, What is the charge on the dust particle
Insects do not have lungs as we do, nor do they breathe through their mouths. Instead, they have a system of tiny tubes, called tracheae, through which oxygen diffuses into their bodies. find the oxygen concentration at the interior end of the tube
What is the linear speed of the phonograph needle
Speedboat A negotiates a curve whose radius is 115 m. Speedboat B negotiates a curve whose radius is 194 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of boats.
A 5-kg bowling ball (solid sphere, ) with a diameter of 22 cm is rolling without slipping on a smooth, level surface with a speed of 7.0 m/s. What is the ball's angular momentum
A skydiver of mass 80.5 kg jumps from a slow-moving aircraft and reaches a terminal speed of 50.7 m/s. What is the drag force on the skydiver when her speed is 50.7 m/s
A 210g , 30.0-cm-diameter turntable rotates on frictionless bearings at 61.0rpm. What is the turntable's rotation angular velocity when the block reaches the outer edge
A woman stands in a elevator that has a constant acelerationwhile the elevator travel upward a distance of 18.0 m. what is the mass of the woman
question1a gun shoots bullets that leave the muzzle with a speed of 239. if a bullet is to hit a target 111 away at the
Adjacent antinodes of a standing wave on a string are 15.0cm apart. A particle at an antinode oscillates in simple harmonic motion with amplitude 0.850 cm and period 0.0750 s.
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