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A D-cell of the type utilized in flashlights can supply a half mole of electrons to an external circuit before all of its stored chemical energy has been dissipated. (One mole =6.02*1023 particle,) If this cell is connected to a small lamp of the kind used in our second lab experiment, the electron current in the bulb will be 2.40*1018 electrons per second. Compute the number of hours the bulb will remain lit.
Assume the light bulb in Figure 22.4b is replaced by a6.0Ω electric heater that consumes 15 W of power. The conducting bar moves to the right at a constant speed, the field strength is 2.4 T, and the length of the bar between the rails is1.2m.
the entrance to a large lecture room consists of two side-by-side doors one hinged on the left and the other hinged on
To clear the net, the ball must rise at least 0.294 m. If the ball just clears the net at the apex of its trajectory, explain how fast was the ball moving when it left the racquet?
the displacement of a wave traveling in the negative y-direction is dyt 5.00cm sin 6.50 y 60.0 t where y is in m
The fresh water behind a reservoir dam is 15.0 m deep. A horizontal pipe 3.00 cm in diameter passes through the dam 8.0 m below the water surface, What volume of water flows out of the pipe
An empty rubber balloon has a mass of 0.0109 kg . The balloon is filled with helium at a density of 0.178 kg/m3. what is the tension in the line
A 650 kg elevator starts from rest. It moves upward for 3.50 s with stable acceleration until it reaches its cruising speed 1.75 m/s. Calculate average power of elevator motor during this period
Explain an experimental method for determining the center of mass of any object, including irregularly shaped objects.
A wooden pole is 4.00m long , weighs 315 N , and has its centerof gravity 1.50m from one end. What force is needed to lift each end
Nitromethane CH3NO2) burns in air to produce significant amounts of heat. How much heat is produced by the complete rection of 6.66kg of Nitromethane
Two railroad freight cars with masses 110 Mg and 140 Mg approach with equal speeds of 0.350 m/s. They collide, the lighter car rebounding opposite its original direction at 0.330 m/s.
A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternative t..
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