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The back emf in a motor is 95 V when the motor is operating at 1000 rpm. How would you change the motor's magnetic field if you wanted to reduce the back emf to 65 V when the motor was running at 2500 rpm?
Estimate the flow rate in the channel shown in Fig. 7.19 if the slope is 0.0014. The sides are on a slope of 45o.Use the Chezy-Manning equation.
A flywheel rotates at 7200 rev/min when the power is suddenly cut off. How many revolutions does the flywheel makes before coming to rest
A 115.29 g ice cube at -11°C is placed in an aluminum cup whose initial temperature is 79°C. What is the mass of the cup
Suppose that the bike rider in problem 15 pedaled up the hilland never came to a stop. in what system is energy conserved? from what form of energy did the bike gain mechanial energy?
A student sits on a rotating stool holding two 3.6-kg objects. When his arms are extended horizontally, Find the new angular speed of the student
A 2.8 V battery is connected to a small light bulb with a resistance of 2.2 ohms. What is the current in the bulb
A solid sphere has a temperature of 628 K. The sphere is melted down and recast into a cube that has the same emissivity and emits the same radiant power as the sphere. What is the cube's temperature?
The magnetic flux that passes through one turn of a 18-turn coil of wire changes to 5.0 Wb from 14.0 Wb in a time of 0.020 s. What is the resistance of the wire
A space station is constructed in the shape of a hollow ring of mass 6.00 x 10^4 kg and radius 130 m. how much work is done to get the space station spinning
a uniform 4.5-T magentic field passes perpendiculary through the plane of a wire loop 0.10 m2 in an area. what flux passes through the loop
The drawing illustrates the dispersion of light by a prism. The prism is made from a certain type of glass, Find the angles of refraction at which the violet rays emerge into the air from the prism
In being served, a tennis ball is accelerated from rest to a speed of 48.0 m/s. The average power generated during the serve is 2920 Watt. obtain the force acting on the ball
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