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1. Describe how an alternating generator works.
2. When an electric motor is operated at 1600 rpm the counter emf is 94V. What would the counter emf be if its speed were increased to 1800 rpm.
3. The magnetic field of a certain motor is produced by solenoids whose windings are connected in parallel with the armature across the same potential difference of 115V. The coils have a resistance of 60.0 ohms and the armature a resistance of 4.0 ohms. When the motor is running at full speed, the back emf is 105 V.
a) What is the total current drawn by the motor when it is running at full speed?
b) What is the total current drawn by the motor when it is running at full speed?
c) What is the total current drawn by the motor when it is running at half speed?
A rocket blasts off and moves straight upward from the launch pad with a constant acceleration. After 3.0 seconds the rocket is at a height of 77 m. what is its the speed at this time
A boy stands on a diving board and tosses a stone into a swimming pool. How much time elapses between when the stone is thrown and when it strikes the bottom of the pool
four charges, q1=1.5 nC, q2=4nC, q3=20nC and q4=-1nC are placed so that q4=(0,0) q1 is north of q4 and .5m away q2 is east of q4 and 1.0m away q3 is SW of q4 at angle of 36.9 degrees
If all three of the following have the same mass and radius, which requires the most work to get spinning with the same angular speed w
A diffraction grating with d = 2000 nanometers is used with a mercury discharge tube. Find the distance from the slit to the first-order image for the blue-green wavelength of mercury
The resistance and the magnitude of the current depend on the path that the current takes. Find the current in each case
A lowly high diver pushes off horizontally by a speed of 2.77 m/s from the edge of a platform that is 10.0 m above the surface of the water. (a) At what horizontal distance from the edge of the platform is the diver 0.885 s after pushing off?
0.800 x 1010 photons pass through an experimental apparatus. How many of them land in a 0.140-mm-wide strip where the probability density is 15.0 m-1
A bat flying toward an obstacle at 9 m/s emits brief, high-frequency sound pulses at a repetition frequency of 83 Hz. What is the time interval between the echo pulses heard by the bat? in milliseconds
A real object is placed at the zero end of a meterstick. A large concave mirror at the 100 cm end of the meterstick forms an image of the object at the 70.0cm position. A small convex mirror placed at the 20 cm position forms a final image at the ..
A screen is placed 43.9 cm from a single slit, which is illuminated with light of wavelength 672 nm. what is the width of the slit
A step-down transformer has a turns ratio of 1:10, and its primary is connected across the terminals of a standard 120-V wall socket. What power P is dissipated in the resistor
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