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A dc motor is connected to a constant emf of 16.9 V. The resistance of its windings is 2.0 ?. At normal operating speed, the motor delivers 7.1 W of mechanical power. (a) What is the initial current drawn by the motor when it is first started up? (b) What current does it draw at normal operating speed? (c) What is the back emf induced in the windings at normal speed?
Your little brother is sitting in a wagon playing with his toys. what was the velocity of the football when you threw it towards your brother
You have decided to make a large cooler to store meat. Calculate the net rate of heat flow per second out of the cooler if the interior temperature is 5 C and the exterior temperature can be 45 C
On aircraft carriers, catapults are used to accelerate jet aircraft to flight speeds in a short distance. What is the acceleration of the jet in m/s2
Please solve this problem for me: A large cruise ship of mass 7.00 107 kg has a speed of 10.0 m/s at some instant. How much work is required to stop it
When one person shouts at a football game, the sound intensity level at the center of the field is 60.0 dB. how many people are at the game
The work function for cesium, 1.81 eV, is much lower than the work function for other metals. What is the maximum electron kinetic energy when cesium is illuminated with light of 512-nm wavelength
An Argon ion laser has a gain bandwidth of 2 GHz. Find the number of standing wave cavity modes within the gain bandwidth of the argon ion laser
q1. an antelope moving with constant acceleration covers the distance 79.0 m between two points in time 6.70 s. its
An object that hangs form the ceiling of a staionary elevator by an ideal spring scilliates with a period T. If the elevator accelerates upward 2g , what will the period of oscillation of the object ?
A 0.410 kg pendulum bob passes through the lowest part of its path at a speed of 3.13 m/s. What is the tension in the pendulum cable at this point if the pendulum is 76.2 cm long.
A cell membrane is composed of lipid molecules and approximately 10.48 nm thick. If the dielectric constant of the lipid is k = 5, what is the approximate capacitance of a spherical cell that has a diameter of 10.48 mu m?
A string of length L, which is clamped at both ends and has a tension T, is pulled aside a distance h at its center and released
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