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A motor is designed to operate on 117 V and draws a current of 15.0 A when it first starts up. At its normal operating speed, the motor draws a current of 2.55 A. Obtain
(a) the resistance of the armature coil,
(b) the back emf developed at normal speed, and
(c) the current drawn by the motor at one-third normal speed.
A snowboarder of mass 73 kg slides down the trail shown in the figure below. The first part of the trail is a ramp that makes an angle of 29° with the horizontal, Find the work done by gravity on the snowboarder
A 600 turn solenoid, 25 cm long, has a diameter of 2.3 cm. A 10 turn coil is wound tightly around the center of the solenoid. If the current in the solenoid increases uniformly from 0 to 5.0 A in 0.55 s, what would be the induced emf magnitude in t..
If 80g of ice at -20 oC is placed in 200g of water at 15 oC, how much ice melts, The specific heat of ice is 0.5 cal/g-K
If the frequencies are swept over a plusminus.gif2.00% range centered on 86.0 MHz, what is the range of wavelengths broadcast
A goose flying toward you at 11.4m/s emits a squawk, which you hear at 262Hz, Find the wavelength of the sound you hear
A man strides across a bed of embers. Assume the glowing charcoal is covered with a thin layer of ash 0.50 mm thick and is at a temperature of 650C. The thermal conductiviity of ash and charcoal is 1.5 W/ (mxK). (a) Estimate the heat transferred t..
A stone is dropped into a river from a bridge 43.90 m above the water. Another stone is thrown vertically down 1.00 after the first is dropped. The stones strike the water at the same time.
Two cars collide head on while each is traveling at 90. What is the temperature increase of each car
An electron initially at rest is accelerated between two parallel plate 2.000 cm apart, What kinetic energy does the electron have when it hits the positive plate
A paperweight, when weighed in air, has a weight of W = 7.3 N. When completely immersed in water, Find the volume of the paperweight
A common flashlight bulb is rated at 0.300 A and 2.80 V (the values of the current and voltage under operating conditions). what is the temperature of the filament when the bulb is on
Two concentric spheres of radii a and b> a have equal and oppposite charge Q when the potential diffrence between them is V. What is the capacitance of the spheres
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