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A motor has coils with a resistance of 26 Ω and operates froma voltage of 240 V. When the motor is operating at its maximumspeed, the back emf is 111V.A) Find the current in the coils when the motor is first turned on. Answer in units of A.B) Find the current in the coils when the motor has reached itsmaximum speed. Answer in units of A.C) If the current in the motor is 8 A at some instant, what is theback emf at that time? Answer in units of V
A cube of ice is taken from the freezer at -7.2 ?C and placed in a 115g aluminum calorimeter filled with 318g of water at room temperature of 20.0 ? C. What was the mass of the ice cube
Vector A has components of +3 in the x-direction and -4 in the y-direction. Vector B has components -2 in the x-direction and +3 in the z-direction
A bottle has a mass of 27.00g when empty and 93.90g when filled with water. What is the specific gravity of this other fluid
A flowerpot falls off a windowsill and falls past the window below. You may ignore air resistance. It takes time 0.420s to pass this window, which is of height 1.92 m. How far is the top of the window below the windowsill from which the flowerpot ..
Light from an argon laser strikes a diffraction grating that has 5 310 grooves per centimeter. calculate vthe wavelength of the laser light
A javelin thrower releases a javelin 1.50 meters above the ground at an angle of 48.0 degrees. what was the initial velocity of the javelin
A wire that is 2.00 m long and carrying a current of 10.0 A is at right angles to a uniform magnetic field. The force acting on the wire is 0.45 N. What is the strength of the magnetic field?
A uniform ladder of length L and weight 235 N rests against a vertical wall. What is the smallest angle the ladder can make with the floor without slipping
A playground carousel is rotating counterclockwise about its center on frictionless bearings. Find the final angular speed of the carousel
An object is placed 50 cm in front of a convex mirror and its image is found to be 20 cm behind the mirror. What is the lateral magnification
A wind turbine converts some of the kinetic energy of the wind into electric energy. Suppose that the blades of a small wind turbine have length L = 3.7 m. What is the translational kinetic energy of this mass of air
Estimate how many molecules of air are in each 1.8 L breath you take that were also in the last breath Einstein took (assumed to be the same volume). (Hint: Assume the atmosphere is about 12 km high and of constant density. Take the temperature of th..
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