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When armature is rotated by half revolution, its magnetic polarity changes. Why is it necessary to change the polarity of armature magnet? Explain how does the change take place?
An aluminum block (c=0.22 kcal/kgoC) of mass 1 kg and temperature 964oC is dropped into 11 liters of water at 26 oC. What is the final temperature of the water and aluminum
A 14.0 capacitor and a 5.50 inductor are connected in series with an open switch. The capacitor is initially charged to 6.70 What is the angular frequency of the charge oscillations
an electron is a subatomic particle m 9.11 x 10-31 kg that is subject to electric forces. an electron moving in the x
q1. an aluminium block of mass m1 3 kg and a copper block of mass m2 8 kg are connected by a light string over a
John, a 76-year-old grandfather, had been smoking heavily for 26 years and had a persistent cough. A biopsy of his lung tissue revealed considerable amounts of carbon particles. How might this happen considering the natural cleaning mechanism of the ..
A 37 g bullet, with ahorizontal velocity of 494 m/s, stops13 cm within a solid wall. What is the change in its mechanical energy
The average density of the material in intergalactic space is approximately 2.5 x 10-27 kg/m3. Determine the volume of a gold sample
A light bulb is connected to a 120.0-V wall socket. The current in the bulb depends on the time t according to the relation I = (0.839 A) sin [(204 Hz)t]. Determine the resistance of the bulb's filament
In a steam turbine, steam is flowing at 20kg/s. At the inlet of the turbine, specific enthalpy is 2800kJ/kg, velocity 20m/s and heigh is 2m. Obtain the turbine output power
A satellite is circling a small planet at a speed of 3.60 rev/day. If the satellite's orbit has a diameter of 30,000 km, how fast is the satellite moving
A 0.590-kg slab of granite isheated so that its temperature increases by 7.10° C. what is the specific heat of granite
A cart loaded with bricks has atotal mass of 23.8 kg and is pulled at constant speed by a rope. The rope isinclined at 21.6 ? abovethe horizontal and the cart moves 15.1 m on a horizontal floor.
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