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A tungsten wire has a radius of 0.086 mm and is heated from 20.0 to 1422 oC. The temperature coefficient of resistivity is ? = 4.5 x 10-3(Co)-1. When 130 V is applied across the ends of the hot wire, a current of 1.2 A is produced. How long is the wire? Neglect any effects due to thermal expansion of the wire.
Find out the height from which you would have to drop a ball so that it would have a speed of 9.7 m/s just before it hits the ground.
A doubly charged helium atom whose mass is 6.6 10 to 27 kg is accelerated by a voltage of 2200 V. What will be its radius of curvature if it moves in the plane perpendicular to a uniform 0.308 T field?
In the Atwood machine shown below, m1 = 2.00 kg and m2 = 5.50 kg, How far will m1 descend below its initial level and Find the velocity of m1 after 1.80 s
A 2 kg projectile is fired with an initial speed of 135 m/s at an angle of 68° with the horizontal. At the top of its trajectory, the projectile explodes into two fragments of masses 0.72 kg and 1.28 kg. At 3.8 s after the explosion, the 1.28 kg f..
Four 6.50 kg spheres are located at the corners of a square of side 0.68 m. Calculate the magnitude and direction of the total gravitational force exerted on one sphere by the other three.
A bead with a mass of 0.083 g and a charge of 15 nC is free to slide on a vertical rod. At the base of the rod is a fixed 10nC charge. In stability, at what height above the fixed charge does the bead rest.
What is the maximum speed the car can have at point B for the gravitational force to hold it on the track.
(a) What is the velocity of the boat at t = 18.89 s? (b) Find the total displacement of the boat.
A prescription for a corrective lens calls for +1.50D. The lensmaker grinds the lens from a "blank" with n = 1.56 and a preformed convex front surface of radius of curvature of 40.0 cm. What should be the radius of curvature of the other surface?
A spool of thin wire (with inner radius r = 0.50 m, outer radius R = 0.65 m, and moment of inertia I_cm = 1.1323 kg*m2) pivots on a shaft.
A 40g block of ice is cooled to -78 deg celcius and is then added to 560g of water in an 80g copper calorimeter at a temperature of 25 degrees celcius, determine how much ice is left
A woman is riding a Jet Ski at a speed of 28.8 m/s and notices a seawall straight ahead, what is the minimum distance from the seawall that she can begin making her turn and still avoid a crash
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