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A tungsten wire has a radius of 0.070 mm and is heated from 20.0 to 1330 oC. The temperature coefficient of resistivity is ? = 4.5 x 10-3 (Co)-1. When 170 V is applied across the ends of the hot wire, a current of 2.0 A is produced. How long is the wire? Neglect any effects due to thermal expansion of the wire.
A 2.50mL syringe has an inner diameter of 6.00mm , a needle inner diameter of 0.290mm , and a plunger pad diameter of 1.2 cm, What is the minimum force the nurse needs to apply to the syringe
A steel wire of length 1.97m with circular cross section must stretch no more than 0.270cm, What minimum diameter dmin is required for the wire
pipe open at one end only has a fundamental frequency of 237 Hz. A second pipe, initially identical to the first pipe, is shortened by cutting off a portion of the open end. Currently, when both pipes vibrate at their fundamental frequencies, a beat ..
A spherical shell of radius R = 8.0 cm has a total charge Q = - 900nC uniformly distributed on its surface, Write the net electric field at the point P in unit vector notation
A ball dropped from 50 cm rebounds to a height of 33cm. Find the fraction of the original energy lost
Monochromatic light ( = 630 nm) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.20 m from the slits. It shows the interference pattern observed on the screen. What is the slit separatio..
What is the length of the greatest and thinnest string that can be located under a tension of 860 without breaking .
A horizontal board weighing 198 N is supported at points A and B. The plank serves as a platform for a painter, who weighs 558.5 N. Find out the maximum distance D, such that the plank would not tip, no matter where the painter stands.
A barbell spins around a pivot at its center at A. The barbell consists of two small balls, each with mass 400 grams (0.4 kg), at ends of a very low mass rod of length d = .6 m. The barbell spins clockwise with angular speed 20 radians/s.
A 51kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 250N. For the first 10.5m the floor is frictionless, and for the next 10.5m the coefficient of friction is 0.18. What is the final speed of the crate af..
In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.0618 s, during which time it experiences an acceleration of 326 m/s2. The ball is launched at an angle of 57.3° above the ground. Determine..
A Physicist must determine the mass = m of a block of a wood without a scale. He pulls the block of wood up a ramp angle = 30 degreesusing a rope. find the mass of the block
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