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When an electric heater is turned on, the Nichrome heating element is at 0° C and draws a current of 17 A, with a potential difference of 120 V between the ends of the element. The element heats up to 785° C, with the potential difference constant. Find the final current. (The temperature coefficient of resistivity of Nichrome is 4.0 10-4 (°C)-1.)
Two particles are fixed to an x axis: particle 1 of charge -9.61 x 10-7 C is at the origin and particle 2 of charge +9.61 x 10-7 C is at x = 18.9 cm. Midway between the particles, what is the magnitude of the net electric field?
question a circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 t. the current in the loop is
A hypodermic syringe contains a medicinewith the density of water. The barrel of the syringe has across-sectional area of 2.50x10^-5 m^2. Determine the medicine flow speed through the needle
An ostrich lays the largest bird egg. A typical diameter for an ostrich egg at its widest part is 12 cm. What is the tangential speed of that part of the shell
You need to design a photodetector that can respond to the entire range of visible light. What is the maximum possible work function of the cathode
Positive charge +Q is uniformly distrubted around a quarter circle of radius R in the 1st quadrant, and negative charge -Q is uniformly distributed around a quarter circle of radius R in the 4th quadrant.
Two rockets approach earth from opposite directions at equal speeds relative to the earth. How fast are the rockets moving with respect to the earth
The water comes out of the heads at an angle of 35o to the horizontal and covers a radius of 7.0 m. What is the velocity of the water coming out of each sprinkler head
A 20-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 35 N. Starting from rest, the sled attains a speed of 2.6 m/s in 9.1 m. Find the coefficient of kinetic friction between the runners of the sled and the sn..
In a crash test a car of mass 1,864 kg collides head on with a wall with speed 12.96 m/s in the -ve x direction. The collision lasts for 0.062 s. find the average net force exerted on the car by the wall
A beam of vertically polarized light encounters two polarizing filters, as shown in the figure(Figure 1) . Calculate the transmitted intensity for each of the cases in the figure, assuming that the incident intensity is 26.5 W/m^2
Two identical diverging lenses are separated by 13 cm. The focal length of each lens is -8.4 cm. Determine the final image distance relative to the lens
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