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A coil has an inductance of 7.0 mH, and the current in it changes from 0.16 A to 1 A in 0.15 s. Discover the magnitude of the average induced emf in the coil during this period.
two small plastic spheres each have a mass of 2.0 g and a charge of -50.0 nc. they are placed 2.0 cm apart.what is the
A .250 kg ball is dropped from a height of 10.0 cm onto a spring, as illustrated. If the spring has a spring constant of 60.0 N/m , how high will the ball go
A bat crashes into the vertical front of an accelerating subway train. what is the minimum acceleration of the train
A sled weighing 61.0 N is pulled horizontally across snow so that the coefficient of kinetic friction between sled and snow is 0.100. A penguin weighing 67.0 N rides on the sled, as in the figure below. If the coefficient of static friction between p..
A current of 48.6 mA exists in a wire for 1.20 minutes. What is the rate that charge passes a point in the wire
A step-up transformer increases 18V to 120V. What is the current in the secondary coil as compared to the primary coil? Assume 100% efficiency
An oil droplet with 13.0 excess electrons is observed between two parallel electrodes spaced 11.0mm apart. What is the radius of the droplet
At the equator, the earth's magnetic field is approximately horizontal and is directed toward the north and has a value of 8 * 10^-5 T. What is the emf if the bullet travels south
A child playing tee ball hits a stationary 65 g ball with a 200 g bat swinging initially at 4.0 m/s. What's the bat's post-impact speed
To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) as highspeed. What was the raven's speed right after the collision
a steel rod 2.00 m long is to be used to pry up one end of a 400-kg crate. if a workman can exert a downward force of
A charge of -16 x 10 ^-6 C , Q1, is fixed on x axis at 4 m and a charge of + 9x 10^-6, Q2, is fixed at +3 m on y axis Show E1 and E2 vector due to each charge, Calculate electric potential V at origin
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