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a) The starter motor of a car engine draws an electric current of 42.0 A from the battery. The copper wire to the motor is 5.70 mm in diameter and 1.36 m long. The starter motor runs for 0.85 s before the car engine starts up. How much electric charge passes through the starter motor?
b) What is the current density in the wire?
Two metal spheres, each of mass 14 g and initially at rest, are dropped from a height of 6 m in an evacuated chamber. Find the difference in final speeds of the two spheres
A farsighted man uses eyeglasses with a refractive power of 1.90 diopters. Wearing the glasses 0.03 m from his eyes, What is the correct contact lens prescription, in diopters
Ilustrate what is the magnitude of the torque about his shoulder if he holds his arm in each of the following ways? Straight out to his side, parallel to the floor.
Electron acquires 5x10^-16 kinetic energy when it is accelerated by an electric field from Plate A to Plate B, what is the potential difference Vba between the two plates
Four equal charges of +4.9×10-6 C are placed on the corners of one face of a cube of edge length 7.0 cm. A charge of -4.9×10-6 C is placed at the center of the cube. What is the magnitude of the force on the charge at the center of the cube?
find the magnitude of the acceleration of the boy. Find the average magnitude of the induced emf if the change in shape occurs in 4.14 s, and the local 0.120 T magnetic field is perpendicular to the plane of the loop.
An ALkaline earth atom has 2 valance electrons. Both can be spin up and spin down. Write the singlet states
A vertically hanging steel wire has the following properties. Length=8.75m, Cross-Sectional area= 0.375 cm cubed. Y=2.10x10^11 Pa, B=1.62x10^11 Pa, S= 0.871x10^11 Pa, Proportional Limit=3.27x10^8 Pa, breaking stress=17.4x10^8 Pa.
In a defribrillator, which delivers the electric energy stored in the 175x10^-6F capacitor to restore the heart's regular beating, find the energy stored in the charged-up defribrillator
In an experiment using an inclined track with a dynamics cart, the computer failed, find the cart's acceleration, mass, and the tension in the string connecting the cart to the accelerating 50g mass
Two bars of identical mass are at 32 °C. One is made from glass and the other from another substance. The specific heat capacity of glass is 840 J/(kg · C°).
An object is placed 20.0 cm from a first converging lens of focal length 10.5 cm. Calculate the magnification of the first lens
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