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The ideal battery has emf = 57 V, the resistances are R1 = 29 kΩ and R2 = 10 kΩ, and the capacitor is uncharged. When the switch is closed at time t = 0, what is the current in (a) resistance 1 and (b) resistance 2? (c) A long time later, what is the current in resistance 2?
An object of height 10 cm is placed 50 cm in front of a bi-convex lens with a focal length of 20 cm. Which of the following is true about the image?
In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. Find the force acting on the electron as it revolves in a circular orbit of radius 5.34 10-11 m
a ferromagnetic material has a relative permeability of 2.87 atilde- 104. find the magnitude of the magnetic dipole
In which of the following situations could total internal reflection occur? Choose all that apply. Going from crystalline quartz to fused quartz. Going from oxygen to carbon disulfide.
Four ropes, all at right angles to each other, pull on a ring. the force N, W; and D= 20N, S. Find the resultant direction of force on the ring
An ideal gas is compressed at constant pressure to one-half its initial volume. a)If the pressure of the gas is 150kPa , and 770J of work is done on it, find the initial volume of the gas.
A light ray in the air is incident on the water 60^circ from the normal. Illustrate what is the ray's direction of travel in the glass?
The current supplied by a battery in a portable device is typically 0.131 A. Find the number of electrons passing through the device
You are standing 4.5m from a convex security mirror in a store. You estimate the height of your image to be half of your actual height. Estimate the radius of curvature of the mirror
A thin glass rod is bent into a semicircle of radius r=5cm. A charge of +q = 4.5 pC is uniformly distributed along the upper quadrant and -q = -4.5 pC along the lower quadrant. What is the magnitude and direction of the electric field at P, the cen..
A dog running in an open field has components of velocity v_x = 3.2 m/s and v_y = -2.1 m/s at time t_1 = 11.6 s. For a time interval from t_1 = 11.6 s to t_2 = 19.7 s, the average acceleration of the dog has magnitude 0.30 m/s^2 and direction 35.0..
Four charges, q, -q, q, and -q, are located at equally spaced inter- vals on the x axis. Their x values are -3a, -a, a, and 3a, respec- tively. Does there exist a point on the y axis for which the electric field is zero? If so, find the y value.
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