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A flat, circular, analog clock face has negative points charges -q, -2q, -3q, -4q,....., -12q fixed at the position of corresponding numbers. the clock hands do not perturb the net field due to the point charges. At what time does the hour hand point in the same direction as the electric field vector at the center of the dial? (hint: use symmetry)
When a particular inductor is connected to a sinusoidal voltage with a 245 V amplitude, a peak current of 7.9 A appears in the inductor. What is the maximum current if the fre- quency of the applied voltage is doubled? Answer in units of A. b.)What i..
a?1000 kg aircraft going?25 ms collides with a?1500 kg aircraft that is parked. they stick together after the collision
suppose that a block sliding with positive velocity v on a horizontal surface experiences a drag force fv-f0ekv where
A solar cell has a light-gathering area of 10 cm^2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1000 W/m^2 sunlight. What is the efficiency of the solar cell
An image projected on a screen is 9.1 cm high and is 6.4 cm from the lens. If the object that produces the image is 1.2 cm tall on the screen
A 4.0- kg wooden block rests on a level table. The coefficient of friction between the block, What is the acceleration of the wooden block
a tunnel leading straight through a hill makes tones at 135 hz and 165 hz especially loud due to standing waves.
A car drives straight off the edge of a cliff that is 47.00m high. The police at the scene of the accident observed that the point of impact is 122 m from the base of the cliff. How fast was the car travelling when it went over the cliff.
submarine on the ocean surface receives a sonar echo indicating an underwater object. What is the object's depth
A 9-g bullet is fired from a rifle. It takes 3.30 10-3 s for the bullet to travel the length of the barrel, find the average net force exerted on the bullet
A ball of mass 0.196 kg with a velocity of 1.41 m/s meets a ball of mass 0.302 kg with a velocity of -0.393 m/s in a head-on, elastic collision. (a) Find their velocities after the collision. 1f = m/s 2f = m/s (b) Find the velocity of their center of..
q1. the position of a pinewood derby car was observed at various times the results are summarized in the following
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