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Point charges q=4.0X10^-9 C are placed at each of three corners of a square, the sides of which are L=15cm. Discover both the magnitude and the direction of the electric field at the vacant corner of the square (which is placed in vacuum). Use algebraic symbols in your derivation, and only put in numbers, with units, when you have obtained a final expression for the electric field. Be sure to treat important figures correctly.
The electrons in the beam of a television tube have a kineticenergy of 2.04 x 10-15 J. Initially, the electrons movehorizontally from west to east. The vertical component of theearth's magnetic field points down, toward the surface of theearth, an..
Three boxes, each of mass 20.0 kg are on a frictionless table, connected by massless strings. What is the net horizontal force on box A
Suppose the magnitude of the electric field in an electromagnetic wave is doubled, By what factor does the maximum intensity of the wave change
A bullet of mass m is fired with speed vo toward a steel block of mass M which is hanging from a massless rod of length D. After avery short impact, the bullet bounces backward with the speed vfwhile the block swings up to a height h.
A lamp (R = 145 ), an electric heater (R = 24 ), and a fan (R = 49 ) are connected in parallel across a 121 V line. What is the current in the lamp
You throw a 20-N rock vertically into the air from ground level. You observe that when it is a height 14.6 m above the ground, Use the work-energy theorem to find its speed just as it left the ground
A 38.8-kg boy, riding a 2.27-kg skateboard at a velocity of +5.22 m/s across a level sidewalk, jumps forward to leap over a wall. What is the skateboard's velocity relative to the sidewalk
A 52.0 kg ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.0 turns each second. The distance from one hand to the other is 1.50 m. Biometric measurements indicate that each hand characterist..
A cannon is aimed at an angle of 30 degrees above the horizontal. It fires a cannonball into the direction of a valley with a muzzle velocity of 100m/s. What is the maximum height of the ball
hearing the siren of an approaching fire truck, you pull over to the side of the road and stop. As the truck approaches, you hear a tone of 460 Hz; Find speed of the truck
A 2.4 mm-diameter copper wire carries a 30 A current (uniform across its cross section). Determine the magnetic field at the surface of the wire
Find the focal length of a glass lens that has an index of refraction equal to 1.66, a concave surface that has a radius of curvature of magnitude 108 cm
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