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four charges q=4nC form a square, 20 cm on a side. what is the potential of electric field at the center of the square?
A ball is thrown toward a cliff of height h with a speed of 29m/s and an angle of 60? ^\circ above horizontal. It lands on the edge of the cliff 3.5s later. How high is the cliff
A car of mass M = 1200 kg traveling at 45.0 km/hour enters a banked turn covered with ice. The road is banked at an angle theta, and there is no friction between the road and the car's tires.
A person weighs 689 N and the head is 53 N the average density of the person is 1010 kg/cubed meters how much force in N is required to keep a persons head out of the water.
Two people push a stalled car at its front doors, each applying a 250n force at 25 degree to the forward direction. How much work does each person do pushing the car 5.4 m?
A 2.6-kg object hangs at one end of a rope that is attached to a support on a railroad car. When the car accelerates to the right, the rope makes an angle of 5.0° with the vertical, as shown in the figure below. Find the acceleration of the car.
A door, essentially a uniform rectangle of height 2.00 m, width 0.83 m, and weight 109.0 N, find the horizontal components of the forces on the two hinges
The coherent green light of wavelength 650 nm illuminates two narrow slits in a screen. The slits are separated by 0.08 mm. A thin transparent plastic film (index of refraction 1.3) covers one slit. The light from the slits reaches a screen 1.0 m awa..
An ideal transformer has 50 turns in its primary and 400 turns in its secondary. 8.0- ac is connected to the primary. What is voltage available at the secondary
You land on a new planet with radius 5000km. You measure the freefall acceleration due to gravity to be 8.5m/s^2 at the surface
A 350 kg piano slides 3.90 m down a 23 degree incline slope, and is kept from accelerating by a man who is pushing back on it parallel to incline. What is the force completed by the man.
The sun moves in an orbit about the center of the Milky Way Galaxy at a speed of 290 km/s with a radius of 3 x 1020 km. How many stars are in the galaxy
An electron travels north at a speed of 6.0x10^4 m/s through a uniform magnetic field that is directed upwards and whose magnitude is 1.8x10^-3 T. determine the direction of the magnetic force
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