A point of charge q is placed at the point (-d,0) and a second point charge of charge 2q is placed at point (2d,0). a) What is the force on the third charge of charge -q placed at point (0,d) if d=190nm and q=250nC? b) find the two positive charges placed on the x-axis? c) What is the electric field at the origin?

Two objects with masses m1 = 37 kg and m2 = 39 kg are moving toward each other with speeds V1 = 14 m/s and V2 = 18 m/s. They collide and stick together. Find their final: speed:

Kinetic energy is conserved in an elastic collision by definition. Show, using the Galilean transformation equations, that if a collision is elastic in one inertial frame it should be elastic in all inertial frames

Arrange four quarter coins touching each other as a 2-D square lattice. Calculate the area of the air-space (dead-space). (Ignore the thickness of the quarters.) Repeat the problem for a triangular lattice.

A parallel-plate capacitor has 2.18 cm2 plates that are separated by 5.69 mm with air between them. If a 18.0 V battery is connected to this capacitor, how much energy does it store?

A wooden ring whose mean diameter is 14.5 cm is wound with a closely spaced toroidal winding of 615 turns.

Compute the magnitude of the magnetic field at the center of the cross section of the windings when the current in the windings is 0.640 A .

Billiard ball A of mass mA = 0.122 kg moving with speed vA = 2.80 m/s strikes ball B, initially at rest, of mass mB = 0.145 kg . As a result of the collision, ball A is deflected off at an angle of θ′A = 30.0∘ with a speed v′A = 2.10 m/s, and ball B moves with a speed v′B at an angle of θ′B to original direction of motion of ball A.

1) Solve these equations for the angle, θ′B, of ball B after the collision. Do not assume the collision is elastic.

2)Solve these equations for the speed, v′B, of ball B after the collision. Do not assume the collision is elastic.

A batter hits a pitched ball when the center of the ball is 1.28 m above the ground.The ball leaves the bat at an angle of 45° with the ground. With that launch, the ball should have a horizontal range (returning to the launch level) of 107 m. (a) Does the ball clear a 8.22-m-high fence that is 97.0 m horizontally from the launch point? (b) At the fence, what is the distance between the fence top and the ball center?

Could a star ever move in retrograde motion? Would you ever expect a star to significantly change its position in the sky relative to other stars and constellations? Why does a planet that we can observe with the naked eye do these things while stars do not?

Consider two oppositely charged, isolated parallel plates separated by distance D, with capacitance C, charge Q, and stored energy U. D is small compared to the dimensions of the plates. For each statement below, select "True" or "False".

1. Because of energy conservation, inserting a dielectric leaves U unchanged.
2. When D is halved, Q stays the same.
3. Inserting a dielectric decreases C.
4. When D is doubled, U increases.
5. When D is doubled, C is doubled.
6. Inserting a dielectric increases Q.
7. Increasing D, leaves the E field unchanged.

A conducting sphere is placed within a conducting spherical shell as shown in the figure below. The conductors are in electrostatic equilibrium. The inner sphere has a radius of 1.50 cm, the inner radius of the spherical shell is 2.25 cm, and the outer radius of the shell is 2.75 cm. The inner sphere has a charge of 225 nC, and the spherical shell has zero net charge.

When consulting manuals, electricians, online sources, etc., they always instruct you to handle halogen light bulbs with gloves.

The "explanation" that usually accompanies this statement is that oils and salts from a bare hand can "react" with the surrounding glass/quartz, owing to the fact that halogen bulbs are much hotter than ordinary ones. These reactions would cause weak spots in the quartz (or in some versions of the story, the filament), decreasing the lifetime of the bulb.

Is there any merit to this explanation? What are then the precise mechanisms involved in the bulb's degradation when the bulb is touched by a dirty monkey finger?

What maximum output would you expect from a wind turbine with a blade of radius 15 ft in a 25 mph wind

A liquid has a density at 289K of 955kg/m^3. Its(volume) thermal expansion coefficient is 1.05E-3/K. What is its density at 316K? Answer 929 kg/m^3 I'd appreciate explanation ! Thank you :)

1. Although quantum information has been around for a long time, we are starting to see more about it in the media