Physics Answers

Sphere A, with a charge of +6.0 𝜇𝐶, is located near another charged sphere, B. Sphere B has a charge of −3.0 𝜇𝐶and is located 4.0 cm to the right of A.

What is the force of sphere B on sphere A?

A third sphere, C with a +1.5 𝜇𝐶charge, is added to the configuration. If it is located 3.0 cm directly beneath A, what is the new net force on sphere A?

Find the potential at a distance of 0.07 m from a -6 nC charge

. A driver notices an upcoming speed limit change from 45 mi/h (20 m/s) to 25 mi/h (11 m/s). If she estimates the speed limit will change in 50 m, what acceleration is needed to reach the new speed limit before it begins?

From ear level down the wishing well, a coin is dropped by Liza. The coin falls a distance of 7.00 m before it strikes the water. If the speed of sound is 343 m/s, how long after Liza releases the coin will she hear a splash?

A bird can fly 25 km/h. How long does it take to fly 3.5 km?

Spheres A, B, and C have charges +8.0 𝐶, +12.0 𝐶, and −5.0 𝐶, respectively. The three spheres are allowed to touch each other simultaneously and then separated. (a) What is the total charge on the three spheres before and after touching each other? (b) What is the final charge on each sphere assuming they are identical? (c) What is the final charge on each sphere assuming that 𝑟_𝐴=𝑟_𝐵=2𝑟_𝐶?

A hovercraft passes point A moving West with a speed of 15 m s−1.

The hovercraft immediately begins to accelerate at a steady rate of 0.13 m s−2 North.

What is the magnitude of the velocity of the hovercraft 200 s after it passes point A? (in m s−1)

Give your answer to 2 s.f.

(note: a hovercraft rides on a cushion of air and so does not contact the ground and experiences no frictional forces)

How can you distinguish a raw egg from a hard-boiled one by spinning each one on a table?

A hollow cylinder and a solid cylinder have the same mass and the same diameter. They are released at the same time from rest from the top of an incline. Which will reach the bottom first?

projectile is fired with an initial velocity of 193.2 feet per second upward at angle of 300to the horizontal from point 257.6 feet above a level plain. What horizontal distance will it cover before it strikes the level plain? A dart is thrown horizontally with an initial speed of 10 m/s toward point P, the bull's-eye on a dart board. It hits at point Q on the rim, vertically below P, 0.2 s later. What is the distance PQ? How far away from the dart board is the dart released? 3 Find the angle of elevation of a gun which fires a shell with muzzle velocity 366 m/s at a target on the same level but 4,575 m distant.