Mechanics | Relativity Answers

An electric charge of 2.10^-3 C at a point X in an electric field had electric potential energy of 4.10^-2J. It was moved to another point Y where it’s potential energy was 6.10^-2 J. What is the potential difference between X and Y and the electric field strength if the points X and Y and seperated by distance 0.25m?

Explain the elastic collision.

• Two point charges, one +400.0 nC and the other -400.0 nC, located 20.00cm to the right of the first , are in vacuum. Determine the electric field (magnitude and direction) at a point midway between the charges.

A stone of weight 32g falls from the top of a 250m high cliff.i.Calculate the work done by the force of gravity in pulling the stone to the foot of the cliff. 

How are the classical laws of conservation of energy and conservation of mass modified by modern relativity?

The fishing pole shown makes an angle of 20.0° with the horizontal. What is the torque exerted by the fish about an axis perpendicular to the page and passing through the angler’s hand if the fish pulls on the fishing line with a force F = 100 N at an angle 37.0° below the horizontal? The force is applied at a point 2.00 m from the angler’s hands. 

One of the most famous consequences of the relativity of time is the twin paradox.

Explain how the twin paradox comes about, and also explain why it does not break the

symmetry of special relativity

The equation of motion of a cyclist has the form: x = 40 - 8t. Determine the direction and speed at which the cyclist is moving: *

Explaination range in projectile motion.