Mechanics | Relativity Answers

A 0.50 kg ball traveling at 6.0 m/s collides head-on with a 1.00-kg ball moving in the
opposite direction at a velocity of –12.0 m/s.
The 0.50 kg ball moves away at –14 m/s after
the collision. Find the velocity of the second ball.

A snowmobile has a mass of 2.50 × 102 kg. A constant force is exerted on it for 60.0 s. The
snowmobile’s initial velocity is 6.00 m/s and its final velocity 28.0 m/s.
What is its change in momentum?
What is the magnitude of the force exerted on it?

a. Calculate the velocity that a satellite shot from Newton’s cannon must have to orbit
Earth, 150 km above its surface.
b. How long would it take for the satellite to return to the cannon in seconds and minutes?

A straight wire 0.10 m long carrying a current of 2.0 A is at right angles to a magnetic field.
The force on the wire is 0.04 N. What is the strength of the magnetic field?

A stream of doubly-ionized particles (missing two electrons and thus carrying a net charge
of two elementary charges) moves at a velocity of 3.0 × 104 m/s perpendicular to a
magnetic field of 9.0 × 10–2 T. What is the magnitude of the force acting on each ion?

A permanent horseshoe magnet is mounted so that the magnetic field lines are vertical. If a
student passes a straight wire between the poles and pulls it toward herself, the current
flow through the wire is from right to left. Which is the north pole of the magnet?

A straight wire, 30.0 m long, moves at 2.0 m/s perpendicularly through a 1.0 T magnetic
field.
a. What EMF is induced in the wire?
b. The total resistance of the circuit of which the wire is a part is 15.0 Ω. What is the
current?

How can trains travel in such a frictionless metal tracks?

How bow and arrow works on the basis of parallelogram law?

What do we mean by inverse square law?