Top answers

How does conduction work in metals?

A metal has free electrons, so when it is heated these electrons gain kinetic energy, meaning they move faster. As a result, these free electrons will collide with other electrons or ions, transferring energ...
JC
Answered by Josh C. • Physics tutor
7685 Views

If a car is travelling over a curved hill, what is the maximum speed it can travel before losing contact with the road surface?

This is a question about circular motion that also includes some knowledge of Newton's laws. The car is travelling over a curved surface, which you can imagine as part of the circumference of a circle. In or...
EH
Answered by Emma H. • Physics tutor
58713 Views

What is the maximum height a pole vaulter could reach?

Whilst at first this question looks difficult, once broken down it becomes quite easy. It is a simple case of energy exchange. The pole vaulter gives themselve kinetic energy as they aproach the bar, and tur...
TB
Answered by Tim B. • Physics tutor
17305 Views

A rocket travels at 500m/s two minutes after its take-off. If it was initially stationary, calculate its acceleration. If the rocket has a mass of 1800kg, what force is required to give it an acceleration of 2m/s^2?

a) Acceleration is the rate of change of velocity of an object In this case, the equation that we will use to calculate it is a = (v - u )/ t where v is the rocket's final speed, u is its initial speed, and ...
DS
Answered by Dhrushee S. • Physics tutor
5518 Views

Why do lasers produce an intense coherent beam of light?

Lasers produce an intense coherent beam of light because the waves have the same frequency, are in phase with each other and have a low divergence.
LB
Answered by Lily B. • Physics tutor
5824 Views