Search our library of Physics A Level questions

Top answers

Physics

A Level

A truck with mass 1200kg is moving at 8m/s when it collides head-on with a stationary car of mass 800kg. As they collide, the vehicles move together with the same velocity, v. Calculate this velocity.

Momentum is conserved. MU + mu = (M+m)v (1200 x 8) + (800 x 0) = (1200 + 800)v 9600 = 2000v v = 9600/2000 = 4.8m/s

7000 Views

What is a stationary wave?

A stationary wave forms when there are two waves of equal frequency (or wavelength) travelling in opposite directions, passing through one another. Interference occurs, with constructive interference at a...

Answered by Samuel P. • Physics tutor

9440 Views

What would happen to n and Emax when a) the intensity is reduced to 1/2 I but the wavelength λ is unchanged? b) the wavelength λ is reduced but the intensity is unchanged?

FULL QUESTION: Electromagnetic radiation of wavelength λ and intensity I, incident on a metal surface, causes n electrons to be emitted per unit time. The maximum kinetic energy of the electrons is Emax. ...

Answered by Kim E. • Physics tutor

7318 Views

Explain what is meant by the mass defect of an atomic nucleui

Correct answer: the positive difference between the separated and combined mass of the nucleons.

Explaination: The nculeons are held together by a binding force- ie the strong force, intermedicate...

Answered by Roisin G. • Physics tutor

2232 Views

A spacecraft needs to be slowed down from a speed of 96m/s to 8.2m/s. This can be done by firing an object as the spacecraft is moving. If the mass of the spacecraft is 6730kg and the object is 50kg, calculate the velocity of the ejected object.

As we have there is object being fired out of the front of the spaceship we know the ship will have a lower velocity than before using the conversation of momentum. "The total momentum of a system is...

Answered by Ben Q. • Physics tutor

2171 Views