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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
RH
Answered by Rachel H. • Physics tutor
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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 anti...
SP
Answered by Samuel P. • Physics tutor
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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. Wha...
KE
Answered by Kim E. • Physics tutor
8078 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, intermedicated by the ex...
RG
Answered by Roisin G. • Physics tutor
2747 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 th...
BQ
Answered by Ben Q. • Physics tutor
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