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Physics
A Level

The braking distance of a road train travelling at 15m/s is 70m. Assuming that the same braking force is applied at all speeds, show that the braking distance of a road train when travelling at 25m/s is about 190m.

Energy = force x distance and Energy = 0.5 x mass x velocity squared

Hence, force = (0.5 x mass x velocity squared) / distance --- (equation 1) This applies for both situation A and B, and given th...

JJ
Answered by Jack J. Physics tutor
10119 Views

What is a moment?

A moment about a point is the product of a force applied and the distance perpendicular to the line of action of that force. So M = F*d

KT
Answered by Kieran T. Physics tutor
2632 Views

A ball is initially at rest and is dropped from a height of 10m. Calculate the velocity of the ball when it reaches the ground

For this we need to use a SUVAT equation. S=displacement U=initial velocity V=final velocity A=acceleration T=time In the question we are give U=0m/s since the ball is at rest to start with Since the ball...

CG
Answered by Catherine G. Physics tutor
10797 Views

Experimentally, how would you calculate the Young's modulus of a material?

Young's modulus = stress/strain. Stress = F/A Strain= e/l. Measure the length of a wire between 2 points, placing a marker at each. Also measure the diameter to calculate the cross sectional area of the w...

BL
Answered by Ben L. Physics tutor
2188 Views

Show that gravitational force within a nuclei is negilible compared with the electric repulsion.

Electric Field Repulsion - 90N Gravitation Field Attraction - 7.3x10^-35N

MS
Answered by Matthew S. Physics tutor
2448 Views

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