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A car horn has a frequency of 680 Hz and a wavelength of 50cm. Calculate the speed of the sound waves produced by the car horn:

velocity (v) = frequency of the wave (f) x wavelength of wave (in metres) (λ) 50cm in metres: 50/100 = 0.5m Therefore (v) = 680 x 0.5= 340 (m/s)
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Answered by Gunchit S. • Physics tutor
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A mobile phone falls to the floor. The glass screen shatters while the aluminium frame remains intact. Explain why this happens in terms of the properties of glass and aluminium.

The glass screen is a brittle material so breaks with little plastic deformation.The aluminium material however shows elastic behavior and will, when the force is removed return to the original shape. This i...
LC
Answered by Lewis C. • Physics tutor
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Hanging on a branch of a tree, a monkey sees a hunter aiming a gun at him. The monkey lets go of the branch at the exact same time the bullet is fired. Explain why the bullet hits the monkey.

This question is also applicable to physics mechanics. Many would think the bullet will hit the monkey because it is travelling much faster than him. However, modelling the monkey as a particle and ignoring ...
AH
Answered by Akram H. • Physics tutor
6292 Views

If a boy is stationary on a skateboard and jumps off forwards, why does the skateboard move backwards?

Momentum before the collision or separation must equal the momentum afterwards, this is called the conservation of momentum. The situation before had the skateboarder on the skateboard, both stationary. As m...
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Answered by Amy R. • Physics tutor
20232 Views

A charged particle in a cyclotron moves in a circle with radius 5mm. If the field in the cyclotron is 0.06 T and the velocity of the particle is 2.4x10^7, what is the charge-mass ratio of the particle?

Firstly, we should equate the centripetal force to the force on a moving charge using equations from our formula booklet: (force on a moving charge): F = Bqv(centripetal force): F = mv 2 /rmv 2 /r = Bqvwhen ...
PV
Answered by Preshayla V. • Physics tutor
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