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A pipe has one open and one closed end. Determine the ratio of the frequency of the first harmomic to that of the next harmonic.

The first harmonic has wavelength λ 1 = 4L and the next harmonic has wavelength λ 2 = 4L/3 . Hence :f 1 /f 2 = (4L/3)/4L = 1/3
PM
Answered by Pablo M. • Physics tutor
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A student of mass m=50kg runs an experiment. He throws a ball of mass m = 400g from a height h = 20m. What will be the speed of the ball he records just before it touches the ground?

First, we need to see what the important information in this problem is: the mass of the student is irrelevant as the problem focusses on the ball. So we now know that the important information is: m = 400g ...
MM
Answered by Martina M. • Physics tutor
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What are Newton's 3 laws of motion?

First law: Unless acted upon by a force, a object either remains at rest or moves at a constant speed.Second Law: Force=Mass*AccelerationThird Law: For every action there is an equal and opposite reaction
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Answered by Tomas A. • Physics tutor
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What is the maximum speed of an electron emitted from a metal surface with a threshold frequency of 5.706*10^(14) by light with a wavelength of 350nm?

In order to determine the maximum speed of an emitted electron, we must first find it's kinetic energy from the energy of an incident photon and the work function of the metal surface (the minimum energy req...
MG
Answered by Mattea G. • Physics tutor
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If a car has a mass of 670kg and has a driving force of 1200N and a force from resistance of 300N, what is the acceleration of the car? What is the speed of the car after 5 seconds?

The force of resistance should be taken away from the driving force to result in a total force of 900N driving forwards.Then use F=ma, rearranged so that a = F/m, to result in an acceleration of 1.34 m/s^2. ...
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Answered by Cameron A. • Physics tutor
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