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What is meant by the doppler effect?

The doppler effect is the change in frequency and wavelength of waves coming from a wave source moving relative to you. If a wavesource is stationary then the waves in all directions all have the same freque...
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Answered by Thomas D. • Physics tutor
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How do I derive equations for Time of Flight and Range in Parabolic Motion?

A ball is thrown with a certain launch angle (theta) above the horizontal with a certain velocity v . Let us assume that the gravitational acceleration g is constant over the flight, the ball has no spin and...
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Answered by Riccardo B. • Physics tutor
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What is the threshold frequency of a photon to excite and then emit photoelectrons from a material?

Use the photoelectric effect equation which shows conservation of energy between photons, electrons and the material that the electron is being freed from, hf = phi + KE max . Defining terms: h is Planck's c...
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Answered by Charles S. • Physics tutor
7844 Views

How does the angle of an inclined plane relate to its efficiency, given the coefficient of friction between a body and the plane?

Let’s define the efficiency first. The efficiency is basically the ratio between what we want over what we pay for. So, we want to lift an object up to a height, say H. In the ideal scenario we lift that obj...
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Answered by Alexandru S. • Physics tutor
19133 Views

2 resistors of resistances 150 ohms and 5000 ohms respectively are in series with each other. They both are also in parallel with a 1000 ohm resistor. What is the total resistance?

Firstly, you should start by working out the total resistance for the 150 ohm and 5000 ohm resistors which are in series : -In series the total resistance is given as the sum of the resistance of each indivi...
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Answered by Gaggan J. • Physics tutor
2639 Views