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State Newton's 1st Law:

An object will remain at rest or constant velocity if all the forces acting upon it are equal (net force=0N).
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Answered by Sam H. • Physics tutor
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If photons of wavelength 0.1nm are incident on a 2m x 2m Solar Panel at a rate of 2.51x10^15s^-1, calculate the intensity, I, of the photons on the Solar Panel.

If wavelength = 0.1nm, we know (as E=hc/λ ), the energy provided by each photon, E= 1.99x10 15 J .Therefore, if they hit the panel at a rate of 2.51x10 15 s -1 , we know Power = Energy x Rate, =4.99WIntensit...
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Answered by Sam H. • Physics tutor
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What is the density of a material if 4 cubic metres (m3 ) of it has a mass of 2,200 kg?

Density can be described as the amount of mass per unit volume. It describes how closely together different particles are spaced. It varies significantly from solids to liquids to gases.In terms of calculati...
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Answered by Jamie M. • Physics tutor
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Why is a pendulum with a bob of the same size but larger mass than another bob damped more lightly?

The heavier bob has more kinetic energy/potential energy/momentum for any given amplitude of the two pendulums due to its larger mass, as each of these three quantities depend linearly on mass. The damping i...
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Answered by Lucy S. • Physics tutor
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An electron is trapped within a square well potential of width 10 nm. What would be the wavelength of the photon emitted when an electron moves from the first energy level to the ground level.

Use energy difference between ground and first level to find E1-E0. Energy of the electron a nth energy level is found using En = (n^2 pi^2 hbar^2)/2mL^2Where n is the energy level plus 1, pi and hbar are co...
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Answered by Aubin G. • Physics tutor
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