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Describe what red shift is and why i provides evidence for the Big Bang Theory.

Red-shift is the increase in wavelength emitted from distant objects moving away from the observer, making them appear more red.The Big Bang Theory states that the universe began from a singularity which the...
RD
Answered by Robert D. • Physics tutor
2970 Views

A person swims from a depth of 0.50 m to a depth of 1.70 m below the surface of the sea. density of the sea water = 1030 kg/m^3 gravitational field strength = 9.8 N/kg Calculate the increase in pressure on the swimmer. Give the Unit.

ΔP = Δh ρ g Δh = 1.7 - 0.5 = 1.2 m ρ = 1030 kg/m 3 g = 9.8 N/kg ΔP = 1.2 (m) x 1030 (kg/m 3 ) x 9.8 (N/kg) = 12,112.8 N/m 2 = 12,112.8 Pa
EP
Answered by Elliot P. • Physics tutor
8304 Views

When the current through an ohmic conductor is 2A, the potential difference across it is 6V. What is the potential difference across the same ohmic conductor when the current is increased to 3A?

To answer this, you need to pick up on the clues in the question. "Ohmic conductor" is explicitly mentioned twice, so this is likely to be important. You should know that for ohmic conductors, p.d....
EG
3950 Views

Which of the following are magnetic materials? Copper, Cobalt, Carbon, Nickel

Cobalt and Nickel
EM
Answered by Elizabeth M. • Physics tutor
2400 Views

Explain the Lorenz force

The force exerted on a charged particle q moving with a velocity v through an electric and magnetic field, E and B respectively. F=qE+qvxB. We usually care mostly about the magnetic part. It is also worth no...
AM
Answered by A M S. • Physics tutor
2152 Views