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Two cars are moving parallel to each other on a road. The first car is moving at a speed of 11 m/s, while the second car is moving at 17 m/s, what is the speed of the second car, relative to the first car.

The relative speed of the second car, with respect to the first car is 6 m/s. This is because they are both travelling in the same direction, but the second car is moving 6 m/s faster. That means, if we were...
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Answered by Adam G. • Physics tutor
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What are the 8 forms of energy? How can I remember them?

Most Kids Hate Learning GCSE Energy Names Magnetic Kinetic Heat Light Gravitational Chemical Sound Electrical Elastic Nuclear
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Answered by Matthew M. • Physics tutor
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An ideal gas at a temperature of 22 C is trapped in a metal cylinder of volume 0.2 m^3 at a pressure of 1.6x10^6 Pa. The gas has a molar mass of 4.3 x 10^(-2) kg mol^(-1). Calculate the density of the gas in the cylinder.

It's useful to start from the density formula and see what we need to find. The density is given by (rho) = m/V We know the volume V, so we only need to find the mass m. We are given the value for molar mass...
AS
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What is a standard candle?

A standard candle is an astronomical object that has a known absolute magnitude (intrinsic brightness). They are extremely important to astronomers since by measuring the apparent magnitude of the object the...
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Calculate the length of a 120m (as measured by the astronaut) spaceship travelling at 0.85c as measured by a stationary observer

The length of the spaceship of 120m was measured at rest relative to the spaceship so we will take that as the proper length, dennoted L proper We first calculate the Lorentz factor: Ɣ = 1/sqrt(1-(v/c) 2 ) Ɣ...
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Answered by Kerr M. • Physics tutor
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