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Describe the motion of a moving object with a given Displacement-Time graph. For each section on the graph, indicate the direction of motion and identify if the object is accelerating or not. What would the object's Velocity-Time graph look like?

Section 1: The object is moving away from its origin with a constant speed . There is no acceleration as demonstrated by the linear increase in displacement. Section 2: The object is stationary . Section 3: ...
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Answered by Tomek E. • Physics tutor
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Why is the sky blue?

Light from the sun is white. As it passes through the Earth's atmosphere, the different wavelengths of white light (i.e. the visible spectrum of colours) are scattered by gas and dust particles. Colours with...
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Answered by Josie R. • Physics tutor
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If Hannah slows down from a speed of 12 m/s to 8 m/s and has a mass of 45kg, how much force has been exerted on her to cause this deceleration?

Since force = mass x acceleration, acceleration = 4 as the change in velocity is 4 m/s and m = 45 as the mass of Hannah is 45 kg and hence the force required to be exerted on her is 4*45 which is 180N.
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Answered by Musa A. • Physics tutor
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Trolley A carrying mass 10kg is moving at speed 5m/s, and collides with stationary Trolley B carrying a mass 5kg. Indicating which Law you would apply, what is the speed and direction of Trolley B if Trolley A's resulting movement is 2m/s to the left?

By the Law of Conservation of Momentum, I nitial Momentum=Final Momentum, in a closed system. Take movement to the right as + and to the left as - Therefore equate the two as such: Initial (A+B) = final (A+B...
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Answered by Parinita S. • Physics tutor
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Describe the structure of an alpha particle

An alpha particle is made up of two neutrons and two protons. It is the same as the nucleus of a helium atom.
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Answered by Alexandra M. • Physics tutor
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