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Why is the redshift important?

The redshift is an important piece of evidence for the big bang theory. If we look at the visible region on the electromagnetic wave spectrum, we will see there is red light on the left and there is violet o...
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Answered by Laxshana C. • Physics tutor
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Using Newton's law of gravitation, derive a suitable formula for the escape velocity of an object at Earth's surface.

Newton's law of gravitation is; F = GMm/(r 2 ) Where G is the Universal Gravitational constant, M is the mass of Earth, m is the mass of the object and r is the radius of Earth (no values are needed for this...
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Answered by Charlie M. • Physics tutor
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Why is the nuclear model better than the plum pudding model of the atom?

The plum pudding model was the idea of a positively charged sphere, with negative electrons dotted within it as the model of an atom. easiest understood drawn out A scientist named Rutherford did an experime...
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Answered by Georgina H. • Physics tutor
21373 Views

Why would you get an electric shock if you touched a wire?

Live wires are dangerous because they carry current to the appliance they're connected to, at very high voltages. This means the wire has a high potential voltage, whereas a human has zero potential voltage ...
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Answered by Georgina H. • Physics tutor
12927 Views

A small ball of mass 150 g is placed at a height of 20cm above the ground on an incline of 35°. It is released and allowed to roll down the slope; what will be the ball's speed when it reaches the ground? Assume friction and air resistance can be ignored.

This question is best solved using conservation of energy, since it is stated that friction and drag (non-conservative forces) can be ignored.When the ball is released at the top of the slope, its initial sp...
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Answered by Rhys S. • Physics tutor
2219 Views