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When is the subjunctive used in Spanish?

In Spanish, the subjunctive mood is used to communicate meanings which are subjective or less certain than the indicative mood. The indicative mood is used to express certainty and objectivity; whereas the s...
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Answered by Rachelle O. • Spanish tutor
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How does an action potential cause contraction in skeletal muscle?

The point at which a motor neurone synapses with a muscle fibre is called the neuromuscular junction. The unmyelinated nerve fibre stops around 30 nanometers before the muscle fibre, leaving a gap called the...
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Answered by Orla M. • Biology tutor
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how to integrate by parts

If you aren't lucky enough to be told in the question, the first thing we have to do is know when we should you integration by parts. Well, like most things in maths this should become second nature to you w...
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Answered by Tim M. • Maths tutor
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What does the double slit experiment tell us about light?

Imagine an opaque barrier (no light can get through) with two parallel slits in it, onto which we shine a coherent light source (light of only one wavelength and in phase - a laser, for example, can produce ...
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Answered by Adam O. • Physics tutor
9257 Views

Show that the orbital period of a satellite is given by T^2=(4pi^2r^3)/(GM) where r is the orbital radius, G is the gravitational constant and M is the mass of the Earth. Then find the orbital radius of a geostationary satellite.

The first part of this question relies on remembering one key principle which is that for a satellite, or any body orbiting in a circle, centripetal force is provided by gravitational force. The rest is simp...
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Answered by Michael H. • Physics tutor
40673 Views