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Why does Lenz's law have a minus sign?

The minus sign shows that the direction of induced current always opposes the change that created it. So when certain metals are cropped through say a copper tube they slow down. Show video of Lenz's law in ...
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Answered by Joseph J. • Physics tutor
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What is the difference between the cubism and fauvism movement in art?

Despite sharing a time period and many aspects of style, the two movements have many prominent differences. The subjects share a common subject matter: both are still life , featuring fruits and other common...
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Answered by Isabelle B. • Art tutor
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How do you write a worthwhile plan under exam pressure?

Possibly the most crucial element to writing a good history essay is a plan. However, this is not always easy under exam conditions and the temptation to dive straight into writing your answer is always ther...
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Answered by Georgia H. • History tutor
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The velocity, v, of a moving body at time t is given by v = 50 - 10t. A) Find its acceleration. B) The initial displacement, s, is 40 meters. Find an expression for s in terms of t.

A) To find acceleration from a velocity equation, we must differentiate velocity, v = 50 - 10t.This gives us dv/dt = -10 = accelerationB) To find displacement from velocity, we must integrate the velocity eq...
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Answered by Alex S. • Maths tutor
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Evaluate the claims about experience in arguments for the existence of God, or the gods.

Introduction should explain the terms in the question, state your thesis and dissect the question into arguments supported by philosophers, such as Richard Swinburne, Richard Dawkins, A.J. Ayer and William A...
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Answered by Alex S. • Philosophy tutor
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