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What is the difference between a vector and a scalar?

A vector is a measurement of something that has more than 1 number associated with it, for example velocity. I can tell you how fast a car is going using the magnitude of velocity, speed, and I can tell you ...
MZ
Answered by Max Z. • Physics tutor
4481 Views

What is the difference between EMF and Voltage?

EMF stands for the Electromotive Force and it can be defined in a few ways: 1. It's the potential across the terminal ends of a cell. 2. Or in other words, the amount of energy that is given to a charge in i...
FG
Answered by Francisco G. • Physics tutor
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What is the second law of thermodynamics?

Formally speaking, the definition required in an exam would be that the second law of thermodynamics states that the entropy of an isolated system never decreases. The second law was conceived with the conce...
LB
Answered by Lucas B. • Physics tutor
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How can I draw the light diagram in a convergent lens?

There are three rays whose direction is known: The ray passing through the intersection of the lens and the optical plane does not change its direction. The ray passing through the object focal point go para...
PA
Answered by Pablo A. • Physics tutor
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Sue's brother is on a sled on top of ice (assume no friction). Sue is pulling her brother with 15 N of force at a 38 degree angle above the horizontal. Calculate the work done if she pulls him for 50 meters.

Using the equation W = F * d we know work is equal to the force in the same direction as the distance moved. To find the force in the same direction as the distance we must find the horizontal component. To ...
EB
Answered by Emily B. • Physics tutor
2108 Views