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Physics
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What is the difference between a scalar and a vector? Give 3 examples of each.

A scalar is a quantity that has only magnitude (size)
E.G Distance, Speed, Temperature
A vector is a quantity that has magnitude and a direction.
E.G Displacement, Velocity, Change in Tempe...

Answered by Marcin K. Physics tutor
2908 Views

An electron falling from one energy level to another emits a photon of wavelength 550nm. What is the difference between the two energy levels?

The key equation is that of the energy of a photon.

E = hc/λ​ 

Using λ​ = 550nm gives E = 3.61x10^-19...

Answered by Jamie L. Physics tutor
2412 Views

A space probe of mass 1000kg, moving at 200m/s, explosively ejects a capsule of mass 300kg. The speed of the probe after the explosion is 250m/s. What is the velocity of the capsule?

To solve this problem, we must apply conservation of momentum. Even though there is kinetic energy being added to the probe-capsule system by the explosion, momentum will always be conserved if there a...

Answered by Alexander S. Physics tutor
6643 Views

How does energy flow from voltage source to resistor in a simple DC circuit?

Let us consider a simple dc circuit consisting of a battery and a resistor connected by ideal wires. As we know, current starts to flow thorugh the resistor and heat is generated as a result of this cu...

Answered by Sree Harsha N. Physics tutor
2549 Views

Do batteries contain current, which comes out when they are in a circuit?

No; this is a common misconception! Batteries store energy, which is used to push electrons (charges) around a circuit. The flow of electrons is called current. As the electrons flow through the circui...

Answered by Samuel S. Physics tutor
2623 Views

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