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What is the difference between a vector and a scalar quantity?

A vector describes both magnitude and direction, whereas a scalar only describes the magnitude. A common example is speed and velocity. Speed is a scalar, it describes only how fast something is going and ve...
PK
Answered by Patricia K. • Physics tutor
2517 Views

How do stars form?

stars begin as a giant cloud of gas which is also a protostar. gravity will pull the gas in on intelf which increases heat and pressure to such great quantities that nuclear fusion can begin. hydrogen is the...
DC
Answered by Dhiren C. • Physics tutor
2384 Views

How could I calculate the internal resistance of a cell?

Firstly, we must set-up an experiment and would need the following apparatus: The cell, a voltmeter, an ammeter and a variable resistor (a rheostat for this example). Setup the experiment so that the cell, t...
AJ
Answered by Aman J. • Physics tutor
10470 Views

Define the moment of a couple

The moment of a couple is the force times the perpendicular distance between the lines of action of the force.
HW
Answered by Heather W. • Physics tutor
5014 Views

An object with weight w is suspended from two strings at angles θ1 and θ2 to the vertical and with tensions T1 and T2. How would you resolve the vertical and horizontal forces?

Horizontal: T1 sin θ1 = T2 sin θ2Vertical: T1 cos θ1 + T2 cos θ2 = w
HW
Answered by Heather W. • Physics tutor
4306 Views