Top answers

Physics
A Level

A ball of mass 0.25 kg is travelling with a velocity of 1.2 m/s when it collides with an identical, stationary ball. After the collision, the two balls move together with the same velocity. How fast are they moving?

This question involves the principle of the conservation of momentum. 

Recall: Assuming no external forces act, linear momentum is always conserved. This means the total ...

Answered by Arnab H. Physics tutor
9127 Views

How can a car be changing velocity yet not changing speed?

Speed is a scalar, which means the car's speed will be a value that has a magnitude (number) only. Velocity is a vector, which means that the car's velocity w...

Answered by Jade L. Physics tutor
3678 Views

Describe one technique you could use to measure the threshold voltage for LEDs.

A sensitive ammeter is placed in series with LED. With the increase in Voltage, measure the potential difference value when it starts conducting. Black-out and shaded vision tube is used to observe the...

Answered by Milan P. Physics tutor
6396 Views

In still air an aircraft flies at 200 m/s . The aircraft is heading due north in still air when it flies into a steady wind of 50 m/s blowing from the west. Calculate the magnitude and direction of the resultant velocity?

Vector diagram showing an aircraft flying at 200 m/s north with a wind blowing at 50 m/s from west. Therefore the problem involves pythagoras theorem.

So, the Mag...

Answered by Milan P. Physics tutor
13582 Views

Describe how a stationary wave is formed and some of its properties.

Stationary waves are waves that do not transfer energy. These occur where both ends of the wave are in fixed positions. An example of this would be a string on a violin. As the wave reachs the end of t...

Answered by Matthew H. Physics tutor
15042 Views

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