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When a hailstone of 0 C falls towards the earth, the kinetic energy of the hailstone is transferred to thermal energy in the ice. What is the minimum speed so that it just melts when it hits the surface. The latent heat of fusion of ice is 340 kJ/kg.

When approaching a Physics problem in IB, it is especially important to reread the question a couple of times and note down any information that you might think is relevant to solving the question and sta...

Answered by Justin K. Physics tutor
13210 Views

A lorry is travelling around a roundabout at constant speed. Why is its velocity changing?

Because velocity is a vector and therefore has both magnitude and direction. Thus as the lorry is changing direction whilst travelling around the roundabout its velocity is also changing (velocity = displ...

Answered by Adam L. Physics tutor
4095 Views

Is F=ma Newton's 2nd Laws of Motion?

That is a good question. F=ma is a special case of Newton's 2nd Law of Motion . Newton's second law states that: The rate of change of linear momentum is proportional to the applied force and acts in the ...

Answered by Mohsin Z. Physics tutor
11210 Views

What does "superimposition" mean?

Superimposition is when two transverse waves come together, and their frequencies cancel each other out. If the waves are completely superimposed, the resultant wave is 0.

Answered by Sameer M. Physics tutor
8811 Views

Why is potential energy negative? What does that even mean?

This is really just a definition! When we ask what the potential energy of an object is, we are really asking what energy is available to be extracted. In the case of gravity: two objects separated by an ...

Answered by Ben T. Physics tutor
17566 Views

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