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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 start ...
JK
Answered by Justin K. • Physics tutor
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How do I do uncertainties properly?

All uncertainties show you is the range your answer will fall in. First off, when you do the experiment, any analogue scales will have an uncertainty of half their lowest unit and digital scales will be thei...
OP
Answered by Oliver P. • Physics tutor
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What are elastic and inelastic collisions? After a head on elastic collision of two balls of mass m1 and m2, deduce an equation relating the final and initial velocities of both balls.

Elastic collisions conserve both linear momentum and kinetic energy, whereas inelastic collisions conserve only linear momentum. The derivation will be shown on the virtual black board.
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Answered by Jason P. • Physics tutor
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Describe the key difference between a scalar and a vector quantity

A scalar quantity is one that only has magnitude while a vector has magnitude and an associated direction. For example, temperature is a scalar quantity because temperature only has magnitude/ size, there is...
OM
Answered by Olavo M. • Physics tutor
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Which unit is equivalent to J kg^-1? a) m s^-1 b) m s^-2 c) m^2 s^-1 d) m^2 s^-2

When working out unit equivalences the most straightforward approach is to use formulas (often in the data booklet) to help reach a correct answer. We start by looking at Joules; knowing a Joule is a unit of...
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Answered by Samuel K. • Physics tutor
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