Physics

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Physics

You will be given 4 physics questions to solve in 6 minutes and 40 seconds or 1 minute and 40 seconds (100 seconds) per question.

1 / 4

At the melting point, which of the following are correct about paraffin wax?
1. The substance becomes more disordered.
2. The wax takes in heat but its temperature stays the same.
3. Bonds between the carbon and hydrogen atoms are broken.

2 / 4

The law of gravitation states that the gravitational force between two bodies of mass m1 and m2 is given by:

What is the gravitational force between the Earth and the Moon?

3 / 4

When cooled below 4.2 K, mercury becomes a superconductor, which means it has no electrical resistance. When a current is passed through mercury under these conditions, which of the following effects will be present?
1. Thermal
2. Chemical
3. Magnetic

4 / 4

A uniform bar of length 2.0 m and weight 1000 N has its centre of gravity at its centre. The bar is pivoted in the position shown, and supports a weight of 200 N in the position shown in the diagram.

What weight is needed at position P to balance the bar?

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