Atu-Okoye Emmanuel

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Atu-okoye provided a contribution 2 years ago

Question 1309 | Physics Past Questions

The answer is option E
Water is slightly warmer at the bottom of a waterfall than at the top because the gravitational potential energy is converted first to kinetic energy of the falling water, and finally to heat energy as it comes to rest at the bottom.

Atu-okoye provided a contribution 2 years ago

Question 1254 | Physics Past Questions

The correct answer is D not C.✅
Class cracks with temperature changes because it is a bad thermal conductor. This means that if one part of glass gets warm quickly, this heat will not move though the glass very quickly. When a most substances are heated they expand.

When thick glass placed in hot water, the surface warms first and expands. The deeper glass doesn't get warmed as quickly and doesn't expand as much. When one part of the glass expands more than another, it creates stress in the glass. When this stress exceeds the strength of the glass, it cracks.

Thin glass behaves the same way, but less stress develops because the glass stays closer to the same temperature.


Atu-okoye provided a contribution 2 years ago

Question 352 | Physics Past Questions

The angular dispersion of a prism depends on the angle of incidence and the angle of refraction..
The correct answer is option B not A.