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What is the equation linking Power, Time, and energy? and Calculate the work done by a cyclist when his power output is 200 W for 1800 seconds?.

The equation linking Power, Time, and Energy is:P=W/tAnd here P= 200 W, and t= 1800 sHence, W= 200*1800 = 360,000 JNB: Remember here, the SI units are important.
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Answered by Othman A. • Physics tutor
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Why do rays of light change direction as they pass from air to a glass block?

Light travels as waves which have a distinct set of properties: a speed, a frequency and a wavelength. These properties are related to each other through the following equation: speed = frequency * wavelengt...
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Answered by Lisa C. • Physics tutor
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Explain how red-shift provides evidence for the Big Bang theory.

Red-shift describes the phenomenon whereby the wavelength of light from a source increases as it travels through spacetime, hence observed as being 'shifted' to the red end of the spectrum (as red light has ...
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Answered by Abbie R. • Physics tutor
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Describe thermal conduction

Thermal conduction is one of three types of heat transfer. It occurs when 2 objects are in contact and have a difference in temperature. The kinetic energy is passed on from the warmer object to the cooler o...
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Answered by Lakshan T. • Physics tutor
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a) Give an example of an alpha radiation source used in homes b) Why is it safe to use a source of alpha radiation in the house

a) Smoke detector- americiumb) As alpha radiation is not very penetrating
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