A transverse pulse of frequency 9Hz travels 4.5m in 0.6s. Calculate the wavelength of the pulse
3.33m
0.30m
0.83m
1.20m
The melting point of a substance is equivalent to
Solidification temperature
Liquification temperature
Solidification pressures
Vapour pressure
A machine whose efficiency is 75% is used to lift a load of 1000N. Caalculate the effort put in to the machine if it has a velocity ratio of 4
80%
85%
87%
90%
A small amount of air is introduced into the vacuum above the mercury in a mercury barometer tube. The mercury level goes down because air molecules
Heat the mercury and made it to expand
Increase the pressure above the mercury
Cool the mercury and made it to contract
Decrease the pressure above the mercury
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