Mechanics | Relativity Answers

if 2 moles of ideal moatomic gas at temp To is mixed with 4 moles of another ideal moatomic gas at temp 2To,then the temp of mixture is

A solid iron rectangular block of dimensions 127x52x15 mm and a density of 7860 kg/ m3 is suspended in
brine solution. When the iron block is completely immersed in the solution.Determine
i) the upthrust on the Iron block
ii) tension in the supporting cable

http://prntscr.com/hx78ju < GCSE question, wanted to check if I was right before submitting.

A 10kg iron bar(specific heat 011cal/gC°)at 80°C is placed on a block of ice.How much ice melts?

If Phosphorous is doped with silicon and silicon is doped with Boron, identified the type of
semi conductions.

A wire under tension vibrates with a frequency of 550Hz; what would be the
fundamental frequency if the wire were half as long, twice as thick and under
vibration in pipes.

A man carrying a bucket of water walking on a level road with uniform velocity does no work ? true or false ?

A string under tension 1080N, of mass per unit length 0.003kg/m has many resonant frequency on such frequency is 450 Hz and the next higher frequency is 600Hz How long is the string?

In a horizontal pipeline pressure falls by 10Pa b/w 2 points separated by a distance of 1km. The change in kineticenergy/kg of oil flows from one point to the other is (density-oil=800kg/m3) ?

An experiment rocket designed to land upright falls freely from a height of 2 x 10^2m, starting at rest. At a height of 80 m, the rocket's engines start. And provide constant upward acceleration until the rocket lands. What acceleration is required if the speed on touchdown is to be zero?