Molecular Physics | Thermodynamics Answers

For a system of expanding gas, write down the equation for positive and negative work, give examples and diagram of any.

Precisely one million molecules strikes a surface with an area of 1.00×10^-2 m^2 in one second and bounce elastically. each of these molecules strike at an angle of 60° from normal, each has a mass of 3.30×10^-27 kg, and the average speed of these million molecules is 330 m/s. i) what is the magnitude of total momentum of the molecules before they strike the surface? How large is its component perpendicular to the surface? ii) what average pressure do these molecules exert on this surface during the one second they are striking it?

I have a small electric oven. It has three slots: upper, medium, lower with heating elements above and below. If I place the grill in the upper slot to toast some bread slices, they will get more heat if I put the crumb-gathering metallic deck in the lower slot (close to the heating element) or in the middle slot (close to the grill with the bread slices)??? Thanks!

Find the value of absolute zero on the Fahrenheit scale

Some Gun fanciers made their own bullet which involves melting and casting the lead slugs. How much heat transfer is needed to raise the temperature and melt 0.5kg of lead starting from 25°C?

To help prevent frost damage, 4kg of 0°c water is sprayed unto a fruit tree.
How much heat transfer occurs as the water freezes?
How much would the Temperature of the 120kg tree decrease if this amount of heat is transferred from the tree assume that no face change occur(SHC of the tree as 3.35j/kj/k)

To help prevent frost damage, 4kg of 0°c water is sprayed unto a fruit tree.
How much heat transfer occurs as the water freezes?
How much would the Temperature of the 120kg tree decrease if this amount of heat is transferred from the tree(assume that no face change occur) (SHC of the tree as 3.35j/kj/k)

Some Gun fanciers made their own bullet which involves melting and casting the lead slugs. How much heat transfer is needed to raise the temperature and melt 0.5kg of lead starting from 25°C

4 gm of a gas occupy 22.4 litres at into . The specific heat of gas at constant vol is 5 j/k .if speed of any quantity x of gas is at into is 952m/s. Then heat capacity at constant pressure is(R=8.3j/k/mol)

An ideal gas expands adiabatically to three times it's original volume.in doing so,the gas does 720joules of work..How much heat flows from the gas and what is the change in internal energy of the gas and does it's temperature rise or fall?