Molecular Physics | Thermodynamics Answers

Can the specific heat at constant volume be greater than the specific heat at constant pressure. Justify by
applying the first law of thermodynamics.

1. How long would you expect a 2.5 kW heater to take to heat 0.6 L of water from 20 to 100°C if there were no heat losses.

2. How much water will boil away in the last 20 seconds of the heating?

where does the solids weigh more in air or in a liquid ?

A monoatomic ideal gas initially at 17°C is is suddenly compressed to one-eighth of its original volume. The temperature after compression is:
a)16°C b)17°C c)887°C d)none of these.

In a adiabatic change,the pressure and temperature of a monoatomic gas are related as P∞T^c.Here c equals: a)2/5 b)3/5 c)5/2 d)5/3.

Two identical cylinders contain Helium at 2.5 atm and Argon at 1 atm respectively.If both the gases are transferred in one of the cylinders,what will be the new pressure?

When the temperature of a thin silver [α = 19 × 10-6 (C°)-1] rod is increased, the length of the rod increases by 1.9 × 10-3 cm. Another rod is identical in all respects, except that it is made from gold [α = 14 × 10-6 (C°)-1]. By how much ΔL does the length of the gold rod increase when its temperature increases by the same amount as that for the silver rod?

A container can be made from steel [β = 36 × 10-6 (C°)-1] or lead [β = 87 × 10-6 (C°)-1]. A liquid is poured into the container, filling it to the brim. The liquid is either water [β = 207 × 10-6 (C°)-1] or ethyl alcohol [β = 1120 × 10-6 (C°)-1]. When the full container is heated, some liquid spills out. To keep the overflow to a minimum, from what should the container be made and what should the liquid be?

The cavity within a copper [β = 51 × 10-6 (C°)-1] sphere has a volume of 1.150 × 10-3 m3. Into this cavity is placed 1.100 × 10-3 m3 of benzene [β = 1240 × 10-6 (C°)-1]. Both the copper and the benzene have the same temperature. By what amount ΔT should the temperature of the sphere and the benzene within it be increased, so that the liquid just begins to spill out?

A piece of lead [c = 128 J/(kg·C°)] is heated from 18.0 °C to 30.6 °C. The same amount of heat is added to a piece of copper [c = 387 J/(kg·C°)]. The mass and initial temperature of the copper are the same as for the lead. Determine the final temperature Tf of the copper.