Molecular Physics | Thermodynamics Answers

an iron rod is length 50m when the temperature is 20 degree celcuis by how much will it expand when the temperature rises to 30 degree celcuis

An echo is heard from a building 0.721 s after you shout "hello." How many feet away is the building if the air temperature is 21.5°C?

A blacksmith dropped a 1.5kg iron bead at 300°C into some quantity of water. If the temperature of the water rose from 15°C to 180°C, calculate the mass of the water. (specific heat of iron = 0.46J/kg/C) (water= 4.2*10^3J/kj/C)

A large balloon used to sample the upper atmosphere is filled with 525 m3 of hydrogen. What is the mass of the hydrogen (in kg)?

Consider a mixture of equal number of non-interacting single atomic gas and diatomic gas. The internal energy per particle is given by :
(A) 2kT
(B) 4kT
(C) 3/2kT
(D)5/2kT

The degeneracy of spectral term 3F is
(A) 7 (B) 9
(C) 15 (D) 21

A reversible adiabatic process is
(A) Isobaric (B) Isochronic
(C) Isentropic (D) Isothermal

When you are purchasing clothes ,seller measure it's area using meter scale made of steel . When you buy in winter it was ok but when you buy in summer you will get what:
Loss
Profit
Nothing

Carnot refrigeration cycle absorbs heat at 280k and rejects heat at 310k.
a: Calculate the coefficient of performance of this refrigeration cycle.
b: If the cycle is absorbing 1120KJ/min at 280k, how many KJ work is required per second .
C: If the carnot heat pump operates between the same temperature as the above refrigerator, what is the coefficient of performance ?
d: How many KJ/min will the heat pump deliver at 310k if it absorb 1120 KJ/min at 280k.

A Carnot engine has a power output of 163 kW. The engine operates between two reservoirs at 31◦C and 469◦C.
1. How much thermal energy is absorbed each hour? Answer in units of J.
2. How much thermal energy is lost per hour? Answer in units of J.