Molecular Physics | Thermodynamics Answers

An object of density 300kgm-3 and volume of 0.001m3 is immersed in a water of density 200kgm-3, take g to be equal to 9.8m/sec2.determine;
(a):the weight in air
(b):the weight inside the water
(c):the upward force exerted by the water
(d):relative density

why the temperature of hot water decreased when cold water was added

A large beaker is filled with ice cold water and is placed in a larger vessel containing a mixture of ice and water at zero degree temperature. A lump of aluminum weighing 120g initially cooled to -70C is then suspended inside the beaker. Explain why ice is formed on the aluminum lumps and not on the walls of the beaker.
Calculate the maximum weight of ice which can form on the aluminum = 9.10 x 10^2 Jkg^-1k^-1

estimate the number of molecules in 3.00m^3 of air by assuming that it has a density of 1.21kg/m^3 and that is entirely composed of nitrogen molecules

A bimetallic strip is usable as a thermometer because of

0.3kg of air at pressure of 350kN/m2 and a temperature of 35 oC receives heat energy at constant volume until its pressure become 700kN/m2. it then receives heat energy at constant pressure until its volume become 0.2289m3. determine the change of entropy during each process. take Cp = 1.006kJ/kgK and Cv = 0.717kJ/kgK

A metal bowl with a weight of 1.65 N is placed in a larger kitchen container filled with coconut oil. How much coconut oil must the bowl displace in order to float? For reference, the mass density of coconut oil is about 903 g/liter and its weight density is about 8.85 N/liter

What are ferroelectric materials? Explain with the example of BaTiO3. How are
they different from piezoelectric materials?

Calculate the mass of boron required to make a silicon crystal with 10^16
/cm^3
doping density, if the initial melt load of silicon is 50 kg. The density of silicon in
the melt is 2.5 g/cm^3
and boron has an atomic weight of 10.8 u. Assume that the
equilibrium segregation coefficient is constant throughout the growth process.

whats the quantity of heat given out if a bar of brass of mass 350g is cooled from 95°c to 20°c (specific heat capacity of brass= 380j/kg–¹k–¹)