Molecular Physics | Thermodynamics Answers

Find the spring constant k if the spring is stretched a distance 47 m by a suspended weight 19 N. The acceleration of gravity is 9.8 m/s^2. Answer in units of N/m.

A temperature difference of 5 K is equal to

Oil flows through a pipeline which contracts from 450mm diameter at A to 300mm diameter at B and then forks, one branch being 150mm diameter discharging at C and the other branch 225mm diameter discharging at D. if the velocity at A is 1.8 m/s and the velocity at D is 3.6 m/s, what will be the discharges at C & D and the velocity at B & C

The temperature of 200 g of water decreases from 20 °C to 0 °C in 10 minutes. Calculate

i. the heat lost by the water.

ii. the rate at which the water is losing heat.

iii. the time taken for the water at 0 °C to turn completely into ice.

A conducting and closed container of volume 300 litres contain an ideal gas at a high pressure Pinitial . Now using a pump , the gas it taken out at a constant rate 5 litre per sec . find the time in which the pressure inside the container decreases to Pinitial/100 .

Find the change in entropy when 1.25 kg of steam at 100°C condenses and cools to 50°C.

Problem 8:

A vertically downward force of magnitude 10 N is required to immerse a homogeneous object of weight 40 N completely in water. What is the density of the object?

One- half mole of helium is expanded adiabatically from an initial pressure 5atm and atmosphere of 500K to a final of 1atm. Find the temperature, final volume, the work done by the gas and the change in internal energy of the gas.

A scale reads 328 N when a piece of brass is hanging from it. What does it read (in N) when it is lowered so that the brass is submerged in water?

An oil drum with a diameter of 400mm and height of 2 meters is filled with water. calculate the force of pressure on the bottom of the tank.