Molecular Physics | Thermodynamics Answers

A body vibrating with simple harmonic motion has a frequency of 4Hz and an amplitude of 0.15m.
Calculate
1. The maximum values of the acceleration and velocity
2. The acceleration and velocity at a point 0.09m from the equilibrium position of motion

A Zinc rod is measured by means of a brass scale (which is correct at 0 degree) and is found to be 1.0001 metres long at 10 degrees. What is the real length of the rod at 0 degree and at 10 degrees? Mean linear expansivity of the Zinc and is 0.000029 per K and of brass is 0.000019 per K.

A metal tape correct at 30 degrees is used to measure the length of field on a day when the temperature is 20 degrees. How does this affect the result.? What is the error measuring a distance of 10meters? The linear expansivity of the metal is 18x10 raise to power of - 6 per k.

Room temperature is 10 ° C and relative humidity 75%. Temperature raised to 20 ° C. What is the relative humidity of the air now? How much water should be added to the air to get 50% relative humidity? The temperature remains constant.

A volume of 150 m3 of room air contains 1800 g at 22 ° C water vapor. What is the relative humidity of room air? Pressure 101.3 kPa.

The compression ratio of one diesel engine is 21. In the initial state, the air pressure is 100 kPa and temperature 15 ° C. The compression is adiabatic. Specify without a) end temperature and pressure; and b) indoor air change and the volume of modification. For air cv = 0.714 kJ / kgK.

The specific volume of water vapor at 100 ° C and 101.3 kPa is exactly 1.672 m³ / kg. How big a mistake will be made if the specific volume is calculated on an ideal gas equation?

The water in the water heater is heated at 80 ° C overnight and its average temperature must not fall below 55 ° C. How much water should be in the reservoir to store 25 kWh of thermal energy? The reservoir's own thermal capacity should be insignificant.

500 g of water at 18 ° C and 0 g of 80 g of ice cubes are added. Dish own heat capacity is 100 J / K. Do you melt everything? If it melts, then what is the temperature of the final state, and if not melt, how much ice will remain without melting?

The diameter of the round brass rod is 30.05 mm and the steel ring the inner diameter is 30.00 mm at 20 ° C. At what temperature the steel ring must be heated to fit the brass rod inside?