Molecular Physics | Thermodynamics Answers

By how much would you need to heat a 3 meters bar of zinc to make it expand by 5 cm?

Four forces act on a point 150 gm SE, 300 gm due S 60° W . 280 gm due W 

and 180 gm 60° S of E. (a) What single force will replace the four forces? (b) What 

single force (called the equilibrant) would balance the four forces? Solve algebraically

*A 20°C a steel ball has a diameter of 0.7cm while the diameter of a hole in a aluminum plate is 0.699cm at what temperature the same for both will the ball just pass through the hole?*

Linear expansivity of steel 11e-6

Linear expansivity of aluminum 23e-6

Calculate the number of joules given off when 32.0 grams of steam cools from 110.0 °C to ice at -40.0 °C.

What is the force when an object exerts 20 Pa pressure on a square surface of side 12m?

A thermometer contains 3.00 g of mercury. After it gains 8.4 J of energy  the mercury has reached the 5.00°C mark. What was the initial  temperature of the mercury?

An ideal gas with gamma=1.30 occupies 7.0 L at 300 K and 200 kPa pressure.

It is compressed adiabatically to 1/7 of its original volume, then cooled at constant volume to 300 K, and finally allowed to expand isothermally to 7.0 L.

How much work does the gas do during this process?

A. -980 J

B. 6400 J

C. -270 kJ

D. -6400 J

E. None of the above.

If 15.0 g of Ice at -25.0°C is mixed with a mass of antifreeze initially at  -3.00°C. If the final temperature of the mixture is -10.0°C, how much  antifreeze is present (Cantifreeze=2.24 x 102 J/KgoC)?

How much heat is lost by 2.50 kg of sand on a beach if the warmest part  of the day is 35.0°C and it cools to 3.00°C at night (c=840 J/kgoC)?

What substance can gain 40.0 kJ and only gain 25°C if 1.616 kg of the  substance is present?