Molecular Physics | Thermodynamics Answers

A system takes in 0.380 kJ of heat while it does 0.790 kJ of work on the surroundings. What is the change in internal energy of the system?

A pot containing 1.50 kg of water is sitting on a hot stove, and the water is stirred violently by a mixer that does 8.20 kJ of mechanical work on the water. The temperature of the water rises by 4.00°C. What quantity of heat flowed into the water from the stove during the process? The specific heat of water is 4.186 kJ/kg·K. 

what is the heat capacity of 100 kg of a coolant that has a specific heat capacity of 2420 J/KgK

A boy throws a baseball onto a roof and it rolls back down and off the roof with a speed of 3.80 m/s. If the roof is pitched at 24.0° below the horizon and the roof edge is 3.30 m above the ground, find the time the baseball spends in the air and the horizontal distance from the roof edge to the point where the baseball lands on the ground.

A scuba driver is in fresh water has a tank with a volume of 0.0100m^3. The air in the tank is initially at a pressure of 1.00×10^7 Pa. Assume that the driver breathes 0.500 L/s of air. Density of fresh water is 1.00×10^3 kg/m^3.

How long will it take the tank at depths of 2.70 m?

The inner tube of a Pyrex glass mercury thermometer has a diameter of 0.120 mm. The bulb at the bottom of the thermometer contains 0.420 cm³ of mercury. How far will the thread of mercury move for an increase of 1.00°C? Remember to take into account the expansion of the glass. Coefficient of Linear Expansion of Glass(Pyrex) is 3.25 × 10⁻⁶ K⁻¹ and Coefficient of Volume Expansion of Mercury is 182 × 10⁻⁶ K⁻¹.

At 0.0°C and 1.00 atm, 1.00 mol of a gas occupies a volume of 0.0224 m³.

If the gas is nitrogen (N₂), the principal component of air, what is the mass density? Molar mass of Nitrogen is 14.00674 g/mol.

At 0.0°C and 1.00 atm, 1.00 mol of a gas occupies a volume of 0.0224 m³.

 What is the number density?

At 0.0°C and 1.00 atm, 1.00 mol of a gas occupies a volume of 0.0224 m³.

Estimate the average distance between the molecules.

A garden hose attached with a nozzle is used to fill a 7-gal bucket. The inner diameter of the hose is 1”, and it reduces to ½” at the nozzle exit. If it takes 32 s to fill the bucket with water, determine the average velocity of water at the nozzle exit