Rotational and Angular Speed

A turn-table on a frictionless vertical axis has a radius of 1.5 m and a moment of rotational inertia of 150 kgm^2. It is at rest until a 75 kg person who had been standing still (and who can be treated as a point), begins to walk around the rim at a speed of 2.0 m/s with respect to the turn-table. a) what is the speed of the p ...continues

Boiler saftey valves

NOTE: MOVED FROM MECHANICAL ENGINEERING TO PHYSICS BECAUSE MECHANICAL OTAs UNABLE TO ADDRESS IN TIME. An HRT boiler burning gas with 5.9MJ calorific value and 34m^2 of heating surface not exceeding 1200 kpa,needs safety valves.Find the code requirement for a)safety valve capacity b)max diameter of surface for connection c)ma ...continues

Venturi meter readings sphere density.

NOTE: MOVED FROM MECHANICAL ENGINEERING TO PHYSICS BECAUSE MECHANICAL OTAs UNABLE TO ADDRESS IN TIME. 1a) A venturi meter has 0.02556m^3 of flow per second through its 45mm dia throat.If the pipe is 58mm in diameter,what will the differential reading of mercury across it be? b)A metal sphere 60mm ...continues

Conduction

In an electrically heated home, the temperature of the ground in contact with a concrete basement wall is 12.8 degrees Celsius. The temperature at the inside surface of the wall is 20.0 degrees Celsius. The wall is 0.10m thick and has an area of 9.0m^2. Assume one kilowatt hour of electrical energy costs $0.10. How many hour ...continues

Conduction

A skier wears a jacket filled with goose down that is 15mm thick. Another skier wears a wool sweater that is 5.0mm thick. Both have the same surface area. Assuming the temperature difference between the inner and outer surfaces of each garment is the same, calculate the ration (wool/goose down) of the heat lost due to conduct ...continues

Working with linear thermal expansion.

A steel aircraft carrier is 370m long when moving through the icy North Atlantic at a temperature of 2.0 degrees Celsius. By how much does the carrier lengthen when it is traveling in the warm Mediterranean Sea at a temperature of 21 degrees Celsius?

Working with mass and heat to calculate a final temperature.

A 10.0 kg block of ice has a temperature of -10.0 degrees Celsius. The pressure is one atmosphere. The block absorbs 4.11 * 10^6 J of heat. What is the final temperature of the liquid water?

Calculating various properties, such as molecular mass and moles of a chlorophyll-a molecule.

The chlorophyll-a molecule, C55H72MgN4O5, is important in photosynthesis. (a) Determine its molecular mass (in atomic mass units). (b) What is the mass (in grams) of 3.00 moles of chlorophyll-a molecules?

Working with the ideal gas law.

At the start of a trip, a driver adjusts the absolute pressure in her tires to be 2.81 * 10^5 Pa when the outdoor temperature is 284K. At the end of the trip she measures the pressure to be 3.01 * 10^5 Pa. Ignoring the expansion of the tires, find the air temperature inside the tires at the end of the trip.

Working with pressure, height, and Kelvins in a gas-filled cylinder.

A frictionless gas-filled cylinder is fitted with a movable piston. The block resting on the top of the piston determines the constant pressure that the gas has. The height h is 0.120 m when the temperature is 273K and increases as the temperature increases. What is the value of h when the temperature reaches 318K?