A Newton’s Ring apparatus consists of a plano-convex glass lens that has a radius or curvature R=10.0 m and a diameter of 4.00 cm resting on a flat glass plate. The apparatus is illuminated from above by light from a sodium lamp that has a wavelength of 590 nm. How many bright fringes would you see in the reflected light?

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

1) what is the power in horsepower of a 100 watt light bulb? what is the power in kilowatts of a 200 horsepower engine? 2) if a cars engine is providing 3000 n of force to keep the car moving at 5 m/s, what is the engine’s effective power? 3) how many gallons of water will be pumped from a well 30 feet deep by a 1/2 hp engine in 1 minute? (1 gallon weighs 8.34 pounds)

The lid of a pressure cooker forms a nearly airtight seal. steam builds up pressure and increases temperature within the pressure cooker so that food cooks faster than it does in an ordinary pot. the system is defined as the pressure cooker and the water and steam within it. if 2.0 g of water is sealed in a pressure cooker and then vaporized by heating, and 5127 j must be added as heat to completely vaporize the water, what is the change in the system’s internal energy? answer in units of j.