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A microwave oven is powered by an electron tube called a magnetron, which generates electromagnetic waves of frequency 3.46 GHz. The microwaves enter the oven and are reflected by the walls. The standing wave pattern produced in the oven can cook food unevenly, with hot spots in the food at antinodes and cool spots at nodes, so a turntable is often used to rotate the food and distribute the energy. If a microwave oven intended for use with a turntable is instead used with a cooking dish in a fixed position, the antinodes can appear as burn marks on foods such as carrot strips or cheese. The separation distance between the burns is measured to be 4 cm 5%. From these data, calculate the speed of the microwaves.
Frank and Mary are twins, and Mary wants to travel to our nearest star system, Alpha Centauri (4.30 lightyears away). How old will Frank be when she returns
Two traveling sinusoidal waves are described by the wave functions, What is the amplitude of the resultant wave, What is the frequency of the resultant wave
A laser used in eye surgery emits a 3.08 mJ pulse in 1.04 ns, focused to a spot 32.4 um in diameter on the retina. Calculate (in SI units) the power per unit area at the retina
A constant horizontal force Fa pushes a 2 kg FedEx package across a frictionless floor on which an xy coordinate system has been drawn. It gives package's x and y velocity components versus time t. What is the magnitude of Fa.
question1a car moves along a road in such a way that the distance x travelled in a time t is given byx a bt 3where a
A 265.0 kg block of ice at 0o C is placed in a large lake. The temperature of the lake is just slightly higher than 0o C, and the ice melts. What is the entropy change of the lake
The locomotive is moving at 25 km/h. The engineer of the high speed train immediately applies the brakes. What must be the magnitude of the resulting constant deceleration if a collision is to be just avoided.
Assume that the mud ends up uniformly distributed over a surface area of the valley measuring 0.3 km x 0.3 km, What is the mass of the mud sitting above a 4 m2 area of the valley floor
Puffy cumulus clouds, which are made of water droplets, occur at lower altitudes in the atmosphere. Wispy cirrus clouds, compute altitude above which wispy cirrus clouds can occur
A 528 Hz sound wave travels through a substance. The wavelength of the sound wave is measured to be 3.2 meters
The second hand of a clock has a length of 0.30 m. Evaluate what distance does the tip of the second hand sweep through in 3 minutes and 45 seconds?
A guitar string is 90.0 cm long and has a mass of 3.23g. find the frequencies of the fundamental and first two overtones
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