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The average output power of a cellular phone, which can be treated as a point of E-M waves, is 1.0W when it is "ON".
(a) Estimate the intensity of the phone's E-M waves in your brain, which is about 1.0 cm away from the phone when it used directly against your ear;
(b) Compare it with the intensity in a 400-W microwave oven, whose area of cross-section is A = 0.25m X 0.20m.
(c) Estimate the peak electric field E(p) in above two situations.
What is the stopping distance of the car. What is the initial (horizontal) velocity of the ball.
The frequency doubled output of a Nd3+ YAG laser has a wavelength of 532nm. If each pulse of light has a total energy of 0.550J and the repetition rate of the laser is 30Hz, how many photons does the laser emit at 532nm in 3 minutes.
Physics - Mechanics - Buoyant Force, An undersea research chamber is spherical with an external diameter of 5.40 m. The mass of the chamber, when occupied, is 70400 kg.
The magnitude of a force vector is 80.4 newtons (N). The x component of this vector is directed along the +x axis and has a magnitude of 72.6 N.
Calculate the velocity of the object for an elapsed time of t=1s. Use the formula v=v0+at, these use the v0,and the value for acceleration you determined in previouse step. PROBLEM:V=Vo+at Vo is 3.8 m/s a=1.2m/s^2
Compute the x-coordinate of the center of mass XCM. Suppose that the mass of the rod is small enough to be ignored in your calculation. Your answers must be accurate to within 0.1 cm.
What is the centripetal acceleration of a helicopter flying in a horizontal circle of a diameter 510 m at a speed of 120 m/s
find the speed of the test charge. find the distance the car travels during this time in m.
A person wearing a safety belt can withstand an acceleration of -3.0 x 10^2 m/s2. How thick must barriers be to safely stop a car that hits a barrier at 112 km/h.
Two identical piano wires have a fundamental frequency of 640 Hz when kept under the same tension. What fractional increase in the tension of one wire would lead to the occurrence of 10 beats/s when both wires oscillate simultaneously.
A man pulls a crate of mass 75.0 kg across a level floor. He pulls with a force of 180.0 N at an angle of 26.0° above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 130.0 N. If the cr..
A mole of air in a closed container is initially at 300k. Suppose that you now add 10 J of heat to the air, without doing any work on it, what is the total thermal energy of the air
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