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(a) A certain medical machine emits x-rays with a minimum wavelength of 0.02 nm. One day, the machine has an electrical problem and the voltage applied to the x-ray tube decreases to 78% of its normal value. Now what is the minimum x-ray wavelength produced by the machine?
lmin = ___________ nm
(b) What is the maximum x-ray energy this machine (with electrical problems) can produce?
Emax = _____________ eV
(c) The atomic number of an element is 82. According to the Bohr model, what is the energy of a Ka x-ray photon?
E = ____________ eV
a 0.40kg basketball is thrown horizontally against a board with a velocity of 20m/sec. If the ball rebounds with a speed of 15m/sec. What is the impulse of the ball
an astronaut weighs 1000N on the surface of the earth(radius = 6.38*10^6m) what is the weight of the astronaut at the elevation of 620 km above the earth's surface
A 45.6-kg girl is standing on a 155-kg plank. Both originally at rest on a frozen lake that constitutes a frictionless, flat surface. The girl begins to walk along the plank at a constant velocity of 1.40 m/s relative to the plank. (a) What is the ve..
An automobile starter motor will draw 180A from the 12V battery of a car for perhaps 2 seconds in the process of starting the gasoline engine. How much power does it use
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You are designing an elevator for a hospital. The force exerted on a passenger by the floor of the elevator is not to exceed 1.57 times the passenger's weight. What is the maximum speed of the elevator
An archaeologist uses carbon dating to find the age of some ancient fossils. Determine the fossil age
The pulmonary artery, which connects the heart to the lungs, has a radius of 2.6 mm and is 8.4 cm long. what is the speed of the blood in this artery
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