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A collimated gamma ray beam consists of equal numbers of 0.1 MeV and 1.0 MeV photons. If the beam enters a 5 cm thick lead shield, what is the relative portion of 1 MeV photons to 0.1 MeV photons in the emergent beam? State the source of all values used & show your work.
The seed has a mass of 250 mg., a functional lift-to-drag ratio of 4.0, a lift coefficient under the same conditions of 0.3, and a wing area of 5000 mm2. How long will it take to hit the ground
A 60.0cm long hollow nichrome tube of inner diameter 2.20mm, What is the current in the tube
The position of a hydrogen atom (m=1.7x10-27) isknown to within 2.0x10-6m. What is the minimumuncertainy in the atom's velocity
A grade school student plans to build a 31-power telescope as a science fair project. What focal length is needed for her objective lens
A mountain climber jumps a 2.4 -wide crevasse by leaping horizontally with a speed of 7.2. find the height difference between the two sides of the crevasse
A crying baby emits sound with an intensity of 8 × 10-8 W/m2. What is the intensity level for a set of twins? The lowest detectable intensity is 10-12 W/m2
Water is moving with a speed of 2.0 m/s through a perfectly sealed long pipe with a cross sectional area of 8 cm^2. The water descends 9 m as the pipe changes in area to 6 cm^2.
Megan's mass is 28kg. She climbs the 4.8m ladder of a slide and reaches a velocity of 3.2m/s at the bottom of the slide. How much work was done by friction on Megan? Assume that air resistance is negligible.
A certain projectile is launched with an initial speed v0. At its highest point its speed is v0 / 4. What was the launch angle
A boy throws up a ball 15m/s, how high will the ball go and what is the duration (total time) in the air from throw to catch
you and a close friend stand facing each other. you are as close as you can get without actually touching. if each of
determine the largest angle MAX that the crutch can have just before it begins to slip on the floor.
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