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A particular radioactive source produces 125 mrad of 1 MeVgamma rays per hour at a distance of 1.0 m.
(a) How long could a person stand at thisdistance before accumulating an intolerable dose of 1 rem?
h
(b) Assuming the gamma radiation is emitted uniformly in alldirections, at what distance would a person receive a dose of5 mrad/h from this source?
m
The froghopper, Philaenus spumarius, holds the world record for insect jumps. What horizontal distance did the froghopper cover for this world-record leap
Four equal charges of +4.9×10-6 C are placed on the corners of one face of a cube of edge length 7.0 cm. A charge of -4.9×10-6 C is placed at the center of the cube. What is the magnitude of the force on the charge at the center of the cube?
At time t=0, a 2650kg rocket in outer space fires an engine that exerts an increasing force on it in the + x direction. What impulse does the engine exert on the rocket during the 1.50s interval starting 2.00s after the engine is fired
Assuming the sun to be a blackbody with a surface temperature of 6000K, Determine the loss in solar mass per day due to this radiation
A light spring of force constant k = 156 N/m rests vertically on the bottom of a large beaker of water. A 5.55-kg block of wood (density = 650 kg/m3) is connected to the spring, and block-spring system is allowed to come to static equilibrium. Wha..
As a 16,500 kg jet plane lands on an aircraft carrier, its tail hook snags a cable to slow it down. what was the plane's landing speed
A 144-g baseball mobing 28.0 m/s strikes a stationary 5.25 kg brick resting on small rollers so it moves without significant friction. What is the baseball's speed after the collision
While running home from second base a 67 kg runner rounds third base at a speed of 3.1 m/s, What is the centripetal force of this turn on third base
A 0.300 kg ball is thrown vertically upward with an initial speed of 16.0m/s. What is the maximum height reached by the ball
A cubic centimeter in a typical cumulus cloud contains 50 to 500 water drops, which have a typical radius of 10 µm. How much mass does the water in the cloud have
If 18.35 mol of helium gas is at 11.6 degrees C and a gauge pressure of 0.371 atm. Calculate the temperature if the gas is compressed to precisely half the volume at a gauge pressure of 1.22 atm.
The combination of an applied force and a friction force produces a constant total torque of 36.8 N · m on a wheel rotating about a fixed axis. Find the magnitude of the torque due to friction
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