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Estimate the thickness of lead shielding needed to reduce the exposure rate 2.5 m from a 5.92x10^11 Bq point source of Cs-137 to 1.0 mR/hr.
What is torque exerted by the fish about an axis
A ship's mast reaches to a height of 15 meters above the surface of a 10-meter-deep lake. When the sun is 30° above the horizon, how long will the shadow of the mast be on the bottom of the lake?
Chromium is produced by reacting its oxide with aluminium. If 354 g of Cr2O3 and 158 g of Al react to form 204 g of Al2O3, how many grams of Cr are formed.
Two simple pendulums have length of 81-cm and 64-cm they are released from the same angular position at the same instant. After how much time would they both arrive at their initial position simultaneously.
What is wave number
Winds pick up suddently,increasing the wave's amplitude to 6m. Explain how does this change in amplitude affect the wave's frequency and the amount of energy it transports?
What is an average velocity of the train throughout run
A spacecraft is traveling with a velocity of v0x = 4330 m/s along the +x direction. Two engines are turned on for a time of 728 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.74 m/s2.
A 105-kg water skier floating in a lake is pulled from rest to a speed of 14 m/s in a distance of 25m. What is the net force exerted on the skier, assuming his acceleration is steady.
A 78-kg man standing on a scale in an elevator notes that as elevator rises, the scale reads 834 N. What is the acceleration of the elevator.
Find out the altitude of the plane
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