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If a sample of Na18F has an approximately constant activity of 1011 decays/sec over a time interval of 2 minute, and all of the emitted radiation energy is absorbed by 5 kg of body tissue, what is the equivalent dose?
a spring of constant 290nm is used to launch a 1.0kg block along a horizontal surface whose coefficient of sliding
a block of mass m1 2.00 kg on a frictionless inclined plane of angle 32.0deg is connected by a cord over a massless
A screen is placed among two lamps so that they illuminate the screen equally. The first lamp emits a luminous flux of 1445 lm and is 2.5 m from the screen. What is the distance of the second lamp from the screen if the luminous flux is 2375 lm?
an elastic collision between two bodies in which the collision is not head-on. Projectile particle m1 is an alpha particle and target m2 is an oxygen nucleus. Find the initial speed of the alpha particle
The sun radiates like a perfect blackbody with an emissivity of exactly 1. Calculate the surface temperature of the sun, given it is a sphere with a 7.00 x 108 m radius that radiates 3.80x1026W into 3 K space.
The cylinder of a bicycle pump has an interior diameter of 2.0 cm and a length of 40 cm. How far down (in cm) must you push the piston before air begins flowing into the tire
The dimensions of a rectangular block of brass (Young's modulus9.0x1010 N/m2, shear modulus3.5x1010 N/m2) are 0.012 m, 0.024 m, and0.048 m.
Design an attitude control nozzle for a spacecraft that produces 50.0 N of thrust using compressed helium gas stored at 50.0 MPa and 0.00°C.
A uniform horizontal beam has a mass of 241 kg and is 10.5 meters long. The beam also carries the following three loads: Load A: 4715 N, 1.26 meters from left end, What are the forces supporting the two ends of the beam
1.7 kilograms of water are changed from liquid water at 100?C into steam at 100?C. determine the change in mass of the water
Knowing that the initial angular velocity of the flywheel is 360 rpm counterclockwise, determine the vertical force P that must be applied to the pedal C if the system is to stop in 100 revolutions.
The wavelength of an electromagnetic wave is measured to be 2.50 x 10-7 m. What is the frequency of the wave?
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