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A point source of 6MeV photons is embedded at the center of a lead sphere having a radius of 8cm. Calculate or estimate, to some reasonable engineering accuracy, the fraction of photon energy emitted by the source that leak out of the sphere.
A generator delivers an AC voltage of the form ?v = (64 V) sin (75?t) to a capacitor. The maximum current in the circuit is 1.50 A. Find the rms voltage of the generator
Two adjacent natural frequencies of an organ pipe are found to be 1260 Hz and 1350 Hz. Calculate the fundamental frequency and length of this pipe
an 15.0-kg box is released on a 35.0 incline and accelerates down the incline at 0.290m/s^2, Find the friction force impeding its motion
two object are connected by a massless string that passes over an ideal pulley. calculate the two components of the force of weight for the object on the incline plane
When jumping straight down, you can be seriously injured if you land stiff-legged. find the average net force that acts on him during this time
A red blood cell typically carries an excess charge of about -2.5 × 10-12 C distributed uniformly over its surface. What is the surface charge density on the red blood cell
The electric field midway between two identical but opposite point charges is 886 N/C, and the distance between the charges is 23 centimeter. Obtain the magnitude of the charge on each
A playground is on the flat roof of a city school, 7.00 m above the street below. The vertical wall of the building is 8.00 m high, forming a 1.00 m high railing around the playground. Find the speed at which the ball was launched
A block sliding to the right along a horizontal frictional surface has an initial velocity of 13.8m/s and stops in 135m due to friction with the surface. Find the acceleration of the block
A 7130-kg car is travelling at 25.8 m/s when the driver decides to exit the freeway by going up a ramp. What is the magnitude of the average drag force exerted on the car
A 200 g block is pressed against a spring of force constant 1.4 k N/m until the block compresses the spring 10 cm, the spring rests at the bottom of a ramp inclined at 60 degrees to the horizontal.
It takes only 9.12N of force to hold up a 1KG metal crown in water, Compute the specific gravity of this metal, and guess what element it might be using a density table
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