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The element lead, Mass = 207.2 g/mol , has a density of 11.35 g/cm3. Find the number of atoms per cubic centimeter. If the total gamma ray cross section at 3 MeV is 14 barns, what are the linear attenuation coefficient and the half-thickness?
The driver of a car going at 68miles/h suddenly sees a truckahead at 60 m moving slowly at 23 miles/h in the samedirection. By slamming on to the brakes, the driver of thecar achieves a maximum deceleration of 5m/s^2.
Two dogs pull horizontally on ropes attached to a post; the angle between the ropes is 69.0. Find the angle the resultant force makes with the rope of dog A
A boat must cross a 260-m-wide river and arrive at a point 110 m upstream from where it starts, What is the speed of the boat in still water
Consider n equal positively charged particles each of magnitude Q/n placed symmetrically around a circle of radius a. (a) compute the magnitude of the electric field at a point a distance x from the center of the circle and on the line passing during..
Suppose a cart was given a push down a ramp, starting at the end close to the motion detector, Describe what the acceleration vs. time graph will look like for this case, Explain why the two graphs would be the same or different
A uniform ladder 10.0 m long is leaning against a frictionless wall at an angle of 60.0° above the horizontal. find the magnitude of the frictional force exerted on the ladder
two stationary positive point charges charge 1 of magnitude 3.10nc and charge 2 of magnitude 1.75nc are separated
A string of mass 0.0003kg/m and 0.5m long is vibrating 200 cycles per second. What must be the tension? What hanging mass would generate this tension? I got 12N for tension. Is this correct? And how would you solve for hanging mass.
In one cycle, a heat engine does 310 J of work and releases 620 J of heat to a lower-temperature reservoir. What is the efficiency of the engine
a rod extending between x0 and x14.0 cm has uniform cross-sectional area a9.00 cm2. its density increases between its
A coordinate system is chosen such that the sheets lie in the yz-plane, with sheet A at x = 0. A graph of the electric field as a function of x is shown at right below. Find the charge σB (sign and magnitude) of sheet B in terms of charge density ..
Find the airplane's acceleration. Calculates how much time elapses while the airplane covers that 44900 m.
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