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A 21.5-g bullet is fired from a rifle. It takes 2.15 10-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 620 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet.
An outboard motor for a boat is rated at 36 hp h. If it can move a particular boat at a steady speed of 30 km/h , what is the total force resisting the motion of the boat
Two concentric metallic spheres of radii r1 and r2> r1, respectively, are maintained at temperatures T1 and T2, and are separated by a layer of homogeneous material thermal conductivity k.
An airplane can be made invisible to radar by coating the plane with a thin layer of an antireflective material. If radar waves have a wavelength of 3.0 cm.
a Hydrogen atom is in the gound state. it absorbs some energy, leaving the atom in an excited state, calculate the wavelength of the second photon
what is the voltage across the capacitors?
A dart is thrown horizontally toward the bull's-eye, point P on the (non-standard size) dart board in the figure, with an initial speed of 8.9 m/s. It hits at point Q on the rim, vertically below P 0.14 s later. What is the distance PQ? How far aw..
student is running at her top speed of 5.2m/s to catch a bus, which is stopped at the bus stop. For what distance does she have to run in that case
A crate of 48.0 tools rests on a horizontal floor. You exert the gradually increasing horizontal push on it and observe that the crate just begins to move while your force exceeds 344. After that you must reduce your push to 260 to keep it moving at ..
A doorway acts as a single slit for light that passes through it, but a doorway is much larger than the wavelength of visible light, Estimate the width of the doorway
If i have a hollow copper sphere that has an outer diameter of 20.00 cm that is floating so that everything is just submerged in a bucket of water
n AC voltage of the form ?v = 100 sin 1 000t, where ?v is in volts and t is in seconds, is applied to a series RLC circuit. Find the average power in Watts delivered to the circuit
A 0.5 kg mass attached to a linear spring, with spring constant 5 N/m and damping constant 0.2 kg/s, What is the natural frequency of oscillation
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