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Q. The interatomic spring stiffness for tungsten is determined from Young's modulus measurements to be N/m. The mass of one mole of tungsten is kg. If we model a block of tungsten as a collection of atomic "oscillators" (masses on springs), what is one quantum of energy for one of these atomic oscillators? Note down that since each oscillator is attached to two "springs", and each "spring" is half the length of the interatomic bond, the effective interatomic spring stiffness for one of these oscillators is times estimated value given above.
Superman meets an asteroid in outer space and hurls it at 90m/s. The asteroid is five hundred times more massive than Superman is. In the strip, Superman is seen at rest after throw. Taking physics into account, what would be his recoil speed.
A converging lens has a focal length of f = 22.0 cm. An object is placed 41.0 cm from the lens. Find the size of the image in cm if the object has a height of 4 cm. express answer with one decimal place.
A model airplane with mass of 0.754 kg is tethered by a wire so that it flies in a circle 29.5m in radius. The airplane engine provides a net thrust of 0.796 N perpendicular to tethering wire.
The 2.0 kg, 20 cm diameter disk is spinning at 320 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 2.0 s.
What distance does baseball move before its release
assume the roller coaster (h1 = 37 m, h2 = 13 m, h3 = 30) passes point A with a speed of 3.10 m/s. If the average force of friction is equal to one third of its weight, with what speed will it reach point B? The distance traveled is 55.0 m.
What is the terminal speed at which the bar falls.
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 ..
While standing on a bridge 45m above the ground, you drop a stone from rest. When the stone has fallen 4.90m, you throw a second stone straight down. What initial velocity should you give the second stone if they are both to reach the ground at th..
A 5.00--long ladder has mass 12.5 kg and is leaning against a frictionless wall, making a 64 degree angle with the horizontal. If the coefficient of friction between the ladder and ground is 0.42, what is the mass of the heaviest person who can safel..
A baseball pitcher throws a fastball at a speed of 45.00m/s. The acceleration occurs as the pitcher holds the ball in his hand and moves it throughout an almost straight-line distance of 4.0 m. compute the acceleration; assume that it is constant ..
find the coefficient of linear expansion for the material of which the rod is made.
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