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Q. A rotating door is made from four rectangular sections, as indicated in the drawing. The mass of each section is 80kg. A person pushes on the outer edge of one section with a force of F = 72N that is directed perpendicular to the section. Find out the magnitude of the door's angular acceleration.
A skier with a mass of 66kg starts from rest and skis down an icy (frictionless) slope that has th elength of 57 m at an angle of 32° with respect to the horizontal. At the bottom of the slope, path levels out and becomes horizontal, the snow beco..
A thin film with index of refraction n = 1.29 is placed in one arm of a Michelson interferometer, perpendicular to the optical path. If this causes a shift of 8.0 bright fringes of the pattern produced by light of wavelength 693nm, what is the film t..
A trough is 5 feet long and 1 foot high. The vertical cross-section of the trough parallel to an end is shaped like the graph of y=x10 from x=1 to x=1. The trough is full of water. Find out the amount of work in foot-pounds required to empty the t..
What is magnitude of the runners total displacement
pipe open at one end only has a fundamental frequency of 237 Hz. A second pipe, initially identical to the first pipe, is shortened by cutting off a portion of the open end. Currently, when both pipes vibrate at their fundamental frequencies, a beat ..
What minimum force is necessary to start the block moving up the wall? (Hint: The static frictional force is now directed down the wall.)
A person in an elevator is holding a 25 kg block by a cord rated to withstand a tension of 335 N. Starting from rest, the elevator begins to move upwards at a constant acceleration and the cord holding the block breaks. What was the least accelera..
A horse canters away from its trainer in a straight line, moving 150m away in 14 sec. It then turns abruptly and gallops halfway back in 4.5 sec.
A small, 300 g cart is moving at 1.60 m/s on an air track when it collides with a larger, 1.00 kg cart at rest. After the collision, the small cart recoils at 0.890 m/s.
What is the intensity of the sound waves at point.
Find the change in internal energy using first law of thermodynamics.
A box weighing 300N is shoved across the floor of an apartment by a force of 400 N exerted downward at an angle of 35.2° below the horizontal. If the coefficient of kinetic friction between the box and the floor is 0.540, how long does it take to mov..
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