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A column of soldiers, marching at 133paces per minute, keep in step with the beat of a drummer at thehead of the column. It is observed that the soldiers in the rearend of the column are striding forward with the left foot when thedrummer is advancing with the right. The speed of sound in the airis 343 m/s. What is the approximate length of the column?
A helium-neon laser (? = 632.8 nm) is used to calibrate a diffraction grating. what is the spacing between adjacent grooves in the grating
The human lungs can function satisfactorily up to a limit where the pressure difference between the outside and inside of the lungs is 1/22 of an atmosphere. how far below the water can she swim
An astronaut is traveling in a space vehicle that has a speed of 0.515c relative to Earth. The astronaut measures his pulse rate at 69.0 per minute. What pulse rate does the Earth observer measure
Four identical particles of mass 0.608 kg each are placed at the vertices of a 4.08 m x 4.08 m square and held there by four massless rods, What is the rotational inertia of this rigid body
A person stands at a point P relative to two plane mirrors oriented at 90°. How far away do the person's images appear from each other to the viewer? (Let d = 5.0 m.
To develop muscle tone, a woman lifts a 4.00 kg mass held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. How much work does she do
The triangular loop of wire in the drawing carries a current of I= 6.91 A. A uniform magnetic field is directed parallel to the side AB of the triangle and has a magnitude of 2.77 T.
A blacksmith cools a 1.30-kg chunk of iron, initially at a temperature of 650.0?C, by trickling 15.0?C water over it. How much water did the blacksmith trickle over the iron
A 4.50 kg package slides 1.30 m down a long ramp that is inclined at 10.8° below the horizontal. Calculate the work done on the package by gravity
A 5-kg mass moves under the influence of a force F=(2e^t ?)N, where t is time. What is the particle's position as a function of time
Hoover Dam on the Colorado River is the highest dam in the United States at 221 m, with an output of 1300 MW. Calculate the power in this flow
A U-shaped pipe contains water and oil - water filling one arm of the U and oil filling the other. determine the density of the oil
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