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When you "crack" a knuckle, you cause the knuckle cavity to widen rapidly. This, in turn, allows the synovial fluid to expand into a larger volume. If this expansion is sufficiently rapid, it causes a gas bubble to form in a process known as cavitation. This is the mechanism responsible for the cracking sound. If a "crack" produces a sound with an intensity level of 57 dB at your ear, which is 18 cm from the knuckle, how far from your knuckle can the "crack" be heard? Assume the sound propagates uniformly in all direction, with no reflections or absorption.
Why is it tiring to push hard against a solid wall? When a person pushes hard on a solid wall, is work done?
An astronaut is traveling in a space vehicle that has a speed of 0.500c relative to Earth. The astronaut measures his pulse rate at 74.0 per minute. Signals generated by the astronaut's pulse are radioed to Earth when the vehicle is moving perpend..
A man is pulling a 40.0 kg crate across a level floor with a horizontal force, and the coefficient of kinetic friction is ?k = 0.59 for the crate and the floor. What is the normal force acting on the box
a horizontal rifle is fired at a bulls -eye. the muzzle speed of the bullet is 670ms the gun is pointed directly at the
A roller coaster car rolls down a frictionless track, reaching a speed V0(Velocity original) at the bottom. by what factor must you increase the height of the track
A particle possessing 8.25 uC of charge and mass 8.55 g is fired at a speed of 255 cm/s through two charged plates of length 34.6 cm, calculate the distance y in which the charge falls below its intended path
a single conducting loop of wire has an area of 8.0 10-4 m2 and a resistance of 110 omega. perpendicular to the plane
Describe normal anatomy/physiology of muscle contraction emphasizing the utilization of ATP in this process - Describe the difference between fast oxidative, slow oxidative, and fast glycolytic fibers.
A hot piece of copper (cc = 386J/kg·K) of mass mc = 3kg and unknown initial temperature Tc is dropped into a container of water (cw = 4186 J/kg · K) of mass mw = 1 kg, What is the initial temperature Tc of the copper
a if a toaster is plugged into a source of alternating voltage with an rms value of 163 v an rms current of 8.29 a
a 0.40kg soccer ball approaches a player horizontally with avelocity of 20m/s to the north. what impulse was delivered by the player
A small vertical mirror hangs on the wall, 1.20 m above the floor. What was the change in the Sun's angle of elevation between your two observations
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