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The number of molecules crossing a unit area per unit time in one direction is given by
where n is the number of molecules per unit volume and v is the average molecular velocity.
As the average molecular velocity is approximately equal to the speed of sound in a perfect gas, estimate the number of molecules crossing a circular hole 10-3 in. in diameter.
Assume that the gas is at standard conditions. At standard conditions, there are 4 × 1020 molecules per in.3.
An object is located 8.00 cm from a converging lens that has a focal length of 10.0 cm. The height of the object is 0.67 cm. What is the height hi of the image
Over the course of a multi-stage 4520 kilometer bicycle race, the front wheel of an athlete's bicycle makes 2.18 x 106 revolutions. Evaluate how many revolutions would the wheel have made
Two polarizers are oriented at 42o to each other and apolarized light is incident on them. If only 16 percent of thelight gets through both of them, what is the angle between theinitial polarization direction of the incident light and the firstpolari..
A particle's velocity is described by the function vx= t^2? 9t+4m/s, where t is in s. How many turning points does the particle reach
Two ships are moving along a line due east. The trailing vessel has a speed of 62.0 km/h relative to a land-based observation point, What frequency is monitored by the leading ship
A pulley with a radius of 10.0 cm is mounted on an axle that passes through the center of the pulley. calculate the number of revolutions the pulley has made
An industrial flywheel with a moment of inertia of 4.60 × 102 kg•m2 rotates with a speed of 8000 rpm. Find how much work is required to bring flywheel to rest
What is the potential 0.530×10–10 m from a proton (the average distance between the electron and proton in a hydrogen atom)?
An airplane is flying in a horizontal circle at a speed of 100 m/s. The 80.0-kg pilot does not want her radial acceleration to exceed 7g. (a) What is the least radius of the circular path? (b) At this radius, what is the force causing the centripe..
Suppose a 65 kg person stands at the edge of a 6.5 m diameter merry-go-round turntable that is mounted on frictionless bearings and has a moment of inertia of 1850 kg m2. Calculate the angular velocity of the turntable
a hot air balloon is ascending straight up at a constant speed of 7.0 ms. when the ballon is 12.0 m above the ground a
Mars has a net electric flux = 3.63 X 1016 at the planet’s surface. Compute the total electric charge on the planet and the charge density.
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