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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.
A cylindrical fishing reel has a moment of inertia of I = 6.61E-4 kg*m2 and a radius of 3.98 cm. A friction clutch in the reel exerts a restraining torque of 1.47 N*m if a fish pulls on the line. What is the force of the fish on the line
A step-down transformer is used for recharging the batteries of portable devices. The turns ratio N2/N1 for a particular transformer used in a CD player is 9:42. find the rms output voltage of the transformer
A small round solid object beta equals 3/4 of mass m and radius r is released from rest at height h on a circular loop track of radius R. The objects rolls without slipping and the radius of the object is much less
The suspension system of a 1700 kilogram automobile "sags" 11 centimeter when the chassis is placed on it. Compute the values of the damping constant for the spring
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 126-kg laser sensor which measures the thickness of the ice, find the tension in the cable towing the sensor
You create a diffrent kind of pendulum by swinging a meter stick (mass m) on its end. It swings with small oscillations. Determine the angular frequency w ( I=1/3 ML ^2)
A 2.40 MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as the heart beats.
A block of mass M = 7.166 kg is pulled along ahorizontal frictionless surface by a rope of mass m =0.470 kg, as shown in Fig. 5-62. A horizontal force = 36.7 N is applied to one end of the rope. Assume that the rope only sags a negligible amount
If the charge of the point charge in the figure were -6Q (instead of +Q), by what factor would the magnitude of the force on the point charge due to the dipole change?
In an electron microscope, there is an electron gun that contains two charged metallic plates 2.65 cm apart. Determine the time interval the electron spends between the plates
Two electrons are fixed 2.1 cm apart. Another electron is shot from infinity and comes to rest midway between the two. What was its initial speed
in us football after a touchdown the team has the opportunity to earn a point by kicking the ball over a bar between
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