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the mean fee path of air molecules at 0 C and 1 ATM is about 2*10^-5 cm.
a) what is the effective molecular diameter of an air molecule?
b) at what pressure (at 0 C) would the mean fee path be equal to the effective molecular diameter?
A certain laser emits light in a narrow band of wavelengths centered at 632.7 nm and with a ''wavelength width'', What is the corresponding ''frequency width'' in hertz for the emission
A projectile is launched perpendicularly upward from a planet of mass M; and radius R; its initial speed is twice the escape speed. Derive an expression for its speed as a function of the distance from the center of the planet.
Four wires meet at a junction. In two of the wires currents I1 = 1.55 A and I2 = 2.15 A enter the junction. Find the current in the fourth wire and indicate its direction
A 99 kg man lying on a surface of negligible friction shoves a 71 g stone away from himself, giving it a speed of 4.0 m/s. What speed does the man need as a result.
A man is to pull a 50 .0 kg crate across a level terrain with a force of 50.0 N. What is the coefficient of kinetic friction, if the work done by friction is - 4.30 x 102 J
A piece of balsa wood with density 0.50g/cm^3 is released under water. What is the initial acceleration?? Repeat for a piece of maple with density 0.760 g/cm^3? Repeat for a ping-pong ball with the average density of 0.127 g/cm^3.
Two point charges q1= 2.0x10^-6 C and q2= -3.0x10^-6 C, Find the electric field and the electric potential at a point on the x-axis
A string is clamped at one end and the other end rests on a light, frictionless pulley with a mass hanging below it to provide a tension. What is the mass on the end of the string
an electron in an x-ray machine is accelerated through a potential difference of 1.00 X 10^4 V, What is the kinetic energy of the electron
In a student experiment, a constant-volume gas thermometer is calibrated in liquid nitrogen (?196°C) and in boiling allyl alcohol (97°C). What value of absolute zero does the calibration yield
A rechargeable battery that is completely drained of electrical energy can be completely charged by applying 6.0 mA of current for 1.0 h. how much energy is the battery capable of storing
A rotating cylinder about 25 km long and 9 km in diameter is designed to be used as a space colony. with what angular speed must it rotate so that residents on it would experience the same acceleration due to gravity as on earth? In radians per se..
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