Molecular Physics | Thermodynamics Answers

An electron and a positron are moving side by side in the +x direction at 0.500c when they annihilate each other . Two photons are produced that moves along the x axis (a) Do both photons move in the +x direction ? (b) What is the energy of each photon

Assuming a velocity distribution which is a

parabola having its vertex 12 in from the boundary,

calculate the shear stress at y= 0, 3, 6, 9 and 12 inches.

Fluid’s absolute viscosity is 600 P

What do you understand by intensive and extensive variables of a system? state with reasons which of following variables are intensive and which are extensive ? (i) Number of gas molecules enclosed in a box (ii) density of a gas in a box (iii) wavelength of radiation emitted by a black body at temperature T(iv) intensity of radiation emitted by a black body at temperature T

Define viscosity discuss the effect of temperature and pressure on viscosity a

Water enters the heater at 30oC and leaves at 150oF, what is the temperature difference in oC?

     Two objects made of the same material have the same external dimensions and appearance, but one is solid and the other is hollow. When their temperature is increased, is the overall volume expansion the same or different? Why?

 Suppose that you cut a small gap in a metal ring. If you were to heat the ring, discuss whether the gap would become wider or narrower.

   Which generally expands more for an equal increase in temperature: solids or liquids? Explain.

  Freezing a can of soda will cause its bottom and top to bulge so badly the can will not stand up. What has happened?

  A brass telephone wire has essentially no sag between poles 35.0 m apart on a cold day when the temperature is -20.0°C. How much longer is the wire on a summer day when the temperature is 35.0°C? If we change the kind of wire copper, how much longer is it during summer? Which is longer?