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Alternative current flows by infinitely long solenoid. Magnetic field inside of solenoid is defined by the formula H=(4π/c)*i, where i – current, which falls within the unit of length of solenoid. If on solenoid put a wiry coil then the magnetic stream through it will change and in the coil will appear induction stream. The magnetic field in the place of the coil is equal to zero and the reasons for emergence of induction stream are not noticed. Explain the paradox.
Heat-insulated vessel with ideal gas is hanged on a rope in the gravity field. Due to the influence of force of gravity the density of gas in the bottom of the vessel is bigger than in the top. The rope is burned and the vessel freely falls. Supposedly, during the falling has time for forming of thermodynamic equilibrium, define equilibrium gas temperature, which will form in it in time of falling.
What are the forumulas to calculate the index number?
What is correlation?
Define order of magnitude of maximum speed, with which artillery projectile fly out of a barrel. What requirements should be followed in order the speed was lead to maximum?
In Carno cycle instead of refrigerator was chosen water with 4°C. As thermal expansion coefficient with such temperature is equal to zero, for Carno cycle to happen the temperature should not be shown on the refrigerator, that is, thermal expansion coefficient is equal to one. Where is the mistake?
Under which polytropic exponent the ideal gas heats and under which is cools?
Show, that near absolute zero surface tension of liquid does not depend on temperature, that is lim(dσ/dT) (T→0). Specifically it refers to helium - the only substance which stays liquid under absolute zero temperature.
With the help of condensing lens one can light up a cigarette, focusing straight sun light on it. Is it possible to do the same, having an appropriate lens (for example, objective of a huge astronomical telescope), with the help of full Moon light?
Will the resolving force and dispersion area of grating diffraction change, fixing motionless a tube, into which are observed diffraction spectrum, close next nearest slits of grating?
