# Prokofiev VL - the solution of the entire version 09 on

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PROBLEM 1.9
The material point moves along a circle of radius 1 m according to the equation s = 8t - 0.2t3.
Find the speed, tangential, normal and full acceleration at time 3 s.

At what speed of movement will the relativistic contraction of the length of the moving body be 25%.

A hydrogen molecule moving at a speed of 400 m / s, flies to the wall of the vessel at an angle of 60 ° and elastically hits it. Determine the momentum received by the wall. Take a mass of molecules equal to 3 • 10-27 kg.

Find the momentum, total and kinetic energy of a neutron moving at a speed of 0.6 s.

Up to what temperature it is possible to heat a sealed vessel containing 36 g of water so that it does not burst, if it is known that the walls of the vessel withstand a pressure of 5 • 106 Pa. The volume of the vessel is 5 liters.

The coefficient of internal friction of oxygen under normal conditions is 1.9 • 10-4 kg / m • s. Determine the thermal conductivity of oxygen.