Temperature of the unierse in the earlist moments after the big bang is _________.

A metal block of heat capacity 90J//.^(@)C placed in a room at 25^(@)C is heated electrically. The heater is switched off when the temperature reaches 35^(@)C . The temperature of the block rises at the rate of 2^(@)C//s just after the heater is switched on and falls at the rate of 0.2^(@)C//s just after the heater is switched off. Assume Newton's law of cooling to hold (a) Find the power of the heater. (b) Find the power radiated by the block just after the heater is switched off. (c ) Find the power radiated by the block when the temperature of the block is 30^(@)C . (d) Assuming that the power radiated at 30^(@)C respresents the average value in the heating process, find the time for which the heater was kept on.

The universe originated _____years ago,according to the big bang.

If the temperature of a uniform rod is slighely increased by Deltat its moment of inertia I about perpendicular bisector increases by

The big Bang theory explains the ______

If the temperature of a uniform rod is slightly increased by Deltat , its moment of inertia I about a line parallel to itself will increased by

Show that moment of inertia of a solid body of any shape changes with temperature as I=I_0(1+2 alphatheta). Where I_0 is the moment of inertia at 0^@C and alpha is the coefficient of linear expansion of the solid.

Water at temperature 100^(@)C cools in 10 minutes to 80^(@)C in a room temperature of 25^(@)C . Find (i) The temperature of water after 20 minutes (ii) The time when the temperature is 40^(@)C ["log"_(e)11/15=-0.3101,log_(e)5=1.6094]

An oxygen cylinder of volume 30 liters has an initial gauge pressure of 15 atm and a temperature of 27°C. After some oxygen is withdrawn from the cylinder, the gauge pressure drops to 11 atm and its temperature drop to 17°C. Estimate the mass of oxygen taken out of the cylinder. (R = 8.31 J mol-1 K_1, molecular mass of O2 = 32 u).