Hot water of mass 10 kg at 90°C is cooled for taking bath by mixing 20 kg of water at 20 °C, what is the final temperature of the water? (Specific heat capacity of water is 420J/kg )

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

Determine the change in width a, height b, thickness t when a plate is subjected to the uniform distributed load and is made of material having modulus of elasticity e=230 gpa and poisson's ratio ν=1/3. given : a=400 mm and b= 300 mm also the uniformly distributed load in downward y direction of plate is 2 mn/m and in the positive x direction is 3 mn/m and t=20 mm

If a balloon is taken outside on a very cold day, what will occur?