How long does it take a glass of salt water to freeze than a glass of fresh water

Aman tries to push a box of mass 4 kg with a force of 5 n but the box remains stationary if the coefficient of static friction is 0.45, what is the value of the maximum force of friction?

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.