Physics Test 18...

A stone falls freely under gravity. It covers distances h₁, h₂ and h₃ in the first 5 seconds, the next 5 seconds and the next 5 seconds respectively. The relation between  is

A water fountain on the ground sprinkles water all around it. If the speed of water coming out of the fountain is v, the total area around the fountain that gets wet is :

A bullet is fired from a gun. The force on the bullet is given by F =  t where, F is in newton and t in second. The force on the bullet becomes zero as soon as it leaves the barrel. What is the average impulse imparted to the bullet?

A body of mass 50kg is projected vertically upwards with velocity of 100 m/sec. After 5 seconds this body breaks into two pieces of 20 kg and 30 kg. If 20 kg piece travels upwards with 150 m/sec, then the velocity of other block will be

Two identical discs of mass m and radius r are arranged as shown in the figure. If  is the angular acceleration of the lower disc and acm is acceleration of centre of mass of the lower disc, then relation between a_cm, and r is

If suddenly the gravitational force of attraction between the earth and a satellite revolving around it becomes zero, then the satellite will

A thick rope of density r and length L is hung from a rigid support. The Young’s modulus of the material of rope is Y. The increase in length of the rope due to its own weight is

Consider an iceberg floating in sea water. The density of sea water is 1.03 g/cc and that of ice is 0.92 g/cc. The fraction of total volume of iceberg above the level of sea water is near by

A student takes 50gm wax (specific heat = 0.6 kcal/kg°C) and heats it till it boils. The graph between temperature and time is as follows. Heat supplied to the wax per minute and boiling point are respectively