Jaaniye kaise agar 1 pencil aur 1 book ko ek height se fenka jaye to wo same time par Earth pe girengi! :D

The acceleration due to gravity at a height 1km above the earth is the same as at a depth d below the surface of earth. Then :

Assertion : Two bodies of unequal masses m_1 and m_2 are dropped from the same height. If the resistance offered by air to the motion of both bodies is the same, the bodies will reach the earth at the same time. Reason : For equal air resistance, acceleration of fall of masses m_1 and m_2 will be different.

There are two uncharged identicasl metallic spheres 1 and 2 of radius r separated by a distance d(dgtgtr) . A charged metalllic sphere of same radius having charge q is touched with one of the sphere. After some time it is moved away fom the system. Now, the uncharged sphere is earthed. Charge on earthed sphere is

Two bodies are projected at angles 30^(@) and 60^(@) to the horizontal from the ground such that the maximum heights reached by them are equal then a) Their times of flight are equal b) Their horizontal ranges are equal c) The ratio of their initial speeds of projection is sqrt3:1 d) Both take same time to reach the maximum height.

When a Fortins barometer is used to measure the pressure on the surface of the earth and on the top of a building the main scale redaing is found to be the same and the vernier scale reading is found to be 9 and zero, respectively. If one M.S.D. is 1 mm and number of vernier scale divisions is 10, calculate the height of the building. Take the average density of air as 1.3 kg m^(-3) , and that of mercury as 13.6 g cm^(-3)

The acceleration due to gravity at a height 1 km above the earth is the same as at a depth d below the surface of earth

A stone drop from height h reaches to earth surface in 1 sec. if the same stone taken to moon and drop freely then it will reaches from the surface of the moon in the time (the 'g' of moon is 1/6 times of earth)-