It is a common observation that rain clouds can be at about a kilometer altitude above the ground.
Rate of change of momentum is force. Estimate how much force such a drop would exert on you.
(`g = 10 m / s^2` and diameter of drop = 4mm)

It is a common observation that rain clouds can be at about a kilometer altitude above the ground. If the diameter of the rain drop is 4mm then Estimate the time required to flatten the drop.

It is a common observation that rain clouds can be at about a kilometer altitude above the ground. Estimate the order of magnitude force on umbrella. Typical lateral separation between two rain drops is 5 cm. ( g = 10 m / s^2 and diameter of drop = 4mm)

It is a common observation that rain clouds can be at about a kilometer altitude above the ground. If a rain drop falls from such a height freely under gravity, what will be its speed? Also calculate in km/h. (G = 10 m//s^2) .

It is a common observation that rain clouds can be at about a kilometer altitude above the ground. A typical rain drop is about 4 mm diameter. Momentum is mass xx speed in magnitude. Estimate its momentum when it hits the ground.

A rain drop of radius 2 mm falls from a height of 500 nr above the ground. It falls with decreasing acceleration (due to viscous resistance of the air) until at half its original height, it attains its maximum (terminal) speed, and moves with uniform speed thereafter. What is the work done by the gravitational force on the drop in the first and second half of its journey ? What is the work done by the resistive force in the entire journey if its speed on reaching the ground is 10 m s^-1 ?

An oil drop of 12 excess electrons is held stationary under a constant electric field of 2.55 xx 10^4 NC^- 1 in Millikan’s oil drop experiment. The density of the oil is 1.26 g cm^-3 . Estimate the radius of the drop. (g = 9.81 m s^-2, e = 1.60 xx 10^-19 C) .

In Millikan’s oil drop experiment, what is the terminal speed of an uncharged drop of radius 2.0xx 10^5 m and density 1.2xx 10^3 kg m^-3 . Take the viscosity of air at the temperature of the experiment to be 1.8xx 1 0^-5 Pa s. How much is the viscous force on the drop at that speed ? Neglect buoyancy of the drop due to air

A satellite orbits the earth at a height of 400 km above the surface. How much energy must be expended to rocket the satellite out of the earth’s gravitational influence? Mass of the satellite = 200 kg, mass of the earth = 6.0xxl0^24 kg , radius of the earth = 6.4 xx 10^6 m , G = 6.67 xx 10^11 N m^2kg^2 .