Home
Class 12
PHYSICS
consider a drop of rain water having mas...

consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 5 `m//s`.Take g constat with a vlaue of 10 `m//s^(2)`. The work donw by the (i) gravitational froce and the (ii) resistive force of air is

A

(i) -10 J (ii) -8.25

B

(i) 1.25 J (ii) -8.25

C

(i) 100 (ii) J 8.75 J

D

(i) 10 J (ii) -8.75 J

Text Solution

Verified by Experts

The correct Answer is:
D
`w_(g)+w_(a)=K_(f)-K_(i)`
`mgh+w_(a) =(1)/(2)mv^(2)-0`
`10^(-3) xx 10xx10^(3)+w_(a)=(1)/(2)xx 10^(-3) xx (50)^(2)`
`w_(a)=-8.75 J` i.e. work done due to air resistance and work done due to gravity =10 J
Promotional Banner

Similar Questions

Explore conceptually related problems

Consider a drop of rain water having mass 1 g falling from a height of 1 km . It hits the ground with a speed of 50 m//s Take g constant with a volume 10 m//s^(2) . The work done by the (i) gravitational force and the (ii) resistive force of air is :

Consider a drop of rain water having mass 1 g falling from a height of 1 km . It hits the ground with a speed of 50 m//s Take g constant with a volume 10 m//s^(2) . The work done by the (i) gravitational force and the (ii) resistive force of air is :

A stone of mass 20 g falling from height of 2 km hits the ground with a speed of 200 ms^-1 . The work done by the gravitational force is

It is well known that a rain drop falls under the influence of the downward gravitational force and the opposing resistive force. The latter is known to be proportional to the speed of the drop, but is otherwise undetermined. Consider a drop of mass 1.0g falling from a height of 1.00km. It hits the ground with a speed of 50.0ms^(-1) (a) What is the work done by the gravitational force ? (b) What is the work done by the unknown resistive force ?

A raindrop of mass 2g falling from a height of 1.00 km, hits the ground with a speed of 40.0 ms^(-1). (a) Find the work done by the gravitational force. (b) Find the work done by t he opposing resistive force (g=10ms^(-2))

A drop of mass 2.0 g falls from a cliff of height 1.0 km It hits the ground with a speed of 50.0 ms^(-1). The work done by the resistive force is

A raindrop of mass 2g falling from a height of 1.00 km, hits the ground with a speed of 40.0 ms^(-1). (a) Find the work done by the grativational force. (b) Find the work done by the opposing resistive force (g=10ms^(-2))

A raindrop of mass 1.00 g is falling from a height of 1.00 km. It hits the ground with a speed of 50.0 ms^(-1) Find the work done by the unknown resistive force (g = 10 ms^(2)).

A raindrop of mass 1g falling from a height of 1km hits is the ground with a speed of 50 ms^(-1) . Which of the following statements is correct? ("Taking" g= 10ms^(-2)) .

A raindrop of mass 1g falling from a height of 1km hits is the ground with a speed of 50 ms^(-1) . Which of the following statements is correct? ("Taking" g= 10ms^(-2)) .