If you dropped a ball from any height, and measured its distance from the ground at any regular interval while it's falling, the graph of that distance versus time would be a graph that curves downward.
-- The ball is falling down. As time goes on, it gets closer and closer to the ground. Its remaining distance from the ground keeps decreasing, so the line on the graph slopes down.
-- The speed of the ball keeps increasing (it accelerates) because of the gravitational force on it. As time goes on, it covers more of the remaining distance during each interval than it did in the previous interval. The downward slope of the graph keeps increasing.
The earth is considered an Open system which is B.
Answer:
Explanation:
Given
Lawn mover running for 
and does 
We know Power is rate of work i.e.
Thus Power output is
Answer:
Explanation:
N = Near point of eye = 25 cm
= Focal length of objective = 0.8 cm
= Focal length of eyepiece = 1.8 cm
l = Distance between the lenses = 16 cm
Object distance is given by
= Object distance for objective
From lens equation we have
The position of the object is .
Magnification of eyepiece is
Magnification of objective is
Total magnification is given by
The total magnification is .
