When an object of height 4cm is placed at 40cm from a mirror the mirror forms the image on the object itself. If the height of the image is equal to the height of the object. Find out the focal length of the mirror and identify the mirror. A convergent beam of light passes through…… Continue reading Numerical Problems From Optics

# Tag: height

## Height of Antenna and range of transmission

A TV Tower has a height h. Derive expression for the maximum distance upto which signals can be received on earth.

## A body is dropped from a tower of height 96 m. Another body is thrown up from the ground after a second with a velocity of 40 m/s.When and where they will meet?

A body is dropped from a tower of height 96 m. Another body is thrown up from the ground after a second with a velocity of 40 m/s. When and where they will meet?

SOUNDARYA asked

Answer:

For the first body,

u=0 m/s

Let S=x (from top)

x=0.5 gt2 &#…

## The problem of a rock thrown vertically up

A rock is thrown vertically upward from the ground with an initial speed 15m/s.

a. how high does it go b. how much time is required for the rock to reach its maximum height? c. what is the rock’s height at t=2.00s?

(Posted by Merhawi)

Answer:

(a)

u=15m/s

a=-10m/s2

v=0 m/s […]

## The problem of a rock thrown vertically up

A rock is thrown vertically upward from the ground with an initial speed 15m/s. a. how high does it go b. how much time is required for the rock to reach its maximum height? c. what is the rock’s height at t=2.00s? (Posted by Merhawi) Answer: (a) u=1…

## The problem of a rock thrown vertically up

A rock is thrown vertically upward from the ground with an initial speed 15m/s. a. how high does it go b. how much time is required for the rock to reach its maximum height? c. what is the rock’s height at t=2.00s? (Posted by Merhawi) Answer: (a) u=1…

## A question from Kinematics.

An object thrown vertically up from the ground passes the height 5m twice in an interval of 10s. What is its time of flight? (Divya asked) Answer: The question seems partial. I am assuming that g= 10 m/s2 and the projection is strictly vertical. The o…