Question

A plane is revolving around the earth with a speed of 100km/hr at a constant height from the surface of earth.the change in the velocity as it travels half circle is

Answer 1

hi dude,

Let's say the initial velocity of the plane is 100km/h in the upward direction (in the 2-D plane of this digital screen).

After the plane completes half a circle, it will be pointing downwards. But it will still have the same speed of 100km/h. You can also call this −100km/h in the upward direction.

So, the change in velocity is equal to the initial velocity subtracted from the final velocity.

Change in velocity = −100km/h−100km/h in the upward direction.

Change in velocity = −200km/h in the upward direction.

If you want to talk in terms of some coordinate axes, let's consider the initial velocity to be (100i^+0j^+0k^)km/h, where i^,j^,k^ are the unit vectors in x,y,z directions. In this case, the upward direction will be the positive-x direction.

Then the final velocity will be (−100i^+0j^+0k^)km/h.

Hence,

Change in velocity = (−100i^+0j^+0k^)−(100i^+0j^+0k^)km/h

Change in velocity = (−200i^+0j^+0k^)km/h

thanks...

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Answer 2

as it complete half of its revolution. .

direction of velocity reversed. ...
so, change in velocity is

V final -V initial

=-100-100
=-200/ hr....
hope it Will help you. ...