Question

Only the mass of the planet and radius of the orbit are needed to calculate the orbital speed of a satellite. True or False

Answer 1

What do you think!?

Answer 2

From what i've looked up, i'm not getting much of a decent answer. I'm leaning more towards false.

Answer 3

do you think.. instead of moon, a tiny rock was orbitting our earth at the same radius .. it would have the SAME SPEED? :O :O :O :O

Answer 4

do you know what is the expression for orbital speed?

Answer 5

No, but i can look it up. unlesss you're going to put it on here XD

Answer 6

Let, m = Mass of satellite. r = radius of circular orbit of satellite. h = height of satellite above surface of earth.

Answer 7

you think i m going to do that? xD.. do you really think so.. ?:P

quick boy.. i have a short window

Answer 8

Is that correct?

Answer 9

what is the expression?

Answer 10

I've found it but icannot copy paste it in the text it is in.

Answer 11

hmm alright..

the expression is

\[v = \sqrt{rg}\]
where r is the distance of the satelite or whatever from the centre of the planet
and g is the gravitational acceleration AT that point due to that planet!

Answer 12

@therealjuicyj u there bro? :P

Answer 13

Haha yeah sorry im on a time schedule as well. i just went HAM and looked up the expression and a quick short video on how to use it. And i got a 90% on my test. ;) Thanks though!

Answer 14

Medal for trying!

Answer 15

lol
did u get the answer though???.. does it depend on the mass of the satellite or no?

Answer 16

Yes it was True.

Answer 17

and do you understand why?

Answer 18

Yessum!

Answer 19

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0CEAQFjAE&url=http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FOrbital_speed&ei=KWBFU-TBNsS72wW80oHgDg&usg=AFQjCNEQtJbmbusGJEcGOWubLTE6Eeedyg&bvm=bv.64507335,d.b2I

Answer 20

Low key, wikipedia is somewhat useful.

Answer 21

no no.. i know it.. xD
i want to know if you understood it ???
getting answer or looking at expression is not enough. .u should feel it right inside your stomach.. such that u can explain that to your grand children.. (like how i will some day)

so can u physically understand.. why .. why the orbital speed has NOTHING to do with the mass of the object? :O
it seems quite against our intuition right? can u build an intuition for that?

Answer 22

Yeah, honestly. I would love to learn it. But the way i am taking school. I'm not in normal schooling, i am in the alternative school where they give up on you and let you do your own thing. I'm only here to make up my physics credit. It's a sad world for the fallen.

Answer 23

I'm also very forget ful so i have probably learned this years back but. I just can't seem to grasp it.

Answer 24

well.. ll try my best to be breif and informative

if there is small mass, then gravitational force is small, and big mass, then force is big.. HOWEVER.. the acceleration that they would achieve IS EXACTLY THE SAME..

just like how things fall at the same rate (a feather and apple fall same rate on the earth cause they feel same acceleration.. in absence of air that is)

so since they both experience same acceleration, (the centripetal acceleration), their orbital speeds SHOULD BE SAME!!!

Answer 25

Ahhh! I wish these teachers would explain just like that. That wasn't too hard to understand either. :) Thank you Mashy!

Answer 26

no problimo :)