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anonymous
 one year ago
Radio signals travel at a rate of 3*10^8 meters per second. How many seconds will it take for a radio signal to travel from a satellite to the surface of the Earth if the satellite is orbiting at a height of 7.5*10^6 meters?
A) 6 seconds
B) 2.5*10^2 seconds
3) 4.0*10^3 seconds
D) 2.5*10^2 seconds
anonymous
 one year ago
Radio signals travel at a rate of 3*10^8 meters per second. How many seconds will it take for a radio signal to travel from a satellite to the surface of the Earth if the satellite is orbiting at a height of 7.5*10^6 meters? A) 6 seconds B) 2.5*10^2 seconds 3) 4.0*10^3 seconds D) 2.5*10^2 seconds

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JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1distance=rate*time

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so we solve for rate first? @JoannaBlackwelder

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1We are given rate. We are looking for time. So, solve for time.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Can u help me with that please @JoannaBlackwelder

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1dw:1439920734718:dw To solve for time, we need to get it by itself.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1dw:1439920766408:dw r is currently multiplied by t, so we divide by it to get rid of it on that side. And what we do to one side of an equation, we have to do to the other side.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1dw:1439920841491:dw

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Does that make sense so far?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0kinda, I get confused with letters in math @JoannaBlackwelder

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Ok, yeah, they can be kinda tricky. Let me show you another way that doesn't use letters.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Start with the distance the signal travels:dw:1439921098416:dw

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1dw:1439921144658:dw And since the signals travel 3x10^8 meters in 1 second, we can use that ratio as a conversion factor.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Since for the signals 1 second equals 3x10^8 meters of travel

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1And multiplying by a fraction of two things that are equal is just multiplying by 1, which doesn't change the value.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1dw:1439921324634:dw The units of m cancel since one is in the numerator and the other is in the denominator.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1And we are left with a number of seconds. :) Does that method make more sense?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0It does make more sense.. @JoannaBlackwelder
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