Exponents - check answer please

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lrivetz

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Jun 2, 2006
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4
(1/3) neg 4 = 1/81

(1/2) neg 2 = 1/4

If the speed of light is 3.00 x 10 ^ 8 m/sec, how long does it take light to travel 2.29 x 10 ^ 11 m, the distance from the sun to the Mars? = 6.87 x 10 ^ 19 m/sec

Thank you.
 
lrivetz said:
If the speed of light is 3.00 x 10 ^ 8 m/sec, how long does it take light to travel 2.29 x 10 ^ 11 m, the distance from the sun to the Mars? = 6.87 x 10 ^ 19 m/sec
Click to expand...
There's a hint in the problem statement. "How long...?" You should end with a TIME.

(2.29 * 10^11 m)/(3.00 x 10 ^ 8 m/sec) = ?? seconds
 
tkhunny said:
lrivetz said:
If the speed of light is 3.00 x 10 ^ 8 m/sec, how long does it take light to travel 2.29 x 10 ^ 11 m, the distance from the sun to the Mars? = 6.87 x 10 ^ 19 m/sec
Click to expand...
There's a hint in the problem statement. "How long...?" You should end with a TIME.

(2.29 * 10^11 m)/(3.00 x 10 ^ 8 m/sec) = ?? seconds
Click to expand...

7.63 x 10 ^ 2

The answer has to be in scientific notation.
 
Good start.

I think you have the arithmetic, but you seem to have lost your units.
 
tkhunny said:
Good start.

I think you have the arithmetic, but you seem to have lost your units.
Click to expand...

7.63 x 10 ^ 2 m/sec

how about these:


(1/3) neg 4 = 1/81

(1/2) neg 2 = 1/4
 
lrivetz said:
(1/3) neg 4 = 1/81

(1/2) neg 2 = 1/4
Click to expand...
Post those like THIS: (1/3)^(-4) ; (that's 1/3 to the power minus 4)

You're close: answers should be 81 and 4; I'll let you figure out why 8-)
 
lrivetz said:
7.63 x 10 ^ 2 m/sec
Click to expand...
Still no.

Think for a moment, BEFORE you do any arithemetic, "What SHOULD the units be in the final result?"
 
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