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January 29, 2015

January 29, 2015

Posted by **Celina** on Wednesday, November 5, 2008 at 4:41pm.

#1: A space craft travels at a speed of 8/10 of a mile per second. How many days does it take it to travel from the Earth to the Moon, a distance of 240,000 miles?

At first, my answer I got was 208 1/3 days, but to me that sounds way to long for a spacecraft, considering how fast it is going. The other possible answers I got are that maybe I need to move the decimal point, so maybe 20.8 days or 2.08 days. Please tell me if any of these answers are right.

#2: How much force, in g•cm/s² (that's to the second power, if you can't read that symbol) is exerted by a golf ball striking a tree while accelerating at 20 cm/s²? Show how you can solve this problem without knowing that F = ma.

Of course, I don't even know what in the world F = ma is. Okay, my sister told me it means Force equals mass times acceleration, but I wouldn't even know how to apply it to this problem.

Try to solve this problem. It did say in the problem a golf ball like the one in problem #9 on my worksheet, so if you need more info to solve this problem, I can give you problem #9, too.

I appreciate any help you can give me. Thank you!

- Algebra -
**bobpursley**, Wednesday, November 5, 2008 at 5:11pm#1: A space craft travels at a speed of 8/10 of a mile per second. How many days does it take it to travel from the Earth to the Moon, a distance of 240,000 miles?

so how many seconds are in a day?

60sec/min*60min/hr*24hrs/day=86400sec/day

So how fast is it going?

8/10 mi/sec*86400sec/day=? mi/day

So how long does it take?

timeindays=distanceinmiles/speedinMi/day

- Algebra -
**Celina**, Wednesday, November 5, 2008 at 6:59pmThanks! Could you explain how you got your answer a little more and give me the numbers, too? Do you have any idea for the answer to number 2? Thanks so much!

- Algebra -

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