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Thai Thai
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Posts: 3
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10 years ago
I need help on MasteringPhyisics Homework, Ch.3.
I need help with homework 3.13 and 3.28
Please, help.
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wrote...
#1
Donated
Valued Member
10 years ago
Post the questions for those of us not privy to the book.  We maybe could help.
Pretty fly for a SciGuy
wrote...
#2
10 years ago
hi,
i've worked out 3.13. here's problem 3.28:

-An athlete performing a long jump leaves the ground at a 32.9∘ angle and lands 7.68m away.
1/What was the takeoff speed?
2/If this speed were increased by just 3.0%, how much longer would the jump be?

I've try different formula but I couldnt get it to work. Maybe it involves manipulating the formulas and numbers but I'm not sure how to approach it correctly.
wrote...
#3
Donated
Valued Member
10 years ago
Part 1 attached.  Try to work out part 2 with what I've given you; if you can't, I'll help you, but I think it will help you to be able to do the second part, now having seen this example.
Post Merge: 10 years ago

Fairly difficult question, btw.
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Pretty fly for a SciGuy
Thai Author
wrote...
#4
10 years ago
Thank you!
Although I sorted out with my professor and it was my miscalculation while using the equation:

Displacement(y) = tan(theta)*displacement(x) - [g/(2* initial v square * cos(theta) square)]*displacement(x) sq

The answer is 9.08 and it's correct. But then i try the part B using original formula to solve for displacement(x) but it was wrong. Please help. Thanks, again!

Thai
hannah119
wrote...
#5
Donated
Valued Member
10 years ago
Since I got it wrong, I don't think it's a good idea for me to continue lol
Pretty fly for a SciGuy
Thai Author
wrote...
#6
10 years ago
Thanks for trying!
I'll try to figure it out or something haha
wrote...
#7
Donated
Valued Member
10 years ago
I forgot I had already done the second part, so I'll upload it an you can do what you will with it.
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Pretty fly for a SciGuy
wrote...
#8
3 years ago
Thank you so much
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