Homework Help (Problem Solving/Physics)

Get_D0wn · Oct 29, 2008

1. You plan a car trip on which you would like to average 66 kilometers per hour. You cover the first third of your distance at an average speed of 40 km/hr. You cover the second third of your distance at an average speed of 72 km/hr. What speed must you average on the third leg of the trip in order to meet your goal?
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2. Given the following trip information which driver will arrive first and by how much time? Sarah leaves home and drives 43miles to work at a constant speed of 80 km/hr. Bill was not so lucky, he had to start and stop numerous times. For the first 5 km he traveled at a constant 80 km/hr. He stopped instantaneously at a stop light and had to wait 2.2 minutes before instantaneously jumping to 90 km/hr for the next 10 km. He then approached another stop light, starting and stopping once again instantaneously. The light lasted 1.5 minutes and his speed after the light was 110 km/hr. He maintained this speed for the next 15 km. He then had to deal with traffic. For the next 6 km his average velocity was only 15 km/hr. He quickly accelerated to 90 km/hr over the next 150 meters and continued at that new speed for the next 30 km. An animal then ran into the road causing Bill to slam on the brakes, causing instantaneous change in his velocity to zero. He then accelerated to 30 km/hr over 200 m and then continued at that speed for the next 2301m. Bill then slowed his car to rest over the next 536 meters, finally arriving at work. Assume both Sarah and Bill drive in a straight line to work.
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THIS ONE I NEED HELP ON **HINT** USE A CHART**

3. Last Saturday, the first five couples to visit Jack O'Lantern's Halloween Shop rented costumes to wear for the night of October 31. Each husband and wife picked a different costume based on a real or fictional person. Given the clues below, will you get tricked or get a treat by finding the first and last names of each couple (one husband is Mark and one wife Erica), the costume each rented for Halloween, and the order 1st-5th in which the couples paid for their selections?
1. All five women and four of the men picked costumes of "appropriate" gender; one of the husbands, however, thought it would be funny to dress as a female character on Halloween.
2. Nick had wanted to go as Elvis Presley or Uncle Sam but found both costumes had been rented to husbands who were in Jack O'Lantern's earlier than he was Saturday.
3. Angela and her husband, who didn't pick the Babe Ruth outfit, picked costumes at the store before the woman who chose Madonna and her spouse did.
4. Mrs. Poe, who isn't the person who rented the Littlest Mermaid costume or the one who chose the Wicked Witch outfit, and her husband picked their costumes immediately ahead of Lou and his wife.
5. In consecutive order first-to-last, Cynthia and her husband, the woman who is going as Catwoman and her husband, and the man dressing as Capt. Hook and his wife rented costumes at Jack O'Lantern's.
6. Nick, who isn't Belinda's husband, and Mr. Hitchcock both decided they were too tall for the Yoda costume, which no one rented on Saturday.
7. Ken and Mr. Chaney and their wives were picking costumes to wear to the Ocean City Marina Floating Halloween Party on October 31.
8. The Kings paid for their rentals, then the couple who had the Old Mother Hubbard and another costume paid for theirs.
9. The man going as Elvis Presley on Halloween, who isn't Cynthia's husband, isn't the one whose wife is going as Barbie.
10. The Hitchcocks were the last of the five couples to choose their costumes.
11. Jim and his wife got their outfits earlier than Mr. & Mrs. Chaney.
12. The wife of the man going as Uncle Sam didn't pick the Old Mother Hubbard costume because she thought it would be too heavy to wear all evening.
13. Belinda and her husband paid for their costumes immediately after the man going as Babe Ruth and his wife paid for theirs and immediately before the woman going as Barbie and her husband rented theirs.
14. Cynthia isn't the woman masquerading as Madonna on Halloween.
15. Nick, whose wife isn't going as Barbie, and Deborah's spouse went to a party last Halloween disguised as George Bush and Al Gore, costumes none of the men selected on Saturday.
16. Belinda, who didn't choose the Catwoman outfit, isn't the woman whose husband is going as Elvis Presley.
17. The Littlest Mermaid costume isn't the one Mrs. Lugosi rented.
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Give them your best shot. I really just need this done so I can compare answers this is my physics class extra credit assignment.

Hopefully this isnt in the wrong forum Nathan your sticky link was dead....so i posted here.

MatthewGor123 · Oct 29, 2008

Why didn't ya post on my thread? I can help ya
When is this assignment due? I should have it by tonight, but I do have a bit more work tonight before I can help.

Get_D0wn · Oct 29, 2008

Its due by Friday.

#1 I got 86 km/hr

#2 I got Sarah arrives first by 20min.

MatthewGor123 · Oct 29, 2008

Oh, I can definitely get it to you by Friday. #3 is tricky, but I'll try my best to get it to you tonight, but my tomorrow afternoon (like 6:00PM) by the latest, unless I can't solve it. I'm making slow and steady progress ATM, not really 100% focused.

MatthewGor123 · Oct 30, 2008

Fuck dude, I'm having a bit of trouble with #3. Can I see how you've set up the problem, like what work you've already done, and then compare it to my logical deductions, and see if you have any information that could help me? I think I'm kind of close. I'm just missing one breakthrough. Mind sending me some work you've done on the problem?

Get_D0wn · Oct 30, 2008

Well for future reference use a spread sheet chart.

Name|______|_______|_______|___________|
____|______|________|_______|_____x______|

Something like that.

MatthewGor123 · Oct 30, 2008

Get_D0wn said: ↑

Well for future reference use a spread sheet chart.

Name|______|_______|_______|___________|
____|______|________|_______|_____x______|

Something like that.
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Yup, that's what I was doing. I understand how to solve logic problems, and I consider myself quite good at them. I was just missing an important breakthrough, one that I am still struggling to make.

Well, congrats on solving the problem

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