I need to finish these by midnight tonight, any help on any of these is extremely appreciated and I will donate for good help! Oh, and if you dont want to type all the work you can just put the answer if youre positive, just be sure to make sure it is correctly to at least 3 decimals as i have to submit it online-- and if it is not to the correct 3 decimals, it's wrong.

4.) On June 14, 2005, Asafa Powell of Jamaica set a world's record for the 100-m dash with a time t = 9.77 s. Assuming he reached his maximum speed in 3 s, and then maintained that speed until the finish, estimate his acceleration during the first 3 s.


5.) Cosmonaut Andrei, your co-worker at the International Space Station, tosses a banana at you at a speed of 14 m/s. At exactly the same instant, you fling a scoop of ice cream at Andrei along exactly the same path. The collision between banana and ice cream produces a banana split 8.5 m from your location 1.3 s after the banana and ice cream were launched.

(a) How fast did you toss the ice cream?
??? m/s

(b) How far were you from Andrei when you tossed the ice cream?
?? m

6.)A bolt comes loose from underneath an elevator that is moving upward at a speed of 4.7 m/s. The bolt reaches the bottom of the elevator shaft in 2.4 s.
(a) How high up was the elevator when the bolt came loose?
m

(b) What is the speed of the bolt when it hits the bottom of the shaft?
m/s

7.) A sled at rest is suddenly pulled in three horizontal directions at the same time, but it does not move. Paul pulls to the northeast with a force of 32 lb. Johnny pulls at an angle of 36° south of due west with a force of 58 lb. Connie pulls with a force to be dertermined.
(a) Express the boys' two forces in terms of the usual unit vectors.
Paul: ? lb ihatbold + ? lb jhatbold
Johnny: ? lb ihatbold + ? lb jhatbold


(b) Determine the third force (from Connie), expressing it first in component form and then as a magnitude and direction (angle). Neglect friction.
FConnie: lb ihatbold + lb jhatbold

Magnitude: ? lb
Direction: ?° North of East

Really cutting it down to the wire on your timing, eh? I'll see what I can do, but it's a bit of a rush job. I'll post what I have at 11:45 (45 minutes from now) so you have time to check back and submit it all.

7 answers with no solutions, so I'd request 35 fg for that. At least a 50% discount from my usual rate (10+ with full solutions depending on difficulty)
4) 12.092 m/s
5a) 6.538 m/s
5b) 26.700 m (if this doesn't work, use 26.699 m gotten from using 6.538 m/s instead of the exact answer in a)
6a) 16.944 m
6b) 18.820 m/s (it's speed is downward, but since it says speed, direction is unimportant. If it said velocity instead, it would be -18.820 m/s)
7a) Paul = 22.627 i-hat + 22.627 j-hat. Johnny = -46.923 i-hat + -34.092 j-hat
7b) Connie = 24.296 i-hat + 11.465 j-hat = 26.865 pounds @ 64.738 degrees north of east.

This post was edited by bentherdonethat on Jan 18 2011 10:48pm