I'm taking a geophysics.. tomorrow morning is my exam...pleaseplease I need help in this question!

How far (in km) can you see from a 1000 foot high microwave towerontop of a 14000' summit towards Kansas (assume Kansas is at 1.5km)?

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I'm going through my kaplan MCAT physics book and one of thequestions goes like this. They show a picture of two circles, onelabeled S and one labeled R, with a force vector extending from Sto R. The question asks:

"If an electron were placed midway between R and S the resultantelectric force on the electron would be:"
A) towards R
B) towards S
C) up
D) down

Due to the fact that the force vector was pointing towards R, Ireasoned that the two circles were unlike charges since they wereattracting each other, but it didn't seem to indicate whether R orS was positive or negative.

The answer at the back of the book says the electron will movetowards S because unlike charges attract and repelled by R becauselike charges repel. How did they deduce that S was positive and Rwas negative? Does it have to do with the fact that the forcevector is pointing away from S and towards R? I didn't think itmattered which direction the force vector was pointing.

Please forgive me if this is obvious, but physics is by far myworst subject for MCAT. I would appreciate your help!

A sports car claims that it can start from rest and reach 60 mph(26.8 m/s) in a distance of 33.5 meters. To reach its maximummspeed, it accelerates at this constant rate for 11.25seconds.

a) How many seconds does it take to reach 60 mph?
- I got 1.25 seconds
b) What is the maximum speed of this car?
- Using kinematics I got 120.6 m/s
c) If the mass is 1900 kg, what force must the car provide to keepit traveling at this maximum speed ( Hint: don't forgetfriction)

- I know that Fnet= mass x acceleration, and that gives me 1900 x10.72 = 20,368 N
but this is not taking into account friction. What role doesfriction play and how can I calculate it properly?

d) I was driving this car at a maximum speed on a test track when adeer ran out in front of me. My reaction time was 0.5 seconds,before I hit the brakes. Assuming that the engine is no longerapplying any forward force, and my wheels lock up, how far will Itravel before I come to a stop after seeing the deer (give answerin miles, using: 1 Km = 0.62 miles)?

e) How much time will elapse from the time that I see the deeruntil I stop?