Question

i doubt anyone is awake right now, but i'm taking a physics exam and i have no idea what to do on some of these problems because, i guess by dumb luck, i scored out of them. for example:


A vector that travels at 12.0 m/s in the positive y direction is added to a vector that travels at 2.00 m/s in the positive x direction. What is the resulting vector?

A. 12.2 m/s; 80.5 degrees above the horizontal
B. 13.1 m/s; 75.6 degrees above the horizontal
C. 13.8 m/s; 74.1 degrees above the horizontal
D. 14.3 m/s; 72.9 degrees above the horizontal


i don't remember ever learning this

Answer 1

if you dont want to give me the answer, please at least tell me the formula. i keep googling and trying to find it but there's nothing

Answer 2

http://www.physicsclassroom.com/class/vectors/Lesson-1/Vectors-and-Direction
This website might be able to help you understand what a vector is and how to solve it

Answer 3

thank you!

Answer 4

your welcome. If you have anymore questions I can try to help you.

Answer 5

How far apart must two 1250-kg masses be placed for the gravitational force between them to be 1.00*10^-5N?

A. 3.22 m
B. 6.67 m
C. 10.4 m
D. 18.9 m

i know that the formula i need to rearrange for this is Fg = G Mm/d^2, but i'm not sure how to change it into what i need. :/

Answer 6

This might take me a minute to solve

Answer 7

thank you :) ♥

Answer 8

your welcome

Answer 9

omg this problem is so hard. Every time I try to solve it I never get the right answer.

Answer 10

that's okay! thank you for trying :) i'm not sure how to do it either

Answer 11

your welcome!

Answer 12

You need to solve for d.