?

I am trying to work out how much force you would need to overcome static friction and everything in this video makes sense and works for this scenario

http://www.youtube.com/watch?v=ZA_D4O6l1lo

but what if the force being applied is 0?

0 - 29.4 = -29.4

-29.4 / 5 = -5.88

so if force is 0 then acceleration is -5.88. The object is not going to start moving in the opposite direction if no force is being applied.

How can I work this out if force is like 0, 1, 5, 10 or something?

If I have a right angle triangle, lets take this triangle for example

http://www.bbc.co.uk/bitesize/ks3/maths/images/rig...

lets say b = 6 and c = 10, therefore a = 11.66. Now I know the size of all three sides and I want to find out the angle of B. How do you find out if you need to use SOH, CAH or TOA to calculate the angle? I can choose any one of these and its going to give me pretty much the same answer but why choose one over the other?

I am trying to make a car simulation game and I need to make the car rotate using torque and angular velocity.

I have been googling around and there is all sorts of information and different formulas and Im get more confused with everything I read.

where does the angular velocity come from? is it measured in angles, degrees, radians or is it just a number and will be incremented and decremented by pressing the arrow keys in the keyboard? I understand that torque is perpendicular to the point where force is being applied from but what sort of values will it give me like how is it measured.

I know my question is confusing but I am just as confused. can someone please answer me or give me a starting point

thanks

I am working on a car simulation game and I dont understand how I would work out the speed.

Force is being generated by the engine. lets say maximum force is 3000 newtons and the car weights 1000 kg.

acceleration = force/mass, maximum acceleration will be 3.

acceleration += speed? <-- programming lingo which means 0+3 = 3, 3+3 = 6, 6+3 = 9, 9 + 3 = 12 etc

is this how I would work out the speed/velocity?

I dont want it to speed up to infinity, is there a formula to work out how fast the car can go depending on the mass and acceleration or do I have manual clamp it?

I need to simulate the following in Euler and 4th order runga kutta method

dy/dt = 5y - 3

y(0) = 0.8

time step h = 0.1 starting from time t = 0 to t = 1.

You need to provide comparison of the result of each numerical integration technique with the exact solution as given with the formula below:

y = 1/5 exp(5t)+3/5

I have been trying to solve this for the past 3 hours and i dont unerstant what is going on since different sites use different letters to represent the variables and its just so confusing. Can someone please explain how I can solve these

private void StartAuction()

{

DateTime closeDate;

closeDate = DateTime.Parse(Console.ReadLine());

}

I am able to set the date,month and year but I want the hours,minutes and seconds to setup automatically to the current time of the day. for example if the current time is 15:24, I want the user to add the date which could be 21/03/2013 and then I want the time to be 15:24:00 and not 00:00:00 as it currently does.

Any suggestions?

public double ReservePrice

{

get { return reservePrice; }

set

{

reservePrice = value;

if (reservePrice > 0 || reservePrice <= itemPrice)

{

throw new Exception("Reserve price has to be more than start price");

}

}

}

If I set the reserve price to 0 it shows the error. If the user types in 0 then I want the reserve price to be 0 but if its more than 0 but less than the item price then I want it to show the error but it doesnt seem to be working =/ any help please

Im making a console app and here is an example.

int option;

switch (option)

case 1:

Console.WritelLine("blah blah");

default:

Console.WriteLine("YOLO SWAG");

If you type in a letter instead if a number, instead of the program crashing, I want to be able to show an error message;

How can I check and show an error if the user types in a letter instead of a number?

Thanks

How do you use exceptions in C#?

for example

public double StartPrice

{

get { return startPrice; }

set

{

if (value >= 0)

{

startPrice = value;

}

else throw Exception;

}

}

this function is another class, setting of the price will be done from the main class. instead of using the console to writeline to show the error I want to throw and exception but Im not usre how to use it.

console.witeline("Title" + " " + "Description")

foreach(Book book in Book.books)

{

console.writeline(books.title + books.description);

}

Title and description are 20 spaces away, I can put this in the for loop because all the books have deferent title length so the description will appear in different places. How can I do this so the description appears right under the description title?

In UML when you design a class structure, you have to write which class can access another class. For example

http://img705.imageshack.us/img705/7808/14408108.j...

Like the system class will have 1 or more users. The seller class can create 0 or more auctions. The auction has 0 or more Bids.

I dont understand. How can the Buyer class access the bid class, why is Bid class related to Auction?

x = t - 1

y = t^2 - 2t - 3

t = x + 1

y = (x+1)^2 - 2(x+1) - 3

(x+1)(x+1) - 2x+2 - 3

x^2 + 1x + 1x + 1 - 2x + 2 - 3

x^2 = x - 2

I dont know what I am doing =/

a = [-1, 1, 1]

b = [3, -2, 2]

Dot Product is -3

Modulus of A is 3

Modulus of B is 17.

3 * 17 = 51

sqrt of 51 = 7.141

1 / 7.141 = 0.140 * - 3 = -2.860

I dont know where to go from here. Usually I get a number like 0.xxxxxxxx and I find the cos θ of that number but its not working with a negative number like this one.

I dont know how to find the angel of a negative number

Can someone help me out with how they did this

cos θ = 8 / [(29)1/2 * (14)1/2] = 0.397

its from this page

http://chemistry.about.com/od/workedchemistryprobl...

A worm sitting at (2, 13) fires a bazooka along the quadratic Y = - X^2 + 10X - 3 at the line Y = 5X + 3. Enter the coordinates where the beam hits.

0 = -X^2 + 10X - 3 - 5X - 3

X^2 = 5X

X^2 - 5X = 0

I dont understand what to do next.

x = t - 1

y = t(Squared) - 2t - 3

t = x + 1

y = (x+1)(squared) - 2(x+1) - 3

(x+1)(x+1) -2x + 2 - 3

x(squared)+1x +1x + 1 - 2x +2 - 3

x(squ) - 2x + 2

Is this right?

int main()

{

short difficulty;

cout << "enter difficulty";

cin >> difficulty;

//the difficulty has to be 1,2 or 3, how do I check if you type in 1,2 or 3? anything besides 1,2 or 3 or a letter or a string or a symbol then show an error message?

return 0

}

Can someone help me out with this question.

A vehicle moves from a position -4.996 meters from the origin, with initial velocity 3 m/s and acceleration -3.54 m/s^2 for 0.04s. Work out an estimate for its final position. Give your answer to four decimal places.

You might want to use the formula s = ut + 1/2 a t2

I forgot how to use this formula to get the final position value, can someone work it out to jog my memory. thanks

A worm sitting at (2, 9) fires a bazooka along the quadratic Y=-X^2+11X-9 at the line Y=4X+1

I have completely forgotten how to solve these. I dont know how to solve this. Can someone please help me.

How can I access private variables inside of a class? This is my class

class Player{

int PosX;

int PosY;

public:

int set_values(){

srand((unsigned)time(NULL));

PosX = rand()%10+1;

PosY = rand()%10+1;

return 0;

}

I have 2 private variables in my class and I need to get these 2 variables and feed them to another class but I dont know how to access them. I cant make them public because this is for my coursework so variables in a class must be private. I have been goolging around for hours but I cant seem to find the answer. Can someone please help.