My rounding is off - can anyone try this?

[jaytm2291]

My rounding is off and I only have one more try left. Can anyone try this and let me know what you get? Thanks.

Screenshot
http://gyazo.com/5998abed43217c95462f69f4e946a09c.png

 

[ehild]

There are two points where the ball is at 6.3 height. You have to choose the point where the ball descends: the higher root of the quadratic equation.

ehild

 

[jaytm2291]

What equation?

 

[ehild]

What equation?

The equation between y and x of a projectile.

ehild

 

[jaytm2291]

I'm sorry you aren't being very clear. I didn't use a quadratic equation but I would like to. THis is due in about an hr. I have one try left. Please help me out instead of just giving me one word answers. Thanks.

 

[ehild]

What value of g you have used? And do not round v0 when you calculate this distance. I am not allowed to give the result, sorry, but I would say that your value is correct within 2 percent. My one is a bit higher than 2.4 m.

ehild

 

[jaytm2291]

So I would have:

y=.33 tan(x)-4.9 (.33/(18.1 cos(x))^2

?

 

[JaredJames]

If your rounding is off, why don't you go through your calculations from the start and not round anything, at all. That way you will get the most accurate answer possible.

All you're asking here is for someone to do that for you, which they may do, but they can't give you the answer so it serves no purpose aside from to say your answer is wrong (which you know from the test).

You can easily go through it again from the start without rounding in well under an hour.

As it stands, I can go through it but my response will be no different to ehild. I can only tell you that your answer is incorrect and roughly how far out you are.

Jared

 

[jaytm2291]

My calculations don't work for the real answer, but they do for the practice answer.

 

[JaredJames]

My calculations don't work for the real answer, but they do for the practice answer.

In your original post you only mention your rounding is off, nothing is mentioned about the calculations. You should have been far more specific in the original post to stand a better chance at getting your required response.

From reading the OP, everyone will give the same response as per ehild and what I said in my previous post.

Jared

 

[ehild]

So I would have:

y=.33 tan(x)-4.9 (.33/(18.1 cos(x))^2

?

This equation is wrong. Find the proper equation between the x and y coordinates of the projectile. The argument of the tangent and cosine is the launch angle with respect to the horizontal. It is given, 53 degrees. Why do you consider it unknown?

ehild