Physics Q

A Knight of the Round Table fires off a vat of
burning pitch from his catapult at 14.3 m/s,
at 37 ◦ above the horizontal.
The acceleration of gravity is 9.8 m/s2 .
How long is it in the air?
Answer in units of s.

Ahmed your gona fail the physics regents.

2*14.3 * cos 37 / 9.81

Punch in the number in your calc you frooblet.

I thought it was sin the angle since we need the y-component?

horizontal is the x you frooblet

I know you noob. We want the VERTICAL.

Allow me to explain this for Frooblets like Ahmed.If you want to know the time it took to go across you use cosine.

Well guess what noob Lev. I put it on UTexas and it said you are WRONG.

UT is wrong then what number did you get?

Wrong!

You are WRONG NOOB!!!

I then did 2*sin angle*velocity/9.8

And I got it correct NOOB!

UT is wrong then you frooblet

LOL, you are wrong. I already looked this question on google before asking. The two noobs also said sin but they ddn't say the x2 part.

You are going to fail Lev...so don't be surprised.

i've given up on Physics a loooong time ago, but like i'll have a go at the Q later on today.

You don't need to lol. I already solved it.

Oh my god! I know this 0_0 we did it in math class.

A Knight of the Round Table fires off a vat of
burning pitch from his catapult at 14.3 m/s,
at 37 ◦ above the horizontal.
The acceleration of gravity is 9.8 m/s2 .
How long is it in the air?
Answer in units of s.

14.3*cos(37) = whatever, I don't have a calculator. I'll just call it x.
Now you have the vertical velocity at the start.
14.3*sin(37) = something else. that's the horizontal velocity, and it never changes. This will be Y.
First you have to get the time to the peak. Simply divide X by 9.8.
You then have only the time from the peak to the ground left to figure out, but that requires a whole lot. Oh crap, I'm starting to forget this...

Owait you solved it.

This is physics.

And I already solved it up there ^^^

Ahmed IV wrote:LOL, you are wrong. I already looked this question on google before asking. The two noobs also said sin but they ddn't say the x2 part.

You are going to fail Lev...so don't be surprised.

You don't use a x2, and I'm sure of that.

Well I got the right answer by doing that.

that makes life simpler >.>

Explain why the answer is 1J:

The work done in lifting an apple one meter
near Earth’s surface is approximately

cause u use mgh. 10*1*.1=1J (we did it class)

The other choices for the MC dont make sense too

But how do you know that the mass is 1kg?

The mass is .1
10 m/s^2 *1 m *.1 KG = 1J