Hovercraft B/C

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sciduck
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Re: Hovercraft B/C

Post by sciduck » January 30th, 2017, 5:33 pm

Zioly wrote:I hope nobody will be upset if I go?

What feats did Sir Christopher Cockerell achieve?
He invented the hovercraft. Don't know what else he did...
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Re: Hovercraft B/C

Post by Zioly » February 1st, 2017, 4:57 pm

sciduck wrote:
Zioly wrote:I hope nobody will be upset if I go?

What feats did Sir Christopher Cockerell achieve?
He invented the hovercraft. Don't know what else he did...
Yeah, sorry about the easy question... I was tired. Anyways, he also was the first to theorize the "air cushion" part of the hovercraft, in which a momentum curtain would effectively prevent the leaking of additional air and trap air in the hovercraft's skirt. It's why almost all hovercrafts have skirts.

Your go! :D
Bottle Rockets: 5th
Ecology: 9th
Hovercraft: 14th
Scrambler: 29th (with a failed run too  ;))
Mousetrap Vehicle
Hovercraft
Ecology
Experimental Design (or other inquiry :P)

...Yes, my profile picture is G2 apEX at the PGL Major Qual.  :lol:

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Re: Hovercraft B/C

Post by sciduck » February 15th, 2017, 5:36 pm

What are the world's largest hovercrafts used for?
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Re: Hovercraft B/C

Post by HandsFreeCookieDunk » February 26th, 2017, 9:26 pm

sciduck wrote:What are the world's largest hovercrafts used for?
I believe that would be the Zubr class, which is used for military transport.

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Re: Hovercraft B/C

Post by sciduck » February 27th, 2017, 5:30 am

HandsFreeCookieDunk wrote:
sciduck wrote:What are the world's largest hovercrafts used for?
I believe that would be the Zubr class, which is used for military transport.
Yup, your turn.
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Re: Hovercraft B/C

Post by HandsFreeCookieDunk » February 27th, 2017, 6:13 am

I guess I'll go to the physics side.

A cylindrical water tank has a small hole in its side through which water is spurting. The hole is 5m above the ground and 1m below the surface of the water. For simplicity's sake, assume the water level in the tank is not dropping. How far horizontally does the water travel before hitting the ground?

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Re: Hovercraft B/C

Post by sciduck » February 27th, 2017, 7:18 am

HandsFreeCookieDunk wrote:I guess I'll go to the physics side.

A cylindrical water tank has a small hole in its side through which water is spurting. The hole is 5m above the ground and 1m below the surface of the water. For simplicity's sake, assume the water level in the tank is not dropping. How far horizontally does the water travel before hitting the ground?
From Bernoulli's principle, I get a velocity of 4.427 m/s.
Let's say that's horizontal velocity, so initial vertical velocity is 0 m/s.
So it'll take 1.01015 s to hit the ground.
No horizontal velocity --> 4.47 m.
Uhhh, 1 sigfig? So ~4m.
Last edited by sciduck on February 27th, 2017, 12:05 pm, edited 2 times in total.
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Re: Hovercraft B/C

Post by HandsFreeCookieDunk » February 27th, 2017, 8:08 am

sciduck wrote:
HandsFreeCookieDunk wrote:I guess I'll go to the physics side.

A cylindrical water tank has a small hole in its side through which water is spurting. The hole is 5m above the ground and 1m below the surface of the water. For simplicity's sake, assume the water level in the tank is not dropping. How far horizontally does the water travel before hitting the ground?
From Bernoulli's principle, I get a velocity of 4.427 m/s.
Let's say that's horizontal velocity, so initial vertical velocity is 0 m/s.
So it'll take 1.01015 s to hit the ground.
No horizontal velocity --> 4.6047 m.
Uhhh, 1 sigfig? So ~5m.
Yeah, sorry about the sigfigs, I was just throwing numbers at it. I was with you until the final step, where x = vt = 4.427 m/s * 1.01015s = 4.472m

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Re: Hovercraft B/C

Post by sciduck » February 27th, 2017, 12:12 pm

HandsFreeCookieDunk wrote:
sciduck wrote:
HandsFreeCookieDunk wrote:I guess I'll go to the physics side.

A cylindrical water tank has a small hole in its side through which water is spurting. The hole is 5m above the ground and 1m below the surface of the water. For simplicity's sake, assume the water level in the tank is not dropping. How far horizontally does the water travel before hitting the ground?
From Bernoulli's principle, I get a velocity of 4.427 m/s.
Let's say that's horizontal velocity, so initial vertical velocity is 0 m/s.
So it'll take 1.01015 s to hit the ground.
No horizontal velocity --> 4.6047 m.
Uhhh, 1 sigfig? So ~5m.
Yeah, sorry about the sigfigs, I was just throwing numbers at it. I was with you until the final step, where x = vt = 4.427 m/s * 1.01015s = 4.472m
Oops, I typed it in my calculator wrong ;a;

Next question: Say you are standing on top of a building and threw a ball A downward with a velocity -v, and threw a different ball B (from the same height) upward with a velocity of v. Then:
A) A will hit the ground with a velocity greater than B's.
B) B will hit the ground with a velocity greater than A's.
C) Both hit the ground at the same speed.
D) Neither of the balls will hit the ground.
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Re: Hovercraft B/C

Post by Zioly » March 1st, 2017, 3:14 pm

sciduck wrote:
HandsFreeCookieDunk wrote:
sciduck wrote:
From Bernoulli's principle, I get a velocity of 4.427 m/s.
Let's say that's horizontal velocity, so initial vertical velocity is 0 m/s.
So it'll take 1.01015 s to hit the ground.
No horizontal velocity --> 4.6047 m.
Uhhh, 1 sigfig? So ~5m.
Yeah, sorry about the sigfigs, I was just throwing numbers at it. I was with you until the final step, where x = vt = 4.427 m/s * 1.01015s = 4.472m
Oops, I typed it in my calculator wrong ;a;

Next question: Say you are standing on top of a building and threw a ball A downward with a velocity -v, and threw a different ball B (from the same height) upward with a velocity of v. Then:
A) A will hit the ground with a velocity greater than B's.
B) B will hit the ground with a velocity greater than A's.
C) Both hit the ground at the same speed.
D) Neither of the balls will hit the ground.
B will hit the ground with a velocity greater than A's, as B will attain a negative velocity, and thus head towards the ground, at a higher starting point than A. Thus, the extra distance needed to be traversed gives ball B a bit more time to accelerate due to gravity.
EDIT: hid the answer
EDIT 2: my answer's wrong. I had a brainfart when I mistook ball A's initial velocity as a simple drop and therefore 0 m/s. HandsFreeCookieDunk's explanation with the energies allowed me to realize my mistake. Sorry 'bout that.
Last edited by Zioly on March 1st, 2017, 8:56 pm, edited 1 time in total.
Bottle Rockets: 5th
Ecology: 9th
Hovercraft: 14th
Scrambler: 29th (with a failed run too  ;))
Mousetrap Vehicle
Hovercraft
Ecology
Experimental Design (or other inquiry :P)

...Yes, my profile picture is G2 apEX at the PGL Major Qual.  :lol:

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