## Hovercraft B/C

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### Re: Hovercraft B/C

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?

sciduck
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### Re: Hovercraft B/C

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?
Do I show work?
Last edited by sciduck on February 27th, 2017, 12:05 pm, edited 2 times in total.
SCIDUCK wants to fight!

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Posts: 81
Joined: January 14th, 2016, 4:53 pm
Division: C
State: PA

### Re: Hovercraft B/C

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?
Do I show work?
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

sciduck
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Posts: 98
Joined: May 7th, 2016, 4:50 pm
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State: MN
Location: Wayzata

### Re: Hovercraft B/C

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?
Do I show work?
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.
SCIDUCK wants to fight!

Zioly
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Posts: 152
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### Re: Hovercraft B/C

Do I show work?
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.
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.
2017 Nats Div. B
Inglemoor High School 2018 Div. C

Member
Posts: 81
Joined: January 14th, 2016, 4:53 pm
Division: C
State: PA

### Re: Hovercraft B/C

Do I show work?
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.
Last edited by HandsFreeCookieDunk on March 1st, 2017, 8:28 pm, edited 1 time in total.

Ashernoel
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Posts: 336
Joined: January 27th, 2017, 1:31 pm
State: IL
Location: MA

### Re: Hovercraft B/C

Do I show work?
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.
Last edited by Ashernoel on March 1st, 2017, 9:00 pm, edited 2 times in total.
NT '19
Harvard '23

kenniky
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### Re: Hovercraft B/C

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.
title
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Ashernoel
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### Re: Hovercraft B/C

title
NT '19
Harvard '23

sciduck
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Posts: 98
Joined: May 7th, 2016, 4:50 pm
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State: MN
Location: Wayzata

### Re: Hovercraft B/C

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.
Yup! I lost track of turns, but go for it.
SCIDUCK wants to fight!

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### Re: Hovercraft B/C

Shamelessly copied from the internet....

According to the Guinness Book of World Records, the fastest recorded baseball pitch was delivered by Nolan Ryan in 1974. The pitch was clocked at 100.9 mi/hr (45.0 m/s). Determine the impulse required to give a 0.145-kg baseball such a momentum.

Zioly
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### Re: Hovercraft B/C

Shamelessly copied from the internet....

According to the Guinness Book of World Records, the fastest recorded baseball pitch was delivered by Nolan Ryan in 1974. The pitch was clocked at 100.9 mi/hr (45.0 m/s). Determine the impulse required to give a 0.145-kg baseball such a momentum.
2017 Nats Div. B
Inglemoor High School 2018 Div. C

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Posts: 81
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### Re: Hovercraft B/C

Shamelessly copied from the internet....

According to the Guinness Book of World Records, the fastest recorded baseball pitch was delivered by Nolan Ryan in 1974. The pitch was clocked at 100.9 mi/hr (45.0 m/s). Determine the impulse required to give a 0.145-kg baseball such a momentum.
So close

Zioly
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Posts: 152
Joined: April 17th, 2016, 4:50 pm
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### Re: Hovercraft B/C

Shamelessly copied from the internet....

According to the Guinness Book of World Records, the fastest recorded baseball pitch was delivered by Nolan Ryan in 1974. The pitch was clocked at 100.9 mi/hr (45.0 m/s). Determine the impulse required to give a 0.145-kg baseball such a momentum.
So close
Sorry about that, but wouldn't it be N/s? Also, what unit is momentum in? I had a question on a test the other day and was uncertain... as you can tell, impulse and momentum are concepts I'm not as familiar with.
2017 Nats Div. B
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