## Hovercraft B/C

Test your knowledge of various Science Olympiad events.
Adi1008
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### Re: Hovercraft B/C

UTF-8 U+6211 U+662F wrote:
Adi1008 wrote:Suppose I have a bowling ball with a diameter of 25 centimeters. What is the largest mass it can have such that it floats in corn syrup (specific gravity = 1.4)?

Answer

Looks good to me. Your turn!
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UTF-8 U+6211 U+662F
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### Re: Hovercraft B/C

All right! Given a graph of v vs t, how do you find the displacement traveled? What about the distance?

Adi1008
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### Re: Hovercraft B/C

UTF-8 U+6211 U+662F wrote:All right! Given a graph of v vs t, how do you find the displacement traveled? What about the distance?

Answer
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### Re: Hovercraft B/C

Adi1008 wrote:
UTF-8 U+6211 U+662F wrote:All right! Given a graph of v vs t, how do you find the displacement traveled? What about the distance?

Answer

Yep!

Adi1008
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### Re: Hovercraft B/C

UTF-8 U+6211 U+662F wrote:
Adi1008 wrote:
UTF-8 U+6211 U+662F wrote:All right! Given a graph of v vs t, how do you find the displacement traveled? What about the distance?

Answer

Yep!

Suppose you have a contracting star whose new radius is 1/x as big as the old radius.

a. How much faster does the star spin?
b. By what factor does its rotational kinetic energy change?
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MattChina
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### Re: Hovercraft B/C

Adi1008 wrote:
UTF-8 U+6211 U+662F wrote:
Adi1008 wrote:
Answer

Yep!

Suppose you have a contracting star whose new radius is 1/x as big as the old radius.

a. How much faster does the star spin?
b. By what factor does its rotational kinetic energy change?

a. x^2 faster
b. x^2
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2017 events: Hovercraft, Ecology, Optics, Write it do it, Fast Facts, Mystery Design(NY trial)
2018 events: Hovercraft, Ecology, Optics, Thermodynamics, Quiz bowl(NY trial)

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### Re: Hovercraft B/C

It's been a while, so I guess I'll ask a question.

Consider a basketball player throwing a ball into the hoop. The ball is 625 g, and the basketball player throws it at 10 m/s at 65 degrees to the horizontal. Neglect air resistance.

1) Find the force that acts on the ball once it leaves the player's hand.

2) A regulation height hoop is 10 feet tall. Find the distance from the hoop he needs to be if he shoots the ball from just above his head and he is 1.8 m tall.

Edit: Wait hovercraft is being replaced next year

Nydauron
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### Re: Hovercraft B/C

UTF-8 U+6211 U+662F wrote:It's been a while, so I guess I'll ask a question.

Consider a basketball player throwing a ball into the hoop. The ball is 625 g, and the basketball player throws it at 10 m/s at 65 degrees to the horizontal. Neglect air resistance.

1) Find the force that acts on the ball once it leaves the player's hand.

2) A regulation height hoop is 10 feet tall. Find the distance from the hoop he needs to be if he shoots the ball from just above his head and he is 1.8 m tall.

Edit: Wait hovercraft is being replaced next year

Answer
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### Re: Hovercraft B/C

Nydauron wrote:
UTF-8 U+6211 U+662F wrote:It's been a while, so I guess I'll ask a question.

Consider a basketball player throwing a ball into the hoop. The ball is 625 g, and the basketball player throws it at 10 m/s at 65 degrees to the horizontal. Neglect air resistance.

1) Find the force that acts on the ball once it leaves the player's hand.

2) A regulation height hoop is 10 feet tall. Find the distance from the hoop he needs to be if he shoots the ball from just above his head and he is 1.8 m tall.

Edit: Wait hovercraft is being replaced next year

Answer

Okay, hovercraft is gone next year, so I guess there won't be any more questions, but yep, that's right (interestingly, if you used 0.15 s, it would've given you the distance required if he wanted to shoot the basketball through the bottom of the hoop and out the top).

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