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fiasKO [112]
3 years ago
5

You are playing catch with a friend in a moving train. When you toss the ball in the direction the train is moving, how does the

speed of the ball appear to an observer standing at rest outside the train?
I know it appears to be traveling faster than the train, but I don't know the technicalities
Physics
1 answer:
S_A_V [24]3 years ago
4 0
I think to an observer outside the train, the speed of the ball will actually look like more than the speed of the train. 
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RSB [31]

The velocities at time <em>t</em> are

• Horizontal:

<em>v</em> = (30.0 m/s) cos(20.0º)

• Vertical:

<em>v</em> = (30.0 m/s) sin(20.0º) - <em>g</em> <em>t</em>

(where <em>g</em> = 9.80 m/s² is the magnitude of the acceleration due to gravity)

If you only want the <u>initial</u> velocities, they are

• Horizontal:

<em>v</em> = (30.0 m/s) cos(20.0º) ≈ 28.2 m/s

• Vertical:

<em>v</em> = (30.0 m/s) sin(20.0º) ≈ 10.3 m/s

(just set <em>t</em> = 0)

As far as starting equations go, you can derive everything from the definition for average acceleration:

<em>a</em> = ∆<em>v</em> / ∆<em>t</em> = (final <em>v</em> - initial <em>v</em>) / <em>t</em>

→   <em>v</em> = <em>u</em> + <em>a</em> <em>t</em>

(here, <em>u</em> stands in for "initial <em>v</em>" and <em>v</em> is simply velocity at time <em>t</em> )

There is no acceleration in the horizontal direction, while the ball is essentially in free-fall in the vertical direction.

6 0
3 years ago
What might be an example of Newton’s First, Second, and Third Law of Motion
ch4aika [34]

First law: A ball is stationary on the ground. It doesn't want to move, but eventually a person will come and kick it.

Second law: A car will never be constant it will have to stop then go . Objects take time to accelerate and also take time to decelerate.

Third law: If your sitting on a chair at a table, and you want to go, what do you do? Push against the table. The table will push back at you and hence, your chair moves. If this law wouldn't work then you would have to move the chair manually.

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3 years ago
What is the relationship between potential and kinetic energy in chemical reactions?
astraxan [27]

Answer:

2 and 3

Explanation:

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3 0
3 years ago
a 10 kg solid disk of radius 0.5 m is rotated about an axis through its center.the disk accelerates from rest to angular speed o
mezya [45]

Answer:

τ ≈ 0.90 N•m

F =

Explanation:

I = ½mR² = ½(10)0.5² = 1.25 kg•m²

α = ω²/2θ = 3.0² / 4π = 0.716... rad/s²

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τ = FR

Now we have the unanswered question of reference frame.

80° from what?

If it's 80° from the radial

F = τ/Rsinθ = 0.90/0.5sin80 = 1.818...  ≈ 1.8 N

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There are an infinite number of other potential solutions

7 0
3 years ago
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