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Studentka2010 [4]
4 years ago
15

A key falls from a bridge that is 44 m above the water. It falls directly into a model boat, moving with constant velocity, that

is 19 m from the point of impact when the key is released. What is the speed of the boat
Physics
1 answer:
Lady_Fox [76]4 years ago
6 0

The time t it takes for the key to fall 44 m is

44\,\mathrm m=\dfrac12\left(9.8\,\dfrac{\mathrm m}{\mathrm s^2}\right)t^2\implies t=3.0\,\mathrm s

(notice I'm taking the downward direction to be positive)

The boat, moving at a presumably constant speed, then has 3.0 s to travel 19 m to the point of impact, which means its speed must be

v=\dfrac{19\,\mathrm m}{3.0\,\mathrm s}=6.3\,\dfrac{\mathrm m}{\mathrm s}

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Answer:

Explanation:

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If vector A is along 300 then _A will be along?​
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3 years ago
A spring whose spring constant is 260 lbf/in has an initial force of 100 lbf acting on it. Determine the work, in Btu, required
Readme [11.4K]

Answer:

A spring whose spring constant is 200 lbf/in has an initial force of 100 lbf acting on it. Determine the work, in Btu, required to compress it another 1 inch.

Step 1 of 4

The force at any point during the deflection of the spring is given by,

where is the initial force

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eman Asked on February 19, 2018 in thermal fluid Sciences 4th solutions.

Explanation:

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torisob [31]

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Work = Force * distance

He's going up an incline but pushing parallel to the ground. Draw out a diagram to show what's going on. )


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7 0
4 years ago
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