3 years ago

10What is the acceleration due to gravity if an object falls from a height of 25 m?!

Physics

1 answer:

jonny [76]3 years ago

3 0

Answer:

D. 9.81 m/s²

Explanation:

Near the surface of the earth, the acceleration due to gravity is 9.81 m/s² towards the earth's center.

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A 70-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. Neglect air resistan

yKpoI14uk [10]

Answer:

$h_{B} = 6.083\,m$

Explanation:

Let assume that pole vaulter begins running at a height of zero. The pole vaulter is modelled after the Principle of Energy Conservation:

$K_{A} = K_{B} + U_{g,B}$

$\frac{1}{2}\cdot m \cdot v_{A}^{2} = \frac{1}{2}\cdot m \cdot v_{B}^{2} + m\cdot g \cdot h_{B}$

The expression is simplified and final height is cleared within the equation:

$\frac{1}{2}\cdot (v_{A}^{2} - v_{B}^{2}) = g\cdot h_{B}$

$h_{B} = \frac{(v_{A}^{2}-v_{B}^{2})}{2\cdot g}$

$h_{B} = \frac{[(11\,\frac{m}{s} )^{2}-(1.3\,\frac{m}{s} )^{2}]}{2\cdot (9.807\,\frac{m}{s^{2}} )}$

$h_{B} = 6.083\,m$

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3 years ago

The chart shows data for four moving objects.

vesna_86 [32]

Answer:

Explanation:

by adding all the numbers

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What are other countries public reaction to climate change?

tangare [24]

Other countries have reacted the same way as the United States has.

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Fiesta28 [93]

The answer should be B - lasts longer.

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To Mr. H's disgust, a 450-g black crow is raiding the recently-filled bird feeder. As Mr. H runs out the back door with his broo

bagirrra123 [75]

Answer:

Actually it's 2.50 m/s, sorry

Explanation:

It is solved by using momentum conservation equation

combined mass of crow and feeder = 450+670=1120 gm

let the recoil speed of feeder be v m/s

Then applying momentum conservation we get;

1120×1.5 = 670×v

v= 2.50 m/s

the speed at which the feeder initially recoils backwards = 2.50 m/s

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3 years ago