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4 years ago

How long does it take a bird to fly 2.5 km if a bird can fly 23km/h?

1 answer:

6 0

Time = Distance / speed

Time = 2.5 km / 23 km/h

   = 0.1087 hours 1 hour = 60 minutes
   = 0.1087 * 60 minutes
   = 6.522 minutes.

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Water flows through a pipe. The diameter of the pipe at point b is larger than at point a. Where is the water pressure greatest?

FrozenT [24]

The water pressure is greatest at point B which has a larger diameter in this scenario.

<h3>What is Pressure?</h3>

This is defined as the force per unit area of a substance with its unit being Pascal.

The larger diameter will have more force acting on the sides which translates to a greater pressure.

Read more about Pressure here brainly.com/question/25736513

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3 0

2 years ago

Hey can someone help plzzzzz

ohaa [14]

Answer:

Potential Energy stored = mgh ; m : mass, g : gravitational acceleration (let 10m/s) , h : height

Hence,

Energy Stored in the ball = mgh = (2*10*4) J

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8 0

3 years ago

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A ball is thrown upwards from the edge of a cliff. The horizontal velocity and vertical velocity are both 20m/s the distance fro

german

Answer:

20m

6.9s

Explanation:

The vertical velocity of the ball is 20m/s. We can calculate the kinetic energy which gets transferred to potential energy once it gets to the top.

$E_k = E_p$

$0.5mv^2 = mgh$

$h = \frac{0.5v^2}{g}$

we can subtitute v = 20m/s and g = 10m/s2

$h = \frac{0.5*20^2}{10} = 20 m$

So the ball could go 20m high from the child hand, or 120m fro the bottom of the cliff.

The time it takes for the ball to travels to the top is the time it takes for it to decelerate from 20m/s to 0m/s with gravitational deceleration g = 10m/s2

t = v / g = 20 / 10 = 2s

Then the ball will start accelerating down ward with a constant acceleration of g = 10m/s. In order to cover distance d of 120m from the top to the bottom of the cliff

$d = \frac{gt_2^2}{2}$

$t^2 = \frac{2d}{g} = \frac{2*120}{10} = 24$

$t = \sqrt{24} = 4.9s$

So the total time it takes is 4.9 + 2 = 6.9s

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3 years ago

What is Newton's law of universal gravitation?

pshichka [43]

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3 years ago

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Which statement about the reaction is correct?

balu736 [363]

Answer:

I think D am not pretty show

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3 years ago