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3 years ago

7

How are dams made do they just freeze time?

2 answers:

lina2011 [118]3 years ago

6 0

Answer:

Gravity dams are so named because they are held to the ground by gravity – they weigh a lot, and are typically made from concrete or stone. Engineers must de-water the river where the dam is meant to be built. This is done by diverting the river through a tunnel that runs around the intended construction zone.

bearhunter [10]3 years ago

6 0

Answer:First, they dug tunnels from below the dam to above the dam. Then, they put the cofferdam in place, and opened the tunnels. The water flowed around the site where the permanent dam would be built until they were done, at which point the cofferdam was removed.

Explanation:hope this helped

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Solve the equation below for vi.<br> d=vit +.5at2

Andrej [43]

Answer: $\dfrac{d-0.5at^2}{t}=v_i$

<u>Explanation:</u>

$d=v_it+0.5at^2\\\\\\\text{Subtract}\ 0.5at^2\ \text {from both sides:}\\d-0.5at^2=v_it\\\\\\\text{Divide both sides by t:}\\\dfrac{d-0.5at^2}{t}=v_i$

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2 years ago

A 3.5 kg object moving at 8.1 m/s in the positive direction of an x axis has a one-dimensional elastic collision with an object

Tamiku [17]

Answer:

So the mass of the second object M will be 1.951 kg

Explanation:

We have given mass of the first object $m_1=3.5kg$ and its velocity $v_1=8.1m/sec$

Mass of the second object $m_2=M$ it is at rest so its velocity $v_2=0$

From conservation of momentum we know that

Initial momentum = final momentum

So $m_1v_1+m_2v_2=(m_1+m_2)v$

$3.5\times 8.1+M\times 0=(3.5+M)5.2$

$28.35=18.2+5.2M$

M = 1.951 kg

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2 years ago

2 Name the device in a car that we use to change the speed of the car

Crank

Answer:

Speedometer

Explanation:

Have a good day! :3

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2 years ago

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Serjik [45]

I wouldn't participate in any event, I'd leave the track and field team.

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2 years ago

You jump off a table and hit the ground with a final velocity of 4.23m/s. How long were you falling?

mihalych1998 [28]

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3 years ago

Read 2 more answers