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3 years ago

How are dams made do they just freeze time?

Physics

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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A painter is placing a ladder to reach the third story window, which is 39 feet above the ground and makes an angle with the gro

tino4ka555 [31]

Answer:

14.2 ft

Explanation:

The ladder form a right angle triangle with the horizontal angle of 70°

the angle faces the wall which is opposite to the ladder, the length of the ladder is the hypotenuse and the distance of the base from the wall is the adjacent

using trigonometrical ratio

tan 70° = opp ( height of the wall) / adjacent, x ( the distance of the base from the wall) = 39 ft / x

x = 39 ft / tan 70° = 14.195 approx 14.2 ft

3 0

3 years ago

Read 2 more answers

In the middle of the night you are standing a horizontal distance of 14.0 m from the high fence that surrounds the estate of you

olchik [2.2K]

PART A)

horizontal distance that will be moved = 14 m

Height of the fence = 5.0 m

height from which it is thrown = 1.60 m

angle of projection = 54 degree

So here we can say that stone will travel vertically up by distance

$\Delta y = 5 - 1.6 = 3.40 m$

now we will have displacement in horizontal direction

$\Delta x = 14 m$

now we know that

$v_x = vcos54$

$v_y = vsin54$

now we will have

$\Delta x = v_x t$

$14 = (vcos54)t$

also for y direction

$\Delta y = v_y t + \frac{1}{2}at^2$

$3.40 = (vsin54)t - \frac{1}{2}(9.8) t^2$

now from the two equations we will have

$3.40 = (vsin54)(\frac{14}{vcos54}) - 4.9 t^2$

$3.40 = 14 tan54 - 4.9 t^2$

$3.40 = 19.3 - 4.9 t^2$

$t = 1.8 s$

now from above equations

$14 = vcos54 (1.8)$

$v = 13.2 m/s$

So the minimum speed will be 13.2 m/s

Part B)

Total time of the motion after which it will land on the ground will be "t"

so its vertical displacement will be

$\Delta y = -1.60 m$

now we will have

$-1.60 = v_y t + \frac{1}{2}at^2$

$-1.60 = (13.2sin54)t - \frac{1}{2}(9.8)t^2$

$4.9 t^2 - 10.7t - 1.60 = 0$

$t = 2.3 s$

Now the time after which it will reach the fence will be t1 = 1.8 s

so total time after which it will fall on other side of fence

$t_2 = t - t_1$

$t_2 = 2.3 - 1.8 = 0.5 s$

now the displacement on the other side is given as

$\Delta x = (vcos54) t_2$

$\Delta x = (13.2 cos54)(0.5)$

$\Delta x = 3.88 m$

4 0

3 years ago

If a cheetah can run with an average velocity of 90 km/h, how far can it travel

blsea [12.9K]

Answer:

D. 0.75km

Explanation:

first, we have to convert km/h to m/s ( as time is given seconds)

90*1000/3600= 25m/s

cheetah can travel 25 m in 1 sec. therefore, distance it covers in 30 seconds.

25*30/1= 750 meters

in kilometres= 750/1000= 0.75 km

Answer- D. 0.75 km

6 0

3 years ago

Is a glass microscope slide a conductor or insulator

Gwar [14]

It's an insulator because it's glass which means it stops the current

3 0

3 years ago

What are two ways you can increase power by climbing the stairs?

Nina [5.8K]

Answer:

change the

time
distance
force.

Explanation:

P = W/time

W = F*d

You have control over how fast you go up the stairs.

You also have control over how far up the stairs you go.

Therefore the answer is

time
distance

If you don't like distance as an answer, you can carry something up the stairs -- anything that increases F will do.

8 0

3 years ago