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3 years ago

How does the shape of an plane wing help it to lift off the ground and fly

1 answer:

8 0

a planes engines are designed to move it forward at high speed. That makes air flow rapidly over the wings, which throw the air down toward the ground, generating an upward force called lift that overcomes the plane's weight and holds it in the sky. ... The wings force the air downward and that pushes the plane upward

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How to calculate the velocity? the answer is 5.4 m/s I need the explication

Vanyuwa [196]

Answer: sq. root of .735

Explanation:

multiply two on both sides.

(2) *2,94 = (0,200 * v^2) (2)

588 = 0400 * 2v^2

divide by 400 on both sides

1.47 = 2v^2

divide by 2 on both sides

.735 = v^2

take square root of both sides

$\sqrt{.735)$ or .85732141

7 0

3 years ago

If a hiker that weighs 600 newtons climbs a 50 meter hill, how much gravitational potential energy has the hiker gained?

Illusion [34]

The gravitational potential energy U is defined as the product of mass m, the acceleration of gravity g and the height of object h.

$U = mgh$

We do not have the mass of the hiker. But we know that its W weight is:

$W = mg$

Where

$g = 9.8 m/s^2$

So:

$m = \frac{W}{g}\\\\m = \frac{600}{g}$ .

So:

$U = (\frac{600}{g})gh\\\\U = (600N)(50m)$

$U = 30000$ J

The hiker has gained 30,000 J of energy

6 0

3 years ago

17. In which layer does mantle convection occur?

Anarel [89]

Answer:

D. Asthenosphere

Explanation:

The asthenosphere is relatively plastic part of the mantle which underlies the brittle lithosphere. In the asthenosphere, it is generally believed that the rocks are in ductile state and easily moves. It is the site of convection within the earth. In mantle convection, hot and light materials rises and keeps moving into upper crustal levels till they solidify. Here also, cold and denser materials sinks deeper till they turn to melt. This differences in temperature and density sets up a convective cell within the mantle. Several convective cells are in the mantle.

8 0

4 years ago

Why is water often called the "universal solvent"? A. A large amount of energy is needed to raise its temperature. B. It remains

Firlakuza [10]

Answer:

Explanation:

6 0

3 years ago

Which of the following is the best definition of the term pseudopsychology?

blagie [28]

Can you give us the options…?

3 0

3 years ago