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4 years ago

How can an individual benefit from participating in the recommended amount of physical activity?

1 answer:

3 0

It will help them stay in better shape resulting in better health, being more physically active, and staying happier as a result.

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1.25 is closer to 1.04 or not ? plz heelp plz

Romashka-Z-Leto [24]

Answer:

No, it is closer to 1.30

Explanation:

3 0

3 years ago

A hiker throws a ball at an angle of 21.0° above the horizontal from a hill 21.0 m high. The hiker’s height is 1.750 m. The magn

nydimaria [60]

Answer:

38.8 m

Explanation:

h = -(21 + 1.75) = - 22.75 m

g = - 9.8 m /s^2

Ux = 14.004 m/s

Uy = + 5.376 m/s

Let the ball hits the ground in time t and at a distance d from the base of hill.

Use second equation of motion

h = Uyt + 0.5 at^2

- 22.75 = 5.376 t - 0.5 x 9.8 t^2

4.9 t^2 - 5.376 t - 22.75 = 0

$t=\frac{5.376\pm \sqrt{5.376^{2}+4\times 4.9\times 22.75}}{9.8}$

By solving

t = 2.77 second

So, horizontal distance

d = Ux t

d = 14.004 x 2.77 = 38.8 m

6 0

3 years ago

In a hydroelectric dam, water falls 35.0 m and then spins a turbine to generate electricity. Suppose the dam is 80% efficient at

anyanavicka [17]

Answer:

Height through the water falls h = 33 m

Efficiency of the of the unit

Power of the production unit

Acceleration due to gravity

9.8

Potential energy of one kg of water

∗

9.8

∗

323.4

Eighty percentage of the above energy is converted into electrical energy.

So eighty percentage of the potential energy of one kg of water

258.72

So mass of water required to flow per second to produce 45 MW of electricity in kilograms

∗

258.72

173933.2096

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Hydroelectric Energy: Definition, Uses, Advantages & Disadvantages

from Earth Science 101: Earth Science

Chapter 23 / Lesson 9

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