It is because of conservation of energy since some of the energy is continually being wasted on terms of sound, gravity etc

Area of the circle with 5 m radius is 25*Pi. area * Height = volume.

therefore, 25*3.14*H=4 m3/min

H= 0.50 m/min

First one but I am not sure

**Answer:**

a) = 928 J
, b)U = -62.7 J
, c) K = 0
, d) Y = 11.0367 m, e) v = 15.23 m / s

**Explanation:**

To solve this exercise we will use the concepts of mechanical energy.

a) The elastic potential energy is

= ½ k x²

= ½ 2900 0.80²

= 928 J

b) place the origin at the point of the uncompressed spring, the spider's potential energy

U = m h and

U = 8 9.8 (-0.80)

U = -62.7 J

c) Before releasing the spring the spider is still, so its true speed and therefore the kinetic energy also

K = ½ m v²

K = 0

d) write the energy at two points, maximum compression and maximum height

Em₀ = ke = ½ m x²

= mg y

Emo =

½ k x² = m g y

y = ½ k x² / m g

y = ½ 2900 0.8² / (8 9.8)

y = 11.8367 m

As zero was placed for the spring without stretching the height from that reference is

Y = y- 0.80

Y = 11.8367 -0.80

Y = 11.0367 m

Bonus

Energy for maximum compression and uncompressed spring

Emo = ½ k x² = 928 J

= ½ m v²

Emo =

Emo = ½ m v²

v =√ 2Emo / m

v = √ (2 928/8)

v = 15.23 m / s

**Answer:**

No. Water can be used in a hydroelectric dam to generate electricity, but this does not make us use more or less water in our homes.

**Explanation:**