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2 years ago

Water cycle

1 answer:

8 0

Type into google: " water cycle" and this comes up.... put it in to your own words. This is very easy.

the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation as rain and snow, drainage in streams and rivers, and return to the atmosphere by evaporation and transpiration.

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What does the atomic number of an atom tell us?

blondinia [14]

Answer:

The number of protons in the atom!

Explanation:

8 0

2 years ago

Read 2 more answers

Indicate whether each of the following statements is true or false. In a coal-fired power plant, chemical energy is first conver

denis23 [38]

Answer:

1. In a coal-fired power plant, chemical energy is first converted to thermal energy. TRUE.

The chemical energy in the coal is converted to thermal energy when the coal is burnt to produce steam.

2. In a coal-fired power plant, approximately 2/5 of original energy in the coal is lost to heat. FALSE.

Approximately 3/5 of the original energy is lost not 2/5 so this statement is false.

3. The molecules in cold air move faster than in hot air. FALSE.

Molecules with more heat move faster than molecules with less. Molecules in cold air therefore, will move slower than molecules in hot air.

6 0

2 years ago

Hubble's law states that the farther away a galaxy is, the faster it moves away from us.

aleksley [76]

Answer:

Yes it is true

As the Hubble's law states that the observation in physical cosmology that galaxies are moving away from the Earth at speeds proportional to their distance.

Explanation:

4 0

2 years ago

A 75 kg soccer player jumps vertically upwards and heads the 0.45 kg ball as it is descending vertically with a speed of 24 m/s.

Vikentia [17]

Answer:

31.66 m/s

Explanation:

mass of player, M = 75 kg

mass of ball, m = 0.45 kg

initial velocity of player, U = + 4 m/s

initial velocity of ball, u = - 24 m/s

Let the final speed of player is V and the ball is v.

use conservation of momentum

Momentum before collision = momentum after collision

75 x 4 - 0.45 x 24 = 75 x V + 0.45 x v

289.2 = 75 V + 0.45 v .... (1)

As the collision is perfectly elastic, coefficient of restitution,e = 1

So, $e=\frac{v_{1}-v_{2}}{u_{2}-u_{1}}$

V - v = u - U

V - v = -24 - 4 = - 28

V = v - 28, put this value in equation (1), we get

289.2 = 75 (v - 28) + 045 v

289.2 = 75 v - 2100 + 0.45 v

2389.2 = 75.45 v

v = 31.66 m/s

Thus, the velocity of ball after collision is 31.66 m/.

7 0

3 years ago

If the solid, liquid, and gas have the same mass of 24 g, then what would the volume of the solid, liquid, or gas be greater? Ex

nikitadnepr [17]

I think it would be gas.The gas isn’t tightly compacted together and liquid can move but it’s still at a height and a solid is short

7 0

2 years ago