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max2010maxim [7]
3 years ago
12

What happens to the average kinetic energy of water molecules as water freezes? It decreases as the water absorbs energy from it

s surroundings. It increases as the water absorbs energy from its surroundings. It increases as the water releases energy to its surroundings. It decreases as the water releases energy to its surroundings.
Physics
1 answer:
Morgarella [4.7K]3 years ago
8 0

Answer:the average kinetic energy is directly proportional to the temperature . When water freezes, the temperature decreases and therefore, the average kinetic energy will also decreases as well.

Explanation:

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An electron has a negative charge
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3 years ago
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A 55-kg woman is wearing high heels. If each heel has a circular cross-section 6.0 mm in diameter and she puts all her weight on
bogdanovich [222]

Answer:

The pressure exerted by the woman on the floor is 1.9061 x 10⁷ N/m²

Explanation:

Given;

mass of the woman, m = 55 kg

diameter of the circular heel, d = 6.0 mm

radius of the heel, r = 3.0 mm = 0.003 m

Cross-sectional area of the heel is given by;

A = πr²

A = π(0.003)²

A = 2.8278 x 10⁻⁵ m²

The weight of the woman is given by;

W = mg

W = 55 x 9.8

W = 539 N

The pressure exerted by the woman on the floor is given by;

P = F / A

P = W / A

P = 539 / (2.8278 x 10⁻⁵ )

P = 1.9061 x 10⁷ N/m²

Therefore, the pressure exerted by the woman on the floor is 1.9061 x 10⁷ N/m²

5 0
3 years ago
If you break a piece of glass, the shape of the glass changes, but the properties in the
lutik1710 [3]

Answer:

It would be a physical change because you aren't changing to chemical properties of the glass, just the shape.

6 0
3 years ago
Your roommate is working on his bicycle and has the bike upside down. He spins the 60 cm
tigry1 [53]
Diameter = 60 cm, Radius = 60/2 = 30 cm = 30/100 = 0.3 m.

The pebble in the tread goes by 3 times every second.

This is the same as 3 times per second.

Recall the unit of frequency is Hertz or per second, s⁻¹

So 3 times per second, Frequency, f = 3s⁻¹ or 3 Hertz

For angular motion:

Angular speed, ω = 2πf

                         = 2*π*3

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Linear speed, v = ωr =  6π * 0.3 = 1.8π m/s


Linear acceleration, a = v² / r

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Angular acceleration α = a/r  = 10.8π² / 0.3 = 36π² rad/s²


Angular speed = 6π rad/s ≈ 18.840 rad/s

The linear speed of the pebble = 1.8π  m/s ≈ 5.655 m/s

The angular acceleration = 36π² rad/s² ≈ 355.306 rad/s²

The linear acceleration of the pebble = 10.8π²  m/s ≈ 106.592 m/s²
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True or False: A balanced force acts on different objects, and action-
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Answer:

true

Explanation:

according to the Newton's third law

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