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3 years ago

Which describes what happens when a balloon is rubbed with a wool cloth?

Physics

2 answers:

kherson [118]3 years ago

6 0

Answer:

Explanation:

777dan777 [17]3 years ago

4 0

When a balloon is rubbed with a wool cloth, e<span>lectrons move from the atoms in the balloon to the atoms in the cloth, causing the cloth to have a negative charge. Therefore, the answer is B. Before they were rubbed together, they both had balanced charges. However, after rubbing them, the wool is left with the positive charge, and the balloon with the negative. This causes the atoms in the cloth to flow to the balloon, leaving the cloth with a negative charge.</span>

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An object with a mass of 5.0 kg has a force of 20.0 newtons applied to it. What is the resulting acceleration of the object?

Amanda [17]

By Newton second law of motion
Force = Mass*Acceleration
=> 20N = 5kg*Acceleration
So Acceleration = 20/5 ( Also Acceleration= Force/Mass)
So 20/5 = 4
So Acceleration = 4m/s^2
Hope it helps you!

8 0

3 years ago

What energy is needed to raise the temperature of 2 kg of water from 20 ºC to 100 ºC. The heat capacity of water is 4190 J /kg/

aev [14]

Answer:

670400 J

Explanation:

m = mass of water = 2 kg

T₀ = initial temperature of water = 20 ºC

T = initial temperature of water = 100 ºC

c = heat capacity of water = 4190 J /kg ºC

Q = energy needed to raise the temperature of water

Energy needed to raise the temperature of water is given as

Q = m c (T - T₀)

Inserting the values

Q = (2) (4190) (100 - 20)

Q = 670400 J

5 0

4 years ago

Consider the metal cesium, whose atoms are 0.265 nanometers in radius (for metallic bonds) ... the largest of all the elements.

larisa86 [58]

Answer:

The edge length of the empty space between atoms that reside along [100] directions in a BCC crystal of Cs metal is 0.612 nanometers

Explanation:

For Body centered cubic structure (BCC) crystal in direction [100], the edge length of unit cell is calculated with the formula below;

X = $\frac{4R}{\sqrt{3}}$

Where;

X is the edge length of the empty space between atoms

R is the radius of the cesium atom = 0.265 nanometers

X = (4*0.265)/(√3)

X = 0.612 nanometers

Therefore, the edge length of the empty space between atoms that reside along [100] directions in a BCC crystal of Cs metal is 0.612 nanometers

8 0

4 years ago

As the temperature decreases, the atoms lose energy. The atoms begin to move slower. They are held together by attractive forces

bogdanovich [222]

gas to liquid is the answer

8 0

3 years ago

Read 2 more answers

An object initially at rest accelerates at 5 meters per second2 until it attains a speed of 30 meters per second. What distance

Ipatiy [6.2K]

Answer:

Distance s = 90 meter

Explanation:

Given:

Initial velocity u = 0 m/s

Final velocity v = 30 m/s

Acceleration a = 5 m/s²

Find:

Distance s

Computation:

v² = u² + 2as

30² = 0² + 2(5)(s)

Distance s = 90 meter

5 0

3 years ago