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xeze [42]
3 years ago
5

Which is the best example of rotational motion?

Chemistry
2 answers:
Damm [24]3 years ago
5 0

Answer:

a

Explanation:

NemiM [27]3 years ago
4 0
Rotational motion means the body is turning around itself. The best examples are a spin top and earth moving on its own axis around the sun. Wheels turning on a car are also an example of rotational motion.
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Selina drops a golf ball down a deep well. The ball falls with only the force of gravity acting on it. Without any air resistanc
ss7ja [257]

<u>Answer:</u>    A. constant

Without any air resistance, as the golf ball falls into the well, its speed is constant.

<u>Explanation:</u>

Given that when the ball is released,<em>there is no air resistance acting on ball. So the ball is freely falling. </em>

The only force acting on the freely falling body is the gravitational force pulling the body towards the centre of the earth.Here the only acceleration acting on the body is the <em>acceleration due to gravity.</em>

The acceleration due to gravity is 9.8 m/s^2. so through out the journey of the ball,the acceleration is 9.8 m/s^2. <em>So as the acceleration is constant, the speed is also constant.</em>

8 0
3 years ago
At 20 degrees celsius, how much sodium chloride could be dissolved in 2L of water
aalyn [17]
The source below says 35.89g of NaCl dissolve in 100 g of water at 20 °C. 

<span>(35.89g / 100 mL) x (2000 mL) = 718 g

Hope this helped </span>
8 0
3 years ago
A flask is filled with 50.0 ml of 0.15 M HCl acid. Exactly 0.054 grams of CaCo3 are placed in the acid,
ira [324]

Answer:

See explanation

Explanation:

2HCl(aq) + CaCO3(aq) ------->CaCl2(aq) + CO2(g) + H2O(l)

Number of moles of acid present = 50/1000 * 0.15 = 0.0075 moles

Number of moles of calcium carbonate = 0.054g/100 g/mol = 0.00054 moles

2 moles of HCl reacts with 1 mole of calcium carbonate

x moles of HCl reacts with 0.00054 moles of calcium carbonate

x = 2 *  0.00054/1

x = 0.00108 moles of HCl

Amount of acid left = 0.0075 moles - 0.0075 moles = 0.00642 moles

Reaction of HCl and NaOH

HCl(aq) + NaOH(aq) ------> NaCl(aq) + H2O(l)

Since the reaction is in the mole ratio of 1:1

0.00642 moles of HCl is neutralized by 0.00642 moles of NaOH

8 0
3 years ago
How can room things in a house save energy? List at least 5 ways in which you can save heat energy. Explain how each one can sav
pychu [463]

Answer:

brainly

Explanation:

Adjust your day-to-day behaviors.

Replace your light bulbs.

Use smart power strips.

Install a programmable or smart thermostat.

Purchase energy efficient appliances.

3 0
3 years ago
Determine el PH y el % de disociación de una solución de ácido débil, sabiendo que se disuelven 20 gramos del ácido (masa molar=
IceJOKER [234]

Answer:

pH = 4.27. Porcentaje de disociación: 0.03%

Explanation:

El pH de un ácido débil, HX, se obtiene haciendo uso de su equilibrio:

HX(aq) ⇄ H⁺(aq) + X⁻(aq)

Donde la constante de equilibrio, Ka, es

Ka = 1.65x10⁻⁸ = [H⁺] [X⁻] / [HX]

Como los iones H⁺ y X⁻ vienen del mismo equilibrio podemos decir:

[H⁺] = [X⁻]

[HX] es:

20g * (1mol/55g) = 0.3636moles / 2.100L = 0.1732M

Reemplazando es Ka:

1.65x10⁻⁸ = [H⁺] [H⁺] / [0.1732M]

2.858x10⁻⁹ = [H⁺]²

5.35x10⁻⁵M = [H⁺]

pH = -log[H⁺]

<h3>pH = 4.27</h3>

El porcentaje de disociacion es [X⁻] / [HX] inicial * 100

Reemplazando

5.35x10⁻⁵M / 0.1732M * 100

<h3>0.03%</h3>
5 0
3 years ago
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