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3 years ago

10

After using soap to wash dishes by hand, if is sometimes difficult to keep your hands from remaining stick. Explain why rinshing

your hand in lemon juice would make then less slick

1 answer:

gulaghasi [49]3 years ago

6 0

<h2>HOPE THIS HELPS YOU ....</h2><h3>PLEASE MARK ME AS BRAINILIST...</h3>

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A car travels 60 km in the first 2 hours and 68 km in the next 2 hours. What’s the cars average speed?

Klio2033 [76]

Answer:

<u>The car's average speed is 32 kilometers per hour</u>

Explanation:

1. Let's review the information given to us to answer the question correctly:

First two hours = 60 kilometers

Next two hours = 68 kilometers

2. What is the car's average speed?

Total distance traveled by the car = 60 + 68

Total distance traveled by the car = 128

Total time of travel = 2 + 2 hours

Total time of travel = 4 hours

Average speed = Total distance/Total time

Replacing with the real values, we have:

Average speed = 128/4

<u>Average speed = 32 kilometers per hour</u>

4 0

4 years ago

A glass rod is rubbed with nylon. The rod is then brought close to the metal knob of an electroscope. A person's finger briefly

qwelly [4]

Answer:

On removal to the glass rod the leaves of the electroscope will disperse away under the influence of the positive charge due to deficiency of electrons.

Explanation:

When a glass rod is rubbed against a nylon then the electrons from the surface of the glass rod get transferred to the nylon piece and as a result the glass rod attains positive electrostatic charge.

When this positively charged rod is brought close to the knob of an electroscope then the electrons from that metallic of the electroscope feel attraction and move toward the glass rod get concentrated on the knob.

In this situation when any of our body part comes in direct contact to the knob these static concentrated charges get a path to flow from high concentration to a lower concentration under the influence of the electrostatic force of the rod.

So these charges flow into our body from the knob.
Our body acts as a reservoir for the charges on the metallic knob.
Now after the electrons form the knob are transferred to the person's body the electroscope becomes electron deficient and hence positively charged.
So now, on removal to the glass rod the leaves of the electroscope will disperse away under the influence of the positive charge.

5 0

4 years ago

How will you connect 3 cells each of value 2V to give a total of 3V * Two in parallel with one in series Two in series with one

emmainna [20.7K]

Answer:

<em>two of them in series with one in parallel</em>

Explanation:

When two or more batteries are connected in

(a) series: the total voltage produced is equal to the sum of the voltages on each of the batteries. For example, if two batteries A and B of 3V and 2V respectively are connected in series, then the total voltage produced is

3V + 2V = 5V

(b) parallel: the total voltage produced is equal to the voltage on any one of the batteries. As a mention, only batteries of the same voltage should be connected together in parallel. For example, if two batteries A and B each of 4V are connected together in parallel, then the total voltage produced is 4V.

If these batteries are not of the same voltage, then the one of larger voltage will charge the one of the lower voltage until they both have the same voltage. That means that their eventual voltage will be the average of their voltages. For example, if two batteries A and B of 3V and 2V respectively, are connected in parallel, their total voltage will be,

(3V + 2V) / 2 =2.5V

Now, from the question.

Since there are three cells each of value 2V.

=>If we connect two of them in series, the total voltage from those two cells will be 2V + 2V = 4V

=>If we then connect this series connection in parallel with the third cell, then we have a parallel combination of 4V and 2V. Since they have different voltages, then the total voltage will be the average of the two voltages. i.e

(4V + 2V) / 2 = 6 / 2 = 3V

Therefore, to have a total of 3V from three cells each of 2V, we need to connect <em>two of them in series with one in parallel</em>

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5 0

3 years ago

Why electrons flow in a wire when connected to a battery?

vesna_86 [32]

Answer:

The metal atoms in the wire can't move, but their outer electrons can. The force pushes those electrons and they move to further parts of the wire, trying to reach the other end. As the electrons move away, new electrons flow into the wire through the battery to take their place.

Explanation:

6 0

3 years ago

An ice cube tray full of water is put into a freezer. The water eventually reaches 0ºC and undergoes a phase change from a liqui

jek_recluse [69]

Answer:

a

Explanation:

the kinetic energy decreases which makes the molecules bond together, that makes them not be able to move much

3 0

3 years ago