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3 years ago

How does the movement of molecules inside a solid block of iron change as the iron is heated?

Physics

2 answers:

Shalnov [3]3 years ago

8 0

A. The molecules move faster.

8_murik_8 [283]3 years ago

4 0

A. the molecules move faster.

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Microwave ovens have a plate that rotates at a rate of about 7.0 rev/min. What is this in revolutions per second?

Lera25 [3.4K]

Answer:

The value is $w = 0.1167 \ rev/second$

Explanation:

From the question we are told that

The rate at which the plate rotates is $w =7.0 \ rev/min$

Generally the revolution per second is mathematically represented as

$w = \frac{7.0}{60}$

=> $w = 0.1167 \ rev/second$

5 0

3 years ago

How many protons are in one kg of lead? b) How many electrons are in one kg of lead? c) What is the total negative charge of the

mina [271]

Answer:

Number of protons = $2.3836\times 10^{26}$

Number of electrons = $2.3836\times 10^{26}$

Charge on these electrons = - $3.8185\times 10^{7}\ C$

Explanation:

1 atom of lead contains 82 protons and 82 electrons

1 mole = $6.023\times 10^{23}$ atoms

Thus,

1 mole of lead contains $82\times 6.023\times 10^{23}$ protons

Also, 1 mole of lead weighs 207.2 g

So,

207.2 g of lead contains $82\times 6.023\times 10^{23}$ protons

1 kg = 1000 g

So,

1000 g or 1 kg of lead contains $\frac {82\times 6.023\times 10^{23}}{207.2}\times 1000$ protons

Number of protons = $2.3836\times 10^{26}$

Also, for neutral atom, number of protons = number of electrons.

Thus,

Number of electrons = $2.3836\times 10^{26}$

Also,

Charge of 1 electron = - $1.602\times 10^{-19}\ C$

Charge on these electrons = - $2.3836\times 10^{26}\times 1.602\times 10^{-19}\ C$

Charge on these electrons = - $3.8185\times 10^{7}\ C$

3 0

3 years ago

Which of the following has longest wavelength, a) blue light b)red light c)x-rays d)gamma rays ?

prisoha [69]

Not sure .sorry I just don't understand.

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3 years ago

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3 years ago

Read 2 more answers

Considering that microwave ovens radiate at 2.45 GHz, how would you respond to the debate

vlada-n [284]

On the off chance that a 2.45 GHz microwave flag is by one means or another radiating from your microwave oven, that is exceptionally perilous and you ought to have it settled or supplanted promptly. A 1000 Watt microwave oven radiating energy into the nearby environment can, contingent upon conditions, make you lose awareness in around 12 to 15 minutes of presentation at a separation of around 10 feet.

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3 years ago