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2 years ago

What fraction of an original element will remain after six half-lives?

Physics

1 answer:

OlgaM077 [116]2 years ago

4 0

Answer:

1/64

Explanation:

After 1 half-life, 1/2 of the element will remain. Therefore, after 6 half lives, (1/2)^6 of the element will remain. (1/2)^6 = 1^6 / 2^6 = 1/64. So, 1/64 of the element will remain after 6 half-lives.

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Which is the best example of force acting in the same direction

marysya [2.9K]

Which is the best example of forces acting in the same direction? a boy lifting his chest off the ground during a pushup. two football players pushing a tackling sled. a person pulling out a garden hose from its reel.

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3 years ago

How do you know whether to put a nine or a 10 in front of the number on the weather station

3241004551 [841]

If the air pressure on the station model is 500 or more, place a 9 in front of this number. If the pressure number on the station is less than 500 add a 10 in front of this number.

Good luck :)

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3 years ago

A man with a mass of 70 kg walks up a flight of stairs that is 5 m tall. Another man with a mass of 80 kg walks up the same flig

Alex_Xolod [135]

It's 'D'. You need to know the time in order to calculate power.

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3 years ago

A certain humidifier operates by raising water to the boiling point and then evaporating it. Every minute 30 g of water at 20◦ C

Sveta_85 [38]

Answer:

The value of total energy needed per minute for the humidifier = 77.78 KJ

Explanation:

Total energy per minute the humidifier required = Energy required to heat water to boiling point) + Energy required to convert liquid water into vapor at the boiling point) ----- (1)

Specific heat of water = 4190 $\frac{J}{kg k}$

The heat of vaporization is = 2256 $\frac{KJ}{kg}$

Mass = 0.030 kg

Energy needed to heat water to boiling point = $m c ( T_{2} - T_{1} )$

Energy needed to heat water to boiling point = 0.030 × 4.19 × (100 - 20)

Energy ( $E_{1}$ ) = 10.08 KJ

Energy needed to convert liquid water into vapor at the boiling point

$E_{2}$ = 0.030 × 2256 = 67.68 KJ

Thus the total energy needed E = $E_{1}$ + $E_{2}$

E = 10.08 + 67.68

E = 77.78 KJ

This is the value of total energy needed per minute for the humidifier.

9 0

4 years ago

What mass of silver will occupy a volume of 87.75 mL? The density of silver is 10.49 g/mL.

Anastaziya [24]

Answer:

The mass of silver that will occupy a volume of 87.75 mL is 920.5 grams.

Explanation:

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space. In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

$density=\frac{mass}{volume}$

So the density of silver is 10.49 g / mL indicates that 10.49 g occupies a volume of 1 mL. Then a rule of three can be applied in the following way: if in 1 mL a mass of 10.49 g is occupied, in 87.75 mL how much mass will it occupy?

$mass=\frac{87.75 mL*10.49 g}{1 mL}$

mass= 920.5 g

The mass of silver that will occupy a volume of 87.75 mL is 920.5 grams.

5 0

3 years ago