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2 years ago

15

A man needs to lift a heavy box on the back of a truck or push up a ramp or lift it straight up from the ground to use around he

won't have to move the box over a longer distance what did is the benefit of using a ramp to get the box

1 answer:

Nesterboy [21]2 years ago

3 0

The benefits are with the aid of equipment work load is reduced therefore it is great to have as many aiding tool to assist on work

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There are 5 significant figures in the following number. All of the numbers essentially are significant.

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Which contains the greatest mass of oxygen: 0.75 mol of ethanol (C2H5OH), 0.60 mol of formic acid (HCO2H), or 1.0 mol of water (

alisha [4.7K]

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Explanation:Please see attachment for explanation

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3 years ago

Purification of copper can be achieved by electrorefining copper from an impure copper anode onto a pure copper cathode in an el

Likurg_2 [28]

Answer: 281 hours

Explanation:-

1 electron carry charge= $1.6\times 10^{-19}C$

1 mole of electrons contain= $6.023\times 10^{23}$ electrons

Thus 1 mole of electrons carry charge= $\frac{1.6\times 10^{-19}}{1}\times 6.023\times 10^{23}=96500C$

$Cu^{2+}+2e^-\rightarrow Cu$

$96500\times 2=193000Coloumb$ of electricity deposits 1 mole or 63.5 g of copper

0.0635 kg of copper is deposited by 193000 Coloumb

11.5 kg of copper is deposited by= $\frac{193000}{0.0635}\times 11.5=34952756$ Coloumb

$Q=I\times t$

where Q= quantity of electricity in coloumbs = 34952756 C

I = current in amperes = 34.5 A

t= time in seconds = ?

$34952756 C=34.5A\times t$

$t=1013123sec=281hours$

Thus it will take 281 hours to plate 11.5 kg of copper onto the cathode if the current passed through the cell is held constant at 34.5 A.

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3 years ago

A boy weighing kilograms is riding a skateboard. He’s moving at 2 meters/second and has 40 joules of kinetic energy. He doubles

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80 is the correct answer i think I'm not sure

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2 years ago

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I believe it is ice cubes.

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