3 years ago

If oxygen and steel wool are combined is it a physical change or chemical change?

Physics

2 answers:

JulijaS [17]3 years ago

8 0

Answer:

Chemical change

Explanation:

If both combined it will be a chemical change

Physical change can be reversed easily; chemical change cannot be changed back to previous state

Anon25 [30]3 years ago

4 0

Answer:

I think it would be a chemical change.

Explanation:

Because a physical would be like crushing it or something along that line.

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If 1.4% of the mass of a human body is calcium, how many kilograms of calcium are there in a 195-pound man?

Mamont248 [21]

Answer:

1.241 kg

Explanation:

The mass of the man in kg is 195 pound * (1/2.2) kg/pound = 195/2.2 = 88.64 kg

If 1.4% of the mass of a human body is calcium, then the mass of calcium inside the 88.64 kg man is

1.4% * 88.64 = 88.64*1.4/100 = 1.241 kg

So there's 1.241 kg of calcium inside a 195-pound man

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3 years ago

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viva [34]

Answer:

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Explanation:

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2 years ago

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spayn [35]

Answer:

10-15mph

Explanation:

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3 years ago

Meg walks 5 blocks south and then turns around and walks 8 blocks back to the north. The distance that she walks is 13 blocks. W

Drupady [299]

Three blocks north of where she started.

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3 years ago

Suppose you have a 115 kg wooden crate resting on a wood floor, with coefficient of static friction 0.500 between these wood sur

alexdok [17]

Answer:

maximum force (in N) can you exert horizontally on the crate without moving it = 564.075 N

Explanation:

Given data:

mass m= 115 kg

coefficient of friction μ =0.5

according to newton law of motion the net force acted on body is given by

$F_{net}=ma=F_{max}- F_{f}$

here the body is in rest ,

$F_{net}=0\\\Rightarrow F_{max}=F_{f}\\\text{frriction force} F_{f} = \mu\times N\\$

N= it is the normal reaction force

N= mg = 115×9.81

therefore,

$F_{f} = 0.5\times115\times9.81 = 564.075 N = F_{max}$

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3 years ago