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gtnhenbr [62]
3 years ago
7

The most abundant element in earth's continental crust (by weight) is____?

Physics
2 answers:
sashaice [31]3 years ago
8 0
The answer is A. Oxygen
AlekseyPX3 years ago
5 0

Answer: A. Oxygen

Explanation: Oxygen is the most abundant element in the Earth's crust by weight. Oxygen amounts to 46.6% of the Earth's crust by weight.

Oxygen is a major compound of the silicate minerals where it reacts with other elements. Oxygen can he will receive bottling collected pls, he will pretence as a compound in carbonates and phosphates. Oxygen has industrial, medical, and commercial purposes. It is used with acetylene to cut and weld metals. It is used in hospitals to ease respiratory disease and can also be used to manufacture explosives among other numerous uses.

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A 70 kg student stands on top of a 5.0 m platform diving board . how much gravitational potential energy does the student have?
Marianna [84]

Answer:

a. P.E = 3430Joules.

b. Workdone = 3430Nm

Explanation:

<u>Given the following data;</u>

Mass = 70kg

Distance = 5m

We know that acceleration due to gravity is equal to 9.8m/s²

To find the potential energy;

Potential energy = mgh

P.E = 70*9.8*5

<em>P.E = 3430J</em>

b. To find the workdone;

Workdone = force * distance

But force = mass * acceleration

Force = 70*9.8

Force = 686 Newton.

Workdone = 686 * 5

<em>Workdone = 3430Nm</em>

6 0
2 years ago
A graduated cylinder contains 17.5 ml of water. When a metal cube is placed onto the cylinder, its water level rises to 20.3 ml.
igomit [66]

Answer:

V=2.8 ml

Explanation:

volume of the cube is it would be 20.3 - 17.5 ml so 2.8 ml.

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3 years ago
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Mariulka [41]
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