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2 years ago

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

Physics

2 answers:

sashaice [31]2 years ago

8 0

The answer is A. Oxygen

AlekseyPX2 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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Richard walks from his home to his school at a constant speed. it takes him 4 min to travel 100 m. which of the following lines

Sindrei [870]

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2 years ago

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A cat jumps off a piano that is 1.3m high. The initial velocity of the cat is 3m/s at an angle of 37degrees above the horizontal

SpyIntel [72]

Answer:

$x=1.75m$

Explanation:

From the exercise we have that

$y_{o}=1.3m\\v_{o}=3m/s, \beta =37\\$

To find how far from the edge of the piano does the cat strike the floor, we need to calculate its time first

$y=y_{o}+v_{oy}t+\frac{1}{2}gt^{2}$

At the end of the motion y=0m

$0=1.3+3sin(37)t-\frac{1}{2}(9.8)t^{2}$

Solving for t

$t=-0.36 s$ or $t=0.73s$

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Knowing that we can calculate how far does the cat strike the floor

$x=v_{ox}t=3cos(37)(0.73)=1.75m$

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2 years ago

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kap26 [50]

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2 years ago