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marysya [2.9K]
3 years ago
14

Scientific notation for 7890

Physics
1 answer:
Nuetrik [128]3 years ago
6 0
7.89•10 to the third power
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A hiker walks 20.51 m at 33.16 degrees. What is the Y component of his displacement?
Serhud [2]

Answer:

<em>The y component of his displacement is 11.22 meters</em>

Explanation:

<u>Components of the displacement</u>

The displacement is a vector because it has a magnitude and a direction. Let's suppose a displacement has a magnitude r and a direction θ, measured with respect to the positive x-direction. The horizontal component of the displacement is calculated by:

x=r\cos\theta

The vertical component is calculated by:

y=r\sin\theta

The hiker has a displacement with magnitude r = 20.51 m at an angle of 33.16 degrees. Substituting in the above equation:

y=20.51\sin(33.16^\circ)

y=11.22\ m

The y component of his displacement is 11.22 meters

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Lee skated 36 miles in 3 hours. What was the speed at which Lee
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Explanation:

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In the decomposition of water, why is twice as much hydrogen as oxygen formed?
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D : Hydrogen gas has two atom , and oxygen has one atom

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Is an electrical current which comes from a battery
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Radon-220 is a radioactive gas. It escapes from underground rocks and causes a large part of the natural background radiation in
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Answer: 134 neutrons are there in the nucleus of Radon-220

Explanation:

Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.

Thus, number of protons = atomic number = 86

Mass number is the number of the entities present in the nucleus which is the equal to the sum of the number of protons and electrons.

Mass number = Number of protons + Number of neutrons

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