4 years ago

Explain how sound travels through the air to observer

1 answer:

3 0

Sample:
As soon as the lightning is seen, sound travels in the air for several kilometers until it eventually reaches the observer.

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Two force vectors are oriented such that the angle between their directions is 38 degrees and they have the same magnitude. If t

Usimov [2.4K]

Answer:

Sum of the forces will be equal to 3.479 N

Explanation:

We have given two same forces are oriented at an angle of 38°

Magnitude of each force is given $F_1=F_2=1.84$

We have to find the sum of the forces

Sum of the forces will be equal to

$F=\sqrt{F_1^2+F_2^2+2F_1F_2cos\Theta }$

So sum of the forces will be equal to $F=\sqrt{1.84^2+1.84^2+2\times 1.84\times 1.84\times cos38^{\circ} }=3.479$

So sum of the force will be equal to 3.479 N

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3 years ago

How long does it take a car to cross a 20m bridge if it starts from rest and accelerates at 5 m/s^2?

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The correct answer is 2.8s

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4 years ago

Which of the following statements is true for a cell placed in beaker containing an isotonic solution?

Korvikt [17]

An isotonic solution is a solution in which concentration or solute is equal to that of a cell placed in it. Thus, the system is in dynamic equilibrium, and so water molecules flow in both directions.
The correct answer is C. water molecules flow in both directions at the same rate.

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3 years ago

What is the change in air pressure a good indicator of a change in temperature be a change in the weather I decrease in humidity

Elza [17]

Answer:

Explanation:

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cold air sinks creating high presure

so this means that temprature is realated to presure.

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3 years ago

Calculate the terminal velocity of

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I’m pretty sure it’s a

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