A sound wave has a frequency of 247 hz and a wavelength of 1.4 m. what is the speed of the sound wave in air?
1 answer:
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1) The gravitational force on Earth is 2.65 N
2) The acceleration of the Earth is
Explanation:
1)
First of all, we start by finding the gravitational force exerted by the Earth on the rock. This is equal to the weight of the rock, which is:
where:
m = 0.27 kg is the mass of the rock
is the acceleration of gravity
Substituting,
Now we can apply Newton's third law, which states that:
<em>"When an object A exerts a force on an object B, then object B exerts an equal and opposite force on object A".</em>
This means that the force exerted by the Earth on the rock (the weight of the rock) is equal in magnitude to the force exerted by the rock on the Earth: therefore, the gravitational force on Earth is also 2.65 N.
2)
To find the acceleration of the Earth, we use Newton's second law:
where:
F is the net force on the Earth
M is the Earth's mass
a is its acceleration
Here we have:
is the Earth's mass
And solving for a:
Learn more about gravity, forces and Newton laws of motion:
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