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notsponge [240]
3 years ago
9

A soccer ball is kicked; it comes to rest after rolling through the grass. Why is this not considered a violation of Newton's Fi

rst Law?
Physics
2 answers:
julsineya [31]3 years ago
7 0

Newton's law states that objects at rest/motion will remain at rest/motion "UNLESS" a force is acted upon it.

So the soccer ball got kicked, and then came to rest. This doesn't state that the soccer ball was still rolling when the force of someone's foot kicked the ball.

Inessa [10]3 years ago
7 0

The ball was put in motion by the kick (an external force). The fact that it failed to continue in a uniform motion is due to (again) an external force acting on it. This time it is the force of <em>friction</em>. The ball rolling through grass hitting small obstacles can be, in aggregate, represented by a force acting against its direction of motion. This force exists until the ball stops. So, Newton's doing fine.

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Two electromagnets contain the same types of magnets
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Answer: The first electromagnet has a more powerful current than

the second

Explanation:

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The first electromagnet has a more powerful current than the second

Because the induced EMF is proportional to the induced current.

Where the induced EMF depends on the speed of the magnet according to the formula below

EMF = BVL

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3 years ago
Which of the following is the best definition of gravity?
IRISSAK [1]

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The FM radio band in most places goes from frequencies of about 89 MHz to 106 MHz. How long is the wavelength of the radiation a
ohaa [14]

Answer:

2.83 m

Explanation:

The relationship between frequency and wavelength for an electromagnetic wave is given by

\lambda=\frac{c}{f}

where

\lambda is the wavelength

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f is the frequency

For the FM radio waves in this problem, we have:

f_1=89 MHz=89\cdot 10^6 Hz is the minimum frequency, so the maximum wavelength is

\lambda_2=\frac{c}{f_1}=\frac{3\cdot 10^8}{89\cdot 10^6}=3.37 m

The maximum frequency is instead

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Therefore, the minimum wavelength is

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8 0
3 years ago
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vlabodo [156]

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Here,

m_1 = Mass of Basketball

m_2 = Mass of Tennis ball

u_1 = Initial velocity of Basketball

u_2 = Initial Velocity of Tennis ball

v_1 = Final velocity of Basketball

v_2 = Final velocity of the tennis ball

Replacing,

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3 0
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