What does newton's first law describes

1 answer:

5 0

Earlier, we stated Newton's first law as “A body at rest remains at rest or, if in motion, remains in motion at constant velocity unless acted on by a net external force.” It can also be stated as “Every body remains in its state of uniform motion in a straight line unless it is compelled to change that state by forces
For example-A stationary object with no outside force will not move. With no outside forces, a moving object will not stop. An astronaut who has their screwdriver knocked into space will see the screwdriver continue on at the same speed and direction forever.

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Over a time interval of 2.04 years, the velocity of a planet orbiting a distant star reverses direction, changing from +18.2 km/

Marat540 [252]

Explanation:

Initial speed of the planet, u = 18.2 km/s = 18200 m/s

Final speed of the planet, v = -22.9 km/s = -22900 m/s

Time interval, t = 2.04 years

Since, $1\ year =3.154\times 10^7\ s$

Time interval, $t=6.43\times 10^7\ s$

(a) The total change in the planet's velocity is calculated as :

$\Delta v=v-u$

$\Delta v=-22900-18200$

$\Delta v=-41100\ m/s$

(b) Let a is the average acceleration of the planet. It can be calculated as :

$a=\dfrac{v-u}{t}$

$a=\dfrac{-41100\ m/s}{6.43\times 10^7\ s}$

$a=-6.39\times 10^{-4}\ m/s^2$

Hence, this is the required solution.

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A person behind a moving siren will interpret the frequency of the siren as being

Sedbober [7]

A person that is standing behind a moving siren will interpret the frequency to be lower compared to the person that would be standing in front of it. This is because the sound is now moving away from the person behind the siren and at this point the sound is juts lingering but, still very low.

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4 years ago

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If the mass of a pendulum is increased (with other factors controller), would the period (time) decrease or stay the same?

Akimi4 [234]

The period of the pendulum depends only on the length from the pivot to the "center of mass". So if the string has no mass, then the amount of mass on the end doesn't make any difference.
But if the pendulum is suspended on, say, a chain with mass, then the more mass on the bottom, the lower the center of mass is, and the longer the period is.

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What is the resultant displacement? Explain please to

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The resultant<span> is the vector sum of 2 or more vectors. It is the conclusion of adding 2 or more vectors together. If </span>displacement <span>vectors A, B, and C are added together, the result will be vector R.</span>

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It is well known that runners run more slowly around a curved track than a straight one. One hypothesis to explain this is that

barxatty [35]

Answer:

$percentage = 6.27 %$