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andrey2020 [161]
3 years ago
8

Both speed and velocity measure how fast something is moving. However, since speed is not a _________ it does not require a(n) _

__________ .
A) quantity, unit
B) magnitude, unit
C) vector, direction
D) scalar, direction
Physics
2 answers:
mafiozo [28]3 years ago
8 0

The answer is C.

Hope this helps you!

Sladkaya [172]3 years ago
8 0

Both speed and velocity measure how fast something is moving. However, since speed is not a vector it does not require a direction.

Answer: Option C

<u>Explanation:</u>

Depending upon the direction and magnitude, the quantities are classified as scalar and vector quantities. Scalars are used to denote magnitude whereas vector for both magnitude and direction.

Speed is an example of magnitude, so scalar quantity as it denotes the distance travelled with respect to time whereas velocity is also the same along with the direction of the object. For car, speed is important, when it comes to aircraft and laes, velocity is used.

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If two children, with masses of 16 kg and 24 kg , sit in seats opposite one another, what is the moment of inertia about the rot
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Answer:

The moment of inertia about the rotation axis is 117.45 kg-m²

Explanation:

Given that,

Mass of one child = 16 kg

Mass of second child = 24 kg

Suppose a playground toy has two seats, each 6.1 kg, attached to very light rods of length r = 1.5 m.

We need to calculate the moment of inertia

Using formula of moment of inertia

I=I_{1}+I_{2}

I=(m+m_{1})\times r^2+(m+m_{2})\times r^2

m = mass of seat

m₁ =mass of one child

m₂ = mass of second child

r = radius of rod

Put the value into the formula

I=(16+6.1)\times(1.5)^2+(24+6.1)\times(1.5)^2

I=117.45\ kg-m^2

Hence, The moment of inertia about the rotation axis is 117.45 kg-m²

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