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2 years ago

Landon attends an early childhood program that is located at a community center which also runs an adult care program.

Physics

1 answer:

Ira Lisetskai [31]2 years ago

3 0

Good for Landon. What’s the question?

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A hoop of mass 2 kg, radius 0.5 m is rotating about its center with an angular speed of 3 rad's. A force of 10N is applied tange

Degger [83]

Answer:

The rotational kinetic energy of the hoop and the instantaneous change rate of the kinetic energy are 2.25 J and 15 J.

Explanation:

Given that,

Mass = 2 kg

Radius = 0.5 m

Angular speed = 3 rad/s

Force = 10 N

(I). We need to calculate the rotational kinetic energy

Using formula of kinetic energy

$K.E =\dfrac{1}{2}\timesI\omega^2$

$K.E=\dfrac{1}{2}\times mr^2\times\omega^2$

$K.E=\dfrac{1}{2}\times2\times(0.5)^2\times(3)^2$

$K.E=2.25\ J$

(II). We need to calculate the instantaneous change rate of the kinetic energy

Using formula of kinetic energy

$K.E=\dfrac{1}{2}mv^2$

On differentiating

$\dfrac{K.E}{dt}=\dfrac{1}{2}m\times2v\times\dfrac{dv}{dt}$

$\dfrac{K.T}{dt}=mva$ ....(I)

Using newton's second law

$F = ma$

$a= \dfrac{F}{m}$

$a=\dfrac{10}{2}$

$a=5 m/s^2$

Put the value of a in equation (I)

$\dfrac{K.E}{dt}=mva$

$\dfrac{K.E}{dt}=mr\omega a$

$\dfrac{K.E}{dt}=2\times0.5\times3\times5$

$\dfrac{K.E}{dt}=15\ J/s$

Hence, The rotational kinetic energy of the hoop and the instantaneous change rate of the kinetic energy are 2.25 J and 15 J.

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2 years ago

Amber is a<br>(a) metal<br>(b) rubber<br>(c) resin<br>(d) sugar<br>

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Answer:

c. Resin.

Explanation:

Amber is a resin.

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Answer:

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Explanation:

For the quiz in K12

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The lung volume that represents the maximum amount of exchangeable air is the _____

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The lung volume that represents the maximum amount of exchangeable air is the: <u>vital capacity</u>

<u></u>

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The substance that is made of atoms of more than one type bound together is called an atomic bond or a multi bond

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