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3 years ago

___have a definite shape and do not easily take the shape of their container

Physics

1 answer:

makkiz [27]3 years ago

6 0

Answer:

Explanation:

A solid comes into your hands with a definite shape. Think of something like a rock. It is not going to be easy to change its shape. So the answer is a solid.

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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.

3 0

2 years ago

Which of these circuit schematics has an ammeter? Α. Α B. B C. C D. D

madam [21]

Answer:

d is the correct answer for this question hope it helps

Explanation:

when you see a A in a circle the the ammeter

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3 years ago

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a_sh-v [17]

Answer:

ozone or O3 is a chemical compound

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3 years ago

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wlad13 [49]

5 is a prime number because it only has two factors which are 1 and 5.

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1 year ago

Two blocks of the same mass but made of different material slide across a horizontal, rough surface and eventually come to rest.

Akimi4 [234]

Answer:

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