PHYSICS MIDDLE SCHOOL

What is the change all living things undergo as the grow

Answers

Answer 1
Answer: All of the change that living things undergo as they grow is called development. That is the name when the changes are within a single unit and over a period of time as short as a lifetime. When the change occurs over thousands of years then it's called evolution.

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If launched at the right speed, what could eventually happen to objects launched from Newton's theoretical cannon on the top of a mountain?

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If the speed is higher than the orbital velocity, but not high enough to leave Earth altogether (lower than the escape velocity), it will continue revolving around Earth along an elliptical orbit. (D) for example horizontal speed of 7,300 to approximately 10,000 m/s for Earth.

Why is a conductor important in science terms

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A conductor is important to science terms because conductors conduct heat which means they keep something hot. Insulators are the opposite.

Which device provides electrical energy to run an electric circuit

Answers

The battery provides electrical energy to run an electric circuit

There are many risks associated with nuclear power. Which is NOT a risk associated with nuclear power?A) reactor accidents
B) renewable energy source
C) water contamination near plants
D) radiation exposure can cause cancer

Next:

The process shown in this diagram contributed great amounts of heat to the young planet Earth and is best known as radioactive
A) decay.
B) fission.
C) fusion.
D) isotope.

(Diagram in attachments)

Answers

Renewable energy source 

Radioactive Decay

Hope it helps.
1. I think is letter b.
2. I thinks it's letter c.

If an organism starts from only one cell,how do we get different body parts and organs

Answers


Every cell has chromosomes in its nucleus.  In a human cell,
there are 26 of them. AND ... lined up on every chromosome
are thousands and thousands of GENES.  Those carry the
instructions for what kind of organ or bone or tissue or hair
this cell will be used to build, how the structure will work, how
tall you will be, what color your eyes will be, how deep your
voice will be, and what illnesses you will have. 

Every cell has the complete set of instructions in it.  In the past
several years, we have just started to be able to read them, and
extraordinary progress has been made.  There's an awful long way
still left to go.    

A merry -go-round rotates at the rate of 0.4rev / s with an 78 kg man standing at a point 1.5 m from the axis of rotation. What is the new angular speed when the man walks to a point m from the center? Consider the merry-go-round is a solid 11 kg cylinder of radius of 1,5 m. Answer in units of rad/s. 024 (part 2 of 2) 10.0 points What is the change in kinetic energy due to this movement ? Answer in units of

Answers

1) Final angular velocity is 5.22 rad/s

2) Change in kinetic energy: 639.8 J

Explanation:

1)

In absence of external forces, the angular momentum of the merry-go-round must be conserved.

So we can write:

L_1 = L_2\nI_1\omega_1 = I_2 \omega_2

where

I_1 is the initial moment of inertia

I_2 is the final moment of inertia

\omega_1 is the initial angular velocity

\omega_2 is the final angular velocity

At the beginning, we have:

\omega_1=0.4 rev/s \cdot 2\pi = 2.51 rad/s

The moment of inertia is the sum of the moment of inertia of the cylinder + the moment of inertia of the man, therefore:

I_1 = (1)/(2)MR^2+mr^2=(1)/(2)(11)(1.5)^2+(78)(1.5)^2=187.9 kgm^2

The man later walks to a point 1 m from the centre, so the final moment of inertia is:

I_2 = (1)/(2)MR^2+mr^2=(1)/(2)(11)(1.5)^2+(78)(1)^2=90.4 kgm^2

Therefore, the final angular velocity is

\omega_2 = (I_1 \omega_1)/(I_2)=((187.9)(2.51))/(90.4)=5.22 rad/s

2)

The angular velocity of the merry-go-round rotating is given by

K=(1)/(2)I\omega^2

In the  first situation, we have

I_1 = 187.9 kg m^2\n\omega=2.51 rad/s

Therefore

K_1 = (1)/(2)(187.9)(2.51)^2=591.8 J

In the second situation, we have

I_2= 90.4 kg m^2\n\omega_2=5.22 rad/s

Therefore

K_2=(1)/(2)(90.4)(5.22)^2=1231.6 J

So the change in kinetic energy is

\Delta K = K_2 - K_1 = 1231.6-591.8=639.8 J

Learn more about circular motion:

brainly.com/question/2562955

brainly.com/question/6372960

#LearnwithBrainly
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