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asambeis [7]
3 years ago
14

I want to ask about science

Physics
2 answers:
borishaifa [10]3 years ago
7 0
The answer to this question is TRUE
muminat3 years ago
5 0
The statement is true.
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A meter stick is pivoted at its 50 cm mark but does not balance because of non-uniformities in its material that cause its cente
Cerrena [4.2K]

Answer:

The mass of the stick is:

M=0,9428kg

The center of mass is at the 48,41cm mark

Explanation:

To be balanced in any case the resultant torque of the system must be zero.

For the first situation:

We have a 0,15kg mass al -0,4m from the pivot point, and a 0,3kg mass at +0,25m of the pivot point. On the other hand we know that the center of gravity of the stick is not at the 50cm mark point, so it will be at a X distance with a mass M, the torque sum:

0,15kg*(-0,4m)+0,3kg*0,25m+X*M=0

So:

(1)X*M=-0,015kgm

For the second situation:

Now the weights are interchanged, and as the pivot point has change, the distances from the pivot point are different:

We have a 0,3kg mass al -0,33m from the pivot point, and a 0,15kg mass at +0,32m of the pivot point. As the pivot has moved we have to move our reference for X: The center of gravity of the stick is at a X+0,07m distance with a mass M, the torque sum:

0,3kg*(-0,33m)+0,15kg*0,32m+(X+0,07m)*M=0

(X+0,07m)*M=0,051kgm

X*M+0,07m*M=0,051kgm

replacing X*M from (1):

-0,015kgm+0,07m*M=0,051kgm

The mass of the stick is:

M=(0,051kgm+0,015kgm)/0,07m=0,9428kg

and replacing this in (1):

X*0,9428kg=-0,015kgm

X=-0,015kgm/0,9428kg=-0,0159m=-1,59cm

As we took the 50cm mark as the reference, the center of mass is at the 48,41cm  mark

8 0
3 years ago
PLEASE HELP IVE BEEN STUCK ON THIS FOR 3HOURS!
Anika [276]

Answer:

The river bank can expand due to the water breaking apart which can cause sediment to move and change/erode

5 0
3 years ago
Part 1. Define the following terminologies
skelet666 [1.2K]

Answer:

1: Elements are substances that cannot be broken down into more substances.

2: Compounds are a group of elements in a specific ratio.

3: A metalloid is between a metal and a non-metal.

4: A physical property is a property you can see or touch.

5: A chemical property is a property seen in chemical reactions.

6: Alloys are the combination of two or more metals to make a better material.

7: An insulator doesn't let heat and sound escape.

8: Corrosion is when a metal reacts to oxygen, water, or sulfur.

9: Rust is when a metal is exposed to oxygen

Explanation:

5 0
2 years ago
What is the current in a circuit with a 4.5 V battery and a 9 Ω resistor?
horsena [70]

Answer:

V=I×R

<em>4</em><em>.</em><em>5</em><em> </em><em>=</em><em> </em><em>I×</em><em>9</em>

<em> </em><em> </em><em> </em><em>I</em><em>.</em><em> </em><em>=</em><em> </em><em>4</em><em>.</em><em>5</em><em>/</em><em>9</em>

<em> </em><em> </em><em> </em><em>I</em><em>. </em><em>=</em><em> </em><em>0</em><em>.</em><em>5</em><em> </em><em>A</em>

<em>curre</em><em>nt</em><em> </em><em>is</em><em> </em><em>0</em><em>.</em><em>5</em><em> </em><em>A</em>

3 0
2 years ago
Read 2 more answers
please solve this for me ,A garden roller is pulled with a force of 200N acting at an angle of 50 degree with the ground level.f
Bingel [31]

Answer:

The force pulling the roller along the ground is 128.55 N

Explanation:

A force of 200 N acting at an angle of 50° with the ground level

This force is pulled a garden roller

We need to find the force pulling the roller along the ground

The force that pulling the roller along the ground is the horizontal

component of the force acting

→ The force acting is 200 N at direction 50° with ground (horizontal)

→ The horizontal component = F cosФ

→ F = 200 N , Ф = 50

→ The horizontal component = 200 cos(50) = 128.55 N

128.55 N is the horizontal component of the force that pulling the

roller along the ground

<em>The force pulling the roller along the ground is 128.55 N</em>

8 0
3 years ago
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