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yaroslaw [1]
3 years ago
6

A 4.2 m board with a mass of 19 kg is pivoted at its center of gravity. A helium balloon attached 0.24 m from the left end of th

e board produces an upward force of 7.1 N. A 3.5 kg book is placed 0.74 m from the left end of the board, and another book of 1.7 kg is placed 0.77 m from the right end of the board. Find the torque on the board and the direction of rotation. (Hint: add the torques.)
Physics
1 answer:
storchak [24]3 years ago
6 0

Answer:

The torque on the board = 11.8 Nm in the anti-clockwise direction

Explanation:

Please find attached the explanation to the answer given.

Download docx
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A 2 feet piece of wire is cut into two pieces and once a piece is bent into a square and the other is bent into an equilateral t
SpyIntel [72]

Answer:

Explanation:

Let x ft be used to make square and 2-x ft be used to make equilateral triangle.

each side of square = x/4

area of square = ( x /4 )²

Each side of triangle

= (2-x) /3

Area of triangle = 1/2 (2-x)²/9 sin 60

= √3 / 36 x (2-x)²

Total area

A = ( x /4 )² +√3 / 36 (2-x)²

For maximum area

dA/dx = 0

1/16( 2x ) -√3 / 36 x2(2-x) = 0

x / 8 - √3(2-x)/ 18 = 0

x / 8 - √3/9 + √3/18 x = 0

x ( 1/8 + √3/18 ) = √3/9

x(.125 +.096 ) = .192

x = .868 ft

3 0
3 years ago
In a completely frictionless Newton's Cradle toy, the change in speed of the balls coming in and those going out is zero. This i
BlackZzzverrR [31]

Answer:

False. The net force is Zero

Explanation:

To answer this question we propose the solution of the problem.

 We have a toy where balls come in and out after crashes between them, this toy forms our system, so all the balls are parts of the system, when the balls collide with each other according to Newton's third law force and action and reaction, so it has the same magnitude, but opposite direction, this is each is applied to some of the objects.

In conclusion of the previous one for the system the net force is Zero, all are internal. Therefore, the only thing that happens is a redistribution of speeds according to the conservation of the moment.

Let's review the answer.

False. The net force is Zero

3 0
3 years ago
How do some businesses believe VR is affecting their training for employees?
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BRAINLIEST OF CORRECT <br>Match the atom to the number of electrons it is likely to gain/lose,​
beks73 [17]

The atoms according to the number of electrons it will lose or gain is matched as follows;

Sodium → lose 1

Nitrogen → gain 3

Sulphur → gain 2

Fluorine → gain 1

Boron → lose 3

Beryllium → lose 2

<h3>Atoms</h3>

Atoms are the building block of matter. The outermost electron of an atom determines the number of electron an atom loose during bonding. Therefore,

  • Na(sodium) with an outermost electron of one will lose 1 electron to attain the octet rule.
  • Nitrogen with an outermost electron of 5 will easily gain 3 electrons to attain the octet rule
  • Sulphur(S) with an outermost electron of 6 will easily gain 2 electrons to attain the octet rule
  • Fluorine with an outermost electron of 7 will easily gain 1 electrons to attain the octet rule
  • Boron with an outermost electron of  3 will easily loose 3 electrons to attain the octet rule
  • Beryllium with an outermost electron of 2 will easily loose 2 electrons to attain the octet rule

learn more on electrons here:brainly.com/question/5141076

6 0
3 years ago
Read 2 more answers
A physical property is
Elis [28]

Answer:

One that we describe using our 5 senses

Explanation:

A physical property describes something we can physically observe.

5 0
3 years ago
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