Define the moment of a force

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Answer 1

Answer:

The moment of a force can be described by a force applied to the end of an object whose other end is attached to a pivot or hinge, the force will tend to rotate the object about the pivot and the force have a turning effect.

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Which of the following subsets of R³ are actually subspaces? (a) The plane of vectors (b1,b2,b3) with b1=b2 (b) The plane of vectors with b1=1 (c) The vectors with b1b2b3=0 .
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A total of 233 electrons pass a point in a circuit in 45 minutes. What is the current?

PLEASE HELP. Really important

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Explanation:

2) C would need the least effort, because the longer the effort distance, the least the effort applied.

When white light splits into the spectrum of colours of which it is composed, it is said to have undergone

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When white light splits into the spectrum of colors of which it is composed, it is said to have undergone dispersion. Dispersion happens when white light gets separated into colors based on the wavelength of the light. Due to dispersion of light, people can see a rainbow in the sky. I hope the answer helps.

A coin is placed in an empty beaker. When a transparent liquid is poured into the beaker, the apparent depth of the coin is found to be 40% less than the real depth. What is the refractive index of the liquid? The options for the answer are 0.4 / 0.6 / 1.2 / 1.7

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Answer:

D. 1.7

Explanation:

Refractive index can be calculated using the formula;

η =real depth/apparent depth

Assume the real depth to be-----x

Apparent depth will be : 40% less than real depth;

60/100 *x =0.6x

η = x/ 0.6 x

η = 1/0.6

η= 10/6

η = 1.66

η = 1.7

Which particle would produce a magnetic field?(1) a neutral particle moving in a straight line
(2) a neutral particle moving in a circle
(3) a stationary charged particle
(4) a moving charged particle

Answers

Answer: The correct answer is "a moving charged particle".

Explanation:

If the current flowing in the conductor then there is magnetic field around the wire which can be detected by the compass needle.

Here, the flow of charges which are negatively charged electrons produces the magnetic field. The flow of charges constitutes the electric current.

If there is no flow of the charged particles then there is no magnetic field produce. To produce magnetic field, it is necessary that charged particle must move.

From the given options, a moving charged particle would produce a magnetic field.

Therefore, the correct option is (4).

Neutral particles and stationary charged particles
don't produce magnetic fields.

Charged particles in motion do.

The initiative vs. guilt stage is an essential phase in a child’s development, where they learn to explore and take _______ while developing their sense of autonomy and control over their lives.

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The initiative vs. guilt stage is an essential phase in a child’s development, where they learn to explore and take initiative while developing their sense of autonomy and control over their lives.

The answer is initiative.

You shoot a model rocket into the air with a speed of 18.2 m/s. now high does the rocket go?

Answers

We don't know anything about the engine on the model rocket ...
how long it burns after launch, how much force it exerts, how much
impulse or acceleration it imparts to the rocket, etc.
The only thing we can do with this question is to think of the craft as
a rock instead of a rocket ... assume that after launch, there are no
forces on it except the force of gravity.

Acceleration of gravity = 9.8 m/s²
This is the amount of speed lost each second.
So the rocket continues to climb for (18.2)/(9.8) = 1.857 seconds

At the bottom, its speed is 18.2 .
At the top, its speed is zero.
Its average speed during the climb is (1/2) (18.2 + 0) = 9.2 m/s .

It climbs at an average speed of 9.2 m/s for 1.857 seconds.

It reaches the altitude of (9.2) x (1.857) = 17.09 meters above the launch pad.

from 3rd equation of motion we get
v² = u² + 2gh
as final velocity is 0 m/s ; accleration due to gravity = 9.8 m/s²
(0)²=(18.2)²+2(-9.8)(h)
0=331.24 - 19.6(h)
(-331.24) ÷ (-19.6) = h
therefore h = 16.9 meters

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