Answer:
Explanation:
<u>Work
</u>
The work done by an external force F when moving an object by a distance X parallel to its direction is
The second Newton's law gives us the net force acting on an object of mass m which is being moved at an acceleration a:
Replacing the last equation into the first equation
And solving for a
There seems to be some kind of mistake in the data provided, we'll use it anyway
It's a very small value as compared to the dimensions of the rest of the problem.
Answer:
All the hairs on the child's head must gain the same type of charge. Like charges repel so the strands of hair experience a force that pushes them away from each other.
Explanation:
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ANS: The correct answer to the question is coefficient of friction.
EXPLANATION:
Let us consider a body resting on a table. The weight of the body is acting in vertical downward direction. The table also exerts an equal amount of force perpendicular to the surface of the body which is called normal reaction.
Here, normal reaction [N] = Weight [W]
Let an external force is applied on the body which will cause motion on the body. As the body is resting on the floor, friction will come into existence which will oppose the relative motion between table and body.
Let F is the force of friction.
The force of friction is directly proportional to the normal reaction. Mathematically we may write F ∝ N
Here, is a proportionality constant called the coefficient of friction.
⇒ [∵N= W]
From above, it is obvious that coefficient of friction is a unitless quantity.
Hence, the amount of friction divided by the weight of an object forms a unitless number called the coefficient of friction.
Explanation:
FROM THE WEB
The quantity of force is expressed by the vector product of mass (m) and acceleration (a). The equation or the formula for force can mathematically be expressed in the form of: F = ma.