Answer:
(a i - 2a j) / 2
Explanation:
a1 = a i
a2 = a j
a3 = - (i + j) (2a) = - 2a i - 2a j
a4 = (i - j) (3a) = 3a i - 3a j
Let the mass of each particle is m.
Use the formula of acceleration of centre of mass
a cm = (m1 a1 + m2 a2 + m3 a3 + m4 a4) / (m1 + m2 + m3 + m4)
a cm = (a i + aj - 2a i - 2a j + 3a i - 3a j) / 4
a cm = ( 2a i - 4a j) / 4
a cm = (a i - 2a j) / 2
If this is about simple machines the answer is: Inclined plane
The block on the table will move towards the right when the given unbalanced force act on the object. Option C is correct.
<h2>
</h2><h2>
Unbalanced Force:</h2>
When the force acting on the object is not equalized by the opposite force.
<h3>Net force: </h3>
It is defined as the vector sum of all forces acting on the object at an instance.
Where,
- net force
- Force acting on the right = 10 N
- Force acting towards left = -8 N
Put the values in the formula,
Since the net force is positive it means the move towards the right.
Therefore, the block on the table will move towards the right when the given unbalanced force act on the object.
Learn more about Unbalanced force:
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The density of ice does not affect its melting rate. Adding objects will affect the melting rate.
- A physical process called melting or fusing causes a substance to change its phase from a solid to a liquid. This happens when the solid's internal energy rises, usually as a result of heat or pressure being applied, which raises the substance's temperature to the melting point.
- The term "density" refers to an extensive quality, which means that it is independent of the substance's concentration. Every substance in the world demonstrates its distinctive density. Since it does not fluctuate, it would not affect the rate of melting. The addition of the objects could speed up the process, though, as each one generates heat that could act as the mediating force for the melting process.
To learn more about density, visit :
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<h2>
The average force acting on the ball is 58 N upwards.</h2>
Explanation:
Force is given by rate of change of momentum.
Mass of ball = 0.60 kg
Initial velocity = -6.3 m/s downwards
Final velocity = 5.3 m/s upwards
Change in momentum = 0.6 x 5.3 - 0.6 x (-6.3)
Change in momentum = 6.96 kg m/s upwards
Time taken = 0.12 s
Rate of change of momentum = Change in momentum ÷ Time
Rate of change of momentum = 6.96 ÷ 0.12
Rate of change of momentum = 58 N upwards
Force = 58 N upwards
The average force acting on the ball is 58 N upwards.