The air drag is a force that depends on the speed of an object relative to the wind. Under certain conditions, it can be modeled as:
Where b is a constant.
As a falling object reaches a speed so that its weight is cancelled out by the air drag, the object will reach a maximum velocity.
In a speed vs time gaph, the speed would approach the maximum speed like an asymptote.
On the other hand, since the object falls from rest, the initial speed on the graph must be zero.
Taking these considerations into account, the correct graph for the movement of an object that falls from rest if air drag is not ignored, is option B.
(B) All objects attract other objects
To be specific, the following formula defines this theory very clearly:
F = G * (m1 * m2) / r^2
The Force is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Answer:
30 C
Explanation:
Given:
Current flowing in the circuit (I) = 50 A
Start-up time (t) = 0.60 s
Now, we know that, charge drawn in through a cross sectional area of the circuit is given as:
Where, 'q' is the amount of charge drawn, 'I' is the current and 't' is the start-up time.
Now, plug in 50 A for 'I', 0.60 s for 't' and solve for 'q'. This gives,
Therefore, the amount of charge drawn in the circuit at the start-up of the compressor of an air conditioner is 30 C.
Answer:
E. The force on A is exactly equal to the force on B.
Explanation:
The force between two charges is given by
where
= Charge on particle 1
= Charge on particle 2
r = Distance between the charges
k = Coulomb constant = 
This force will be exerted on both the charges equally.
So, The force on A is exactly equal to the force on B
Answer:
Mars venus earth and Mercury are inner planets
Jupiter , Saturn , Uranus and Neptune are outer.
