Question

Dyne-second stands for the unit of(A) force (B) momentum(C) energy (D) power

Answer 1

Momentum=mv
F=ma
m=F/a
v=at
Therefore we get
Momentum=F/a*at=Ft
Comparing the units we get
Dyne second

Answer 2

The correct answer to the question is (B) Momentum

EXPLANATION:

The unit is given as dyne-second.

We are asked to determine the physical quantity.

dyne is the unit of force and second is the unit of time.

Hence, the physical quantity is the product of force with time.

From Newton's second law of motion, we know that rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

Let the change in momentum is dP.

Mathematically $F=\ \frac{dP}{dt}$

                          $dP=\ F\times dt$

From above, it is obvious that change in momentum dP is the product of force with time.

Hence, change in momentum has the unit  of dyne-second.