18 kilogram Mass Blokus addressed a level surface if the coefficient of static friction between the Block in the surface is 0.6
1 answer:
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The drag force is directly proportional to the square of the velocity of motion of the object. So as the speed is doubled, the magnitude of drag force will get quadrupled.
<u>Explanation: </u>
Drag force is the opposing or resisting force acting on any object by the medium in which it is moving. So in this case, you are riding a bicycle, thus the medium can be considered as air.
The formula for calculating drag force is as below:
Here, ρ is the density of the air molecules, v is the velocity or speed of the bicycle, CD is the drag coefficient and A is the area of the bicycle.
In the above equation, only the term velocity will be a varying quantity with respect to time and other quantities will remain constant throughout the single situation of riding of bicycle.
So, the equation can be,
Where ,
(constant for this whole condition)
Now given the speed of bicycle increased from v to 2v, so the initial drag force will be
After increase in speed, the final drag force will be
Thus, if the speed of the bicycle is doubled, the drag force will get increased by four times.
The initial velocity of car 1 is 20 m/s to the right
The initial velocity of car 2 is zero
The final velocity of car 2 is 10 m/s to the right
Explanation:
We can solve the problem by using the law of conservation of momentum: the total momentum of the system must be conserved before and after the collision.
Therefore, we can write:
where:
is the mass of the first car
is the initial velocity of the first car
is the final velocity of the first car (taking right as positive direction)
is the mass of the second car
is the initial velocity of the second car
is the final velocity of the second car
We also know the initial momentum of car 1, which is
And since momentum is the mass times the velocity, we find the initial velocity of car 1:
with a positive sign, since the direction is to the right.
Now we can re-arrange the previous equation and solve for v2, the final velocity of car 2:
And since the sign is positive, the direction is the same as the initial direction of car 1, so to the right.
Learn more about momentum here:
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