Can I get a direct answer please??
1 answer:
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Answer:
<em>The object with the twice the area of the other object, will have the larger drag coefficient.</em>
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Explanation:
The equation for drag force is given as
where IS the drag force on the object
p = density of the fluid through which the object moves
u = relative velocity of the object through the fluid
p = density of the fluid
= coefficient of drag
A = area of the object
Note that is a dimensionless coefficient related to the object's geometry and taking into account both skin friction and form drag. The most interesting things is that it is dependent on the linear dimension, which means that it will vary directly with the change in diameter of the fluid
The above equation can also be broken down as
∝
A
where is the pressure exerted by the fluid on the area A
Also note that =
which also clarifies that the drag force is approximately proportional to the abject's area.
<em>In this case, the object with the twice the area of the other object, will have the larger drag coefficient.</em>
Given parameters:
Acceleration of the car = 1.6m/s
Initial speed = 80km/hr
Final speed = 110km/hr
Solution:
Time taken to achieve this speed = ?
Solution:
Acceleration is the rate of change of velocity with the time taken.
Mathematically;
a =
where a is the acceleration
V is the final velocity
U is the initial velocity
T is the time taken
Now make the unknown time the subject of the expression;
aT = V - U
T =
Convert the given acceleration to km/hr;
1.6m/s = 1.6 x x
x
= 5.76km/hr
Input the parameters and solve;
T = = 5.2hrs
The time taken is 5.2hrs