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ddd [48]
3 years ago
7

At the moment the acceleration of the blue ball is 9.40 m/s2, what is the ratio of the magnitudes of the force of air resistance

to the force of gravity acting on the blue ball? use 9.81 m/s2 for the standard value of g at the location of the experiment.
Physics
1 answer:
timurjin [86]3 years ago
5 0
Let us see. We have that Newton's Law holds in this case, so \sum{F}=m*a where a is the acceleration of the ball, F the forces acting on it and m its mass. There are 2 forces acting on it, the force of gravity W and air resistance R. We can easily see that these two act in opposite directions (gravity towards the ground, resistance upwards), so |ΣF|=W-R (1) . We have that W=m*g where <span>g=9.81 m/s2. We also have that ΣF=9.40*m. From this relationship, substituting into (1) all the known values, we get that R=m(9.81*-9.40)=m*0,41. We take then the ratio R/W. This is equal to:\frac{0.41 m }{9.81m} =0.042=4.2\%. This is our final answer.
</span>
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k = 88.7 N/m is the spring constant

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The complete question is -

A 2000 kg truck is moving eastward at 25 m/s. it collides inelastically with a 1500 kg truck traveling southward at 30 m/s. they collide at the intersection. Find the direction and magnitude of velocity of the wreckage after the collision, assuming the vehicles stick together after the collision.

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