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A raindrop m 3.35 x 10-5 kg falls vertically at constant speed under the forces of gravity and air resistance In falling through 100 m what is the work done by a gravity and b air resistance?
Wiki User
∙ 15y ago
Here given, Mass of raindrop (m)= 3.35 X 10^-5 kg Height (h)= 100 m Mass of earth (M)= 6 X 10^24 kg Radius of earth (R)= 6371000 m Universal gravitational constant (G) = 6.67 X 10^-11 Nm^2kg^-2 [Neglecting air resistance as its value is not given] We have, Work done = Force(F) X Distance(h) = (GMm)/R^2 = [6.67 X 10^(-11) X 3.35 X 10^(-5) X 6 X 10^24] / (6371000)^2 = 3.30 X 10^-2 Joule Hence, the work done by gravity is 3.30 X 10^-2 Joules. Ans
Wiki User
∙ 15y ago
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What type of force acts on a raindrop to reduce its speed?
Air resistance. The viscosity (resistance to flow) of the atmosphere slow down falling raindrops.
Why a raindrop falling vertically through still air reaches a constant velocity?
The air resistance will increase to the point where it counters the downward acceleration.
What is terminal motion?
the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration.
Which encounters the greater force of air resistance a falling elephant or a falling feather?
A falling elephant encounters a greater force of air resistance than a falling feather does. The force of air resistance can't be greater than the weight of the falling object. When the force of air resistance is equal to the weight of the falling object, the object stops accelerating, its falling speed becomes constant, and the force of air resistance doesn't get any bigger. So the force of air resistance against a falling feather can't be greater than the weight of the feather. But the force of air resistance against a falling elephant can be, and undoubtedly is, greater than the weight of a feather.
Why does the front wind screen of a moving car get wet when rain is falling vertically downward?
-- A raindrop takes some time to fall through a distance equal to the height of the windscreen. -- In that length of time, the car moves some distance forward. -- Any raindrop that is directly in front of the windscreen, but nearer to it than the distance the car will move before the raindrop falls past the bottom of the windscreen, will splat against the windscreen as its fall is interrupted.
What type of force acts on a raindrop to reduce its speed?
Air resistance. The viscosity (resistance to flow) of the atmosphere slow down falling raindrops.
Why a raindrop falling vertically through still air reaches a constant velocity?
The air resistance will increase to the point where it counters the downward acceleration.
When air resistance balances the weight of an object that is falling the velocity remains blank?
Constant
What is terminal motion?
the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration.
Which encounters the greater force of air resistance a falling elephant or a falling feather?
A falling elephant encounters a greater force of air resistance than a falling feather does. The force of air resistance can't be greater than the weight of the falling object. When the force of air resistance is equal to the weight of the falling object, the object stops accelerating, its falling speed becomes constant, and the force of air resistance doesn't get any bigger. So the force of air resistance against a falling feather can't be greater than the weight of the feather. But the force of air resistance against a falling elephant can be, and undoubtedly is, greater than the weight of a feather.
What would you call it when air resistance the force of gravity and a falling object stops accelerating?
When a falling object stops accelerating but is falling at a constant velocity, it is called terminal velocity.
What is the direction and magnitude of the net force acting on a rain drop falling down with constant speed?
If the raindrop is falling at a constant speed, then it has reached terminal velocity. This happens when the downward force (due to gravity) is the same as the upward force due to friction. As such the net force acting on the rain drop is 0.
If you were a raindrop falling from the sky what would you do?
i would aim for some one
What did the witty raindrop exclaim to others?
"I'm just falling for you all!"
Why does the front wind screen of a moving car get wet when rain is falling vertically downward?
-- A raindrop takes some time to fall through a distance equal to the height of the windscreen. -- In that length of time, the car moves some distance forward. -- Any raindrop that is directly in front of the windscreen, but nearer to it than the distance the car will move before the raindrop falls past the bottom of the windscreen, will splat against the windscreen as its fall is interrupted.
Can returning radar energy show the direction and speed of a falling raindrop?
yes
When a raindrop falls from clouds then as the gravitional force is counterbalanced by the viscous force of the air so it should not fall. But how it is falling?
You are wrong at this point. When the raindrop starts to fall, its weight is the only force acting on it. When it starts to accelerate due to this force, the drag force, or air resistance, becomes significant. The magnitude of the drag force will increase as it continues to accelerate, until it equals the magnitude of the weight. At this point, net force will be zero. However, according to Newton's first law, the object should continue to drop, but with constant speed. You are wrong in the belief that the magnitude of the air resistance is equal to the weight since the beginning. This is not the case. Instead, the magnitude of air resistance was zero when the raindrop starts to fall, but increases as it accelerates until it equals the weight. At this point, the drag force will no longer increase as the rain drop does not accelerate anymore.
