Air resistance is present on a ball launched horizontally out a window, striking
ID: 1398805 • Letter: A
Question
Air resistance is present on a ball launched horizontally out a window, striking the ground ten seconds later. What will the air resistance do to the following system consisting of the spring, ball, Earth, air, and ground? which choice(s) are correct? (please explain)
Heat up the air a very small amount.
Reduce the horizontal length traveled compared to no air resistance.
Reduce final energy of system.
Reduce final impact velocity.
Decrease the thermal energy of the system
1.Heat up the air a very small amount.
2.Reduce the horizontal length traveled compared to no air resistance.
3.Reduce final energy of system.
4.Reduce final impact velocity.
5.Decrease the thermal energy of the system
Explanation / Answer
when air resistance is present , when ball is thrown from window, then it will
2) Reduce the horizontal length travelled compare to no air resistance.
and it will reduce the final impact velocity(4)
Because when there will be air resistance, then path will no longer parabolic.The projectile does not travel with constant horizontal velocity, it decelerates.
The vertical motion is now under combined influence of gravity and air friction.They work against on the way down.
Gravity works only downward direction, while air friction works against the direction of motion of object.
Hence air will reduce the horizontal velocity of ball , It will reduce the final horizontal length and final impact velocity ( which is the sum of final velocity in horizontal and vertical direction)
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