1) When you calculate the motion of a projectile, you make several important ass
ID: 1573091 • Letter: 1
Question
1) When you calculate the motion of a projectile, you make several important assumptions that can be experimentally verified. Which of the following is NOT one of those assumptions?
A.The horizontal component of the velocity after launch is not changing with time.
B.The time for the horizontal and vertical motion is the same.
C.The vertical component of velocity is changing only due to the influence of gravity.
D.The horizontal and vertical components of the motion can be treated as independent problems and solved simultaneously.
E.The initial total speed of the projectile depends on the launch angle.
2)With the angle of the launcher at 4545 above the horizontal, the projectile will achieve its maximum range. Which of the following sets of statements about larger or smaller angles are all true?
A.For an angle smaller than 4545 above the horizontal, the projectile has a smaller component of velocity in the vertical direction. But the component of the velocity in the horizontal direction has increased just enough to compensate, so that the horizontal range is unchanged.
B.For an angle greater than 4545 above the horizontal, the projectile will be in the air for a longer time. During that time, it will travel just as far in the horizontal direction because the component of the velocity in the horizontal direction has increased.
C.For an angle smaller than 4545 above the horizontal, the projectile will not travel as far horizontally because even though the component of the velocity in the horizontal direction has increased, the time that the projectile spends in the air has decreased.
D.For an angle greater than 4545 above the horizontal, the projectile will be in the air shorter amount of time. And during that time, it will not travel as far horizontally because the component of the velocity in the horizontal direction has decreased.
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Explanation / Answer
1 )Option e . Initial speed of throw depends on the machine used for projectile and not on throw angle .
2) option c . Time of flight is proportional to sin theta. As theta is reduced time of flight reduces . Though the horizontal component of velocity is increased but still it is not increased to that extent as the time of flight is reduced . Hence the range is less that what you get for 45 degree
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