Hi I have two questions about two dimensional motions confusing me: 1.In two dim
ID: 2143880 • Letter: H
Question
Hi I have two questions about two dimensional motions confusing me:
1.In two dimensional motion, what is the SAME factor in both directions?
a. velocityb. acceleration
c. displacement
d. time
e. none of above
2.A gun is held horizontally and fired. At the same time the bullet leaves the gun's barrel an identical bullet is dropped from the same height. Neglect air resistance,
Which bullet will hit the ground first? Choose one answer. a. The bullet that was fired
b. The bullet that was dropped
c. Hard to tell
d. None of above
e. It is a tie
I don't know if my teacher wants me know which will fall faster or what? So could someone help me on this? thanks.
Explanation / Answer
the time, t, is the only thing that doesn't involve an x or a y. This is because everything else is a vector (or a component of a vector, if you'd rather look at it that way), but time is a scalar. Time is the one thing that can be used directly in both the x and y equations; everything else (displacement, velocity, and acceleration) has to be split into components.
e) Its a TIE..
The vertical component of the speed is the same, so it is necessarily a tie
but also remember that....
{This answer is incorrect. Because of the curvature of the Earth, the bullet that was dropped will hit first. The one fired from the gun has a greater distance to fall. If the bullet that was fired was moving fast enough, it would never hit the ground at all. }