Key

Physics 223 - Quiz #3
Name:
**Circle the correct answer from the choices provided with each question. In addition, you must justify your selection of an
answer. You may show your mathematical work, provide a clear definition, or eliminate the incorrect answers. Only partial
credit will be given if a clear justification is not provided.
1.
2.
For which of the vector diagrams is it true that TI + T2 = T3?
Which of the following sets of displacements, if they were oriented any way you wish, could
not be made to yield a zero net displacement?
A 200-lb force (a simple vector) is pulling on an object, as shown. The sign of the x and y
components of the force vector are
r x (positive), y (positive).
r
x (positive), y (negative).
x (negative), y (positive).
i-
x (negative), y (negative).
Three boys each pull with the same magnitude force vector on the same object as shown. The
resultant force will be
r
zero.
to the left.
r
down.
5.
Two vectors, R and S, are known:
If vector S is subtracted from vector R, the vector T = R - S is
You throw a pebble upward as shown, with a velocity v, at an angle theta, from a roof (at point
J) h ft above the ground. If the pebble rises upward to h ft above the roof (to point K), then falls
to the ground below (to point L), its speed when it hits the ground is
between v, and 2vo.
' greater than 2vo.