Which of the following measurements is a scalar quantity?
a. the tension in an elevator cable
b. the acceleration of a car along a test track
c. the instantaneous velocity of a parachutist in free fall
d. the displacement of a hiker from her base station
e. the measured distance between Toronto and Montreal
2. Two hikers set out from the same spot and arrive at the same destination but they take different routes. Which of the following quantities must be the same for both hikers?
a. distance
b. displacement
c. average speed
d. average velocity
e. acceleration
3. An object is traveling north and slowing down. The directions associated with the object's velocity and acceleration, respectively, are
a. [N], [S]
b. [N], [N]
c. [S], [S]
d. [N], [N]
e. [N], [S]
4. An object is traveling due east when it experiences a uniform acceleration directed north. Its velocity some time later
a. must be directed north
b. could be directed north
c. must be directed northeast
d. could be directed east when the acceleration ceases
e. must be directed east when the acceleration ceases
5. Ignoring air resistance, which of the following are exhibiting "free fall"?
a. an object, initially at rest, dropped out of a window
b. an object thrown vertically downward from a window
c. an object projected vertically upward from a window
d. an object thrown horizontally from a window
e. all of the above