Gilfoil Test (some answers)
An object is moving with constant non-zero velocity in the +x direction. The position versus time graph of this object is
a straight line making an angle with the time axis.
An airplane needs to reach a forward velocity of 203.0 km/h to take off. One a 2000-m runway, what is the minimum uniform acceleration necessary for the plane to take flight if it starts from rest?
0.79 m/s^2
A confused dragonfly flies forward and backward in a straight line. Its motion is shown on the following graph of horizontal position vs. time t. What is the average velocity of the dragonfly for the time interval from t = 0 s to t = 8 s?
0 m/s
A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average velocity?
0 m/s
If a car is traveling at an average speed of 60 kilometers per hour, how long does it take to travel 12 kilometers?
0.2 hour
A monkey climbs vertically on a vine. Its motion is shown on the following graph of vertical position vs. time What is the instantaneous speed of the monkey at time t = 8 s?
1.5 m/s
The data table above lists the position of an object over a 6 second interval. What was the the average velocity of the object during this time period?
1.7 m/s
A runner completed the 100.-meter dash in 10.0 seconds. His average speed was
10.0 m/s
A water rocket can reach a speed of 75 m/s in 0.050 seconds from launch. What is its average acceleration? (in units of m/s2)
1500 m/s^2
Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. How long does it take for them to meet? (in seconds)
20 seconds
In a drill during basketball practice, a player runs the length of the 30 meter court and back. The player does this three times in 60 seconds. The average speed of the player during the drill is
3.0 m/s
A baseball player runs 27.4 meters from the batter's box to first base, overruns first base by 3.0 meters, and then returns to first base. Compared to the total distance traveled by the player, the magnitude of the player's total displacement from the batter's box is
6.0 m shorter
Car A, moving in a straight line at a constant speed of 20. meters per second, is initially 200 meters behind car B, moving in the same straight line at a constant speed of 15 meters per second. How far must car A travel from this initial position before it catches up with car B?
800 m
An object is moving with constant non-zero acceleration in the +x direction. The velocity versus time graph of this object is
a straight line making an angle with the time axis.
Under what condition is average velocity equal to the average of the object's initial and final velocity?
The acceleration is constant
Suppose that an object travels from one point in space to another. Make a comparison between the magnitude of the displacement and the distance traveled by this object
The displacement is either less than or equal to the distance traveled.
An object is moving with constant non-zero velocity in the +x direction. The velocity versus time graph of this object is
a horizontal straight line
If the acceleration of an object is zero, then that object cannot be moving
false
Consider a deer that runs from point A to point B. The distance the deer runs can be greater than the magnitude of its displacement, but the magnitude of the displacement can never be greater than the distance it runs.
true
