Questions asked
Dennis Howard
Numerade educator
A baseball pitcher delivers a fast ball. During the throw, the speed of the ball increases from 0 to 30.0 m/s over a time of 0.100 seconds. The average acceleration of the baseball is ____ m/s2. a. 3.00 b. 30.0 c. 300. d. 3000 e. none of these
Ten seconds after being dropped from rest, a free-falling object will be moving with a speed of ____. a. about 10 m/s. b. about 50 m/s. c. about 100 m/s. d. more than 100 m/s.
A speedometer is placed upon a free-falling object in order to measure its instantaneous speed during the course of its fall. Its speed reading (neglecting air resistance) would increase each second by ____. a. about 5 m/s b. about 10 m/s c. about 15 m/s d. a variable amount e. depends on its initial speed.
As an object freely falls, its ____. a. speed increases b. acceleration increases c. both of these d. none of these
What is the acceleration of a car that maintains a constant velocity of 55 mi/hr for 10.0 seconds? a. 0 b. 5.5 mi /hr/s c. 5.5 mi /s/s d. 550 mi/hr/s
The average speed of an object which moves 10 kilometers (km) in 30 minutes is ____. a. 10 km/hr b. 20 km/hr c. 30 km/hr d. more than 30 km/hr
Which one of the following statements is NOT true of a free-falling object? An object in a state of free fall ____. A) falls with a constant speed of -10 m/s. B) falls with a acceleration of -10 m/s/s. C) falls under the sole influence of gravity. D) falls with downward acceleration which has a constant magnitude.
Which one of the following quantities is NOT a speed? a. 10 mi/hr b. 10 mi/hr/sec c. 35 m/s d. 20 m/s
Which one of the following quantities is NOT a vector? a. 10 mi/hr, east b. 10 mi/hr/sec, west c. 35 m/s, north d. 20 m/s
If an object is moving eastward and slowing down, then the direction of its velocity vector is ____. a. eastward b. westward c. neither d. not enough info to tell