Which of these animals has a quicker stride?
A) giraffe
B) horse
C) cat
D) mouse
Answer: D
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A wheel rotating about a fixed axis has a constant angular acceleration of 4.0 rad/s2. In a 4.0-s interval the wheel turns through an angle of 80 radians. Assuming the wheel started from rest, how long had it been in motion at the start of the 4.0-s interval?
A. 2.5 s B. 4.0 s C. 3.5 s D. 3.0 s E. 4.5 s
Make a prediction: If the rise in carbon dioxide concentration continues at its current pace, the concentration in the year 2050 will be about _____ parts per million.
A. 400 B. 430 C. 460 D. 510
A stone is thrown from the top of a building with an initial velocity of 20 m/s downward. The top of the building is 60 m above the ground. How much time elapses between the instant of release and the instant of impact with the ground?
A. 2.0 s B. 6.1 s C. 3.5 s D. 1.6 s E. 1.0 s
The aircraft that generates a shock wave will fly at
1) half the speed of sound. 2) exactly the speed of sound. 3) twice the speed of sound. 4) all of these. A sonic boom is produced by a missile traveling 5) near the speed of sound. 6) at the speed of sound. 7) only above the speed of sound. 8) near, at, or above the speed of sound.