An experiment to measure the speed of light uses an apparatus similar to Fizeau's. The distance between the light source and the mirror is 10 m, and the wheel has 800 notches. If the wheel rotates at 9000 rev/s when the light from the source is extinguished, what is the experimental value for c (in m/s)?
a. 2.94 × 10^8
b. 2.92 × 10^8
c. 2.88 × 10^8
d. 2.98 × 10^8
e. 3.01 × 10^8
c
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A uniform 135-g meter stick rotates about an axis perpendicular to the stick passing through its center with an angular speed of 3.50 rad/s. What is the magnitude of the angular momentum of the stick?
A) 0.0739 kg ? m2/s B) 0.0394 kg ? m2/s C) 0.158 kg ? m2/s D) 0.0236 kg ? m2/s E) 0.473 kg ? m2/s
A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km. At the bottom of the dive, the pilot has a speed of 0.20 km/s which at that instant is not changing. What force does the plane exert on the pilot?
a. 3.6 kN up b. 4.3 kN up c. 2.9 kN down d. 2.9 kN up e. 5.8 kN down
Which of the following regions was the result of plumes of hot mantle rising in a hot spot within a plate?
A) Alaska's Aleutian Islands B) Japan and the Philippines C) the islands of Hawaii D) the volcano Mount St. Helens E) all of the above
You stand by the railroad tracks as a train passes by. You hear a 1 020-Hz frequency when the train approaches, which changes to 760 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s
a. 30.2 m/s b. 34.5 m/s c. 40.1 m/s d. 49.7 m/s e. 45.6 m/s