A jet fighter plane is launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2 s. Assuming the acceleration is constant, what is the length of the catapult?
A) 16 m
B) 42 m
C) 24 m
D) 66 m
E) 84 m
B
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Compact fluorescent bulbs cost $10 per bulb and last 10 years. Tungsten bulbs cost $0.50 per bulb and last 1 year
For a given amount of light, a tungsten bulb draws 75 W and a compact fluorescent bulb draws 10 W. If the cost of electricity is $0.10/kWh and the bulbs are operated for 2000 h/yr, what amount of money is saved by use of a compact fluorescent instead of a tungsten bulb over a 20-year period?
Repetitive sounds can be soothing to frequent website visitors, so use them liberally.
Answer the following statement true (T) or false (F)
An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 1 000 m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change?
a. 0.25 b. 0.50 c. 1.00 d. 2.00 e. 4.00
Stromatolites are structures created by
a. algae. b. brachiopods. c. sea worms. d. trilobites.