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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Answer the following statement true (T) or false (F)
Stromatolites are structures created by
a. algae. b. brachiopods. c. sea worms. d. trilobites.
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?
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