An airplane is pointed in the NE direction and is moving 71. m/s with respect to the air. The jetstream (moving air) carries the plane 30. m/s toward the East. What is the velocity of the plane relative to the ground?
What will be an ideal response?
94. m/s at 32.°
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Power: A 120-V rms voltage at 60.0 Hz is applied across a capacitor and a 100-? resistor. If the impedance of this circuit is 200 ?, what is the average power of this circuit?
A. 278 W B. 72.0 W C. 36.0 W D. 100 W E. 200 W
What source of energy might keep water beneath the surface of Enceladus liquid?
A) tidal heating only B) radioactive decay only C) tidal heating and radioactive decay D) heat released from a partially molten core
Seafloor spreading on the Earth is the process by which
A) volcanic material flows from the deep interior to produce volcanic islands B) dense material sank while lighter material rose to the surface during the early geological history C) molten lava oozes out between two tectonic plates that are slowly moving apart D) oceanic crust sinks below continental crust at a tectonic plate boundary
A point source emits sound waves with a power output of 100 watts. What is the sound level (in dB) at a distance of 10 m?
a. 139 b. 119 c. 129 d. 109 e. 10