How is intelligence defined in the Drake Equation?
A) a civilization that has developed language
B) a civilization willing and able to communicate over interstellar distances
C) a civilization that communicates using telepathy
D) a civilization capable of spaceflight
B
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Which moon of Saturn has the surface with the widest range of ages? Why?
What will be an ideal response?
An umbrella tends to jerk upward on a windy day principally because
A) air gets trapped under the umbrella, which warms, and rises. B) buoyancy increases with increasing wind speed. C) air pressure is reduced over the curved top surface. D) all of the above
A jet engine develops 1.50 × 10^5 N of thrust in moving an airplane forward at a speed of 900 km/h. What is the power developed by the engine?
a. 1 350 kW b. 380 MW c. 37.5 MW d. 42.5 MW e. 32.5 MW
A loop of wire is oriented in the magnetic field as shown (the plane of the loop is perpendicular to the direction of the magnetic field and the magnetic field strength increases with height). Which of the following is true? 
A. There will be an induced current only if the loop is moved to the right B. There will be an induced current only if the loop is moved to the left C. There will be an induced current only if the loop is moved upward D. There will be an induced current if the loop is moved either up or down E. There will be an induced current only if the loop is moved downward