How much time is needed for a 15,000 W engine to do 1,800,000 J of work? (Power: P = W/t)
A. 0.008 s
B. 8 s
C. 120 s
D. 1,785,000 s

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Frequency of electromagnetic waves that a radio station is assigned is called

The path of a satellite orbiting the earth causes it to pass directly over two tracking stations a and b, which are 51 miles apart. when the satellite is on one side of the two stations, the angles of elevation at a and b are measured to be 87 degrees and 84 degrees, respectively. (a) how far is the satellite from station a? (b) how high is the satellite above the ground?