Sonic Booms: A jet flies at 1.4 times the speed of sound. What is the half-angle of the conical shock wave formed?
A. 30°
B. 36°
C. 44°
D. 46°
Answer: D
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Constant Acceleration Kinematics: A baseball is hit with a bat and, as a result, its direction is completely reversed and its speed is doubled. If the actual contact with the bat lasts 0.45 s, what is the ratio of the magnitude of the average acceleration of the ball to its original speed?
A. 6.7 s-1 B. 4.4 s-1 C. 2.2 s-1 D. 0.15 s-1
Radio telescopes image a universe much ________ in temperature than with visible light
Fill in the blank(s) with correct word
At what frequency does an object with a temperature of 1000 K radiate the most power?
A) 1.0 × 1014 Hz B) 8.0 × 1014 Hz C) 2.3 × 1012 Hz D) 6.7 × 1013 Hz E) 4.1 × 1011 Hz
The unit of electric current is the ______________
Fill in the blank(s) with correct word