An airplane flying faster than the speed of sound of 340 m/s produces a shock wave that makes an angle of 50° with the direction the plane is flying. What is the speed of the plane?
A) 490 m/s
B) 530 m/s
C) 390 m/s
D) 440 m/s
E) 405 m/s
D
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Answer the following statement true (T) or false (F)
What is supercritical reaction?
a. A reaction in a nuclear reactor that is about to fail because of fuel depletion. b. A chain reaction that would simply die out because not enough neutrons are being absorbed by uranium-235. c. A chain reaction that grows rapidly because an average of more than one neutron from each fission reaction causes another fission reaction. d. A chain reaction based on plutonium. e. One that can continue indefinitely.
As air rises, it
A) compresses and warms. B) compresses and cools. C) expands and warms. D) expands and cools.
A rock is thrown straight up with an initial velocity of 30.0 m/s.What maximum height will the rock reach before starting to fall downward? (Acceleration due to gravity is 9.80 m/s2.)
a. 9.80 m c. 20.4 m b. 19.6 m d. 45.9 m