If a plane is flying at a speed so that the apex half-angle of its shockwave is 30°, what is its speed if the speed of sound is 320 m/s?
a. 960 m/s
b. 640 m/s
c. 320 m/s
d. 160 m/s
e. Choose this answer if a shock wave cannot form in this situation.
b
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Motions of objects near our Galaxy's core suggest the central black hole is about 3.7 billion solar masses
Indicate whether the statement is true or false
An insulated wire of diameter 1.0 mm and negligible resistance is wrapped tightly around a cylindrical core of radius 5.0 cm and length 30 cm to build a solenoid
What is the energy stored in this solenoid when a current I = 0.20 A flows through it? (?0 = 4? × 10-7 T ? m/A) A) 1.2 × 10-4 J B) 9.6 × 10-4 J C) 4.8 × 10-4 J D) 2.4 × 10-4 J E) 5.9 × 10-5 J
The waveform of interfering waves is described by the principle of ______________
Fill in the blank(s) with correct word
There is no current in the circuit shown in the figure below until the switch is closed. The current through the 20-? resistor the instant after the switch is closed is either [1] 15 A or [2] 5.0 A, and the current through the 20-? resistor after the switch has been closed a long time is either [3] 5.0 A or [4] 15 A. Which combination of the above choices is correct?
a.
[1] and [3]
b.
[1] and [4]
c.
[2] and [3]
d.
[2] and [4]
e.
None of these