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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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
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
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