The visible surface of the Sun is composed of solid matter
a. True
b. False
Indicate whether the statement is true or false
False
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An enclosed chamber with sound absorbing walls has a 2.0 m × 1.0 m opening for an outside window. A loudspeaker is located outdoors, 84 m away and facing the window
The intensity level of the sound entering the window space from the loudspeaker is 56 dB. Assume the acoustic output of the loudspeaker is uniform in all directions and that acoustic energy incident upon the ground is completely absorbed and therefore is not reflected into the window. The threshold of hearing is 1.0 × 10-12 W/m2. The acoustic power output of the loudspeaker is closest to A) 0.035 W. B) 0.070 W. C) 0.18 W. D) 0.35 W. E) 0.70 W.
The critical angle for a substance in air is measured at 53.7°. If light enters this substance from air at 45.0° with the normal, at what angle with the normal will it continue to travel?
A) 34.7° B) 53.7° C) 45.0° D) It will not continue, but will be totally reflected.
Which of the following expressions gives the correct units for the volt in terms of base SI units?
A. 1 V = 1 kg·m2C–1s B. 1 V = 1 kg·m2A–1s–3 C. 1 V = 1 kg·m·A–1s–1 D. 1 V = 1 kg·m2s–2C–2 E. 1 V = 1 J/C F. Some other expression (specify).
Three point charges are placed on the x-axis. A charge of +2.0 ?C is placed at the origin, -2.0 ?C to the right at x = 50 cm, and +4.0 ?C at the 100 cm mark
What are the magnitude and direction of the electrostatic force which acts on the charge at the origin?