Identify a true statement about main-sequence stars
A) They balance their gravity by fusing hydrogen.
B) They generate energy by breaking uranium isotopes.
C) They do not increase in size as they consume their fuel.
D) They do not undergo any molecular change during their life spans.
A
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Thin Lenses: A 4.0-cm tall apple is 20 cm in front of a plano-convex lens of focal length 75 cm.(a) Find the location of the image of the apple. Is it a real or a virtual image?(b) How tall is the image of the apple? Is it upright or inverted?
What will be an ideal response?
The pressure relief valve is opened on a thin-walled cylindrical tank, with the radius-to-wall thickness ratio of 128, thereby decreasing the lon-gitudinal strain by 150 3 1026. Assume E 5 73 GPa and ? 5 0.33. The original internal pressure in the tank was approximately:
(A) 370 kPa
(B) 450 kPa
(C) 500 kPa
(D) 590 kPa
The fundamental frequency of a violin string is 440 hertz. The frequency of its second harmonic is
A) 220 hertz. B) 440 hertz. C) 880 hertz. D) none of the above
Light of wavelength 540 nm is incident on a slit of width 0.150 mm, and a diffraction pattern is produced on a screen that is 3.00 m from the slit. What is the width of the central bright fringe? (1 nm = 10-9 m)
a. 1.44 cm c. 2.16 cm b. 0.720 cm d. 1.76 cm