Einstein's general theory of relativity suggests that gravity is
A) caused by curvature of spacetime.
B) a force of attraction that acts at a distance between two masses.
C) F = G(M1M2) /d2.
D) one of four fundamental forces in nature.
A) caused by curvature of spacetime.
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For a person with normal vision (near point 25 cm, far point infinity), the maximum angular magnification for a lens is 4.00. If this same lens is used with the relaxed eye, what angular magnification would result?
1.The focal length must be given to figure this out. 2.5.00 3.3.50 4.3.00
A metal has a work function of 4.50 eV. Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal. (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 0.00 eV B) 0.37 eV C) 0.47 eV D) 0.53 eV
A star is in an elliptical orbit around a black hole (which can't be seen). You have been observing the motion of the star through a telescope and have followed the motion long enough to establish that it is elliptical
How can you determine on which focus of the ellipse the black hole is located?
What is the critical angle?
a. The angle of incidence below which total internal reflection takes place. b. The smallest angle of incidence that is greater than its angle of reflection. c. The angle of incidence above which total internal reflection takes place. d. The angle of incidence that equals its angle of refraction. e. The angle at which light enters a new material.