A semicircular piece of glass has a beam of light entering the curved surface from air and then striking the flat surface at an angle of incident ?. What is the critical angle in the glass if the glass has an index of refraction 1.50 or 3/2?
3
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The luminosity of the white dwarf supernova 175 days after it reaches peak brightness is about ________ of its luminosity at peak brightness.
A) 30% B) 10% C) 3% D) 1%
A Jurassic dinosaur is approaching your vehicle and appears in the side-view mirror. It is larger than it appears in the mirror. This means that
A. its image size is smaller than what the flat rearview mirror shows. B. it is inverted and real. C. its image size is larger than what the flat rearview mirror shows. D. it is a virtual image and inverted.
Earth orbits the Sun _____
A) once a year B) twice a year C) three times a year D) four times a year
A box of mass m is pulled with a constant acceleration a along a horizontal frictionless floor by a wire that makes an angle of 15° above the horizontal. If T is the tension in this wire, then
A) T = ma. B) T > ma. C) T < ma.