An object 4 cm high is placed 15 cm in front of a convex mirror with a focal length of ?10 cm. What is the image position (in cm)?
a. ?8
b. ?4
c. ?2
d. ?6
e. 30
d
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This painting shows a futuristic spacecraft powered by the detonation of small hydrogen bombs. If we actually had such a spacecraft, what would it allow us to do?
A) It would allow us to make a one-way trip to the nearest star besides the Sun in about a century. B) It would allow us to travel roundtrip to almost anywhere in the Milky Way Galaxy in just a few years of ship time. C) It would allow us to travel from Earth to Mars in less than an hour. D) It would allow us to travel up to several times faster than the speed of light.
What is the angular separation of the two second-order spectral lines having wavelengths 417 nm and 388 nm using a diffraction grating having 456 lines/mm?
A) 1.63° B) 1.52° C) 0.815° D) 3.26°
Two displacement vectors have magnitudes of 5 m and 7 m, respectively. When these two vectors are added, the magnitude of the sum
A) is exactly 2 m. B) could be as small as 2 m, or as large as 12 m. C) is exactly 12 m. D) is larger than 12 m. E) is exactly 6 m.
A satellite is in a circular orbit 600 km above the Earth's surface. The acceleration of gravity is 8.21 m/s2 at this altitude. The radius of the Earth is 6400 km. Determine the speed of the satellite, and the time to complete one orbit around the Earth