A plano-convex lens is to have a focal length of 40 cm. It is made of glass of index of refraction 1.65. What radius of curvature is required?
A) 36. cm
B) 26. cm
C) 13. cm
D) 32. cm
E) 44. cm
B
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A 30-kg child rides on a circus Ferris wheel that takes her around a vertical circular path with a radius of 20 m every 22 s. What is the magnitude of the resultant force on the child at the highest point on this trajectory?
a. 49 N b. 0.29 kN c. 0.34 kN d. 0.25 kN e. 0.76 kN
How long does it take an M-type star to reach the main sequence, compared to a solar-type star?
A) longer than the age of the Galaxy B) about twice as long C) a tenth as long D) about twenty times longer E) about the same, 30 million years
A(n) ____________________ periodically emits large amounts of X-ray radiation as material accretes around a neutron star or black hole
Fill in the blank(s) with correct word
Determine the number of magnetic quantum numbers that correspond to l = 4
a. 8 b. 7 c. 18 d. 5 e. 9