The Cenozoic era consists of only two periods: the ______________ and the Quaternary
Fill in the blank(s) with correct word
Tertiary
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A white dwarf star is prevented from collapsing by
a. nuclear energy it is generating. b. its gravitational force. c. Hubble's law of extragalactic redshifts. d. degenerate electron gas pressure. e. degenerate astronomers observing the star.
The mass in the figure slides on a frictionless surface. If m = 2 kg, k1 = 800 N/m and k2 = 500 N/m, the frequency of oscillation (in Hz) is approximately
?
?
A. 6. B. 2. C. 4. D. 8. E. 10.
Velocity: A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average speed?
A. 2.5 m/s B. 5.0 m/s C. 10 m/s D. 0 m/s E. 1.3 m/s
Spherical Mirrors: A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?
A. 20 cm B. 15 cm C. 7.5 cm D. 5.0 cm