The universe was two minutes old when ________ started to form from deuterium fusion
Fill in the blank(s) with correct word
helium
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A particle with charge 2?C is placed at the origin. An identical particle, with the same charge, is placed 2 m from the origin on the x axis, and a third identical particle, with the same charge, is placed 2 m from the origin on the y axis. The magnitude of the force on the particle at the origin is:
A) 9.0 × 10-3 N B) 6.4 × 10-3 N C) 1.3 × 10-2 N D) 1.8 × 10-2 N E) 3.6 × 10-2 N
Four waves are described by the following equations, where distances are measured in meters and times in seconds
I. y = 0.12 cos(3x - 21t) II. y = 0.15 sin(6x + 42t) III. y = 0.13 cos(6x + 21t) IV. y = -0.23 sin(3x - 42t) Which of these waves have the same speed? A) I and II B) I and III C) II and III D) III and IV E) II and IV
An 80.0 kg person is riding in an elevator that is accelerating at 2.40 
downward. The apparent weight of the 80.0 kg person measured on a scale in the elevator
A. 592 N. B. 639 N. C. 784 N. D. 855 N. E. 976 N.
Which type of asteroid is classified to be dark as coal and probably carbonaceous?
a. C-type b. F-type c. M-type d. S-type e. V-type