At the end of the first fifteen minutes, the mass ratio of H/He created was about
A) 50/50.
B) 75/25.
C) 27/73.
D) 90/10.
E) 1/4.
B
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Which one of the following is TRUE?
A. Irregular galaxies rarely have star formation taking place in them. B. Most galaxies appear to be approaching the Milky Way Galaxy. C. Most elliptical galaxies contain only young stars. D. Smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the Milky Way. E. Galaxy collisions destroy most of the stars in the galaxies involved.
When voltage is stepped up in a transformer, current is stepped down. But Ohm's law tells us that greater voltage means greater current, not less current. How then can current be lower when voltage is increased?
A) Current in the secondary is lower when compared to the greater current drawn by the primary. B) Ohm's law applies to the circuit connected to the secondary, not to the transformer. C) both of these D) neither of these
In order, from top to bottom, in the activity series come K, Zn, Pb, H, Cu, and Au. Therefore,
a. adding Pb to ZnCl2 will release Zn. b. adding Cu to HCl will release hydrogen. c. adding Au to HCl will release hydrogen. d. adding Cu to AuCl3 will release Au.
A wheel rotating about a fixed axis has a constant angular acceleration of 4.0 rad/s2 . In a 4.0-s interval the wheel turns through an angle of 80 radians. Assuming the wheel started from rest, how long had it been in motion at the start of the 4.0-s interval?
a. 2.5 s b. 4.0 s c. 3.5 s d. 3.0 s e. 4.5 s