What happened at 10-33 seconds when quarks could bind together for the first time?
A: the universe became transparent
B: the expansion of the universe began
C: helium formed
D: protons and neutrons formed
E: atoms formed
Ans: D: protons and neutrons formed
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If you mix a typical aluminum ion (Al, atomic no. = 13) with a typical oxygen ion (O, atomic no. = 8), what compound is formed?
A) Al2O3 B) Al3O2 C) Al13O8 D) Al3O E) Al2O2
When a particular capacitor is connected to a source of sinusoidally varying emf with constant amplitude and a frequency of 60.0 Hz, the rms current is 3.00 A. What is the rms current if the source frequency is doubled?
1.12.0 A 2.6.00 A 3.4.24 A 4.3.00 A 5.1.50 A
Which of the five major divisions of chemistry deals exclusively with carbon compounds?
a. Physical chemistry b. Inorganic chemistry c. Analytical chemistry d. Organic chemistry e. Biochemistry
The phase angle of an LRC series circuit with an inductive reactance of 200 ? and a capacitive reactance of 100 ? is 40.0°. What is the value of the resistor in this circuit?
A) 200 ? B) 119 ? C) 265 ? D) 156 ? E) 100 ?