The atomic number and mass number for calcium-39 are 20 and 39, respectively. How many neutrons are in one atom?
A) 1
B) 19
C) 20
D) 39
E) 59
B
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The inductor in an LR circuit initially carries a current I0 and therefore contains a certain amount of energy in its magnetic field. By the time that the current has decayed to half its initial value, what fraction of the inductor’s magnetic field energy has been converted to thermal energy in the circuit’s resistor?
A. 7/8
B. 3/4
C. 1/2
D. 1/4
E. 1/8
F. Some other fraction (specify).
Brown dwarfs, white dwarfs, and neutrons stars are all kept from collapsing by degeneracy pressure
Indicate whether the statement is true or false
What does the IUPAC organization do with
regard to organic chemistry? a) predicts new synthetic hydrocarbon structures b) provides rules for naming complex organic compounds c) helps convert unsaturated hydrocarbons into saturated ones d) tests drugs to make sure that they are safe before they are released
Rupel pushes a box 4.00 m by applying a 25.0-N horizontal force. What work does she do?
a. 10.0 J b. 100 J c. 125 J d. 550 J