If you mix a typical iodine ion (I, atomic no. = 53) with a typical barium ion (Ba, atomic no. = 56), what compound is formed?

A) BaI2
B) BaI
C) Ba56I53
D) Ba2I
E) Ba2I2


Answer: A

Physics & Space Science

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Instructions: On occasion, the notation  = [A, ?] will be a shorthand notation for  .

Anthony has added the vectors listed below and gotten the result . What errors has he made? ?       ?      ? A.

He lost the minus sign in vector .

B.
He read the  in  as .

C.
He lost the minus sign in vector .

D.
All of the above are correct.

E.
Only (a) and (b) above are correct.

Physics & Space Science

To transmit power over great distances, why is HIGH VOLTAGE chosen for long distance power lines?

What will be an ideal response?

Physics & Space Science

If y = 0.02 sin (30x ? 400t) (SI units) and if the mass density of the string on which the wave propagates is 0.005 kg/m, then the transmitted power is

a. 1.03 W. b. 2.13 W. c. 4.84 W. d. 5.54 W. e. 106 W.

Physics & Space Science

Three long wires parallel to the x axis carry currents as shown. If I = 20 A, what is the magnitude of the magnetic field at the origin?



a.
37 ?T

b.
28 ?T

c.
19 ?T

d.
47 ?T

e.
58 ?T

Physics & Space Science