Question

A 46 g nugget of copper has a net charge of 2.25 μC.

What fraction of the copper's electrons has been removed? Each copper atom has 29 protons, and copper has an atomic mass of 63.5.

Answer #1

Calculate the average drift speed of electrons traveling through
a copper wire with a crosssectional area of 30 mm2 when carrying a
current of 30 A (values similar to those for the electric wire to
your study lamp). Assume one electron per atom of copper
contributes to the current. The atomic mass of copper is 63.5 g/mol
and its density is 8.93 g/cm3 . Avogadro’s number is 6.022 × 1023
and the fundamental charge is 1.602 × 10−19 C. Answer...

Gold has 79 electrons per atom and an atomic mass of 197 uu.
Part A
What is the total charge of all the electrons in 3.7-kgkg bar of
gold?
Express your answer to two significant figures and include the
appropriate units.
B What is the net charge of the bar?

What net charge would you place on a 527 g piece of sulfur if
you put an extra electron on 1 in 1012 of its atoms?
(Sulfur has an atomic mass of 32.1.)
___ C

What is the net electrostatic force (magnitude and direction) on
a particle with charge
+5 μC situated at the apex of an equililateral triangle if each of
the other corners contain
identical charges of -6 μC and the length of a side of the triangle
is 0.10 m?

Suppose you had a 85 g piece of sulfur.
What net charge, in coulombs, would you place on it if you put
an extra electron on 1 in 1012 of its atoms? (Sulfur has
an atomic mass of 32.1)

1) If the potential due to a point charge is
8.00×103V at a distance of 12.0 m, what are the sign and
magnitude of the charge?
2) There are two charges q1 = 35 μC and q2
= -50 μC fixed in place on the x-axis. q1 is located at
x=0 and q2 is located at x=0.5 What is the location on
the x-axis where the potential equals 0?
3) In nuclear fission, a nucleus splits roughly in half. (a)...

A particle with a mass of 3 g and a charge of +5 μC is released
from rest at a distance of 27 cm from another particle with a
charge of +27 μC, which is held fixed. How fast is the moving
particle traveling when it is 134 cm away from the fixed
particle?
Answer should be to two decimal place and in m/s.
2. parallel-plate air-gap capacitor is constructed from two
square plates of side length 29 cm. The...

Helium is the lightest noble gas and the second most abundant
element (after hydrogen) in the universe.
a.The radius of helium atom is 3.1 x 10^-11m; the radius of the
nucleus is 2.5 x 10^-15m. What fraction of the spherical atomic
volumeis occupied by the nucleus
b. The mass of a helium-4 isotope atom is 6.64648 x 10^-24g and
each of the two electrons has a mass of 9.10939 x 10^-28 g. What
fraction of this atom’s mass is contributed...

1. A bacterium has 1.8 × 1016 protons and a net
charge of 9.4 pC.
If you paired them up, what fraction of the protons would have
no electrons?
2. Three charges are located as shown in the figure, with values
q1 = 3.5 × 10-16 C,
q2 = -1.1 × 10-16 C,
q3 = 6.75 × 10-16 C. The charges are
separated by d1 = 3.2 × 10-6 m and
d2 = 1.5 × 10-6 m.
What is the...

Part A.) What is the total negative charge, in
coulombs, of all the electrons in a small 1.15 g sphere of carbon?
One mole of C is 12.0 g , and each atom contains 6 protons and 6
electrons. Express your answer using three significant figures.
Part B.) Suppose you could take out all the
electrons and hold them in one hand, while in the other hand you
hold what is left of the original sphere. If you hold your...

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