Question
In: Chemistry
A .500 cm diameter sphere is gold plated. The gold is Au +3, current is 5...
A .500 cm diameter sphere is gold plated. The gold is Au +3, current is 5 amps. The coat is a thickness of .0750 micron, density of gold is 19.31 g/cm^3. How long will it take to coat? Correct answer is 28 minutes apparently but how???
Solutions
queen_honey_blossom answered 2 years agoRelated Solutions
a thin circular-disk earning,5.00 cm in diameter is plated with a coating of gold 0.20 mm...
a thin circular-disk earning,5.00 cm in diameter is plated with
a coating of gold 0.20 mm thick from an Au+3 bath.
a) how many days does it take to deposit the gold on one side of
this earring if the current is 0.010 Ampere (d of Au = 19.3
g/cm3)
b) how many days does it take to deposit the gold on both sides
of a pair of these earrings
c) if the price of Au is $320 per troy...
A toroid with inner diameter of 3 cm, outer diameter of 5 cm, and height of...
A toroid with inner diameter of 3 cm, outer diameter of 5 cm,
and height of 0.1 cm is made of a body-centered-cubic (bcc)
paramagnetic material with lattice parameter equal to 0.5 nm. The
toroid is wrapped by a copper wire in 20 turns. If each atom of the
magnetic material has a magnetic moment of 1.5µB (Bohr Magneton),
(a) (1.5 pt) What is the saturation magnetization (in A/m) of the
material? (b) (1.5 pt) If a current of 2...
Drag measurements were taken for a 5 cm diameter sphere in water at 20 °C to...
Drag measurements were taken for a 5 cm diameter sphere in water
at 20 °C to predict the drag force of a 1 m diameter balloon rising
in air with standard temperature and pressure. Given kinematic
viscosity of water (v) = 1.0 X 10-6
m2/s and kinematic viscosity of air (v) = 1.46
X 10-5 m2/s.
Perform the Buckingham Pi theorem to generate a relationship
for FD as a function of the independent variables.
Assume the drag FD is a...
Drag measurements were taken for a 5 cm diameter sphere in water at 20 °C to...
Drag measurements were taken for a 5 cm diameter sphere in water
at 20 °C to predict the drag force of a 1 m diameter balloon rising
in air with standard temperature and pressure. Given kinematic
viscosity of water (v) = 1.0 X 10-6
m2/s and kinematic viscosity of air (v) = 1.46
X 10-5 m2/s.
Perform the Buckingham Pi theorem to generate a relationship
for FD as a function of the independent variables.
Assume the drag FD is a...
Gold is plated from a solution of Au3+ using a constant current of 4.86 A for...
Gold is plated from a solution of Au3+ using a
constant current of 4.86 A for 352 minutes.Calculate the grams of gold plated out of
solution.
A sphere with a diameter of 70 cm is held at a temperature of 290
A sphere with a diameter of 70 cm is held at a temperature of
290
1. A 0.750 kg hollow sphere with a diameter of 25 cm diameter starts from rest...
1. A 0.750 kg hollow sphere with a diameter of 25 cm diameter
starts from rest at the top of a 65 cm tall incline. There is just
enough friction on the incline to make the sphere roll instead of
slide.
(a) What types of energy does the sphere have at the top? at the
bottom?
(b) What is the moment of inertia of the sphere?
(c) What is the velocity of the sphere when it reaches the
bottom of...
The inner surface of a 5 cm diameter, 3 mm thick, and 7 cm high styrofoam...
The inner surface of a 5 cm diameter, 3 mm thick, and 7 cm high
styrofoam cup is at 70 °C. the outer surface is exposed to air at
20 °C. the surface heat transfer coefficient associated with the
outer surface is 8 w/m2 °C. Determine
The heat transfer rate through the cylindrical surface of the
cup.
The outer surface temperature of the cup.
2. Initially, the steel sphere with a diameter of 15 cm with a temperature of 200°C...
2. Initially, the steel sphere with a diameter of 15 cm with a
temperature of 200°C was left to cool in the airflow at a
temperature of 6 m/s. By making the necessary acceptances,
calculate the amount of time the aluminum sphere will fall to a
temperature of 50°C.
The relevant correlation for forced transport on the sphere;
NuD = 2 + (0.4 ReD 0.5+ 0.06 ReD 2/3) Pr 0.6 (μo/μy)1/4
Two 2.0-cm-diameter insulating spheres have a 5.60 cm space between them. One sphere is charged to...
Two 2.0-cm-diameter insulating spheres have a 5.60 cm space
between them. One sphere is charged to + 40.0 nC , the other to -
60.0 nC .
Part A
What is the electric field strength at the midpoint between the
two spheres?
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