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Urea pellets are made by spraying drops of molten urea into cold gas at the top...
Urea pellets are made by spraying drops of molten urea into cold gas at the top of a tall tower and allowing the material to solidify as it falls. Pellets 6 mm in diameter are to be made in a tower 25 m high containing air at 20 °C. The density of urea is 1330 kg/m3 . a. What would be the terminal velocity of the pellets, assuming free-settling conditions? 2 b. Would the pel1ets attain 99 percent of this velocity before they reached the bottom of the tower?
Solutions
Amanda K answered 11 months agoRelated Solutions
Knight 2.20 Ball bearings are made by letting spherical drops of molten metal fall inside a...
Knight 2.20 Ball bearings are made by letting spherical drops of
molten metal fall inside a tall tower – called a shot tower – and
solidify as they fall.
If a bearing needs 4.0 s to solidify enough for impact, how high
must the tower be?
What is the bearing’s impact velocity?
2, . For Grading Knight 2.57 A lead ball is dropped into a lake
from a diving board 5.0 m above the water surface. After entering
the water,...
Metallic magnesium can be made by the electrolysis of molten MgCl2. Part A What mass of...
Metallic magnesium can be made by the electrolysis of molten
MgCl2.
Part A
What mass of Mg is formed by passing a current of 6.00 A through
molten MgCl2 for 4.60 days?
m =
g Mg
Part B
How many minutes are needed to plate out 29.00 g Mg from molten
MgCl2, using 4.10 A of current?
t =
min
Metallic magnesium can be made by the electrolysis of molten MgCl2. Part A What mass of...
Metallic magnesium can be made by the electrolysis of molten
MgCl2.
Part A
What mass of Mg is formed by passing a current of 4.00 A through
molten MgCl2 for 4.70 days?
Express your answer using three significant figures.
Part B
How many minutes are needed to plate out 26.00 g Mg from molten
MgCl2, using 2.90 A of current?
Express your answer using three significant figures.
Metallic magnesium can be made by the electrolysis of molten MgCl2. a. What mass of Mg...
Metallic magnesium can be made by the electrolysis of molten
MgCl2.
a. What mass of Mg is formed by passing a current of 5.35 A
through molten MgCl2 for 3.30 days?
b. How many minutes are needed to plate out 18.00 g Mg from
molten MgCl2, using 3.20 A of current?
The Physics Girl drops a Spalding Hi-Bounce ball ON TOP of a Basketball from1 m until...
The Physics Girl drops a Spalding Hi-Bounce ball ON TOP of a
Basketball from1 m until the basketball with the Spalding on top of
it hits the ground. The Basketball then STAYS still on the ground
but the Spalding FLIES UP into the air. The MASS of the Spalding is
0.1 kg and the mass of the Basketball of 1.0 kg.Using ONLY
conservation of ENERGY predict how HIGH the Spalding ball flies
upward into the air.
Please write all the...
Much has been made over the past few years of drops and rises in the price...
Much has been made over the past few years of drops and rises in
the price of oil, with drops and rises often blamed on OPEC (drops
because they are trying to drive out US frackers and rises because
they have succeeded in driving them out. Two questions:
1) How can OPEC manipulate the oil market?
2) If you are reducing price to wipe out your competitors, you
need a credible strategy to get the money back. Is OPEC able...
A gas-filled container, equipped with a pressure gauge, was placed on a cold winter morning in...
A gas-filled container, equipped with a pressure gauge, was
placed on a cold winter morning in a throttle. After stabilizing
the pressure gauge, the absolute pressure of the gas was read to
0.15 MPa. Then the equipment was placed indoors and the container
was immersed in a pot of boiling water. The gas pressure was now
read to 0.21 MPa. What temperature prevailed in the snow?
NGW, a consumer gas provider, estimates a rather cold winter. As a result it decides to...
NGW, a consumer gas provider, estimates a rather
cold winter. As a result it decides to enter into a futures
contract on the NYMEX for natural gas on November
2, 2016. The trading unit is 10,000 million British thermal
units (MMBtu). The three-month futures contract
rate is $7.00 per MMBtu, so each contract will cost NGW
$70,000. In addition, the exchange requires a
$5,000 deposit on each contract. NGW enters into 20 such
contracts.
Required:
1. Why is this futures...
NGW, a consumer gas provider, estimates a rather cold winter. As a result it decides to...
NGW, a consumer gas provider, estimates a rather cold winter. As
a result it decides to enter into a futures contract on the NYMEX
for natural gas on November 2, 2016. The trading unit is 10,000
millioin British thermal units (MMBtu). The three month futures
contract rate is $7.00 per MMBtu, so each contract will cost NGW
$70,000. In addition, the exchange requires a $5,000 deposit on
each contract. NGW enters into 20 such contracts.
Why is the futures contract...
A rectangular box with no top is to be made to hold a volume of 32...
A rectangular box with no top is to be made to hold a volume of
32 cubic inches. Which of following is the least amount of material
used in its construction?
a.) 80 in2
b.) 48 in2
c.) 64 in2
d.) 96 in2
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