1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Katarina [22]
3 years ago
8

A cylindrical riser is to be designed for a sand casting mold. The length of the cylinder is to be 1.5 times its diameter. The c

asting is a square plate, each side = 12 in and thickness = 1.1 in. If the metal is cast iron, and the mold constant = 13.0 min/in2 in Chvorinov's rule, determine the length of the riser in inches so that it will take 35% longer for the riser to solidify.
Engineering
1 answer:
ollegr [7]3 years ago
3 0

Answer:

d = 2.711

H = 4.06 inch

Explanation:

Given Data:

length = 1.5 times of diameter of cylinder

square plate side = 12 inch, thickness = 1.1 inch

mold constant = 13.0 min/in^2

Casting volume

V= tl^2

t is thickness and L is length

substitute t = 1.1 inch, L =12 inch

v = 1.1\times 12^2 = 158.4 inc^3

casting area

A = 2L^2 + 4Lt

A = 2\times 12^2 + 4\times 12\times 1.1

A = 340.8 in^2

Ratio between casting volume and area

\frac{v}{A} = {158.4}{340.8} = 0.464

Total solidification time TST using chvorinov rule

TST = Cm [\frac{V}{A}]^2

Cm is mold constant

TST = 13\times 0.464^2[/tex]

TST = 2.798 min

TST for riser

riser TST = 1.30\times2.798 = 3.63

Riser volume v = \frac{\piD^2 H}{4}

v = 0.25\pi\times D^2(1.5D)

v = 0.375\pi D^3

Riser area

A =\frac{2\pi D^2}{4} + \pi DH

A = 0.5\pi D^2 +1.5\pi D^2

A = 2\pi D^2

RATIO of riser volume and area

\frac{v}{A} = \frac{0.375\piD^3}{2.0\pi D^2} = 0.1875 D

TST for riser

TST = Cm [\frac{v}{A}]^2[tex]TST= 13 \times (0.1875 D)^2

3.36 =13\times (0.1875 D)^2

d = 2.711

H = 1.5 \times 2.711  =4.06 inc

H = 4.06 inch

You might be interested in
An AM radio transmitter radiates 550 kW at a frequency of 740 kHz. How many photons per second does the emitter emit?
kifflom [539]

Answer:

1121.7 × 10³⁰ photons per second

Explanation:

Data provided in the question:

Power transmitted by the AM radio,P = 550 kW = 550 × 10³ W

Frequency of AM radio, f = 740 kHz = 740 × 10³ Hz

Now,

P = \frac{NE}{t}

here,

N is the number of photons

t is the time

E = energy = hf

h = plank's constant = 6.626 × 10⁻³⁴ m² kg / s

Thus,

P = \frac{NE}{t} = \frac{N\times(6.626\times10^{-34}\times740\times10^{3})}{1}          [t = 1 s for per second]

or

550 × 10³ = \frac{N\times(6.626\times10^{-34}\times740\times10^{3})}{1}

or

550 = N × 4903.24 × 10⁻³⁴

or

N = 0.11217 × 10³⁴ = 1121.7 × 10³⁰ photons per second

7 0
3 years ago
1. A soil core sampling tube of 4 cm diameter, 12 cm length and initial mass of 0.525 kg (sample only), was dried at 105o C and
belka [17]

Answer:

porosity = 0.07 or 7%

dry bulk density = 3.25g/cm3]

water content =

Explanation:

bulk density = dry Mass / volume of  sample

dry mass = 0.490kg = 490g

volume = πr2h = 3.142 * 2 *2 *12 = 150.8cm3

density = 490/150.8 = 3.25g/cm3

porosity = \frac{wet mass - dry mass }{wet mass} = \frac{0.525 - 0.49}{0.525} = 0.07 or 7%

water content =  \frac{wet mass - dry mass}{wet mass} = 7%

8 0
4 years ago
Read 2 more answers
Who is the worst clown in rouge linage
Lerok [7]
All of them
explanation:
you don’t need one
4 0
3 years ago
Technician A says inspecting the operation of the automatic emergency brake system helps determine whether the spring brakes wil
laila [671]

Answer: Both Technicians

Explanation:

When testing a spring break it is advisable to Step on and off the brake, with the engine off, the parking brake knob is expected to pop out when air pressure falls between 20-40 psi.

Go under the vehicle and pull the spring brakes.

Turn on the engine back and pump the brake pedal down to the floor. To test the spring breaks

8 0
3 years ago
The development team recently moved a new application into production for the accounting department. After this occurred, the Ch
Novay_Z [31]

Answer: (A) Security regression testing

Explanation:

  The security regression testing is used to prevent the re-occurring process. The regression testing is the type of the testing that intends to affirm that a program or code or application changes has not influenced existing highlights and it keeps up the agenda.

The agenda ought to be similarly identified with necessity that was concluded. By checking this both then relapse testing occurs and this won't reoccurred from next time.

The regression testing improvements groups must ensure that changes, updates and new discharges don't presents imperfections and vulnerabilities that could be misused by the people.

4 0
4 years ago
Other questions:
  • The uniform slender rod has a mass m.
    5·1 answer
  • When compared to early vehicles, modern vehicles do not have?
    6·2 answers
  • A completely mixed activated-sludge process is being designed for a wastewater flow of 10,000 m3/d (2.64 mgd) using the kinetics
    6·1 answer
  • In the elastic range of a tension test, an extensometer records an extension of 1.207 x 10-2 mm as the load increases by 5 kN. C
    15·1 answer
  • A 4-pole, 3-phase induction motor operates from a supply whose frequency is 60 Hz. calculate: 1- the speed at which the magnetic
    6·1 answer
  • Train levels a station and travels north at 60km/hr. Two hours later, a second train leaves on a parallel track and travels nort
    12·1 answer
  • Which of the following reveals the most common obstacle that engineers must overcome?
    11·2 answers
  • Select the correct answer. Which physical quantity measures the rate at which an object’s velocity changes?
    11·1 answer
  • 1 A power transmission includes a belt drive, a chain drive and a gear drive. Which of the following is the best arrangement bet
    5·1 answer
  • An unknown relative passes away and bequeaths upon you a small tract of land in Amherst. You decide to build a two-story storage
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!