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Gnesinka [82]
4 years ago
15

Calculate the maximum internal crack length allowable for a 7075-T651 aluminum alloy component that is loaded to a stress one-ha

lf of its yield strength. Assume a yield strength 495 MPa, a plane strain fracture toughness of 24 MPa and that Y = 1.39.
Engineering
1 answer:
aleksley [76]4 years ago
7 0

Answer: 0.0033 m = 3.3 mm (0.13 in.)

Explanation:

since this problem requires us to calculate the maximum internal crack length allowable for the 7075-T651

aluminum alloy is given that it is loaded to a stress level equal to one-half of its yield strength.

For this alloy, KIc 24 MPa \sqrt{m}(22 ksi \sqrt{in}); also, σ= σ_y/2 = (495 MPa)/2 = 248 MPa (36,000 psi).

Now solving for 2ac gives us;

2a_c=2/π (K_IC/γσ)^2=2/π [(24MPa √m)/(1.35)(248MPa) ]^2=0.0033m=3.3mm (0.13 in.)

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fredd [130]
Sound (like music and background sound) and detail. The music and background sound is what sets the mood for the game. In horror games, the sound is sometimes uneasy to make the player feel anxious, and when something chases you the music turns into fast-pace and making the player scared and feel that adrenaline. The detail also is a great factor. The more realistic a game is, the more it feels like real life and determines if the player will get a real reaction from the game.
6 0
3 years ago
A 90-hp (shaft output) electric car is powered by an electric motor mounted in the engine compartment. If the motor has an avera
Ostrovityanka [42]

Answer:

The rate of heat supply is 8.901 horse-power.

Explanation:

From Thermodynamics energy efficiency of the electric car (\eta), no unit, is the ratio of translational mechanical power (\dot E_{out}), measured in horse power, to electric power (\dot E_{in}), measured in horse-power. The rate of heat supply (\dot E_{l}), measured in horse-power, by the motor to the engine compartment at full load is difference between electric energy and translational mechanical energy. That is:

\eta = \frac{\dot E_{out}}{\dot E_{in}} (1)

\dot E_{l} = \dot E_{in}-\dot E_{out} (2)

\dot E_{l} = \left(\frac{1}{\eta}-1\right)\cdot \dot E_{out} (3)

If we know that \eta = 0.91 and \dot E_{out} = 90\,hp, then rate of heat supply is:

\dot E_{l} = \left(\frac{1}{0.91}-1 \right)\cdot (90\,hp)

\dot E_{l} = 8.901\,hp

The rate of heat supply is 8.901 horse-power.

4 0
3 years ago
4. Which of the following drive roll designs is used
Yuki888 [10]
Knurled drive rolls are used with gas and self shielded flux cored and metal cored wires, which are softer due to the flux inside and the tubular design.
5 0
4 years ago
A test of a driver’s perception/reaction time was conducted on a special test track in a rural area. The friction factor f = 0.6
alukav5142 [94]

Answer:

a) tD = 4.36 sec

b) tD = 5.2 sec

Explanation:

a)

V = 0

work-done = change in kinetic energy

f.m.g(d) = 1/2m(55^2 - v^2)

divided both sides by m

1/2(55^2 - v^2) = f.g(d)

1/2(55 * 1.467)^2 ft^2/sec^2 = 0.6 * (9.81 * 3.28) * d

3255.03 = 19.306d

d = 3255.03 / 19.306

d = 168.6 ft

now D = 520 - 168.6 = 351.4

therefore reaction/perception time = tD

tD = 351.4 / ( 55 * 1.467)

tD = 4.36 sec

b)

Also here, V = 35 mph

so

1/2(55^2 - 35^2)*(1.467)^2 ft^2/sec^2) = 0.6 * (9.81 * 3.28) * d

1936.88 = 19.306d

d = 1936.88 / 19.306

d = 100.325ft

also D = 520ft - 100.325ft = 419.675

so tD = 419.675 / ( 55 * 1.467)

tD = 5.2 sec

7 0
3 years ago
Tadpoles raised in water with atrazine levels of 0.1 ppb should produce a higher percentage of male frogs with gonadal abnormali
Kobotan [32]

Answer:

correct option is c. a testable prediction leading to design of an experiment

Explanation:

The results of raising tadpoles were estimated to be water with an atrazine level of 0.1 ppb compared to those grown in pure water. So, this is not the question. If this assumption can now be tested, an experiment can be made in which a certain number of tadpoles can be raised in pure water and the same number of tadpoles can be raised in water with a 0.1ppb atrazine level can. The difference between the two populations can be estimated or compared.

8 0
3 years ago
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