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3 years ago

Which chemical reaction absorbs energy?

Physics

2 answers:

andre [41]3 years ago

8 0

Photosynthesis. Photosynthesis is the process the plant uses to absorbs light to make food

nalin [4]3 years ago

5 0

Photosythesis it a process of a plant take that energy and producing foods while the rest are push energy away as a destructive force current

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8-14 A Cu-30% Zn alloy tensile bar has a strain-hardening coefficient of 0.50. The bar, which has an initial diameter of 1 cm an

77julia77 [94]

Answer:

The true stress at true strain 0.05cm/cm is 80MPa

Explanation:

Given that

the strength coefficient is K

true strain is ε

strain hardening exponent is n

initial diameter of bar is d = 1cm, (10mm)

tensile force is F

engineering stress(S) = 120

the engineering stress(S) = $\frac{F}{\frac{\pi }{4}(d^2) }$

To find force (F) =

120 = $\frac{F}{\frac{\pi }{4}(100^{2} )}$

F = 120 * (π/4) * (100)

F = 9425N

Calculate the true strain (ε) = In (l₀ / l₁)

where

l₀ = initial length of the metallic bar = 3cm

l₁ = final length of metallic bar = 3.5cm

ε = In (3.5 / 3)

= In 1.1667

= 0.154cm/cm

Calculate the true stress (σ) at fracture point

= $\frac{F}{\frac{\pi }{4}(d^2) }}$

tensile force is F and final diameter of bar is d₁ (d in the eqn)

Substitute 9425 N for F and 0.926 cm (9.26mm) for d₁ (d in the eqn)

σ = $\frac{9425}{\frac{\pi }{4}(9.26^2) }}$

= 140MPa

To find the strength coefficient (K) of the material bar

K = $\frac{140}{\sqrt{0.154} }$

K = $\frac{140}{0.3925}$

= 356.75MPa

To calculate the true stress σ true strain of 0.05cm/cm

K = 356.75MPa

σ = $356.75(0.05)^0^.^5$

= $356.75 ( 0.2236)$

= 80MPa

The true stress at true strain 0.05cm/cm is 80MPa

6 0

3 years ago

Question

MariettaO [177]

Electrical Energy to ThermalEnergy Conversions.
1. A toaster draws electric current (electrical energy) from a wall outlet and converts these moving electriccharges into heat (thermal energy) in the filaments that turn red hot to cook your toast.

Part 2:
the law of conservation of energy states that the total energy of an isolated system in a given frame of reference remains constant—it is said to be conserved over time. Energy can neither be created nor destroyed; rather, it transforms from one form to another.

Hope I could help
source: wiki & soft schools

7 0

3 years ago

The surface of the sun has a temperature of about 5,800 Kelvin. What is the average kinetic energy of particles on the surface o

LenaWriter [7]

Answer:

273.15

Explanation:

So that's three over two times 1.38 times ten to the minus twenty-three joules per Kelvin, times 5500 degrees Celsius, the surface of the sun converted into Kelvin by adding 273.15. This works out to 1.20 times ten to the minus nineteen joules. So that's the average kinetic energy of hydrogen atoms.

5 0

3 years ago

How is the number 860,000 written in scientific notation?

Arlecino [84]

The number 860,000 written in scientific notation is ANSWER: 8.6 x 105

4 0

3 years ago

The linear momentum of a runner in a 100m dash is 750kg m/s. If the runners speed is 10m/s, What is his mass

Brilliant_brown [7]

Answer:

The mass of the runner is 75 kg

Explanation:

Recall that the linear momentum is defined as the product of the mass of the object in motion times its velocity: P = m * v

Therefore, for our case we have;

750 kg m/s = m * 10 m/s

solving for the mass (m) we get:

m = 750/10 kg =75 kg

7 0

3 years ago