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ella [17]
3 years ago
6

On the position time curve, if the slope of a tangent at a point is positive, that means:

Engineering
2 answers:
Gnoma [55]3 years ago
7 0

Answer:

  C. the object is moving forward

Explanation:

A positive slope means position is increasing when time is increasing. Generally, increasing position is "moving forward."

shtirl [24]3 years ago
5 0

Answer:

C. The object is moving forward

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As the impurity concentration in solid solution of a metal is increased, the tensile strength:________.a) decreasesb) increasesc
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3 years ago
An air standard cycle with constant specific heats is executed in a closed system with 0.003 kg of air and consists of the follo
Vsevolod [243]

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a) Please see attached copy below

b) 0.39KJ

c)  20.9‰

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The three process of an air-standard cycle are described.

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2. Kinetic and potential energy negligible.

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b) T₁=290K ⇒ u₁=206.91 kj/kg, h₁=290.16 kj/kg.

P₂V₂/T₂=P₁V₁/T₁⇒ T₂=P₂T₁/P₁ = 380/95(290K)= 1160K

T₃=T₂(P₃/P₂)⁽k₋1⁾/k =(1160K)(95/380)⁽⁰°⁴/₁.₄⁾ =780.6K

Qin=m(u₂₋u₁)=mCv(T₂-T₁)

=0.003kg×(0.718kj/kg.k)(1160-290)K= 1.87KJ

Qout=m(h₃₋h₁)=mCp(T₃₋T₁)

=0.003KG×(1.005kj/kg.k(780.6-290)K= 1.48KJ

Wnet, out= Qin-Qout = (1.87-1.48)KJ =0.39KJ

c)ηth= Wnet/W₍in₎ =0.39KJ/1.87KJ = 20.9‰

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2 years ago
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