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Molodets [167]
3 years ago
6

Initially, 0.05kg of air is contained in a piston cylinder device at 200 oc and 1.6 mpa. the air then expands at constant temper

ature to a pressure of 0.4 mpa. assume the process occurs slowly enough that the acceleration of the piston can be neglected. the ambient pressure is 101.35kpa. (i) determine the work (kj) performed bt the air in the cylinder on the piston. (ii) determine the work (kj) performed by the piston on the ambient environment. neglect the cross-sectional area of the connecting rod. (iii) determine the work transfer (kj) from the piston to the connecting rod. neglect friction between the piston and cylinder. assume that no heat transfer to or from the piston occurs and that the energy of the piston does not change solution
Physics
1 answer:
myrzilka [38]3 years ago
6 0
A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs. 
Read more on Brainly.com - brainly.com/question/1581851#readmore
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Rock can be weathered and eroded in the rock cycle. What might happen with the resulting rock particles? A. New rock is formed f
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Answer: A
After rocks are eroded the particles turn into a sedimentary rock.
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O resumo do filme Tartarugas Ninjas até hoje.
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8 0
3 years ago
A student pulls a block over a rough surface with a constant force FP that is at an angle θ above the horizontal, as shown above
gizmo_the_mogwai [7]

Answer:

B.The force of friction between the block and surface will decrease.

Explanation:

The force of friction is given by

F_s = \mu N

where \mu is the coefficient of friction and N is the normal force.

When the student pulls on the block with force F_p at an angle \theta, the normal force on the block becomes

N  = Mg- F_psin(\theta)

and hence the frictional force becomes

F_s = \mu (Mg- F_psin(\theta)).

Now, as we increase \theta, sin(\theta) increases which as a result decreases the normal force Mg- F_psin(\theta), which also means the frictional force decreases; Hence choice B stands true.

<em>P.S: Choice D is tempting but incorrect since the weight </em>W=mg<em> is independent of the external forces on the block. </em>

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3 years ago
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During a tornado in 2008 the Peachtree Plaza Westin Hotel in downtown Atlanta suffered damage. Suppose a piece of glass dropped
Darina [25.2K]

Answer:

Time = t = 6.62 s

Explanation:

Given data:

Height = h = 215 m

Initial velocity = v_{i} = 0 m/s

gravitational acceleration = g = 9.8 m/s²

Time = t = ?

According to second equation of motion

                            h = v_{i}t + \frac{1}{2}gt^{2}

As initial velocity is zero, So the first term of right hand side of above equation equal to zero.

                                 h = \frac{1}{2}gt^{2}

                                        t² = \frac{2h}{g}

                                         t =\sqrt{\frac{2h}{g} }

                                         t = \sqrt{\frac{(2)(215) }{9.8} }

                                         t = 6.62 s

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In a nuclear power plant, nuclear energy is first changed to ? energy
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Thermal energy Thermal energy <span>Thermal energy</span>
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