Let a closed system execute a state change for which the heat is Q = 100 J and work is W = -25 J. Find E. ∆ (Formula: E = Q- W) ∆  a. 125 J  b. 123 J  c. 126 J  d. None of the above

Let a closed system execute a state
change for which the heat is Q = 100 J
and work is W = -25 J. Find E. ∆
(Formula: E = Q- W) ∆
 a. 125 J
 b. 123 J
 c. 126 J
 d. None of the above
by

1 Answer

Answer :

125 J
by

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From the steam table, determine the average constant pressure specific heat (c) of steam at 10 kPa and45.8 ˚C  A.1.79 kJ/ kg-˚C  B.10.28 kJ/ kg-˚C  C.30.57 kJ/ kg-˚C  D. 100.1 kJ/ kg-˚C Formula: h = c T ∆ ∆ From the steam table At 47.7 ˚C h= 2588.1 kJ/ kg At 43.8 ˚C h= 2581.1 kJ/ kg

Description : From the steam table, determine the average constant pressure specific heat (c) of steam at 10 kPa and45.8 ˚C  A.1.79 kJ/ kg-˚C  B.10.28 kJ/ kg-˚C  C.30.57 kJ/ kg-˚C  D. 100.1 kJ/ kg-˚C Formula: h = c T ∆ ∆ From the steam table At 47.7 ˚C h= 2588.1 kJ/ kg At 43.8 ˚C h= 2581.1 kJ/ kg

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The value for the ΔU of a system is -120 J. If the system is known to have absorbed 420 J of heat, how much work was done?  a. -540 J  b. -640 J  c. -740 J  d. -840 J formula: ΔU = q +w

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A closed system is one in which heat and work crosses the boundary of the system but the mass of the working substance does not crosses the boundary of the system.  A. Yes  B. No

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In the above problem, find the potential energy of the mass with respect to datum. (Formula: P = mgz/k )  a. 4875 j  b. 0.51 j  c. 0.46 j  d. None of the above

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Which is not true about Heat (Q):  a. Q is positive when heat is added to the body or system  b. Q is negative when heat is rejected by the body or system  c. Q is positive when heat is rejected by the body or system  d. None of the above

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The pressure gauge on a 2000 m³ tank of oxygen gas reads 600 kPa. How much volumes will the oxygen occupied at pressure of the outside air 100 kPa?  a) 14026.5 m³  b) 15026.5 m³  c) 13026.5 m³  d) 16026.5 m³ Formula: P1V1/T1 =P2V2/T2

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A car whose mass is 2 metric tons is accelerated uniformly from stand hill to 100 kmph in 5 sec. Find the driving force in Newton’s.  a. 11,120 N  b. 11,320 N  c. 11,420 N  d. 11520 N formula: F= ma / k

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Calculate the power output in horsepower of an 80-kg man that climbs a flight of stairs 3.8 m high in 4.0 s.  a) 744.8 hp  b) 0.998 hp  c) 746 hp  d) 1.998 hp Formula: Power = Fd/t = mgh/t F = W = mg d = h

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A vertical column of water will be supported to what height by standard atmospheric pressure. If the Y w = 62.4lb/ft3 po = 14.7 psi.  a. 44.9 ft  b. 33.9 ft  c. 22.9 ft  d. 55.9 ft formula: ho= po/Yw

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What horse power is required to isothermally compress 800 ft^3 of Air per minute from 14.7 psia to 120 psia?  A. 28 hp  B.108 hp  C.256 hp  D.13900 hp Formula: W= p1V1 ln (p1/p2) Power = dW / dt

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Which of the following is the work done for a closed reversible isometric system?  a. negative  b. positive  c. zero  d. undefined

Description : Which of the following is the work done for a closed reversible isometric system?  a. negative  b. positive  c. zero  d. undefined

Last Answer : zero

What is the value of the work done for a closed, reversible isometric system?  a. zero  b. positive  c. negative  d. positive or negative

Description : What is the value of the work done for a closed, reversible isometric system?  a. zero  b. positive  c. negative  d. positive or negative

Last Answer : zero

What is the value of the work done for a closed, reversible isometric system?  A. Zero  B. Positive  C. Negative  D. Positive or negative

Description : What is the value of the work done for a closed, reversible isometric system?  A. Zero  B. Positive  C. Negative  D. Positive or negative

Last Answer : Zero

First law of thermodynamics  (a) enables to determine change in internal energy of the system  (b) does not help to predict whether the system will or not undergo a change  (c) does not enable to determine change in entropy  (d) provides relationship between heat, work and internal energy  (e) all of the above.

Description : First law of thermodynamics  (a) enables to determine change in internal energy of the system  (b) does not help to predict whether the system will or not undergo a change  (c) does not enable ... entropy  (d) provides relationship between heat, work and internal energy  (e) all of the above.

Last Answer : Answer : e

A state occurs when a system is in equilibrium  a. Natural Environment  b. Closed System  c. Surrounding  d. Isentropic

Description : A state occurs when a system is in equilibrium  a. Natural Environment  b. Closed System  c. Surrounding  d. Isentropic

Last Answer : Natural Environment

What is a process in which the system remains infinitesimally closed to an equilibrium state at all times?  A. Path equilibrium process  B. Cycle equilibrium process  C. Phase equilibrium process  D. Quasi-state or quasiequilibrium process

Description : What is a process in which the system remains infinitesimally closed to an equilibrium state at all times?  A. Path equilibrium process  B. Cycle equilibrium process  C. Phase equilibrium process  D. Quasi-state or quasiequilibrium process

Last Answer : Quasi-state or quasi- equilibrium process

Mixture of ice and water form a  (a) closed system  (b) open system  (c) isolated system  (d) heterogeneous system  (e) thermodynamic system.

Description : Mixture of ice and water form a  (a) closed system  (b) open system  (c) isolated system  (d) heterogeneous system  (e) thermodynamic system.

Last Answer : Answer : d

A closed system is one in which  (a) mass does not cross boundaries of the system, though energy may do so  (b) mass crosses the boundary but not the energy (c) neither mass nor energy crosses the boundaries of the system  (d) both energy and mass cross the boundaries of the system  (e) thermodynamic reactions take place.

Description : A closed system is one in which  (a) mass does not cross boundaries of the system, though energy may do so  (b) mass crosses the boundary but not the energy (c) neither mass nor energy ...  (d) both energy and mass cross the boundaries of the system  (e) thermodynamic reactions take place.

Last Answer : Answer : a