1 – for every natural process, the entropy of theuniverse a- is destroyed b- dec

Question

1 – for every natural process, the entropy of theuniverse

a- is destroyed

b- decreases

c- increases

d- remains constant

2- a heat engine

a – converts heat to work

b- transfers heat from a low temperature reservoir

c- converts heat to internal energy

d- converts work to heat

3- A Stone is dropped from a bridge 15m above a river. With whatspeed does the stone hit the water?

a- speed = 294 m/s   

b- speed = 17 m/s

c- speed = 34 m/s

d- speed = 588 m/s

4-a student weighting 700 N climbs a flight of stairs 5.0 mhigh. Calculate the work done.

A – 7.00(10)^2 W

b- 35 (10)^2 W

c- 3.5 x 10^2 W

d- 7.0 m/s

5- a ball is dropped from an upper story dorm window. Neglectingair resistance what is the speed of the ball when it has fallen 2.5m?

     a- 49 m/sec

b- 20 m/ sec

c- 7.0 m^2/s^2

d- 7.0 m/s

6 – a student with 5.0 kg book bag on her way to classclimbs two flights of stairs (a 10 m vertical distance) in 15 s atwhat rate did the student do work in carrying the book bag up thestairs?

a- 33 W

b- 490 W

c- 7 W

d- 33 J

7- the energy needed to change the phase of a substance iscalled?

a- latent heat

b- potential energy

c- heat

d- power

8 – gas pressure is caused by molecular ______ with thewalls of the container.

a- speed   b- collisions c- mass d-density

9- the first law of thermodynamics states that heat added toclosed system can change the internal energy of the system and ordo

a- work

b- increase the external energy

10 – the energy balance in a thermodynamic process isexpressed in the

a- second law of thermodynamics

b- first law of thermodynamics

c- third law of thermodynamics

Explanation / Answer

(1) for every natural process entropy of universeincreses. (2)converts heat into work. (3) given , u= o , s= 15m , v=?, a = 9.8m/s2 from the kinematiceeq , v2- u2=2as plug values, v = 17m/s, (4)work done W = F.s= 7*102*5 =35*102W (7) latent heat, (8)collisions (9)work (10)fist law of thermodynamics. (5) s= 2.5musing kinematic eq v2-u2= 2as plug value, v= 7m/s.

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