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Alecsey [184]
3 years ago
8

27. A violation of the second law of thermodynamics would occur if a. a ball lying on the ground started to bounce. b. transfer

of energy by heat moved energy from an object at low temperature to an object at a higher temperature. c. a refrigerator heated the air in the room in which the refrigerator is located. d. any of the above occurred. e. (a) or (b) occurred, but not (c).
Physics
1 answer:
Crank3 years ago
7 0

Answer:

( a ) or ( b) occurred but not ( c )   ( E )

Explanation:

A violation of the second law of thermodynamics would occur if a ball lying on the ground started to bounce because a ball at rest ( isolated ) system cannot have a change in position on its own over time,

Another Violation of the second law is: the transfer of energy by heat moved energy from an object at low temperature to an object at a higher temperature on its own . this is because transfer of heat energy can only occur from an object of higher temperature to an object of lower temperature unless the object is been worked on  externally

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A light-rail commuter train accelerates at a rate of 1.35 m/s2. How long does it take to reach its top speed of 80.0 km/h, start
Len [333]

Answer:

a) 16.46 seconds.

b) 13.46 seconds

c) 2.67 m/s²

Explanation:

Acceleration = a = 1.35 m/s²

Final velocity = v = 80 km/h = 80\frac{1000}{3600}=22.22\ m/s

Initial velocity = u = 0

Equation of motion

v=u+at\\\Rightarrow 22.22=0+1.35t\\\Rightarrow t=\frac{22.22}{1.35}=16.46\ s

Time taken to accelerate to top speed is 16.46 seconds.

Acceleration = a = -1.65 m/s²

Initial velocity = u = 80 km/h= 80\frac{1000}{3600}=22.22\ m/s

Final velocity = v = 0

v=u+at\\\Rightarrow 0=22.22-1.65t\\\Rightarrow t=\frac{22.22}{1.65}=13.46\ s

Time taken to stop the train from top speed is 13.46 seconds

Initial velocity = u = 80 km/h= 80\frac{1000}{3600}=22.22\ m/s

Time taken = t = 8.3 s

Final velocity = v = 0

v=u+at\\\Rightarrow 0=22.22+a8.3\\\Rightarrow a=\frac{-22.22}{8.3}=-2.67\ m/s^2

Emergency deceleration is 2.67 m/s²

8 0
4 years ago
Correlation alone_____ causation A.proves B.complicates C. Disproves D. does not prove
tatuchka [14]

Answer:

D.

Explanation:

This is the essence of “correlation does not imply causation”. When there is a common cause between two variables, then they will be correlated. This is part of the reasoning behind the less-known phrase, “ There is no correlation without causation ”.

5 0
4 years ago
What are stepdown transformers used for
lesya692 [45]

Answer:

Step down transformers are used in power adaptors and rectifiers to efficiently decrease the voltage. They are also used in electronic SMPS.

Explanation:

pls mark me as brainlist

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7 0
3 years ago
Need ASAP!! An object lies motionless on a rough inclined surface .
PSYCHO15rus [73]

Answer:

yes

Explanation:

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Find the frequency (in hertz) of the first overtone for a 1.75 m pipe that is closed at only one end. Use 350 m/s for the speed
serg [7]

Answer:

The first overtone frequency is 100 Hz.

Solution:

According to the question:

Length of pipe, l = 1.75 m

Speed of sound in air, v_{sa} = 350 m/s

Frequency of first overtone, f_{1} is given by:

f_{1} = \frac{v_{sa}}{2l}

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