1. What does PE stand for? Physical Education
2. Name one common PE exercise? Your choice A knee push up B piano keys
Answer:
Explanation:
First last of thermodynamics, just discusses the changes that a system is undergoing and the processes involved in it. It explains conservation of energy for a system undergoing changes or processes.
Second law of thermodynamics helps in defining the process and also the direction of the processes. It tells about the possibility of a process or the restriction of a process. It states that the entropy of a system always increases.
For this to occur the energy contained by a body has to diminish without converting to work or internal energy. So imagine a machine which works with less than efficiency, this means there are losses but they don’t show up anywhere. But the energy is obtained from a higher energy source to lower.
The easy way to do this is with an imaginary device that extracts zero-point energy to heat a quantity of gas. Energy is being created, so the first law is violated, and the entropy of the system is increasing as the gas heats up.
First law is violated since the energy conversion don't apply but the direction of work is applied so second law is satisfied.
Answer:
a) Qh= 6750 kJ
b) e = 0.296
c) = 390.625° C
Explanation:
Given:
Work done, W = 2000 kJ
Heat flow, Q = 4750 kJ
Temperature at which heat flows out, = 275° C
a) Now, the heat flow through the engine (Qh)
Qh = W + Q
or
Qh = 2000 + 4750
or
Qh= 6750 kJ
b) The efficiency (e) is given as:
on substituting the values, we get
or
e = 0.296
c)
where,
is the temperature at which heat flow
on substituting the values, we get
or
= 390.625° C
The maximum torque that can act on the loop is 7.875 N-m.
Torque:
Torque is a twisting or turning force that tends to cause rotation around an axis, which might be a center of mass or a fixed point. Torque can also be thought of as the ability of something that is rotating, such as a gear or a shaft, to overcome turning resistance.
The formula of torque:
Torque(T) = I B A
B = magnetic field of intensity
I = current =
A = area of the wire
l = length of the wire
l = 2πr
r = l/2π
A = πr²
= π(l/2π)²
= l²/4π
T = l²/4π IB
=( 1/4π) BIl²
= (1/4π) 0.30 × 150 ×× 2.20
= 7.875 N-m
Therefore the torque is 7.875 N-m.
To know more about the Torque refer to the link given below:
brainly.com/question/1691855
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Answer:
Explanation:
Given
CD has a playing time of
Initial angular speed of CD is
Final angular speed of DC is
Angular speed, when rpm is given
Final speed
Using equation of angular motion
Insert the values
Magnitude of angular acceleration is