Assume that a closed system undergoes a reversible process that takes it from state A to a different state B. In which of these cases will the entropy of the system remain constant? ea breeze is
1.if the process is isothermal
2.if the process is adiabatic
3.if the process is isovolumetric
4.The system's entropy will remain constant for all of these cases.
2
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A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
a. -0.64 kJ b. -0.40 kJ c. -0.52 kJ d. -0.28 kJ e. -0.76 kJ
Two parallel-plate capacitors have the same plate area, and the gap between the plates is filled with a dielectric with a dielectric constant equal to 6 . The gap in capacitor A is three times that in capacitor B. What is the ratio of the capacitance of A to B?
a. 1/3 c. 3 b. The ratio is not given. d. 18
A 50. cm diameter wheel is rotating initially at 2.0 revolutions per second. It slows down uniformly and comes to rest in 15 seconds
(a) What was its angular acceleration? (b) Through how many revolutions did it turn in those 15 s?
Transformers use ac so there will be the required
A) transfer of energy from coil to coil. B) voltage for transformation. C) change in magnetic field for operation. D) change in input current. E) magnetic field intensities.