Answer: thermal
Explanation:
Moving particles transfer thermal energy through a fluid by forming convection currents.
Answer:
D wavelength
Explanation:
The different wavelengths determine the color.
Answer: work must be done on the system (Option A)
Explanation:
The second law of thermodynamics is the fundamental law of nature; it states that energy can be transferred from cold objects to hot objects only, if work is done on the system. If energy is added to the system then as a result the thermal energy would increase. Second law of thermodynamics is used to determine whether a process is spontaneous or not. Moreover,the second law of thermodynamics is also used in refrigerators.
Answer:

Explanation:
*Assume the parallel disks have equal diameters.
Given the electric strength as
transferring
electrons, the disk's Area can be calculated using the formula:

#We now calculate the disks diameter:

Hence, the diameter of the disks is 
Answer:
The first one (60%)
Explanation:
The first one converts 15% more energy than the other one. Therefore, it is more efficient.
Hope this helps!