The answer is actually 1 & 17, maybe you meant to put 1&17 as option b
The conservation of energy always holds true even when not clearly observable in machines that are less than 100% efficient. More often than not a machine will suffer energy losses (e.g. consider for a cooling fan: friction between the rotating blades, drag resistance in the air the fan is pushing around, resistance in the wire, and heat radiating/conducting away from the circuitry).
a toy/model steam engine. how it works and how to measure horse power
Answer:
Plan B.
Because flexibility is best improved by stretching.
Explanation:
Improving and increasing flexibility is done by having stretching sessions daily which maintains and widens the range of motion in the joints and stretches muscles.
Answer:
B.) The cake rises as gas bubbles form in the baking cake.
Explanation:
I got A on the quiz