1st question is False, 2nd question is True
Balanced forces do not cause a change in motion. When balanced forces act on an object at rest, the object will not move. If you push against a wall, the wall pushes back with an equal
Answer:
efficiency = 5.4%
Explanation:
Efficiency of heat engine is given as

now we will have

so we will have

now we know that

so we have



so efficiency is 5.4%


Explanation:
Snell's law (also known as Snell–Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.
Answer:
Yes, it is. The summers and the winters are getting warmer. Also in cold places like Alaska, the temperatures are rising.
Explanation: