I found your question in a worksheet and since you listed no options if I'm correct, the options were
A. Bumper Cars
B. waves in a ripple tank.
C. electromagnetic radiation
D. an orchestra
Well technically all of the above would be correct since the matter waves are real but have relatively short wavelengths that aren't immediately obvious and what we see is really just the superposition of matter waves, the best answer would be B, waves in a ripple tank.
I think it is A <span>High levels of muscular fitness can improve your self-image and improve or prevent chronic diseases such as diabetes, osteoporosis, and cardiovascular disease.</span>
<span>The moving car has some momentum, but
the stationary truck has none.
Momentum of any object is (mass) times (speed).
If the object isn't moving then it has no speed,
and its momentum is zero, no matter how much
mass it may have.</span>
A machine can never be 100% efficient because some work is always lost
due to the lack of materials or equipment that would convert work by 100%. It follows
the second law of entropy. The ideal engine is known as Carnot’s engine having
a 100% efficiency. So far, no engine has ever gotten to 100%.