Answer: 4.speed
Explanation:
In this case, we know that the cart remains at a constant 20km/h.
Now, one could say that "the velocity remains constant, because it always is 20km/h"
But remember that velocity is a vector, so this has a direction, and if the cart is going around a turn, then the direction of motion is changing, which tell us that there is acceleration.
But the module of the velocity, the speed, remains constant at 20km/h.
Then the correct option is 4, speed.
Answer:
36 grams of water
Explanation:
mass of H2O = 0.5 x 18 = 9g
Answer:
Waves transfer energy, not motion
The thermal efficiency is defined as follows
,
and the energy which is put into the system is
.
In your case
So
which gives an efficiency of
.
