Answer:
Frequency = Velocity / Wavelength = 100 m/s / 20 m = 5 s-1 or 5 Hz.
Explanation:
Answer:
There are 4,626 apples in the truck.
Explanation:
Mass of 5 apples = 1250
Mass of an apple = 
Mass of apples in the truck = 2550 lbs
1 lbs = 453.592 g

Let the number of apples with mass of 2550 lbs be a.


4,626.63 ≈ 4,626
So, there are 4,626 apples in the truck.
Hydrogen can be considered as a clean energy carrier similar to electricity. Hydrogen can be produced from various domestic resources such as renewable energy. ... Power generation,a hydrogen fuel cell generates electricity and gives off heat and water.
A) can enter from the surroundings, but cannot escape to the surroundings