It is the mathematical and conceptual framework for contemporary Elementary practical physicas. if that make sense to you.
Answer:
500 kW
Explanation:
Given that,
Energy of the train, E = 2 MJ = 2×10⁶ J
Time, t = 4 seconds
We need to find the power of the train. We know that,
Power = energy/time
So,

So, the power of the train is equal to 500 kW.
Answer:

Explanation:
Potential Energy= Kinetic Energy
Let
be the value of Kinetic Energy.
We know that

Make
the subject of the formula to get speed at the bottom of the hill.

The stronger the magnitude the higher<span> the attraction and or repulsion </span><span />
Answer:
a) 0.2399 mi³
b) 440.8 × 10³ Pounds
Explanation:
Given:
Volume of cumulus cloud, V = 1 km³
Liquid water content = 0.2 g/m³
Now,
a) 1 km =
thus,
1 km³ = 
1 km³ = 0.2399 mi³
Hence, volume of cloud in cubic miles is 0.2399 mi³
b)
Liquid water content = 0.2 g/m³
Now,
1 Km = 1000 m
thus,
1 km³ = 1000³ m³
Therefore,
Liquid water content in 1 Km³ of cloud = 0.2 g/m³ × 1000³ m³
= 200 × 10⁶ gram
or
= 200 × 10³ Kg
also,
1 kilogram = 2.204 pounds
Therefore,
200 × 10³ Kg = 200 × 10³ × 2.204 pounds = 440.8 × 10³ Pounds