The moon has phases because as it orbits earth, which causes the portion we see during each different phase to be shown.
Answer:
The momentum of the two-block system is 18 kg-m/s
Explanation:
It is given that,
Mass of block A,
Mass of block B,
Velocity of block A,
Velocity of block B, (it is moving in opposite direction)
We need to find the momentum of two block system. It is given by the product of mass and velocity for both blocks i.e.
p = -18 kg-m/s
So, the momentum of two block system is 18 kg-m/s. Hence, this is the required solution.
Answer:
The required frequency = 0.442 Hz
Explanation:
Frequency
where;
Then;
However;
and;
mass
where;
Then;
replacing the values;
Answer: 22.8 g
Explanation:
1) density = mass / volume ⇒ mass = density × volume
2) density of magnesium = 1.74 g/cm³ (from internet)
3) volume of a block = length × width × depth
volume of the magnesium block = 2.5cm × 3.5 cm × 1.5 cm = 13.125 cm³
4) mass of the magnesium block = 1.74 g/cm³ × 13.125 cm³ = 22.8375 g.
Rounding to 3 significant figures, mass = 22.8 g ← answer
Geothermal and nuclear energy are derived from radioactive materials.
Wave energy, from the ocean, is derived from winds blowing over the ocean, which are derived from the Sun's uneven heating of the earth.
Biomass energy is from plants, which get energy through photosynthesis, derived from the Sun.