Answer is A
to determine an objects true motion, you need velocity, which requires direction, time and distance!
<h2>
Answer: B) It would be best to use a concave mirror, with the object to be ignited positioned halfway between the mirror and its center of curvature. </h2>
Explanation:
To start a fire it is more optimal to use a concave mirror than a plane mirror. This is because the concave mirror allows concentrating sunlight at a point (the focal point) on an object that acts as fuel and ignite the fire there.
For this it is necessary the object to be positioned between the center of curvature of the mirror and the mirror (its focus). Thus the rays of the Sun, when converging on the focus, will heat the object and make it burn.
Hence, the correct option is B.
Identifying the word that is described by each statements in the question is listed below:
- Evaporation
- Transpiration
- Hydrosphere
- Water Cycle
- Condensation
<h3>Meaning of Water </h3>
Water can be simply defined as any fluid or substance that is odurless, colorless and tasteless.
Water is a very important factor and substance that sustains life in humans and plants on earth.
Water tends to undergo different changes and processes in plant, animals and even as a substance on its own
In conclusion the above listed processes are all related to water.
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The dog is 85kg or 187lbs (pounds)
The conservation of the momentum allows to find the result of how the astronaut can return to the spacecraft is:
- Throwing the thruster away from the ship.
The momentum is defined as the product of the mass and the velocity of the body, for isolated systems the momentum is conserved. If we define the system as consisting of the astronaut and the evo propellant, this system is isolated and the internal forces become zero. Let's find the moment in two moments.
Initial instant. Astronaut and thrust together.
p₀ = 0
Final moment. The astronaut now the thruster in the opposite direction of the ship.
= m v + M v '
where m is propellant mass and M the astronaut mass.
As the moment is preserved.
0 = m v + M v ’
v ’= 
We can see that the astronaut's speed is in the opposite direction to the propeller, that is, in the direction of the ship.
The magnitude of the velocity is given by the relationship between the masses.
In conclusion, using the conservation of the momentun we can find the result of how the astronaut can return to the ship is:
- Throwing the thruster away from the ship.
Learn more here: brainly.com/question/14798485
