Its a Net force of 21.41404
Answer:
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Explanation:
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.
C is your answer
A can’t be it Because it is Summer in the South Pole it cant be Summer in both South and North Pole or we would be in trouble
B can’t be it because it’s tilted toward the sun when it’s summer because it’s hot not cold there
D can’t be it because if the Northern Hemisphere were tilted towards the Sun it would be Summer there
...which means C is correct
<span>Work and energy are both measured in joules.</span>
<span>a. True
b. False
Energy is work basically waiting to be used up and work is extended energy.
</span>
Answer:
The correct answer is d
Explanation:
In this exercise they ask us which statement is correct, for this we plan the solution of the problem, this is a Doppler effect problem, it is the frequency change due to the relative speed between the emitter and the receiver of sound.
The expression for the Doppler effect of a moving source is
f ’= (v / (v- + v_s) f
From this expression we see that if the speed the sound source is different from zero feels a change in the frequency.
The correct answer is d