In the exosphere, there is thin air, since it is the uppermost level in the atmosphere. It is made mostly of helium and hydrogen. But, traces of other gases such as atomic oxygen and carbon dioxide can also be found in the exosphere.
0 N. The net force is found through thinking of the quantities as scalar. If you want to think of north as positive, think of south as negative. Then add them. 100 + (-100) = 0N
Answer:
v = 64.14 m/s
Explanation:
First we are going to calculate the initial tension force in the wire.
How:

Where v: Wave's speed
T. Tension force
μ: Linear densityof the wire
Then:


Now we calculate the linear dilation of the copper, thus
ΔL = αLoΔT
Where α:The coefficient of linear expansion for copper
ΔL = 
The Young's modulus is defined like:

Where E : The Young's modulus
A: cross-sectional area
Then


and the speed of the wave when the temperature is lowered is:

Answer:
18.03 N
Explanation:
From the fiqure below,
Using parallelogram law of vector
R² = 15²+5²-2×5×15cos(180-60)
R² = 225+25-150cos120°
R² = 250-150(-0.5)
R² = 250+75
R² = 325
R = √325
R = 18.03 N
Hence the resultant force of the object is 18.03 N
The answer is A.68 degrees