<h2>
Answer: dark matter</h2>
It is believed that the Milky Way has 90% dark matter and only 10% ordinary matter (known matter). Because, like gravity, <u>dark matter can not be observed directly</u>, however its existence is inferred through the movement of the stars and the cosmic dust within the galaxy.
It is important to note that dark matter composition is unknown and corresponds to 80% of the matter in the universe. It does not emit or interact with any type of electromagnetic radiation, but it interacts with the known matter through gravity.
Answer:
Explanation:
Given that,
Velocity of the airplane, v = 240 m/s
Angle with horizontal, 
The altitude of the plane is 2.4 km, d = 2400 m
Vertical speed of the airplane, 
Horizontal speed of the airplane, 
So, the equation of the projectile for the flare is given by :
On solving the above equation, we get the value of t as:
t = 13.04 seconds
Horizontal distance travelled,
d = 2710.23 m
Let 
is the angle with which it hits the target. So,
Hence, this is the required solution.
-55 C to F is -67.
I hope this helps you!
Brainliest answer is always appreciated!
U = 0, the initial vertical velocity
Assume g = 9.8 m/s² and ignore air resistance.
Use the formula
v = u + gt
where v = vertical velocity after t seconds.
That is,
v = 0 + (9.8 m/s²)*(10 s) = 98.0 m/s
Answer: 98.0 m/s
Answer:
0.44
Explanation:
Poisson's ratio is:
ν = (3K − E) / 6K
where K is the bulk modulus and E is Young's modulus.
Young's modulus is:
E = FL / (AΔL)
where F is the force, L is the initial length, A is the cross sectional area, and ΔL is the change in length.
E = (20 kg × 9.8 m/s²) (1.7 m) / (π (0.02 m)² × 0.0005 m)
E = 0.530×10⁹ Pa
Bulk modulus is:
K = -ΔP / (ΔV/V)
where ΔP is the change in pressure, ΔV is the change in volume, and V is the initial volume.
K = -(180 atm × 101325 Pa/atm) / (-0.012)
K = 1.52×10⁹ Pa
Therefore, the Poisson's ratio is:
ν = (3(1.52×10⁹ Pa) − 0.530×10⁹ Pa) / 6(1.52×10⁹ Pa)
ν = (3(1.52) − 0.530) / 6(1.52)
ν = 0.442
Rounded to 2 significant figures, the Poisson's ratio is 0.44.
