Answer:
C
Explanation:
He was using visual clues to read the signs.
When water vaporizes into the air, it becomes humid out.
The fine horizontal scratches etched onto a bullet after it has been fired are called Striations.
<h3>What is Striations?</h3>
- Striations are the minute differences in the curve of the bullet's surface. The bullet and the gun barrel are the harder and softer materials, respectively, in firearms evidence.
- The striations left on the fired bullet are used as a comparison by firearm examiners.
- When a gun is discharged, the bullet blasts down the barrel where it strikes ridges and grooves, spinning and improving shot accuracy.
- These ridges cause striations in the bullet's soft metal by digging into it.
- An examiner analyses these distinctive markings to verify whether a given bullet was shot from a specific firearm.
- A barrel will produce individual markings in addition to a bullet's land and groove impressions as the projectile passes through.
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Answer:
Explanation:
I = Current = 500 kA
L = Length of wire = 180 m
m = Mass of train =
g = Acceleration due to gravity =
B = Magnetic field
The gravitational force and magnetic force will balance each other
The magnitude of the magnetic field needed to levitate the train is