Answer:
A. Argon
Explanation:
It is a noble gas, a group which is not reactive.
 
        
             
        
        
        
Answer:
The deceleration is 0.18 m/s²
Explanation:
Hi there!
Using Newton´s second law, we can calculate the deceleration:
∑F = m · a
Where:
∑F = the sum of all forces in a given direction.
m = mass of the object.
a = acceleration.
Solving for a:
∑F/m = a
The only force acting on the meteor is the applied force of 8.6 N. So, the acceleration will be:
8.6 N / 48.9 kg = a
a = 0.18 m/s²
The deceleration is 0.18 m/s² or, in other words, the acceleration is -0.18 m/s²
Have a nice day!
 
        
             
        
        
        
Answer:
7 hours
Explanation:
The total charge contained in the battery is

And this is a charge, since it is a current multiplied by a time:

The current drawn by each headlight (which is the charge consumed per second) is

Since we have two headlight, the total current drawn is

Therefore, the total charge consumed by the two headlights each hour is

So, the time before the battery is dead is

 
        
             
        
        
        
Answer:
28.57 cm
Explanation:
We are given that 
Focal length,
Distance of application from his eyes,s=40 cm




s=25 cm
Substitute the values 




 
        
             
        
        
        
Answer:(1) Pre-solar nebula
(2). Planet formation 
Explanation:
Nebular hypothesis says that the Solar System formed from the gravitational collapse of a fragment of a giant molecular cloud. 
One of the collapsing fragments called the pre-solar nebula formed what became the Solar System.
The planet can also be formed by accretion. Accretion is a process in which planets began as dust grains in orbit around the central protostar.
When the terrestrial planets were forming, they remained immersed in a disk of gas and dust.