Answer:
Explanation:
distance of shuttle from centre of the earth = radius of the orbit 
= 6300 + 300 = 6600 km 
= 6600 x 10³
Formula of time period of the satellite 
T = 2π R /v₀ , v₀ is orbital velocity 
v₀ = √gR , ( if height  is small with respect to radius )
T = 2π R /√gR 
= 2π√ R /√g
= 2 x 3.14 x √ 6600 x 10³ / √9.8
= 2 x 3.14 x 256.9 x 10 / 3.13
= 5154.41 s 
= 5154.41 / 60 minutes
= 85.91 m 
85.9 minutes. 
2 ) No of sunrise per day = no of rotation per day
= 24 x 60 / 85.9
= 16.76 
or 17 sunrises. 
 
        
             
        
        
        
Answer:
 gravitational force
 gravitational force
  electrostatic force
 electrostatic force
Explanation:
The forces that balloons may exert on each other can be gravitational pull due to the mass of the balloon membrane and the mass of the gas contained in each. This force is inversely proportional to the square of the radial distance between their center of masses.
The Mutual force of gravitational pull that they exert on each other can be given as:

where:
 gravitational constant
 gravitational constant  
 are the masses of individual balloons
 are the masses of individual balloons
 the radial distance between the  center of masses of the balloons.
 the radial distance between the  center of masses of the balloons.
But when  there are charges on the balloons, the electrostatic force comes into act which is governed by Coulomb's law.
Given as:
 
where:

 are the charges on the individual balloons
 are the charges on the individual balloons
R = radial distance between the charges.
 
        
             
        
        
        
Answer:
We know that the speed of sound is 343 m/s in air
we are also given the distance of the boat from the shore
From the provided data, we can easily find the time taken by the sound to reach the shore using the second equation of motion
s = ut + 1/2 at²
since the acceleration of sound is 0:
s = ut + 1/2 (0)t²
s = ut    <em>(here, u is the speed of sound , s is the distance travelled and t is the time taken)</em>
Replacing the variables in the equation with the values we know
1200 = 343 * t
t = 1200 / 343
t = 3.5 seconds (approx)
Therefore, the sound of the gun will be heard at the shore, 3.5 seconds after being fired
 
        
             
        
        
        
okay this is kinda easy 
<u>What is the gravitational field strength on the moon?</u>
The Moon has a gravitational field strength of 1.6 N/kg.
 
        
             
        
        
        
Answer: The correct answer is C.
2/10 is simplified to 1/5, that is the factor that changes.