Answer:
The answer to the question is as follows
The  acceleration due to gravity for low for orbit is  9.231 m/s² 
Explanation:
The gravitational force is given as 

Where  = Gravitational force
 = Gravitational force
G = Gravitational constant = 6.67×10⁻¹¹
m₁ = mEarth = mass of Earth = 6×10²⁴ kg 
m₂ = The other mass which is acted upon by   and = 1 kg
 and = 1 kg
rEarth = The distance between the two masses = 6.40 x 10⁶ m
therefore at a height of 400 km above the erth we have
r = 400 + rEarth = 400 + 6.40 x 10⁶ m = 6.80 x 10⁶ m
and   =
 =  = 9.231 N
 = 9.231 N
Therefore the acceleration due to gravity =   /mass
 /mass  
9.231/1 or 9.231 m/s² 
Therefore the acceleration due to gravity at 400 kn above the Earth's surface is  9.231 m/s² 
 
        
                    
             
        
        
        
1. The velocity decreases, and the kinetic energy decreases.
2. An increase in temperature difference between the inside and outside of the building.
3. The total kinetic energy remains the same.
4. 76,761 J
5. The energy loss must increase.
 
        
             
        
        
        
Answer:
v = 10 m/s
Explanation:
recall that velocity is related to wavelength and frequency by the formula
v = fλ
where v = velocity, f = frequency and λ= wavelength
Simply substitute these into the formula:
v = fλ
v = (0.5)(20)
v = 10 m/s
 
        
                    
             
        
        
        
Answer:C
Explanation:
Do bubbles form when the element is mixed with an acid