I would use miles
Because miles will give you less of an answer
        
             
        
        
        
Answer:
Explanation:
Given that:
mass of stone (M) = 0.100 kg
mass of bullet (m) = 2.50 g = 2.5  ×10 ⁻³ kg
initial velocity of stone ( ) = 0 m/s
) = 0 m/s
Initial velocity of bullet ( ) = (500 m/s)i
) = (500 m/s)i
Speed of the bullet after collision ( ) = (300 m/s) j
) = (300 m/s) j
Suppose we represent  to be the velocity of the stone after the truck, then:
 to be the velocity of the stone after the truck, then:
From linear momentum, the law of conservation can be applied which is expressed as:





∴
The magnitude now is: 


Using the tangent of an angle to determine the direction of the velocity after the struck;
Let θ represent the direction:


 
        
             
        
        
        
Answer:
6.00 x 10⁻⁸N
Explanation:
Given parameters: 
Mass of each dump trucks  = 1500kg 
Distance between them  = 50m 
Unknown: 
New gravitational force between them = ? 
Solution: 
From Newton's law of universal gravitation, 
         F =  
   
F is the gravitational force 
G is the universal gravitation constant
m is the mass
r is the distance 
            F  =  = 6.00 x 10⁻⁸N
    = 6.00 x 10⁻⁸N
 
        
             
        
        
        
Answer:
(a) 
(b) P =  0.816 Watt
Explanation:
(a)
The power radiated from a black body is given by Stefan Boltzman Law:

where,
P = Energy Radiated per Second = ?
σ = stefan boltzman constant = 5.67 x 10⁻⁸ W/m².K⁴
T = Absolute Temperature
So the ratio of power at 250 K to the power at 2000 K is given as:

(b)
Now, for 90% radiator blackbody at 2000 K:

<u>P =  0.816 Watt</u>