Solids are the best at conducting heat. 
        
                    
             
        
        
        
K = C + 273, so 27°C = 27+273 = 300 K
1 dg = 100 mg, so 20 dg = 20×100 = 2,000 mg
        
             
        
        
        
Heat rises therefore the heat from the fire rises up to your hand... i didnt have any answer choices to work with sorry
        
                    
             
        
        
        
M = mass of the first sphere = 10 kg 
m = mass of the second sphere = 8 kg 
V = initial velocity of the first sphere before collision = 10 m/s 
v = initial velocity of the second sphere before collision = 0 m/s 
V' = final velocity of the first sphere after collision = ?
v' = final velocity of the second sphere after collision = 4 m/s 
using conservation of momentum 
M V + m v = M V' + m v'
(10) (10) + (8) (0) = (10) V' + (8) (4)
100 = (10) V' + 32
(10) V' = 68
V' = 6.8 m/s