Light because they need light to grow
        
                    
             
        
        
        
Answer:
Ohms law states that current is directly proportional to the potential difference across the ends of a conductor provided that temperature and other factors kept constant

 
        
             
        
        
        
Answer:
A) T1 = 269.63 K 
T2 = 192.59 K
B) W = -320 KJ 
Explanation:
We are given;
Initial volume: V1 = 7 m³
Final Volume; V2 = 5 m³
Constant Pressure; P = 160 KPa
Mass; m = 2 kg
To find the initial and final temperatures, we will use the ideal gas formula;
T = PV/mR
Where R is gas constant of helium = R = 2.0769 kPa.m/kg
Thus;
Initial temperature; T1 = (160 × 7)/(2 × 2.0769) = 269.63 K
Final temperature; T2 = (160 × 5)/(2 × 2.0769) = 192.59 K
B) world one is given by the formula;
W = P(V2 - V1) 
W = 160(5 - 7)
W = -320 KJ
 
        
             
        
        
        
Answer:
0.00016 kg
Explanation:  
Given: 
Power = P = 1.2 × 10⁹ Watts
Power =  work done / Time 
efficiency = 0.30
Input power = 1.2 × 10⁹ / 0.30 =  4  × 10⁹ W
Energy =  4  × 10⁹ x 60 x 60 = 1.44 x 10¹³ joules 
E = m c² , where c is the speed of light and m is the mass.
⇒ mass = m = E / c²  = (1.44 x 10¹³) / (3 × 10⁸ )² 
                                    = 0.00016 kg