Four divalent elements A, B, C and D are as shown below, the greatest electromotive force of a cell can be formed of two of these elements equals ……………. A àA2+ + 2e- E0 = 1.029 V B2+ + 2e- à B E0 = -0.126 V C2+ + 2e- à C E0= 1.200 V DàD+ + e- E0= 3.045 V

14 days is the half-life of phosphorus-32

10 years is the answer

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied