Answer:
t = 17199 years
Explanation:
given,
mass of sample = 1.09 Kg
Activity of living material = 15 decays / min /g
Activity of living material = 15 x 1000 decays /min /kg
Activity of living material per 1.09 kg A = 1.09 x 15 x 1000 decays / min
Activity of after time t is A ' = 2020
half life = 57300 years
desegregation constant
λ = 0.693 / 5700




taking ln both side

t = 17199 years
Answer:
382.74 kJ.
Explanation:
The work that must be done to stop an 1100 kg car travelling at 59 km/h is - 382.74 kJ.
Answer:
B) 40 km West
Explanation:
Let position of B is origin so with respect of City B the position of A is given as
south of city B
now Bus starts from City A and travels a distance of 50 km at 37 degree North of East to reach city C
so it is


now the position of C is given with respect to A
in order to find the position of C with respect to B we can say



so in order to reach at city B from city C bus has to travel 40 km towards West
One protons and also it grouped their because how it reacts with other materials such as other substances or materials