What is an exothermic chemical reaction? A. It is a reaction that converts matter to heat. B. It is a reaction that requires hea
2 answers:
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Answer:
(v-u) = 1.27 m/s
Explanation:
Given that,
Mass of a car, m = 1100 kg
Force with which the wall strikes, F = 4000 N
Time, t = 0.35 s
We need to find the change in velocity of the car.
The net force acting on the car is given by :
F = ma
a is acceleration
(v-u) is the change in velocity. Hence, the change in the velocity of the car is 1.27 /s.
391.12 * mass is required for activity of 315 ci
The activity of the radioactive substance is the number of disintegrations taking place in a radioactive sample.
Isotopes are the members of an element having the same number of protons but the different number of neutrons.
the activity of the radioactive sample is given as:
A = λ * N
where λ is the decay constant and N is the number of disintegrations.
activity is given as 315 ci
A = 315 * 3.7 *
= 1165.5 * Bq
λ = 0.693 /
= 0.693 / 2.69 * 24 * 3600
= 2.98 * t^-1
Therefore, N = A / λ
= 1165.5 * / 2.98 *
N = 391.12 *
391.12 * mass is required for activity of 315 ci
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