Answer:
c
motorcycle, telephone, piano, lawn mower
Explanation:
Use half life equation:
A = A₀ (½)^(t / T)
where A is the final amount,
A₀ is the initial amount,
t is time,
and T is half life.
0.375 = 3 (½)^(1 / T)
0.125 = (½)^(1 / T)
(½)^3 = (½)^(1 / T)
3 = 1 / T
T = 1/3 hours
T = 20 minutes
Answer:
4.78 kg/m^2.
Explanation:
τ = Iα
Where,
τ = torque, around a defined axis (N∙m)
I = moment of inertia (kg∙m2)
α = angular acceleration
= 1.2 rad/s^2
τ = F * r
= 16.88 * 0.34
= 5.74 N.m
Therefore, I = 5.74/1.2
= 4.78 kg/m2
