Answer:
what? i cant understand you pls translate in English
Answer:
287.19 kg.m²
Explanation:
Given that :
The mass M of the horizontal platform = 111 kg
The radius R of the uniform disk = 1.67 m
mass of the person standing
= 64.7 kg
distance of the person standing
= 1.15 m
mass of the dog
= 25.7 kg
distance of the dog
= 1.35 m
Considering the moment of inertia of the object in the system; the net moment of the inertia can be expressed as:
= 
= 
= 287.19 kg.m²
D is the correct answer on that
Answer:
The kinetic energy of the electron is
.
Explanation:
Given that,
The maximum wavelength of a photon is 430 nm.
The frequency of a photon is 
It is a case of photoelectric effect. The relation between the kinetic energy and the the work function as :

So, the kinetic energy of the electron is
.