It is D. An object can acquire a net charge only when charges are transferred to or from it.
Answer:
Explanation:
Due to change in the position of 3 kg mass , the moment of inertia of the system changes , due to which angular speed changes . We shall apply conservation of angular momentum , because no external torque is acting .
Initial moment of inertia I₁ = M R² = 3 x 1 ² = 3 kg m²
Final moment of inertia I₂ = M R² = 3 x .3 ² = 0.27 kg m²
Applying law of conservation of angular momentum
I₁ ω₁ = I₂ ω₂
Putting the values ,
3 x .75 = .27 x ω₂
ω₂ = 8.33 rad / s
New angular speed = 8.33 rad /s .
<span>Jean Piaget is the person who studied cognitive development extensively.
According to the Piaget, the </span>building of schema consists of <span>assimilation and accommodation.
There are 4 stages in </span>cognitive development of Piaget's theory as <span>Sensorimotor, Pre-operational, Concrete-operational, and Formal-operational.
</span><span>The psycologist who introduced the theory of sociocultural cognitive development is </span><span>Lev Semenovich </span><span>Vygotsky.
</span>Authoritative is a parenting style that <span>rules are not set in stone and childrens’ ideas and concerns are listened to.
The </span>theory of psychosocial developments which was developed by <span>Erik Erikson has 8 stages.</span>
