Answer:
<em>D. 20 N</em>
Explanation:
<em>Force</em><em> </em><em>=</em><em> </em><em>mass(</em><em>m)</em><em> </em><em>×</em><em> </em><em>acceleration</em><em> due</em><em> to</em><em> </em><em>gravity (</em><em>g)</em>
<em>Force </em><em>=</em><em> </em><em>2</em><em>k</em><em>g</em><em> </em><em>×</em><em> </em><em>1</em><em>0</em><em>m</em><em>/</em><em>s²</em>
<em>Force</em><em> </em><em>=</em><em> </em><em>2</em><em>0</em><em>N</em>
Work needed = 23,520 J
<h3>
Further explanation
</h3>
Given
height = 12 m
mass = 200 kg
Required
work needed by the crane
Solution
Work is the transfer of energy caused by the force acting on a moving object
Work is the product of force with the displacement of objects.
Can be formulated
W = F x d
W = Work, J, Nm
F = Force, N
d = distance, m
F = m x g
Input the value :
W = mgd
W = 200 kg x 9.8 m/s²x12 m
W = 23520 J
Answer:
time constant will decrease and steady state current will decrease on increasing the resistance
Explanation:
As we know that the EMF of cell is E which is used to connected across a resistor and an inductor.
So we will have
here we know that
now here we have
so if we increase the value of resistance of the wire then the time constant will decrease
and hence it will take less time to reach near the steady state value
also the steady state current will be smaller in that case
