Answer:
81.6 ohm
Explanation:
For a cable type conductor, the resistance is given by the following formula:
Where:
The problem doesn't give us additional information about resistivity or the cross section of the wire, so let's assume:
Then, in this case, the resistance of the cable depends only on the length. Therefore, if its resistance was originally 27.2 ohms, if we triple its length, it makes sense that its new resistance is three times the original. Thus:
Answer:
(a) The force which works on the object at a rate 15.89 w.
(b) The velocity of the object when the power is -8.7 w is .
Explanation:
Work: The work on an object is the dot product of force that acts on the object and velocity of the object .
P = F.V
Dot product:
where the angle between a and bis θ
(a)
Given that,
and
The work on the object is
=
={(5.7)×(-2.3)+(-2.7)×0+(5.0×5.8)} w
=15.89 w
The instantaneous rate at which the force does work on the object is 15.89 w.
(b)
The velocity of the object consists of only a y component i.e the x component and y component are zero.
and
Let,
The power is -8.70 w.
∴ -8.70 =
⇒ - 8.70 = -2.7×a
⇒ a = 3.22
The velocity of the object is