Answer:
Resistance = 3.35* Ω
Explanation:
Since resistance R = ρ
whereas
resistivity is given for two ends. At the left end resistivity is whereas x at the left end will be 0 as distance is zero. Thus
At the right end x will be equal to the length of the rod, so
Thus resistance will be R = ρ
where A = π
so,
Answer:
T = 480.2N
Explanation:
In order to find the required force, you take into account that the sum of forces must be equal to zero if the object has a constant speed.
The forces on the boxes are:
(1)
T: tension of the rope
M: mass of the boxes 0= 49kg
g: gravitational acceleration = 9.8m/s^2
The pulley is frictionless, then, you can assume that the tension of the rope T, is equal to the force that the woman makes.
By using the equation (1) you obtain:
The woman needs to pull the rope at 480.2N