Author Question: Which of the following cylindrical wires has the largest resistance? All wires are made of the same ... (Read 83 times)

jman1234 · **on:** Jul 29, 2018

Which of the following cylindrical wires has the largest resistance? All wires are made of the same material.

A)

a wire of length L and diameter 2d
B)

a wire of length L and diameter d/2
C)

a wire of length L/2 and diameter d
D)

a wire of length L and diameter d
E)

a wire of length L/2 and diameter 2d

Question 2

A person pushes on a doorknob with a force of 5.00 N. The direction of the force is at an angle of 20.0 from the perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the hinges of the door.

The door begins to rotate with an angular acceleration of 2.00 rad/s2. What is the moment of inertia of the door about the hinges? A)

4.28 kgm2

B)

7.52 kgm2

C)

1.88 kgm2

D)

0.684 kgm2

E)

2.74 kgm2