The length of a certain wire is doubled while its radius is kept constant. What is the new resistance of this wire?
A) It stays the same.
B) It is 2 times as large.
C) It is 3 times as large.
D) It is 4 times as large.
E) It is 1/2 as large.
B
You might also like to view...
A loop of wire is situated inside a large solenoid, with the plane of the loop initially perpendicular to the axis of the solenoid. Current can be made to flow through the loop of wire if
A) a constant current is flowing through the solenoid wire. B) the current flowing through the solenoid is decreasing with time. C) the loop of wire is rotating within the solenoid, and a constant current is flowing through the solenoid wire. D) All of the above statements are true. E) Only two of the above statements are true.
Moment of Inertia: The L-shaped object shown in the figure consists of three small masses connected by extremely light rods. Assume that the masses shown are accurate to three significant figures. What is the moment of inertia of this object (a) about the x-axis, and (b) about the y-axis?
What will be an ideal response?
When a 6-kg object increases its potential energy by 180 J, approximately how has its position changed?
a. It has risen vertically 3 m. b. It has fallen vertically 3 m. c. It has risen vertically 30 m. d. It has moved horizontally 30 m.
Is it possible for a system to have negative potential energy?
A) Yes, as long as the kinetic energy is positive. B) Yes, as long as the total energy is positive. C) Yes, since the choice of the zero of potential energy is arbitrary. D) No, because the kinetic energy of a system must equal its potential energy. E) No, because this would have no physical meaning.