Physics, 21.12.2019 04:31 meg7211

6. a resistor is made out of a wire having a length l. when the ends of the wire are attached across the terminals of an ideal battery having a constant voltage v0 across its terminals, a current i flows through the wire. if the wire were cut in half, making two wires of length l/2, and both wires were attached across the terminals of the battery (the right ends of both wires attached to one terminal, and the left ends attached to the other terminal), how much current would the battery put out?

Answers: 3

Show answers

Answers

Answer from: Yailynn565

4 I

Explanation:

The initial resistance of the wire is given by:

$R=\frac{\rho L}{A}$

where

$\rho$ is the resistivity of the material

L is the length of the wire

A is the cross-sectional area of the wire

Since the resistance is proportional to the length of the wire, when the wire is cut in half, each wire will have half of the initial resistance:

$R' = \frac{\rho \frac{L}{2}}{A}=\frac{R}{2}$

Later, these two pieces of wire are connected in parallel to the battery (because the right ends of both wires are attached to one terminal, while the left ends are attached to the other terminal, so they are connected in parallel). Therefore, their total resistance will be:

$\frac{1}{R_T} = \frac{1}{R_1}+\frac{1}{R_2}=\frac{1}{R/2}+\frac{1}{R/2}=\frac{2}{R}+\frac{2}{R}=\frac{4}{R}\\R_T = \frac{R}{4}$

so the total resistance of the circuit will be 1/4 of the initial resistance.

The initial current in the circuit was given by Ohm's law:

$I=\frac{V}{R}$

Since the voltage V has not changed, the new resistance will be

$I' = \frac{V}{R_T}=\frac{V}{R/4}=4 \frac{V}{R}=4I$

so, the current will increase by a factor 4.

Answer from: Quest

Velocity is the speed of an object in a certain direction so you'd need to know speed and direction

Answer from: Quest

m₁v₁ + m₂v₂ = (m₁ + m₂)vmomentum is conserved.the left-hand side of the equation represents the momentum in the system before the collision.the right-hand side represents the momentum in the system after the collisionm₁ and v₁ represents the mass and the velocity of the physics blockm₂ and v₂ represents the mass and velocity of the ball of puttyv represents the final velocity of the combined mass.the question states the two masses stick together. they combined mass has its own velocity with the body mass the sum of the two objects' massestheir combined momentum is (m₁ + m₂)vto find the magitude of (m₁ + m₂)v, we need to add the vectors on the left-hand side of the equation: m₁v₁ + m₂v₂.note the diagram. i have positioned the vectors in accordance with their directions.the magnitude of the resultant can be calculated using the pythagorean theorem since this is a right triangle situation (north and west are perpendicular)|(m₁ + m₂)v| = √[ (m₁v₁)² + (m₂v₂)² ]|(m₁ + m₂)v| = √[ (1.5kg·8.0m/s)² + (0.40kg·20m/s)² ]|(m₁ + m₂)v| = 14.4 kg m/sfor two significant figures (assuming that 20m/s is two), this rounds to 14 kg m/s

Another question on Physics

Physics, 21.06.2019 21:20

Jason is a body builder. despite being more fit, he weighs more than his brother ryan, who is the same height. which is a possible reason? a. jason has more muscle mass than ryan does. b. jason has more body fat than ryan does. c. jason has more muscle mass and body fat than ryan does d. jason has less body fat than ryan does.

Answers: 1

Answer

Physics, 22.06.2019 01:00

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

Answers: 1

Answer

Physics, 22.06.2019 09:00

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

Answers: 2

Answer

Physics, 22.06.2019 11:00

Which of the following are guidelines to follow for obtaining accurate observations

Answers: 2

Answer

You know the right answer?

6. a resistor is made out of a wire having a length l. when the ends of the wire are attached across...