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2 years ago

For an isolated system, the sum of the kinetic and potential energies

Physics

2 answers:

pickupchik [31]2 years ago

5 0

I think it B I hope this help

Elenna [48]2 years ago

4 0

I am pretty sure the answer to your question is B

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Residential building codes typically require the use of 12-gauge copper wire (diameter 0.205 cm) for wiring receptacles. Such ci

Alecsey [184]

Given Information:

Current = I = 20 A

Diameter = d = 0.205 cm = 0.00205 m

Length of wire = L = 1 m

Required Information:

Energy produced = P = ?

Answer:

P = 2.03 J/s

Explanation:

We know that power required in a wire is

P = I²R

and R = ρL/A

Where ρ is the resistivity of the copper wire 1.68x10⁻⁸ Ω.m

L is the length of the wire and A is the area of the cross-section and is given by

A = πr²

A = π(d/2)²

A = π(0.00205/2)²

A = 3.3x10⁻⁶ m²

R = ρL/A

R = 1.68x10⁻⁸*(1)/3.3x10⁻⁶

R = 5.09x10⁻³ Ω

P = I²R

P = (20)²*5.09x10⁻³

P = 2.03 Watts or P = 2.03 J/s

Therefore, 2.03 J/s of energy is produced in 1.00 m of 12-gauge copper wire carrying a current of 20 A

8 0

3 years ago

What is the velocity of the 100 kg cart at point b?

Gre4nikov [31]

I believe the answer is c

8 0

2 years ago

1. A 14-cm tall object is placed 26 cm from a converging lens that has a focal length of 13 cm.

AURORKA [14]

Answer:

a) Please find attached the required drawing of light passing through the lens

By the use of similar triangles;

The image distance from the lens = 26 cm

The height of the image = 14 cm

c) The image distance from the lens = 26 cm

The height of the image = 14 cm

Explanation:

Question;

a) Determine the image distance and the height of the image

b) Calculate the image position and height

The given parameters are;

The height of the object, h = 14 cm

The distance of the object from the mirror, u = 26 cm

The focal length of the mirror, f = 13 cm

The location of the object = 2 × The focal length

Therefore, given that the center of curvature ≈ 2 × The focal length, we have;

The location of the object ≈ The center of curvature of the lens

The diagram of the object, lens and image created with MS Visio is attached

From the diagram, it can be observed, using similar triangles, that the image distance from the lens = The object distance from the lens = 26 m

The height of the image = The height of the object - 14 cm

b) The lens equation is used for finding the image distance from the lens as follows;

$\dfrac{1}{u} + \dfrac{1}{v} = \dfrac{1}{f}$

Where;

v = The image distance from the lens

We get;

$v = \dfrac{u \times f}{u - f}$

Therefore;

$v = \dfrac{26 \times 13}{26 - 13} = \dfrac{26 \times 13}{13} = 26$

The distance of the image from the lens, v = 26 cm

The magnification, M =v/u

∴ M = 26/26 = 1, therefore, the object and the image are the same size

Therefore;

The height of the image = The height of the object = 14 cm.

5 0

2 years ago

A change in the size or shape of a substance is a ___________ change. physical, chemical, or nuclear?

Pachacha [2.7K]

The answer would be physical.

6 0

3 years ago

Daniel put water, sugar, and yeast into a balloon. Then he measured the mass of the balloon. He put the balloon in a warm place

Crank

During the period of 2 hours, the yeast ate the sugar, and generated Carbon-Dioxide gas and alcohol. This is the process that causes bread-dough to rise, and eventually produces stuff that can be distilled to concentrate the alcohol and make wine or whiskey.

-- If Daniel tied the neck of the balloon, so that nothing could get in r out during the 2 hours, then the mass of the balloon and everything inside it didn't change. The balloon may have inflated slightly ... due to the creation of gas inside that wasn't there before ... just like bread dough. But no mass was created or destroyed inside or outside of the balloon, and none got in or out.

-- If Daniel left the neck of the balloon open, then the mass of the balloon and its contents decreased slightly during the 2 hours. The yeast took carbon and oxygen from the sugar, and used them to make Carbon Dioxide gas. Then the gas flew out through the neck of the balloon to Freedom.

6 0

3 years ago