Identify the electromagnets with poles that are reversed from the electromagnet shown above

Answer:

When acted upon by a force.

Explanation:

"If a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force."

Answer:

electrical conductors help electric current to pass through it

electrical conductors are usually made of any metal

electrical insulator don't help electric current to pass through it

electrical insulators are made of non metals

hope it helped you

Explanation:

conductors allows free flow of electrons from one atom to another.

insulators restrict free flow of electrons

conductors allow electrical energy to pass through them

insulators do not allow electrical energy to pass through them

Answer:

The answer is the sound waves can travel through some material (not all) and visible light cannot.

Explanation:

I did this question on study island so I know the answer.

Answer:

the answer is: sound can be transmitted through the walls, but visible light cannot.

Explanation:

Answer:

The answer is “global demand for ivory”

Explanation:

Answer:

a. Work done = 313.92 Joules

b. Work done = 439.49 Joules

Explanation:

Work done = Force x distance

Where: Force = mass x gravity

Thus,

Work done = Force x gravity x distance

The earth's acceleration to gravity = 9.81 m/[tex]s^{2}[/tex].

a. The work done as it goes from B to A can be determined as;

work done = 4 x 9.81 x 8

                  = 313.92 Joules

b. The distance between A and C is the total horizontal distance covered from A to C.

i.e 8 + 3.2 = 11.2 m

The work done as the ball goes from point A to C can be determined as:

work done = 4 x 9.81 x 11.2

                  = 439.488

work done = 439.49 Joules

Explanation:

A. Up along the page

Using the law of the right hand

Answer:

0.05 m/s

Explanation:

We start by finding the average velocity of water in the pipe. This is done by saying

R(e) = ρv(avg)d/μ

Where,

R(e) = Reynolds number, and that's 2000

ρ = Density of water, 1000 kg/m³

μ = Viscosity of water, 10^-3

d = diameter of pipe

v(avg) = average velocity

Since we're interested in average velocity, we make v(avg) the subject of formula. So that

V(avg) = R(e).μ/ρ.d

V(avg) = 2000 * 10^-3 / 1000 * 0.08

V(avg) = 2 / 80

V(avg) = 0.025 m/s

The maximum flow rate of water in the pipe usually is twice the average velocity, and as such

V(max) = 2 * V(avg)

V(max) = 2 * 0.025

V(max) = 0.05 m/s

Answer:17: A wave can be defined as follows: It is important to realize that a wave is quite a different object than a particle. A baseball thrown though a window transfers energy from one point to another, but this involves the movement of a material object between two points.

Explanation:

18: In this way, we classify waves into electromagnetic and mechanical waves. The main difference between mechanical and electromagnetic waves is that electromagnetic waves do not require a medium to propagate whereas mechanical waves require a medium in order to propagate.

Answer:

Option (a) is correct

Explanation:

The acceleration of an object is defined as the rate of change of velocity. Mathematically, it can be written as :

[tex]a=\dfrac{v-u}{t}[/tex]

Where

v and u are final and initial velocity

It is clear that if there is some change in velocity, it means the object is experiencing either acceleration or deceleration. Hence, the correct option is (a).

Answer:

a

Explanation:

Answer: Radioactive decay is the breakdown of a material into stable isotopes which are used for determining the age of the ancient material.

Explanation:

The radioactive decay is a natural process in which an ancient or old material whether in the form of rock, object or fossil break down into elements. Carbon 14 is an unstable isotope which decays to produce stable elements, the dating procedure uses these stable elements and the rate of decay of the isotopes to determine the age of absolute ancient of the objects but exact age cannot be determined just an approximation can be accepted.

Answer:

The body systems that work together to maintain the energy Sierra needs are;

The digestive system, the respiratory system, and the circulatory system

Explanation:

Cellular respiration in the body cells require oxygen to produce energy which are used by the muscles and other body cells. Carbon dioxide is also produced and is the build up of carbon dioxide has to be removed from the body as the by product of cellular respiration which is toxic at the cell level

Therefore, the body systems that work together to maintain the energy Sierra needs are;

The digestive system; Takes in the energy containing food and brakes them into chemicals that are transported to the cells for cellular respiration

The respiratory system; Takes in oxygen and removes carbon dioxide from the blood from and to the atmosphere

The circulatory system; Supplies food and oxygen from the digestive and respiratory system to the cells and transports produced carbon dioxide from the cells to the lungs from where it is passed out of the body by th respiratory system.

Answer:

80 feet per mile

Explanation:

Given that a the elevation of the head of a stream is at 900 feet, and the elevation of the mouth of the stream is 500 feet, and the distance between the two points is 20 miles, and the meandering stream flows 25 miles between those points, what is the gradient of the stream?

The gradient will be calculated by using the formula

M = change in feet ÷ change in miles

Where

M = gradient of the stream.

Change in feet = 900 - 500 = 400 feet

Change in miles = 25 - 20 = 5 miles

M = 400 / 5

M = 80

Therefore, the gradient of the stream is 80 ft per mile

Explanation:

The potential energy of the roller coaster is due to its position. It can be calculated as :

P = mgh

Where

m is mass, g is acceleration due to gravity and h is height.

The kinetic energy of an object is given by :

[tex]K=\dfrac{1}{2}mv^2[/tex]

Where

v is the speed of the object

At lowest point, the potential energy of the roller coaster is converted to the kinetic energy. So, At the bottom of the slope kinetic energy is at its maximum value and potential energy is at its minimum value. That's why the speed of the cars is at the lowest points in the ride.

We have that for the Question "Which statement explains why the fastest speeds of the car will be at the lowest points in the ride?"

option a explains why the fastest speeds of the car will be at the lowest points in the ride because potential energy decreases with decrease in height. Here the decreased potential energy is converted to the kinetic energy.

For more information on this visit

https://brainly.com/question/23379286

Answer:

Newton's Law 2

Hope this helps!

Answer:

Explanation:

The main reason for doing this is to get the attention of the tertiary institutions early. There are thousands of students that apply to these institutions every year, depending on the strictness of the acceptance of these institutions it may or may not be difficult for you to enter. Applying while at grade 11 gives you more chances of getting in as you are catching the attention of the institution and showing a high level of interest. This also allows you more chances to enter, since if you are denied you can try again next year. Aside from this, some institutions have specific requirements, applying early can allow you to know what you are missing as they will tell you if you get denied. You can then work towards obtaining these requirements and apply next year.

Answer:

Explanation:

The autonomic nervous system has two components, the sympathetic nervous system and the parasympathetic nervous system. The sympathetic nervous system functions like a gas pedal in a car. It triggers the fight-or-flight response, providing the body with a burst of energy so that it can respond to perceived dangers.

Answer:

Earth: [tex]t = 498.667\,s[/tex], Mercury: [tex]t = 193\,s[/tex], Pluto: [tex]t = 19700\,s[/tex]

Explanation:

The light travels at a constant speed of approximately [tex]3\times 10^{8}[/tex] meters per second. The time ([tex]t[/tex]), in seconds, required for light to travel a given distance is:

[tex]t = \frac{x}{v_{l}}[/tex] (1)

Where:

[tex]x[/tex] - Travelled distance, in meters.

[tex]v_{l}[/tex] - Speed of light, in meters per second.

Now, we calculate the time for light to travel to each planet:

Earth ([tex]v_{l} = 3\times 10^{8}\,\frac{m}{s}[/tex], [tex]x = 1.496\times 10^{11}\,m[/tex])

[tex]t = \frac{x}{v_{l}}[/tex]

[tex]t = 498.667\,s[/tex]

Mercury ([tex]v_{l} = 3\times 10^{8}\,\frac{m}{s}[/tex], [tex]x = 5.79\times 10^{10}\,m[/tex])

[tex]t = \frac{x}{v_{l}}[/tex]

[tex]t = 193\,s[/tex]

Pluto ([tex]v_{l} = 3\times 10^{8}\,\frac{m}{s}[/tex], [tex]x = 5.91\times 10^{12}\,m[/tex])

[tex]t = \frac{x}{v_{l}}[/tex]

[tex]t = 19700\,s[/tex]

Answer:

it's b the moon reflect light from the sun

Answer:

Answer is B

Explanation:

Answer:

B. Frequency

Explanation:

Answer:

because it get the energy from the heat and the cold mixed together

Explanation:

Answer: Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations. Most metals become cations when they make ionic compounds.

Explanation: hope this helps

Answer:

19.6 cm.

Explanation:

From the question given above, the following data were obtained:

Focal length (f) = 13.8 cm

Magnification (M) = +2.37

Object distance (u) =.?

Next, we shall determine the image distance. This can be obtained as follow:

Magnification (M) = +2.37

Object distance (u) = u

Image distance (v) =?

M = v / u

2.37 = v / u

Cross multiply

v = 2.37 × u

v = 2.37u

Finally, we shall determine the object distance. This can be obtained as follow:

Focal length (f) = 13.8 cm

Image distance (v) = 2.37u

Object distance (u) =.?

1/v + 1/u = 1/f

vu / v + u = f

2.37u × u / 2.37u + u = 13.8

2.37u² / 3.37u = 13.8

Cross multiply

2.37u² = 3.37u × 13.8

2.37u² = 46.506u

Divide both side by u

2.37u² / u = 46.506u / u

2.37u = 46.506

Divide both side by 2.37

u = 46.506 / 2.37

u = 19.6 cm

Thus, the lens should be held at a distance of 19.6 cm.

Answer:

potential energy

Explanation:

Answer:

The correct answer is ii) It must revolve around a star

Explanation:

For a celestial body to be called a planet, it must meet at least three characteristics

* rotate around a star

* its mass must be sufficient to maintain hydrostatic equilibrium

* have control over its orbital that is to say to prevent that other body is in its same orbital

if we check the different proportions

i) False. Most of the planets are spheres deformed by their rotation on themselves and around the star

ii) True. It is in accordance with the minimum characteristics of the plants

iii) False .. the orbit of the planet can be elliptical and the speed changes at each point for this at a different distance from the star that is in a focus of the ellipse.

The correct answer is ii) It must revolve around a star

Answer:

V= 0.25L

Explanation: