True
False

PLEASE HELP

Answer:

B IS CORRECT

Explanation:

Answer:

theyre used to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.

Explanation:

Metal cables are conductor of electricity but plastic rubber coating is insulator and can not conduct current. To avoid unnecessary flow of current and safely current transmission,  this material surrounds the metal cable.

Materials that easily permit the flow of electricity are referred to be electrical conductors. Conductivity is the quality of conductors that enables them to conduct electricity.

Insulators are substances that prevent electrons from freely moving from one elemental particle to another. The charge stays in the same spot and does not spread across the surface if we transfer any quantity of charge to such an element at any time.

Copper, aluminum, gold, and silver are a few examples of common conductors. Wood, rubber, plastic, and glass are a few typical insulators.

Learn more about insulator here:

https://brainly.com/question/2619275

#SPJ2

Answer:

Rheostat, adjustable resistor used in applications that require the adjustment of current or the varying of resistance in an electric circuit. The rheostat can adjust generator characteristics, dim lights, and start or control the speed of motors.

Explanation:

Question:

A roller-coaster vehicle has a mass of 500 kg when fully loaded with passengers.  If the vehicle has a speed of 20.0 m/s at point A, what is the force exerted by the track on the vehicle at this point?

See attachment

Answer:

33700 Newton

Explanation:

Given

[tex]m = 500kg\\v = 24.0m/s\\r=10m[/tex]

First, we determine the forces acting on mass m.

They are: the force exerted by the track (Fn) and the weight of the vehicle (W)

So, the net force is:

[tex]F_{net} = F_n - W[/tex]

[tex]W=mg[/tex]

So:

[tex]F_{net} = F_n - mg[/tex]

Make Fn the subject

[tex]F_n = F_{net} + mg[/tex]

Fnet is calculated as:

[tex]F_{net} = F_c = \frac{mv^2}{r}[/tex] --- i.e. the centripetal force

So:

[tex]F_n = F_{net} + mg[/tex]

[tex]F_n = \frac{mv^2}{r} + mg[/tex]

[tex]F_n = \frac{500 * 24^2}{10} + 500 * 9.8[/tex]

[tex]F_n = 28800 + 4900[/tex]

[tex]F_n = 33700N[/tex]

Answer:

d) 40000 kgm/s

Explanation:

The formula for momentum is p = m*v

so p = 100*400

p = 40000 kgm/s

you can serve to anyplace over the net

Answer:

127

Explanation:

f(n)=mg

(13)*(9.81)

127.4N

Answer:

The electrically charged gas particles are affected by magnetic forces.

For the past eleven years, the Sun's north geographic pole has also been home to its north magnetic pole

Explanation:

Answer:

Work hasn't been done by Michael because no distance was covered.

Explanation:

Workdone is given by the formula;

[tex] Workdone = F * s[/tex]

Where;

W is the work done

F represents the force acting on a body.

s represents the distance covered by the body.

Hence, work hasn't been done by Michael because no distance was covered, as the table didn't move at all. Therefore, work done is zero.

Answer:

Llegara a su destino a la 1:00 pm

Explanation:

Si el coche va a 90 km/h buscamos un numero q al multiplicarlo por 90 nos de 450. Entonces 90×5 = 450, si hacemos la cuenta desde las ocho de la mañana mas las 5 horas del viaje terminaria llegando a su destino a la 1:00 pm.

Answer:

im 99% sure its initial disturbance

Explanation:

Answer:

it can contaminate the water

Explanation:

I hope this helps ;)

Answer:

The magnitude of the force required to move the electron through the given field is 2.203 N

Explanation:

Given;

The field strength of the electron, E = 1.375  x 10¹⁹ N/C

charge of electron, q = 1.602 x 10⁻¹⁹ C

The magnitude of the force required to move the electron through the given field is calculated as follows;

F = Eq

F = (1.375  x 10¹⁹ N/C) (1.602 x 10⁻¹⁹ C)

F = 2.203 N

Therefore, the magnitude of the force required to move the electron through the given field is 2.203 N

Answer:

A pushing force example could be a button, like on a keyboard.

Another example would be a piston.

An example of a pulling force could be a lever.

Another example could be rope.

Hope this helps! c:

Answer:

its very simple this list the items that you have in your house that have electric energy

Explanation:

A planetesimal is an object formed from dust, rock, and other materials. According to the planetesimal hypothesis, when a planetary system is forming, there is a protoplanetary disk with materials from the nebulae from which the system came. This material is gradually pulled together by gravity to form small chunks.

Brainliest or a thank you please :)) <3

The book has potential energy and the bike has kinetic.

kinetic energy is energy possessed when a object is in motion. The bike is moving. Therefore, it has kinetic energy. The book isn't moving. Hopefully that helped

Answer:

The crown is not made of solid gold.  

Explanation:

Density ρ = M/V.  M and V are given.

The density of the crown is (0.5 kg)/(185 cm3) * (106 cm3)/(1 m3) = 2.7*103 kg/m3.

Answer:

If the passengers were not wearing their seat belts:, then the passengers in motion would continue in motion. Assuming a negligible amount of friction between the passengers and the seats, the passengers would likely be propelled from the car and be hurled into the air. Once they leave the car, the passengers becomes projectiles and continue in projectile-like motion.

If they were: Any passengers in the car will also be decelerated to rest if they are strapped to the car by seat belts. Being strapped tightly to the car, the passengers share the same state of motion as the car. As the car accelerates, the passengers accelerate with it; as the car decelerates, the passengers decelerate with it; and as the car maintains a constant speed, the passengers maintain a constant speed as well.

I got this from https://www.physicsclassroom.com

Answer:

Because in higher altitudes atmospheric pressure is low

Answer:

La masa del objeto es 270.027 kilogramos.

Explanation:

Asumamos que el cuerpo decelera a tasa constante, entonces podemos calcularlo por medio de la siguiente ecuación cinemática:

[tex]a = \frac{v-v_{o}}{t}[/tex] (1)

Donde:

[tex]v_{o}[/tex] - Velocidad inicial, en metros por segundo.

[tex]v[/tex] - Velocidad final, en metros por segundo.

[tex]t[/tex] - Tiempo, en segundos.

[tex]a[/tex] - Deceleración, en metros per segundo al cuadrado.

Si sabemos que [tex]v_{o} = 33.889\,\frac{m}{s}[/tex], [tex]v = 13.889\,\frac{m}{s}[/tex] y [tex]t = 4.5\,s[/tex], entonces la deceleración experimentada por el cuerpo es:

[tex]a = \frac{v-v_{o}}{t}[/tex]

[tex]a = -4.444\,\frac{m}{s^{2}}[/tex]

Por las Leyes de Newton, tenemos que la masa del cuerpo se calcula a partir de la siguiente expresión:

[tex]m = \frac{F}{a}[/tex] (2)

Donde:

[tex]m[/tex] - Masa, en kilogramos.

[tex]F[/tex] - Fuerza de frenado, en newtons.

Si sabemos que [tex]F = -1200\,N[/tex] y [tex]a = -4.444\,\frac{m}{s^{2}}[/tex], entonces la masa del cuerpo es:

[tex]m = \frac{F}{a}[/tex]

[tex]m = 270.027\,kg[/tex]

La masa del objeto es 270.027 kilogramos.

Answer:

The greater the density of a medium, the slower the speed of sound. This observation is analogous to the fact that the frequency of a simple harmonic motion is inversely proportional to m, the mass of the oscillating object.

Air molecules have more energy at higher temperatures, which means they vibrate faster. This allows the sound waves to also travel faster because they are propelled by collisions between the molecules

Answer:

2500/240 will give the resistance to be 10.42

Answer and Explanation:

A. Exactly 25 J.

This is because the 25 J of energy that is holding down the book will always be the same, unless another force is being applied to hit to either make it heaver for a combined force of J energy, or something is lifting it, which will subtract the force of J of energy whilst moving.

#teamtrees #PAW (Plant And Water)

Answer:

Maximum pressure = 4450 N/m²

Explanation:

We'll begin by calculating the volume of the block. This can be obtained as follow:

Volume (V) = 5 cm × 3 cm × 2 cm

V = 30 cm³

Next, we shall determine the mass of the block. This can be obtained as follow:

Density = 8.9 g/cm³

Volume = 30 cm³

Mass =?

Density = mass /volume

8.9 = mass / 30

Cross multiply

Mass = 8.9 × 30

Mass = 267 g

Next, we shall covert 267 g to Kg.

1000 g = 1 Kg

Therefore,

267 g = 267 g × 1 Kg / 1000

267 g = 0.267 Kg

Thus, the mass of the block is 0.267 Kg

Next, we shall determine the force.

Force of gravity (g) = 10 N/Kg

Mass (m) = 0.267 Kg

Force (F) =?

F = mg

F = 0.267 × 20

F = 2.67 N

Next, we shall determine the minimum area since we are trying to obtain the maximum pressure. This can be obtained as follow:

Minimum area = 3 cm × 2 cm

Covert each measurement to metre (m) by dividing each measurement by 100

Minimum area = 0.03 m × 0.02 m

Minimum area = 0.0006 m²

Finally, we shall determine the maximum pressure. This can be obtained as follow:

Force (F) = 2.67 N

Minimum area = 0.0006 m²

Maximum pressure =?

Maximum pressure = Force /minimum area

Maximum pressure = 2.67 / 0.0006

Maximum pressure = 4450 N/m²

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Actually Welcome to the concept of Efficiency.

We know that, efficiency is given as,

E (eta) = Output work / Input Work

hence, here, E = 29% and Output work = 225

hence, 29% = 29/100 in real..

hence, the work done on piston is given as,

29/100 = 225/I

therefore, I = 225*100/29 ==> I = 22500/29 ==> I = 775.8 joules

hence, the work done on the pistons is 775 J

Answer:

4 weight loss

Explanation: