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3 years ago

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18. In a solid conductor such as a metal, what is the cause of an electric current? A. A flow of positive and negative charges.

B. A flow of positive charges only. C. +A flow of negative charges only. D. A flow of protons. E. A flow of neutrons.

1 answer:

Serggg [28]3 years ago

5 0

The answer is A. <span> A flow of positive and negative charges. </span>

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Stars are classified mainly according to their distance from Earth.

Zielflug [23.3K]

The answer is b) false. Stars are mainly classified by their spectra (the elements they absorb) and their temperature.

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3 years ago

5. A belt runs on a wheel of 30.0-cm radius. During the time that the wheel coasts uniformly to rest from an initial speed of 2.

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Answer:

Angular acceleration = 0.95rad/s

Number or revolution is 13

Explanation:

See attached file

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3 years ago

5N of force is applied to move a large nail a distance of 10 cm from an electromagnet on a frictionless table. The nail is then

DedPeter [7]

Answer:

C) The rate of change from potential to kinetic energy is exponential.

Explanation:

As we know that total mechanical energy must be conserved here

As we know that there is no friction force on this system of electromagnet and nail

So here we can say that that

Magnetic potential energy of the nail + electromagnet system will convert into kinetic energy of the nail as it is released.

So we will have

Initial potential energy = work done to move it away by 10 cm

$U = 5(0.10)$

$U = 0.5 J$

now as the nail is released then this potential energy will start to convert into kinetic energy

So here correct answer must be

C) The rate of change from potential to kinetic energy is exponential.

7 0

3 years ago

A 25kg child sits on one end of a 2m see saw. How far from the pivot point should a rock of 50kg be placed on the other side of

ivann1987 [24]

Answer:

a rock of 50kg should be placed =drock=0.5m from the pivot point of see saw

Explanation:

τchild=τrock

Use the equation for torque in this equation.

(F)child(d)child)=(F)rock(d)rock)

The force of each object will be equal to the force of gravity.

(m)childg(d)child)=(m)rockg(d)rock)

Gravity can be canceled from each side of the equation. for simplicity.

(m)child(d)child)=(m)rock(d)rock)

Now we can use the mass of the rock and the mass of the child. The total length of the seesaw is two meters, and the child sits at one end. The child's distance from the center of the seesaw will be one meter.

(25kg)(1m)=(50kg)drock

Solve for the distance between the rock and the center of the seesaw.

drock=25kg⋅m50kg

drock=0.5m

6 0

3 years ago

This physics problem is kinda complicated to my small brains...

Veronika [31]

Answer:

$\huge\boxed{\sf P.E. = 14700\ Joules}$

Explanation:

This work done is in the form of Potential Energy so we'll use the formula of Potential Energy.

<u>Given Data:</u>

Mass = m = 250 kg

Acceleration due to gravity = g = 9.8 m/s²

Height = h = 6 m

<u>Required:</u>

Work Done in the form of Potential Energy = P.E. = ?

<u>Formula:</u>

P.E. = mgh

<u>Solution:</u>

P.E. = (250)(9.8)(6)

P.E. = 14700 Joules

$\rule[225]{225}{2}$

Hope this helped!

<h3>~AH1807</h3>

4 0

3 years ago