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Mamont248 [21]
3 years ago
7

If an object with charge -3 nC moves from a location that has a potential of -20 V to a location with a potential of -10 V, what

has happened to the potential energy of the system?
Physics
1 answer:
enot [183]3 years ago
8 0

The potential energy decreases.

<u />

<u>Explanation:</u>

Given-

Charge of the object, q = -3nC

Initial potential, Vi = -20V

Final potential, Vf = -10V

Potential energy, U = ?

We know,

Potential, V = U/q

initial potential energy = Viq

                                                        = -20V X -3nC

                                                        = 60 nJ

Final potential energy = Vfq

                                     = -10V X -3nC

                                     = 30nJ

We can see that the potential energy decreases as the object moves from initial to final position which means that the work is done against the electric field.

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Sound waves that enter the ear canal are directed to the ____, causing it to vibrate.
andre [41]

According to the research, the correct option the eardrum. Sound waves that enter the ear canal are directed to the <u>eardrum</u>, causing it to vibrate.

<h3>What is the eardrum?</h3>

It is the membrane found in the middle ear of vertebrate animals, separating this sector from the external auditory canal.

When sound waves enter through the external auditory canal, the eardrum vibrates, transmitting its movement to the middle ear through a series of bones and in this way, the pressure change is transformed into a mechanical movement.

Therefore, we can conclude that according to the research, the correct option is the eardrum. Sound waves that enter the ear canal are directed to the <u>eardrum</u>, causing it to vibrate.

Learn more about the eardrum here: brainly.com/question/12770491

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4 0
2 years ago
Urgent!!!
Luba_88 [7]

<u>T</u><u>he area w</u><u>h</u><u>ich touches the sand floor of 4 feet of the bull is less than the man.</u>

because the area of surface of contact is more in bull than in man. More is the area of contact, leads is the force or pressure affected.

5 0
3 years ago
An office worker has his lunch on the 53rd floor of an office building. In which case is the gravitational potential energy of t
Ann [662]

Options

a. The worker carried the lunch up to the 53rd floor in the elevator.

b. The worker got a ride in a helicopter to the top of the 68-floor building and then carried the lunch down in the elevator to the 53rd floor?

c. The Worker carried it up the stairs to the 53rd floor.

d. Gravitational potential energy does not depend on the path taken.

Answer:

The gravitational Energy would remain the same in all cases.

Explanation:

Gravitational Energy is a conservative energy and its potential energy comes from gravitational actions.

An instance is when someone lifts a weight from the floor to a certain height and then dropped the weight back to the floor; the work done by the field will not be altered at all; it'll be the same throughout.

If otherwise, it'll be against thermodynamics 2nd law of physics because the object would have remaining energy after returning to the starting point,

For this reason, the gravitational potential energy only depends from the height, and is independent from the path taken to reach there.

4 0
3 years ago
Salt water has greater density than fresh water. A boat floats in both fresh water and in salt 12) water. Where is the buoyant f
Vedmedyk [2.9K]

Answer:

in salt water

Explanation:

The buoyant force acting on a body depends on the volume of body immersed, density of liquid in which the body is immersed and acceleration due to gravity.

Buoyant force = Volume immersed x density of liquid x g

As the density of salt water is more than the fresh water so the buoyant force acting on the boat in salt water is more than the fresh water.

7 0
3 years ago
A model car moves round a circular path of radius 0.3m at 2 revolutions per secs what is its angular speed, the period of the ca
valkas [14]

Answer:

a) T = 0.5 s

b) v = 1.2π m/s ≈ 3.77 m/s

Explanation:

It makes two revolutions in one second so makes one revolution in ½ second

circumference of the circle is

C = 2πr = 0.6π m

which it traverses in one time period

0.6π m / 0.5 s = 1.2π m/s

4 0
3 years ago
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