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VladimirAG [237]
4 years ago
8

Which is true regarding AC current? The electrons move back and forth. The +/- polarity is constant. It is common in portable de

vices. It can only produce low voltages.
Physics
2 answers:
Rus_ich [418]4 years ago
8 0
A. The electrons move back and forth.
Hope this helped. :L
andre [41]4 years ago
7 0

Answer: Option (a) is the correct answer.

Explanation:

AC current stands for alternating current. In an alternating current there is periodically reverse movement of current.

This means electrons move in one direction for a certain time and then they reverse their movement for the same time period and it continues in the back and forth position.

Thus, we can conclude that the statement electrons move back and forth is true regarding AC current.


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Clouds absorb outgoing radiation emitted by earth and reradiate a portion of it back to the surface during _____.
GarryVolchara [31]
I would say the correct answer is nighttime. The clouds in the atmosphere would absorb the radiation that is emitted by the Earth and at at night 30% of these would be radiated back to the Earth's surface. Hope this answers the question. <span />
4 0
3 years ago
Suppose that a particle's position is described by r(t)=(t+3)i+(t2+2)j. Give an equation (in the form of a formula involving x a
DiKsa [7]

Answer:

The velocity for the particle is (1i+2tj).

Explanation:

Given that,

The particle position is

r(t)=(t+3)i+(t^2+2)j...(I)

In form of x and y

x(t)=t+3....(II)

y(t)=t^2+2...(III)

From equation (II)

t=x-3

Put the value of t in equation (III)

y=(x-3)^2+2

y=x^2+9-6x+2

x^2-6x-y+11=0

We need to calculate the velocity

Velocity is the rate of change of the position of the particle

v(t)=\dfrac{dr}{dt}

\vec{v(t)}=1i+2t j

Hence, The velocity for the particle is (1i+2tj).

6 0
3 years ago
A 67kg stove is located on the 70th floor of a building (230m above ground). The stove has _______ energy. Calculate it.
sergey [27]

Answer:  

<em>Potential energy , </em>because it is defined as <em>the energy</em> held by object because of its position relative to other objects.. It is based on its distance from ground

Given data

    mass (m) = 67 kg ,

   height (h) = 230 m ,

      Potential energy (P.E.) = m. g. h

                                            = 67 × 9.81 × 230

                                            = 151172.1 J

                                  P.E.   = 151.18 KJ



6 0
4 years ago
Kai has a mass of 55kg. What would Kai weigh on Mars? (The gravitational field strength on Mars is 3.7N/kg.)
Paraphin [41]

The weight of any object is equal to the product of the mass of the object and the gravitational field strength of the environment.

Hence, weight = mass x gravitational field (mars)

weight = 55 x 3.7 = 203.5 N

Hope it helps. feel free to ask any doubts.

4 0
4 years ago
Will give brainlist.
Lera25 [3.4K]

Answer:

<u>Displacement (km)</u>

Explanation:

The y axis is the vertical axis pointing up and down. This is labeled as the the displacement (km) in the graph.

6 0
3 years ago
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