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ella [17]
3 years ago
10

Electric power companies measure energy consumption in kilowatt-hours, denoted kWh. One kilowatt-hour is the amount of energy tr

ansferred by 1 kW of power in a period of 1 hour. A power company billing statement reports auser's total energy usage to be 1500 kWh. Find the amount of energy in joules used during the billing period.
Physics
1 answer:
Natali [406]3 years ago
7 0

The amount of energy used in the billing period is 5,400,000,000 joules.

One kWH is the amount of energy transferred in one hour, there 1 kWh is equal to

1 kWh=1*1000*(J/s)*3600 s

=3600000 J

Thus the amount of energy in joules consumed by the user for the billing period is =1500*3600000=5,400,000,000 J.

The amount of energy used in the billing period is 5,400,000,000 joules.

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A wheel rotating with a constant angular acceleration turns through 19 revolutions during a 3 s time interval. Its angular veloc
Elanso [62]

Answer:

- 14.5 rad/s^2

Explanation:

n = 19

θ = 2 x 3.14 x 19 = 119.32 rad

t = 3 s, ω = 18 rad /s , ω0 = ?,

Let α be the angular acceleration.

Use First equation of motion for rotational motion

ω = ω0 + α t

18 = ω0 + α x 3

ω0 = 18 - 3α .....(1)

Use second equation of motion for rotational motion

θ = ω0 t + 1/2 x α x t^2

Put the value of ω0 = 18 - 3α from equation (1)

119.32 = (18 - 3α) x 3 + 1/2 x α x 9

119.32 - 54 = - 4.5 α

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6 0
4 years ago
An interstellar spacecraft, far from the influence of any stars or planets, is moving at high speed under the influence of fusio
Lorico [155]

An interstellar spacecraft, far from the influence of any stars or planets, is moving at high speed under the influence of fusion rockets when the engines malfunction and stop. The spacecraft will keep moving forever at the same speed.

  • What is Interstellar spacecraft:

Interstellar travel refers to the idea of interstellar probes or crewed spacecraft moving between stars or planetary systems in a galaxy.

here, An interstellar spacecraft, far from the influence of any stars or planets, is moving at high speed.

According to Newton’s first law:

  • Newton’s first law states that, without any external force, if a body is at rest, it will remain at rest and if the body is moving with constant velocity, it will continue to do so.

Since here there is no external force present,

Therefore the spacecraft will keep moving forever at the same speed.

Thus,

from the above observation we conclude that,

option (D) is correct

Learn more about Interstellar spacecraft here:

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3 0
2 years ago
When a virtual image is created in a plane mirrora. the image is upright.b. the image is located behind the mirror.c. reflected
zubka84 [21]
<h2>Answer: all of the above</h2>

A plane mirror is a highly polished flat surface with a very high capacity to reflect incident light.

According to the figure attached:

1. The incident rays coming from the real object reach the mirror and  

2.are reflected following the law of Reflection.  

3.The prolongation of those reflected rays converge at a point that <u>does not coincide</u> with the actual position of the object. At that point the virtual image of the object is formed.  

4.Then, the reflected divergent rays are captured by our eye converging on the retina.

Now, the image is said to be <u>virtual</u> because it is a copy of the object that looks as if the object is behind the mirror and not in front of it or on the surface, but it is not really there. However, it can be seen when we focus it with our eyes.

In addition, the image formed is:

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the same size as the object.

upright, because it retains the same orientation as the object.

All these characteristics coincide with the first three options proposed in the question, so the correct option is d.

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4 years ago
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