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barxatty [35]
2 years ago
14

Calculate the efficiency of a light bulb that gives 40J of light from 200J of electrical energy’s

Physics
1 answer:
nekit [7.7K]2 years ago
7 0

Answer:

This formula is the most common one used. The efficiency is in a %

20%

Explanation:

Efficiency = energy out / energy in * 100 (for a %)

Efficiency = 40 / 200 * 100

Efficiency = 20%

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The Earth's axis of rotation is tilted. Because of this, the amount of sunlight an area on the planet receives each day varies
Sergio039 [100]

Answer: The Northern Hemisphere experiences the start of <u>summer</u>

Explanation:

Due to this tilt in Earth's axis of rotation, some regions receive different amounts of sunlight according to the seasons of the year. These variations are more evident near the poles and softer or imperceptible near the equator. This explains the fact that while in the northern hemisphere it is summer and there are high temperatures (because the Sunlight incides more perpendicularly in this area during this season), in the southern hemisphere it is winter and very low temperatures are recorded, and vice versa.  

In this sense, according to the image the Earth is at the point of its orbit in which, due to the inclination of its axis, the North Pole is closer to the Sun.  

In other words, the northern hemisphere is tilted toward the Sun, and this astronomical phenomenon brings the summer season for the Northern Hemisphere.

4 0
3 years ago
Read 2 more answers
A 9.0 V battery is connected across two resistors in series. If the resistors have resistances of and what is the voltage drop a
andreyandreev [35.5K]

Answer:

the answer to the question is known as D

4 0
3 years ago
Which vector should be negative?
pentagon [3]

Answer:

 The velocity of a falling object

Explanation:

  The positive X axis is towards right and positive Y axis is towards up, so North direction is positive

  A vector with less than 1 magnitude is not negative, because its magnitude may be in between 0 and 1 which is positive vector.

  Any vector whose magnitude is greater than 1 is never be a negative vector.

  The velocity of a falling object is towards bottom, that is towards negative Y axis. So that vector is negative.

7 0
3 years ago
Two carts have a compressed spring between them and are initially at rest. One of the carts has total mass, including its conten
ladessa [460]

Answer:

A) - 1.8 m/s

Explanation:

As we know that whole system is initially at rest and there is no external force on this system

So total momentum of the system must be conserved

so we will have

m_1v_1 + m_2v_2 = 0

now plug in all data into above equation

5(v) + 3(3)

5v = -9

v = -1.8 m/s

so correct answer is

A) - 1.8 m/s

3 0
3 years ago
Reading or writing on a phone is especially dangerous while driving because:
algol [13]

Answer:

Explanation:

When we are driving we need a lot of attention and concentration. Also one involved in driving should be consious and courteous

Thus, whenever a person is drives, and when he is disactracted by Mobile phones it will destroy his presence of mind.

It will good if use mobile after stopping the vehicle

Thanks

5 0
3 years ago
Read 2 more answers
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