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vodka [1.7K]
3 years ago
8

A construction worker puts 20 J of energy in to one strike of his hammer on the head of a nail. The energy transferred to drivin

g the nail into the wood is 8.0 J. What is the efficiency of the construction worker's hammering? (2 sig figs and answer in a percentage)
Physics
1 answer:
maks197457 [2]3 years ago
3 0

Answer:

The efficiency of the constuction is 9.0

Explanation:

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Materials in which electric charges move freely such as copper and aluminum are called
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Answer:

Conductors allow electric charges to move freely

8 0
4 years ago
the focal length of a simple magnifier is 8.50 cmcm . assume the magnifier to be a thin lens placed very close to the eye.
Igoryamba

When the object is at the focal point the angular magnification is 2.94.

Angular magnification:

The ratio of the angle subtended at the eye by the image formed by an optical instrument to that subtended at the eye by the object when not viewed through the instrument.

Here we have to find the angular magnification when the object is at the focal point.

Focal length = 6.00 cm

Formula to calculate angular magnification:

Angular magnification = 25/f

                                            = 25/ 8.5

                                             = 2.94

Therefore the angular magnification of this thin lens is 2.94

To know more about angular magnification refer:: brainly.com/question/28325488

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5 0
1 year ago
Why are unit of length mass and time independent with each other?​
mariarad [96]
Масса (килограмм), длина (метр) и время (секунда) - это 3 из 7 основных единиц в системе СИ.

Базовые единицы произвольно определены как то, что они есть, поэтому они не могут быть получены.

Все другие единицы в системе СИ являются производными от 7 основных единиц, таких как скорость (метр / секунда).

Остальные 4 - это температура (Кельвин), количество вещества (моль), электрический ток (ампер) и светимость (кандела).
4 0
3 years ago
Sara walks part way around a swimming pool. She walks 50 yards north, then
Mekhanik [1.2K]

Answer:

20 Yards

Explanation:

|---20----|

|            |

| 50       |50

|---D--->|

Start      End

Total displacement(D)  20 yards (East).

7 0
3 years ago
Which of these would most likely cause a sound wave?
Levart [38]
Among the choices the one that most likely cause a sound wave is C or the a spoon hitting the side of a bowl while mixing <span>because that's going to make a sound.

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
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6 0
3 years ago
Read 2 more answers
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