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Ludmilka [50]
3 years ago
5

A 20 kg box has been lifted 0.7m. How much work has been done?

Biology
1 answer:
Serga [27]3 years ago
4 0
The work done is 137 joules.

Lifting opposes the acceleration of gravity, which is 9.8 m/sec/sec.

20 x 0.7 x 9.8 = 137 J (kg-m2/sec2)

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joja [24]

Answer:

Option B

Explanation:

Question -

You just came back from class in which the topic was egocentrism in the preoperational stage. You have a 4-year-old and thought that you would see if what you learned was accurate. You are sitting directly across from her and ask her to look at the front and back cover of her favorite book. After she did this you asked her to describe "the part of the book I am looking at." What does she tell you?

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Solution

As per Piaget's theory of cognitive development, when a child is at the preoperational stage he/she is able to think only at symbolic level and cannot use his/her cognitive thinking.  

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EastWind [94]

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