keananashville
14.04.2021 •
Physics
Question 1 of 32
If a crane worker lifts a crate with a mass of 250 kg from the ground to a
shipping container that is 20 meters off the ground, by how much has the
worker increased the gravitational potential energy of the crate? (Recall that g
= 9.8 m/s2)
A. 83,000 J
B. 61,000 J
C. 49,000 J
D. 75,000 J
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Ответ:
Wedge
Explanation:
A knife is used to cut things into pieces or even cut two items apart.
Now, it is classified as a Wedge because a Wedge is defined as a simple machine that is used in pushing two objects apart. Some examples include axes, knives & chisels.