A Man Pulls a 100-N Crate Up a Frictionless 30

question 55

Multiple Choice

A man pulls a 100-N crate up a frictionless 30 ° slope 5 m high as shown. Assuming that the crate moves at constant speed, the work done by the man is:

• A) -500 J
• B) -250 J
• C) 0
• D) 250 J
• E) 500 J

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Definitions:

Placenta

An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing baby while removing waste products.

Pregnancy

The condition of having a developing embryo or fetus in the uterus, marked by various physical and hormonal changes.

Hormones

Chemical messengers produced by the endocrine glands that regulate bodily functions and processes.

Trophoblast

A layer of cells surrounding the blastocyst in early pregnancy, that provides nutrients to the embryo and develops into a large part of the placenta.