Social Studies, 15.10.2019 00:00 jerseygirl6167

Mr. letourneau is flying his broom stick parallel to the ground. he undergoes two consecutive displacements. the first is 100 km 10 degrees west of north, and the second is 120 km 50 degrees east of north. what is the magnitude of the broom stick's displacement?

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Answer from: aisatubrodie4626

190.78 km

Explanation:

Given

First Displacement is $100 km ^{\circ}$ west of north

Position Vector (r_1) of displacement is given by

$\vec{r_1}=100cos10\hat{j}-100sin10\hat{i}$

$\vec{r_1}=98.48\hat{j}-17.36\hat{i}$

Considering East as X axis and North Y axis

second displacement is 120 km $50^{\circ}$ east of north

Now position Vector of second Position w.r.t to first

$\vec{r_{21}}=120cos50\hat{j}+120sin50\hat{i}$

$\vec{r_{21}}=77.13\hat{j}+91.92\hat{i}$

$\vec{r_2}=\vec{r_1}+\vec{r_{21}}$

$\vec{r_2}=98.48\hat{j}-17.36\hat{i}+77.13\hat{j}+91.92\hat{i}$

$\vec{r_2}=74.56\hat{i}+175.61\hat{j}$

magnitude of displacement

|r_2| =190.78 km

Answer from: Quest

as university of miami psychologists debra lieberman and adam smith pointed out in a recent article in the journal current directions in psychological science, humans have social and psychological mechanisms to deter incest. with very few exceptions, marriages between brothers and sisters and between parents and their children are verboten in every human culture. the primary psychological anti-incest mechanism is the yuck response. even the idea of sex with their mom or dad, bro or sis is upsetting to most people. the psychologist jonathan haidt has found that nearly everyone is repelled by the prospect of brother-sister sex, even in hypothetical situations in which there is no chance of pregnancy).

the biological cost of incest

this raises an interesting question: just what’s so bad about incest? sure, having sex with your dad or your sister seems gross — but why? some anthropologists have argued that incest taboos are learned social conventions. this explanation, however, doesn’t make sense to me as it does not explain the widespread existence of anti-incest mechanisms in creatures ranging from cockroaches to chimpanzees. second, the incest taboo is about as close to a universal law as human moral rules get.

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Answer from: Quest

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Mr. letourneau is flying his broom stick parallel to the ground. he undergoes two consecutive displa...

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