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VMariaS [17]
2 years ago
14

Joe runs 10 m north, 20 m south, 9m south, and then 15 m north. What is Joe's displacement?

Physics
1 answer:
tresset_1 [31]2 years ago
4 0

Answer:

Joes displacement is 54m

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A string under a tension of 50.4 N is used to whirl a rock in a horizontal circle of radius 2.51 m at a speed of 21.1 m/s. The s
Leokris [45]

Answer:

619.8 N

Explanation:

The tension in the string provides the centripetal force that keeps the rock in circular motion, so we can write:

T=m\frac{v^2}{r}

where

T is the tension

m is the mass of the rock

v is the speed

r is the radius of the circular path

At the beginning,

T = 50.4 N

v = 21.1 m/s

r = 2.51 m

So we can use the equation to find the mass of the rock:

m=\frac{Tr}{v^2}=\frac{(50.4)(2.51)}{21.1^2}=0.284 kg

Later, the radius of the string is decreased to

r' = 1.22 m

While the speed is increased to

v' = 51.6 m/s

Substituting these new data into the equation, we find the tension at which the string breaks:

T'=m\frac{v'^2}{r'}=(0.284)\frac{(51.6)^2}{1.22}=619.8 N

5 0
3 years ago
How fast would you have to jump off the ground in order to jump at least 10 meters in the air?
ivanzaharov [21]

Answer:

30.5

Explanation:

because you will basically have to be like flash

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3 years ago
A metal and a non-metal typically form covalent compounds.<br>True<br>False​
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Answer:

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Explanation:

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2 years ago
3. What are some questions that philosophers ask about knowledge?
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Hello there,

<span>What are some questions that philosophers ask about knowledge?

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~Jurgen</span>
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