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just olya [345]
3 years ago
7

A person leaves a house and walks three blocks north, then walks three blocks west. In what direction is the displacement of the

person, relative to the starting point? A North B Northwest C South D Southwest
Physics
1 answer:
Sergeeva-Olga [200]3 years ago
4 0
B Northwest hope this helps


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Two trains travel at right angles to each other after leaving the same train station at the same time. Two hours later they are
Vikentia [17]

Answer:

Speed of faster train equals 29 mph

Explanation:

Let the speed of slower train be 'x' miles per hour and the speed of faster train be 'y' miles per hour.

Distance that slower train covers in 2 hours=2\times x miles

Distance that faster train covers in 2 hours=2\times y miles

Since they move at right angles the distance between them can be found by Pythagoras formula as

d^{2}=(2x)^{2}+(2y)^{2}\\\\d^{2}=4(x^{2}+y^{2})\\(70.46)^{2}=4(x^{2}+y^{2})\\\\\therefore (x^{2}+y^{2})=\frac{(70.46)^{2}}{4}\\\\(x^{2}+y^{2})=\frac{4964.6}{4}\\\\(x^{2}+y^{2})=1241.15

It is given that y=x+9

Using this in the above equation we get

(x^{2}+y^{2})=1241.15\\\\x^{2}+(x+8)^{2}=1241.15\\2x^{2}+16x+64=1241.15\\2x^{2}+16x-1177.15=0

This is a quadratic equation in 'x'

Comparing with standard quadratic equation ax^{2}+bx+c we get value of x as

(x^{2}+y^{2})=1241.15\\\\x^{2}+(x+8)^{2}=1241.15\\2x^{2}+16x+64=1241.15\\2x^{2}+16x-1177.15=0\\\\x=\frac{-16\pm \sqrt{(16)^{2}-4\times 2\times -1177.15}}{2\times 2}\\\\x=\frac{-16\pm 98.35}{4}\\\\x=20.58mph(\because speed\neq

Thus speed of faster train = 28.58 mph

Speed of faster train = 19 mph

3 0
3 years ago
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What is the final velocity of a block that falls off of the top of a tower that is 45 meters
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Answer:

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Explanation:

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Explain why it is dangerous to touch the live wire when a switch in the<br> mains circuit is open.
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Answer: all the energy is rushed in the wires due to the swich turning on when touching it may start a fire or electricute

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The reason a filter system is used in this experiment is to separate and collect in the reaction.
Mila [183]

Explanation:

Filtration is used to separate mixtures containing materials of relative size differences.

They are typically used to separate solid-liquid mixtures.

  • The filter system must have been used in the experiment to separate filtrates and collect them in the reaction.
  • The liquid passes through the filter and leaves behind the solute or suspension in the filter.
  • The fluid that passes through the filter is the filtrate.
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learn more:

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Use the following information to answer the next question.
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Answer:

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