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Alex787 [66]
3 years ago
14

On his fishing trip Justin takes the boat 25 km south. The fish aren’t biting so he goes 10 km west. He follows a school of fish

15 km north. What distance did he cover? What was his displacement?
Physics
1 answer:
vodomira [7]3 years ago
3 0

Distance is 50 km

Displacement is 10 km

<u>Explanation:</u>

Given:

Distance toward south, x = 25 km

Distance towards west, y = 10 km

Distance towards north, z = 15 km

(a) Total distance, D = ?

Total distance, D = x + y + z

                       D = 25 + 10 + 15

                       D = 50km

(b) Displacement, d = ?

Displacement = final position - initial position

                      = 10 - 0 km

                      = 10km

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Anestetic [448]

Answer:

21.75 m

Explanation:

t = Time taken for the car to slow down = 0.75 s

u = Initial velocity = 50 m/s

v = Final velocity = 8 m/s

s = Displacement

a = Acceleration

Equation of motion

v=u+at\\\Rightarrow a=\frac{v-u}{t}\\\Rightarrow a=\frac{8-50}{0.75}\\\Rightarrow a=-56\ m/s^2

Acceleration is -56 m/s²

v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{8^2-50^2}{2\times -56}\\\Rightarrow s=21.75\ m

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8 0
3 years ago
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solmaris [256]

Answer:

Atomic mass

Explanation:

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In order to calculate the atomic mass of an element using the weighted average masses, we use the expression below:

                    Atomic mass = ∑m_{i}α_{i}

Where m_{i} is the mass of isotope i

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The abundance or geonormal abundance is the proportion by which each of the isotope occurs in nature.

4 0
3 years ago
What is the efficiency of a tractor that has a work output of 300j and a work input of 400j
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<h3><u>Answer;</u></h3>

= 75 %

<h3><u>Explanation</u>;</h3>

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Efficiency = Work output/ work output × 100 %

                = 300/400 × 100

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Your answer is hot and dry weather
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so correct answer must be

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7 0
3 years ago
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