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3 years ago

6

While loading, a truck moves 10 meters west from point A to point B in 5 seconds. Then it moves to point A in 5 seconds. What ar

e the average speed and average velocity of the truck?

1 answer:

sasho [114]3 years ago

7 0

V = d/t = 10m / 5 s = 2m/s

point a to point b = 2m/s
point b to point a = 2m/s

avg speed = (2m/s+2m/s)/2 = 2m/s
avg velocity= (2m/s+2m/s)/2 = 2m/s

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A helicopter is ascending vertically. a passenger accidentally drops her wallet out the sides of the helicopter when it is 160 m

Advocard [28]

Answer:

(E)56.0 m/s

Explanation:

Height =h=-160 m

Because the wallet moving in downward direction

Time=t=7 s

Final speed of wallet=v=0

We have to find the speed of helicopter ascending at the moment when the passenger let go of the wallet.

$v^2-u^2=2gh$

Where $g=9.8 m/s^2$

Substitute the values

$0-u^2=2(-160)\times 9.8$

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$u=\sqrt{3136}=56m/s$

Option (E) is true

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4 years ago

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IgorLugansk [536]

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Explanation:

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3 years ago

An object is dropped from rest from the top of a 400 m cliff on Earth. If air resistance is negligible, what is the distance the

IrinaVladis [17]

Answer:

176.58 m

Explanation:

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u = Initial velocity = 0

v = Final velocity

s = Displacement

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Equation of motion

$s=ut+\dfrac{1}{2}at^2\\\Rightarrow s=0\times t+\dfrac{1}{2}\times 9.81\times 6^2\\\Rightarrow s=176.58\ m$

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4 years ago

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beks73 [17]

Answer:

T=575.16K

Explanation:

To solve the problem we proceed to use the 1 law of diffusion of flow,

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D is the diffusion coefficient, where,

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clearing T,

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Replacing our values

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4 years ago

Which data set has the smallest standard deviation?

777dan777 [17]

The answer would be B.
<span>
Standard deviation basically measures how spread out the values are. Without solving, you can easily tell which one among your choices have a smaller deviation. The closer the values are to each other the smaller the standard deviation. The values of choice B are the closest together, so you can assume that they have the smallest standard deviation. </span>

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4 years ago

Read 2 more answers