2 years ago

Why is it necessary to be able to replicate the results of a scientific experiment

1 answer:

5 0

To ensure the results are not a mistake and to add credibility and validity to the results. A good theory can always be tested.

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A projectile is fired at an angle of 53° to the horizontal with a speed of 80. meters per second. What is the vertical component

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Answer:64 m/s

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2 years ago

A rock is at the top of a 20 meter tall hill. The rock has a mass of 10kg. How much potential energy does it have?

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3 years ago

A research vessel is mapping the bottom of the ocean using sonar. It emits a short sound pulse called "ping" downward. The frequ

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Answer:

The ocean is 6485.6m deep when measured from the vessel

Explanation:

v=1474m/s

t=8.88s

let d represent distance from the vessel to the ocean bottom.

an echo travels a distance equivalent to 2d, that is to and fro after it reflects from the obstacle.

$velocity=\frac{distance}{time}\\ v=\frac{2d}{t} \\vt=2d\\d=\frac{vt}{2}$

$d=\frac{1474*8.8}{2}$

d= 6485.6m

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2 years ago

Imagine that a hypothetical life form is discovered on our moon and transported to Earth. On a hot day, this life form begins to

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Answer:

The heat of vaporization 580 cal/g times 602g = cal in human and do the same for life form.

Explanation:

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3 years ago

To practice Problem-Solving Strategy 7.2 Problems Using Mechanical Energy II. The Great Sandini is a 60.0-kg circus performer wh

sp2606 [1]

Answer:

$v = 15.45 m/s$

Explanation:

As per mechanical energy conservation we can say that here since friction is present in the barrel so we will have

Work done by friction force = Loss in mechanical energy

so we will have

$W_f = (U_i + K_i) - (U_f + K_f)$

here we know that

$W_f = F_f . d$

$W_f = 40 \times 4$

$W_f = 160 J$

Initial compression in the spring is given as

$F = kx$

$4400 = 1100 x$

$x = 4 m$

now from above equation

$W_f = (\frac{1}{2}kx^2 + 0) - (mgh + \frac{1}{2}mv^2)$

$160 = (\frac{1}{2}1100(4^2) + 0) - (60 \times 9.8\times 2.50 + \frac{1}{2}(60)v^2)$

$160 = 8800 - 1470 - 30 v^2$

$v = 15.45 m/s$

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2 years ago