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Natali5045456 [20]

3 years ago

13

When the actual location of a rock on a riverbed is different from where an observer on dry land sees it, the principle of _____

____ is involved.
A) reflection
B) refraction
C) diffraction
D) total internal reflection

1 answer:

Anettt [7]3 years ago

5 0

Answer:

B) refraction

Explanation:

the water refracts then the rock different place

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A ball is thrown horizontally from the top of a 41 m vertical cliff and lands 112 m from the base of the cliff. How fast is the

yanalaym [24]

Answer:

4.78 second

Explanation:

given data

vertical cliff = 41 m

height = 112 m

solution

we know here time taken to fall vertically from the cliff = time taken to move horizontally ..........................1

so we use here vertical component of ball

and that is accelerated motion with initial velocity = 0

so we can solve for it as

height = 0.5 × g × t² ........................2

put here value

112 = 0.5 × 9.8 × t²

solve it we get

t² = 22.857

t = 4.78 second

ball thrown horizontally from the top of the cliff in 4.78 second

4 0

4 years ago

A 6157 N piano is to be pushed up a(n) 2.41 m frictionless plank that makes an angle of 21.9 ◦ with the horizontal. Calculate th

xz_007 [3.2K]

Answer:

Work done, W = 5534.53 J

Explanation:

It is given that,

Force acting on the piano, F = 6157 N

It is pushed up a distance of 2.41 m friction less plank.

Let W is the work done in sliding the piano up the plank at a slow constant rate. It is given by :

$W=Fd\ sin\theta$

Since, $F=F\ sin\theta$ (in vertical direction)

$W=6157\times 2.41\ sin(21.9)$

W = 5534.53 J

So, the work done in sliding the piano up the plank is 5534.53 J. Hence, this is the required solution.

3 0

4 years ago

How many suns do you think are in our galaxy? Explain your answer PLS HELP ASP BEST GETS BRAINLIEST

dexar [7]

Answer: There is only one Sun in the galaxy … that is the thing that rises in the morning and sets at night. However, there is a use of “sun” to signify any old star … nobody knows exactly there might be trillions out there

Explanation:

3 0

3 years ago

You are discussing a material that has a strong resistance to the flow of electrons. This is a description of a(n)

cupoosta [38]

C. Insulator

It COULD be semi-insulator but i'm sure its C

5 0

3 years ago

Read 2 more answers

A 38.5kg man is in an elevator accelerating downward. A normal force of 343n pushes up on him. what is his acceleration?

alexira [117]

Answer:

<h3>The answer is 8.91 m/s²</h3>

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

$a = \frac{f}{m} \\$

f is the force

m is the mass

From the question we have

$a = \frac{343}{38.5} = \frac{98}{11} \\ = 8.909090...$

We have the final answer as

<h3>8.91 m/s²</h3>

Hope this helps you

4 0

3 years ago