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2 years ago

A plant is sitting on a table.

2 answers:

7 0

Gravity would keep it down, static will make sure it doesn’t move, the pot gives it the support, the air resistance won’t bother it because of the heavy pot the plants in, applied force means just pushing it to the right

Explanation:

KIM [24]2 years ago

5 0

Yes gravity is acting downwards

No static friction as its at rest

Normal reaction is applied upwards

No air resistance

No Applied force

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A 30 kg dog runs at a speed of 15 m/s. What is the dog's kinetic energy (in jewels)? Round the answer to two significant digits.

mel-nik [20]

Answer:

It would be 12.34

Explanation:

6 0

3 years ago

Suppose the glass paperweight has index of refraction n=1.38. a) find the value of θ for which the reflection on the vertical su

zimovet [89]

Answer:

a)θ=71.89°

b)NO

Explanation:

Given that

For glass n= 1.38

We know that for air n'=1

The angle for total internal reflection θc given as

sin θc=n'/n

By putting the values

sin θc=n'/n

sin θc=1/1.38

θc=46.43°

n'sinθ = n sinθref

sinθref = cosθc

n'sinθ = n cosθc

1 x sinθ =1.38 x cos 46.43°

θ=71.89°

8 0

3 years ago

A starship blasts past the earth at 2.0*10^8 m/s .Just after passing the earth, the starship fires a laser beam out its back of

Vilka [71]

Answer:

at the speed of light ( $c=3.0\cdot 10^8 m/s$ )

Explanation:

The second postulate of the theory of the special relativity from Einstein states that:

"The speed of light in free space has the same value c in all inertial frames of reference, where $c=3.0\cdot 10^8 m/s$ "

This means that it doesn't matter if the observer is moving or not relative to the source of ligth: he will always observe light moving at the same speed, c.

In this problem, we have a starship emitting a laser beam (which is an electromagnetic wave, so it travels at the speed of light). The startship is moving relative to the Earth with a speed of 2.0*10^8 m/s: however, this is irrelevant for the exercise, because according to the postulate we mentioned above, an observer on Earth will observe the laser beam approaching Earth with a speed of $c=3.0\cdot 10^8 m/s$ .

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3 years ago

A paper airplane used to study wing designs is an example of a ?

kow [346]

Model I'm guessing. Coz that's using an object to explain

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3 years ago

Read 2 more answers

The current in resistor Y is..?

Aliun [14]

(A)

Explanation: