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3 years ago

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Physics

1 answer:

olya-2409 [2.1K]3 years ago

6 0

Weight = (mass) x (acceleration of gravity)

Acceleration of gravity = 9.81 m/s² on Earth, 1.62 m/s² on the Moon.

The feather's weight is . . .

On Earth: (0.0001 kg) x (9.81 m/s²) = 0.000981 Newton

On the Moon: (0.0001 kg) x (1.62 m/s²) = 0.000162 N

The presence or absence of atmosphere makes no difference. In fact, the numbers would be the same if the feather were sealed in a jar, or spinning wildly in a tornado, or hanging by a thread, or floating in a bowl of water or chicken soup. Weight is just the force of gravity between the feather and the Earth. It's not affected by what's around the feather, or what's happening to it.

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An important news announcement is transmitted by radio waves to people who are 82 km away, sitting next to their radios, and by

Viktor [21]

Answer:

13.5 ms

Explanation:

The sound wave travels with uniform motion in both cases, so the time taken to cover a distance d is given by:

$t=\frac{d}{v}$

where

d is the distance to cover

v = 340 m/s is the speed of sound in air

So for the people across the newsroom,

d = 4.7 m

So the time taken is

$t=\frac{4.7}{340}=0.0138 s = 13.8 ms$

The radio waves instead travels with uniform motion at the speed of light:

$c=3.0\cdot 10^8 m/s$

So the time taken for them is

$t=\frac{d}{c}$

where

d = 82 km = 82,000 m

is the distance of the people who are 82 km away. Substituting,

$t=\frac{82,000}{3.0\cdot 10^8}=0.27\cdot 10^{-3} s = 0.27 ms$

Therefore, the difference in time is

$\Delta t = 13.8 ms - 0.27 ms = 13.5 ms$

4 0

3 years ago

Why is photoelectric effect important?

vampirchik [111]

Study of the photoelectric effect led to important steps in understanding the quantum nature of light and electrons and influenced the formation of the concept of wave-particle duality. The photoelectric effect is also widely used to investigate electron energy levels in matter.

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3 years ago

A certain planet has an escape speed V. If another planet has the same mass and twice the size of the first planet, its escape s

jasenka [17]

Pretty sure 2V?

(Brainliest/thanks?)

3 0

3 years ago

1. Show how the alternative definition of power, found in your book, can be derived by substituting the definitions of work and

disa [49]

1) Star from the definition of power:

P = work/ time = W / Δt

We know that work is given by force times displacement:
W = F · Δd
Substituting in our formula:
P = F · Δd / Δt

But we know by definition that Δd / Δt = velocity, therefore we can write:
P = F · v
which is the alternative formula saying that Power is equal to Force times Velocity

2) No, it is not a violation of the Law of conservation of energy because as the spring slows down, the kinetic energy is transformed into potential energy and their sum stays constant.

6 0

4 years ago

A motorcyclist accelerates from rest to 10 mi/hr. what is the change in velocity

gulaghasi [49]

The change in velocity is 10 mi/h (4.47 m/s)

Explanation:

The change in velocity of the motorcyclist is given by

$\Delta v = v-u$

where

v is the final velocity

u is the initial velocity

In this problem, we have

u = 0 (the motorbike starts from rest)

v = 10 mi/h

Therefore, the change in velocity is

$\Delta v = 10 -0 = 10 mi/h$

And keeping in mind that

1 mile = 1609 m

1 h = 3600 s

We can convert it into m/s:

$\Delta v = 10 \frac{mi}{h} \cdot \frac{1609 m/mi}{3600 s/h}=4.47 m/s$

Learn more about velocity:

brainly.com/question/5248528

#LearnwithBrainly

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3 years ago