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2 years ago

How does moon appears to mov e across the night sky

Physics

1 answer:

trasher [3.6K]2 years ago

7 0

Answer:

The moon moves because the earth rotates around its axis of rotation. Although the moon moves too around its orbit, the speed is too small to notice. In other words, the moon's position changes insignificantly, however, the earth rotates fast enough to notice.

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You are looking down on a 20 kg beam resting on a horizontal, frictionless surface. The beam is 2 m long and can pivot about one

Korolek [52]

The angular speed of the rod after the impact is 1.49 rad/s

What is angular speed?

The rate of change of angular displacements is known as angular speed.

Angular speed is a scalar measure of the rotating object.

What is Angular momentum?

It is the property of a rotating body given by the product of the moment of inertia and the angular velocity of the rotating object.

Angular momentum is expressed as follows:

L=m*v*r

Here,

mass of beam, M =20 kg

mass of rock, m =0.1 kg

length of the beam, L =2 m

length where rock slides, l = (L / 2), l = 1 m

velocity of rock, v =400 m/s

As here the Torque on which the system is zero implies that the angular momentum is conserved.

Initial angular momentum for rock: I(ri) = m*v*r

Final angular momentum for rock: I(rf) = m*w*r^2

Final angular momentum for beam: I(bf) = 1/3 (M*L^2w)

Now, According to the conservation of momentum:

m*v*r = m*w*r^2 + 1/3 (ML^2w)

w = m*v*r / ( mr^2 + 1/3 ML^2 )

w = 0.1 *400*1 / ( (0.1 * 1) + 1/3 20* 2^2 )

w = 1.49 rad / s

The angular speed of the rod after the impact is 1.49 rad/s

Learn more about Angular speed here:

<u>brainly.com/question/14663644</u>

#SPJ4

6 0

2 years ago

Sum of the length of all three sides of the of a triangle is known as

Klio2033 [76]

Answer:

It's perimeter

Explanation:

That's what it said when I looked it up so hopefully that's correct.

3 0

3 years ago

An amount of energy is added to ice, raising its temperature from -10Â°C to -5Â°C. A larger amount of energy is added to the sam

lara [203]

Answer:

The correct option is;

B) The specific heat of ice is less than that of water.

Explanation:

Here we have

Let the amount of energy added to the ice at -10 C to raise the temperature to -5 C be X J

Let the amount of energy added to the water at 15 C to raise the temperature to 20 C be Y J

We know that the heat required, ΔQ to raise the temperature of a substance is given by

ΔQ = m·c·Δθ

Where:

m = Mass of the substance

c = Specific heat capacity

Δθ = Temperature change

Since the mass of the ice and the water are the same, so also is the change in temperature, (-5 - (-10) = 5 and 20 - 15 = 5) we have

for m₂·c₂·Δθ₂ > m₁·c₁·Δθ₁

Where:

m₁, c₁, Δθ₁, is for the ice and m₂, c₂, Δθ₂ is for the water and

m₁ = m₂

Δθ₁ = Δθ₂

Therefore,

c₂ > c₁ = c₁ < c₂

That is the specific heat capacity of the ice is lesser than the specific heat capacity of the water.

4 0

3 years ago

Read 2 more answers

Which answer is a scientifically accurate description of velocity?

Lyrx [107]

The boat traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes, giving the passengers several more hours to fish.

Explanation:

Velocity is the rate of change of displacement with time. It is a physical quantity that has both magnitude and direction.

When expressing velocity, we must consider the directional attribute as it distinguishes it from speed.

Statements:

The hiker began hiking the park's five-mile north hiking trail at 8:00 a.m. with plenty of daylight left to complete the hike before dark.

We are given the displacement of the hiker but the duration of traveling was not indicated. The starting time is known and there is nothing we can infer from it

The motorcyclist traveled along a highway at 55 mph and reached the campsite in less than the two-hour estimated time.

55mph is the speed of the motorcyclist and not velocity. There was no directional attribute.

Walking south along the two-mile canyon trail generally takes less time than traveling the same trail north because walking south is all downhill

This is not quantifiable.

The boat traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes, giving the passengers several more hours to fish.

The 200m marker north is the displacement and the time is 5minutes. This is the most scientifically accurate description of velocity.

Learn more:

Motion brainly.com/question/10883914

#learnwithBrainly

4 0

3 years ago

Which describes the molecular motion of a planet?

N76 [4]

<span>C.) The transfer of atoms from the top of the planet to the center of the planet in response to gravity

Hope this helps!</span>

6 0

3 years ago