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horrorfan [7]
3 years ago
11

PLEASE HELP THIS IS DUE TODAY!! (GIVING BRAINLIEST TO WHOEVERY ANSWERS QUICKLY AND CORRECTLY!) 15 POINTS!

Physics
1 answer:
Jlenok [28]3 years ago
5 0

As the core collapses, the outer layers of the star are expelled. A planetary nebula is formed by the outer layers. The core remains as a white dwarf and eventually cools to become a black dwarf. ... Like low-mass stars, high-mass stars are born in nebulae and evolve and live in the Main Sequence

hydrogen shell burning - outer layers swell. Red Giant Branch - helium ash core compresses - increased hydrogen shell burning. First Dredge Up - expanding atmosphere cools star - stirs carbon, nitrogen and oxygen upward - star heats up.

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Q1) An average force of 50.0 N is exerted on a 4.0-kg cart for 2.0 seconds.
lozanna [386]
<h3>a. The impulse</h3>

The impulse is 100.0 Ns

The impulse I = Ft where

  • F =average force = 50.0 N and
  • t = time = 2.0 s

Substituting these values into the equation, we have

I = Ft

I = 50.0 N × 2.0 s

I = 100.0 Ns

The impulse is 100.0 Ns

<h3>b. Change in momentum</h3>

The change in momentum is 100 kgm/s

Since change in momentum Δp = I where I = impulse.

Since I = 100.0 Ns,

Substituting this into the equation, we have

Δp = I

= 100.0 Ns

= 100 kgm/s

The change in momentum is 100 kgm/s

<h3>c. Mass's change in velocity</h3>

The change in velocity is 25.0 m/s

Since change in momentum Δp = mΔv where

  • m = mass = 4.0 kg and
  • Δv = change in velocity.

Making Δv subject of the formula, we have

Δv = Δp/m

Substituting the values of the variables into the equation, we have

Δv = Δp/m

Δv = 100.0 kgm/s/4.0 kg

Δv = 25.0 m/s

The change in velocity is 25.0 m/s

Learn more about impulse here:

brainly.com/question/25700778

3 0
3 years ago
A mass is undergoing simple harmonic motion. When its displacement is 0, it is at its equilibrium position. At that moment, its
Nostrana [21]

Answer:

Its speed is maximum and its acceleration is zero

Explanation:

- Concerning the speed:

In a simple harmonic motion, the speed can be determined through the law of conservation of energy. In fact, we have that the total mechanical energy of the system, which is sum of elastic potential energy U and kinetic energy K, is constant:

E=U+K=\frac{1}{2}kx^2+\frac{1}{2}mv^2

where k is the spring constant, x is the displacement, m is the mass and v is the speed.

We see that when the displacement is 0, x = 0: this means that the elastic potential energy U is also 0, therefore the kinetic energy K is maximum, and so the speed v is also maximum.

- Concerning the acceleration:

According to Newton's second law, the acceleration of the system is proportional to the net force:

a=\frac{F}{m}

the net force is just the restoring force of the spring, given by Hooke's law:

F=-kx

So, the acceleration is

a=-\frac{kx}{m}

and we see that when the displacement is zero, x = 0, and so the acceleration is also zero.

4 0
4 years ago
If a 50 kg person is running at a rate of 2 m/s, the person’s momentum is
bezimeni [28]
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6 0
3 years ago
Read 2 more answers
Write the equation of a wave traveling along the +x-axis with an amplitude of 0.02 m, a frequency of 440 Hz, and a speed of 330m
Airida [17]

The equation of the wave travelling along the +x-axis is y = 0.02 sin (880π/330 x – 880 πt)

<u>Explanation:</u>

Given data

Amplitude 0.02 m , Frequency= 440 Hz ,Speed = 330 m/s

The equation  format is written as,

y =   A   sin (       k        x  –   ω     t)

We need the value of  A, k, x -ω t

<u>1. Find the k value</u>

v     =  f ×λ

330 = 440×λ

   k = 2π×λ

k = 880 π /330  m-1

440 ×2π = w

<u>2. Find the ω  value</u>

f×2π =ω

ω = 880 π  s-1

<u>3. Find the A value</u>

we get A value from the given data

A = 0.02 m

By the formula,

y =   A   sin (       k        x  –   ω     t)

Substitute the values we get the equation,

y = 0.02 sin (880π/330 x – 880 πt)

The equation of the wave travelling along the +x-axis is y = 0.02 sin (880π/330 x – 880 πt)

8 0
3 years ago
Andy made a T-chart to compare the ovaries and testes. Look at the T-chart and select the answer that corrects Andy's mistake.
xxTIMURxx [149]

Answer:

D. Ovaries produce eggs, while testes produce sperm.

3 0
2 years ago
Read 2 more answers
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