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Describe the life cycle of a star before it collapses into a black hole.


Describe the life cycle of a star before it becomes a black dwarf.



What is the likely outcome of our sun? *
The sun will supernova and become a black hole.
The sun will swell, encompassing the inner planets and collapses into a dwarf star.
The sun will become a pulsar.

How Do You Know?

P.S. the how do you know is only for the last question

Answer:

B or C

Explanation:

Answer:

The hammer and the wall exert forces on each other that are equal in magnitude but in opposite directions.

Answer:

The hammer and the wall exert forces on each other that are equal in magnitude but in opposite directions.

Explanation:

This is due to Newton's 3rd law, which states that "for every action (force) in nature there is an equal and opposite reaction". This means that as the hammer exerts a force on the wall, the wall must exert a force back on the hammer of equal magnitude but in the opposite direction.

Let the circumference of the circle be 10L.

A moves at 10L/2 = 5L per hour

B moves at 10L/5 = 2L per hour

Therefore it takes 10L/(5L+2L) = 10/7 hours

The earthquake would occur 13 minutes before 10:05 a.m. which will be at 9.52 am.

The p-waves travel with a constant velocity of 7 km/s

The time can be calculated by using the formula

t = d / v

where

T1 =  10:05 a.m

d is the distance they take to travel from the epicenter

v is the speed of the p-waves

On average, the speed of p-waves is

v = 7 km/s

d = 5600 km (given)

Substituting the values in the formula;

t = d / v

t = 5600 ÷ 7

t = 800 seconds

Converting into minutes,

t = 800 ÷ 60

t = 13.3

≈ 13 mins

T1 -  13 mins = T2

10:05 - 13 mins = 9.52 am

It means the earthquake occurred prior 13 minutes, that is at 9.52 am.

Therefore, the earthquake occurred at 9.52 am.

Learn more about earthquakes from the given link.

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What happened to the plane's kinetic energy is that "On the return flight, the plane has less kinetic energy".

option C is the correct answer.

The kinetic energy of an object is the mechanical energy of the object due to its motion.

Mathematically, the formula for kinetic energy is given as;

K.E = ¹/₂mv²

where;

From the equation above, the kinetic energy of an object increases with increase in the mass and velocity of the object.

For a airplane carrying 320 passengers initially  and on return carries 164 passengers flying at the same speed of 490 miles per hour. The initial kinetic energy of the plane will be greater than the final kinetic energy because of the decrease in mass in the return trip.

Thus, the final kinetic energy of plane will reduce due to decrease in the number of passengers.

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Answer:

(Question) A city gets its electricity from a dam, where water is stored in a reservoir. How does the water provide the city with its power?

(Answer) Potential energy in the water becomes kinetic energy as it moves through turbines, which turn kinetic energy into mechanical energy that spins a generator, which changes mechanical energy into electricity.

(Question) An acorn rolls off a roof and falls to the ground. Which statement best describes the change in energy?

(Answer) The acorn’s potential energy decreases as its kinetic energy increases.

(Question) An airplane carries 320 passengers from Phoenix to Los Angeles flying at an average speed of 490 miles per hour. On the return flight, the plane carries 164 passengers and travels at the same average speed. What happens to the plane’s kinetic energy?

(Answer) On the return flight, the plane has less kinetic energy.

(Question) A racehorse is running at 42 miles per hour, equivalent to 18.8 meters per second. The horse and its jockey have a combined mass of 512 kilograms. How much kinetic energy do they have?

(Answer) 90,480.6 J

(Question) Which object has kinetic energy?

(Answer) balloon rising in the sky

(Question) Mr. Starr pushed a cart full of groceries to his car. After emptying the cart, he pushed it back to the store. He pushed the cart at a speed of 2 meters per second each way. Which is the best prediction?

(Answer) When it was empty, the cart had less kinetic energy.

(Question) A student fires a toy rocket into the sky. When does the rocket have the most potential energy?

(Answer) when the rocket reaches its highest point

(Question) What is the best description of one billiard ball hitting a second billiard ball?

(Answer) Most of the kinetic energy in the first ball is transferred to the second ball.

(Question) A roller-coaster car is at the top of a hill. The car and its passengers have a combined mass of 1,088 kilograms. If the hill is 62 meters tall, how much potential energy does the car have?

(Answer) 661,068.8 J

(Question) A roller-coaster is at the top of a 62-meter hill. The car and its passengers have a total mass of 1,088 kilograms. By the time the car reaches the bottom of the hill, its speed is 74 miles per hour (33 meters per second). How much kinetic energy does the car have at the bottom of the hill?

(Answer) 592,416 J

(Question) A diagram is drawn showing a swing set with a swing pulled backward prior to release. The diagram shows how the swing will move forward and then backward after it is initially released. At which point in the diagram is all of the energy gravitational potential energy?

(Answer) when the swing is pulled back prior to release

(Question) essay

(Answer) good luck

(Question) essay

(Answer) good luck

Explanation:

I just finished the assignment.

The electron number cannot be used instead because electrons can be removed from or added to an atom (option C)

The element of an atom is determined by its proton count, while the electron count can exhibit variability. Take, for instance, a sodium atom, which encompasses 11 protons and 11 electrons. However, it has the capacity to relinquish one electron, transforming into a sodium ion housing only 10 electrons.

This occurs due to the relatively loose binding of electrons to the nucleus, enabling their removal through the influence of an electric field or alternative mechanisms.

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Answer:

9.05m/s

Explanation:

given data

m1= 2700kg

v1=3.7m/s

m2=0.18kg

v2=9.05m/s

v3=?

We know that the velocity of the rhino will remains unchanged after impact as the mass of the rubber ball is negligible

m1v1+m2v2=m1v1+m2v3

2700*3.7+0.18*9.05=2700*3.7+0.18*v3

9990+1.629=9990+0.18v3

9991.629-9990=0.18v3

1.629=0.18v3

v3=1.629/0.18

v3=9.05m/s

Answer:

Explanation:

A mass moving in a circular motion. Tangential speed will be constant, and centripetal acceleration will be of constant magnitude at 90° to the direction of instantaneous velocity.

Answer:

18 newtons

Explanation:

Divide weight by speed

Answer:

Range is 62.5 metres

Explanation:

Time of flight

\(t = \frac{2u \sin( \theta) }{g} \)

for range, acceleration is zero

from second newton's equation:

\(S = ut + \frac{1}{2} {at}^{2} \)

but a = 0:

let range be x:

\(x = ut \\ x = \frac{2 {u}^{2} \sin( \theta) }{g} \\ \\ x = \frac{ \{2 \times 25 {}^{2} \sin(30 \degree) \}}{10} \\ \\ x = 62.5 \: metres\)

[ taken g to be 10 m/s² ]

Answer:

238,900 mi

Explanation:

Have a nice day! :)

Answer:

2.6x10^{10}

Explanation:

please do follow me

Answer:

a protective and waxy or hard layer covering the epidermis of a plant, invertebrate, or shell.

Answer:

The cuticles for animals are a thin layer of clear dead skin around the nail bed on fingers and toes. As the nail grows, it naturally pushes and damages the underside of the skin around the base of the nails, called the eponychium. The space between the eponychium and the bottom of the nail is where the cuticle is located.  

The cuticle definition related to plants is a protective and waxy or hard layer covering the epidermis. The plant cuticle is an extracellular hydrophobic layer that covers the aerial epidermis.

Explanation:

Answer:The electric current

Explanation:

Before calculating one should convert all the physical quantities to their respective SI unit.

The SI unit of mass is kg. The SI unit of length is m. kg/m³ is an SI-derived unit. But cm meter is neither a SI unit nor an SI-derived unit.

Therefore 'cm' is the unit that needs to be converted before being used for the calculation.

Answer:

Explanation:

mass of probe m = 474 Kg

initial speed u = 275 m /s

force acting on it F = 5.6 x 10⁻² N

displacement s = 2.42 x 10⁹ m

A )

initial kinetic energy = 1/2 m u²  , m is mass of probe.

= .5 x 474 x 275²

= 17923125 J  

B )

work done by engine

= force x displacement

= 5.6 x 10⁻² x 2.42 x 10⁹

= 13.55 x 10⁷ J  

C ) Final kinetic energy

= Initial K E + work done by force on it

= 17923125 +13.55 x 10⁷

= 1.79 x 10⁷ + 13.55 x 10⁷

= 15.34 x 10⁷ J

D ) If v be its velocity

1/2 m v² = 15.34 x 10⁷

1/2 x 474 x v² =  15.34 x 10⁷

v² = 64.72 x 10⁴

v = 8.04 x 10² m /s

= 804 m /s

Answer:

The formula is a = F m so in this case a = 5 10 = 0.5 m s 2

Explanation:

Answer:

The pole stores elastic potential energy when the pole is bent because its shape is change from its natural shape and it will want to go back to its original form, just like a spring or stretched elastic material.

Question:

Why did you lie about being in college?

Answer:

The pole stores gravitational potential energy because it is bent from its natural shape when off the ground.

Explanation: i took the test

Both balls will reach the ground at the same time if there is no air resistance.

Gravity is a force that attracts objects with mass towards each other. When the ball is thrown horizontally, it will have an initial velocity in that direction, but it will also experience a downward force due to gravity. The horizontal component of the motion of the ball thrown forward has no effect on the time it takes for the ball to fall to the ground.

The vertical component of the ball thrown forward is the same as the ball dropped from the edge of the cliff, and both will experience the same acceleration due to gravity. Therefore, neglecting air resistance, both balls will hit the ground at the same time.

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Answer:

install socrati it give you all answers

Explanation:

If a ball is thrown horizontally with a speed of 65 miles per hour, then it would fall 4.32 meters while traveling 90 ft of horizontal distance.

There are three equations of motion given by  Newton

v = u + at

S = ut + 1/2×a×t²

v² - u² = 2×a×s

Note that these equations are only valid for a uniform acceleration.

As given in the problem If a ball is thrown horizontally with a speed of 65 mph, then we have to find out  how far will it fall while traveling 90 ft of horizontal distance,

1 mile = 1609 meters

65 miles = 65*1609 meters

               =104585 meters

65 miles per hour = 104585 meters per hour

The speed in meters per second = 104585/3600

                                                       =29.05 meters / second

1 feet = 0.3048 meters

90 feets = 90*0.3048

              =27.432 meters

The time is taken by the ball = 27.432/29.05

                                                =0.945

S = ut + 1/2*a*t²

   = 0 + 0.5*9.81*0.945²

S = 4.32 meters

Thus, the ball would fall 4.32 meters while traveling 90 ft of horizontal distance.

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Option. (B) The crest of one wave overlaps with the trough of another  is the best description of the destructive interference of light. The statement Option (B) Radio waves have longer wavelengths and lower frequencies than microwaves correctly compares radio waves and microwaves. Exposure to Option (A) infrared radiant energy is sensed by human skin as warmth. prism produces the colors of the rainbow from white light Option (C) by separating the light of different wavelengths. Option(C) Light moves in a straight line except at surfaces between different transparent materials, where its path bends.

Question 2The best description of the destructive interference of light is when the crest of one wave overlaps with the trough of another wave.

Destructive interference occurs when two waves combine to form a wave of lower amplitude.

When this happens, the crest of one wave overlaps with the trough of another, reducing the overall amplitude of the wave.

Question 4Radio waves have longer wavelengths and lower frequencies than microwaves.

This implies that they also have lower energy and are less dangerous than microwaves.

Microwaves have shorter wavelengths, higher frequencies, and higher energy than radio waves.

Question 6Exposure to infrared radiant energy is sensed by human skin as warmth.

This is because the infrared wavelengths correspond to thermal energy, which means that they cause molecules to vibrate faster and generate heat when absorbed by objects.

The sun is a source of infrared radiation that is sensed by our skin as warmth.

Question 8A prism produces the colors of the rainbow from white light by separating the light of different wavelengths.

When white light enters a prism, it is refracted and separated into its component colors because each color has a different wavelength.

This is because each color bends differently as it passes through the prism, which causes them to separate and form a rainbow of colors.

Question 10Light moves in a straight line except at surfaces between different transparent materials, where its path bends.

This bending of light is known as refraction and occurs because light travels at different speeds through different materials.

When light moves from one material to another, such as from air to glass, it changes speed and direction, causing its path to bend.

This is why lenses and prisms can be used to bend and focus light in specific ways.

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Answer:

You would weigh the same.

Explanation:

At the moment, since Earth is not a perfect sphere, the Earth "bulges out" at the equator, so you're further from the centre of the Earth. Since gravity acts through a body's center of mass, the further you are from the centre the weaker the gravitational acceleration you will feel, because gravity weakens over distance.

So, you're actually lighter at the equator than you'd be at the poles.

However, if the Earth was a perfect sphere, this "bulge" at the equator would not happen, and so you would weigh the same at the poles and at the equator.

Hope this makes sense.

Answer:

Explanation:

1. eectromagnetic Fields. Most of the processes that accelerate particles to relativistic speeds work with electromagnetic fields to the same force that keeps magnets on your fridge!

Magnetic Explosions

Wave-Particle Interaction's

Answer:

c. initial (x and y)

Explanation:

When a projectile is launched at a velocity with a launch angle, to solve it, we must first resolve the initial velocity into the x and y components. To do this will mean we have to treat it like a triangle due to the launch angle and the direction of the projectile.

Therefore, we will have to make use of trigonometric ratios which is also known by the mnemonic "SOH CAH TOA"

Thus, this method resolves the initial x and y velocities.

Answer:

The tension in the rope if it is parallel to the slope is 24.31 N.

Explanation:

Given;

mass of the sled, m = 9 kg

angle of inclination of the slope, θ = 16⁰

The tension in the rope if it is parallel to the slope is calculated from the parallel component of the tension;

\(T_|_| = mgSin \theta\\\\T_|_| = 9 \times 9.8 \times sin(16^0)\\\\T_|_| = 24.31 \ N\)

Therefore, the tension in the rope if it is parallel to the slope is 24.31 N.

Answer:

C

Explanation:

Winter in North

Summer in south