What do we mean by the event horizon of a black hole?A) It is the place where X rays are emitted from black holes.B) It is the very center of the black hole.C) It is the point beyond which neither light nor anything else can escape.D) It is the distance from the black hole at which stable orbits are possible.

Answers

Answer 1

Answer:

The correct answer is: C. It is the point beyond which neither light nor anything else can escape.

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Two vertical springs have identical spring constants, but one has a ball of mass m hanging from it and the other has a ball of mass 2m hanging from it. Part A If the energies of the two systems are the same, what is the ratio of the oscillation amplitudes?

Answers

Answer:

$(A_1)/(A_2)=1$

Explanation:

given,

two identical spring have identical spring constant

mass 'm' is hanging on one spring and mass of '2m' on another wall.

energy of the two system is same

energy of the system having mass 'm'

$E = (1)/(2)m\omega_1^2A_1^2$

energy of the system having mass '2m'

$E = (1)/(2)(2m)\omega_1^2A_1^2$

now, Energy are same

$(1)/(2)m\omega_1^2A_1^2= (1)/(2)(2m)\omega_1^2A_1^2$

$(A_1^2)/(A_2^2)=(2\omega_2^2)/(\omega_1^2)$

we know $k = mw^2$

$(A_1)/(A_2)=\sqrt{\frac{2(k)/(m_2)}{{(k)/(m_1)}}$

$(A_1)/(A_2)=\sqrt{(2m_1)/(m_2)}$

$(A_1)/(A_2)=\sqrt{(2m)/(2m)}$

$(A_1)/(A_2)=1$

Radiant heat transfers energy
A.) To nearby solid objects
B.) To the surrounding air

Answers

"One of the earliest methods of central heating involved the use of a boiler. In boiler systems, water is heated using a fossil fuel such as coal, oil, or propane. The water is allowed to convert to steam. It then travels through piping to the various rooms in the house. Each room has at least one radiator. As the name implies, heat energy radiates from this unit. When the heat energy (in the form of infrared waves) encounters solid objects in the room, those objects absorb the energy and warm up. Only a small amount of convection is involved in distributing heat from radiators."

"Radiant heat can also be obtained from electricity-based units. In these appliances, as electricity runs through wires, heat is generated. The wires may glow red. Again, this type of heat is radiated through the air and absorbed by solid objects. Many space heaters are radiant in design."

-Alpha Omega Academy, Unit 2 (Heat Flow), Assignment 5 (Heating Systems)

"Radiant heat passes through the air and heats solid objects making it highly efficient wherever it's installed. Because radiant heat is produced instantly, there is no need for expensive pre-heating. Infrared heaters provide heat and warmth quickly so you are able to save on the costs of heating seldom used areas."

-Article : How do radiant heaters work? - AEI Corporation

SO...

The answer is:

A) To nearby solid objects

Hope this helps! :)

By the way, I got this correct on my assignment!

Answer:

To nearby solids

Explanation:

Why do we insulate houses?A. To prevent heat transfer from inside to
the outside
B. To allow energy to flow from inside to
the outside
C. To keep them cool in the winter and
warm in the summer

Answers

B to allow energy to flow from inside to the outside

Why is carbon unique among the elements?????

Answers

Because no living organism can exist without carbon. It is the essence if life. Every single living thing that breathes or moves or produce is made up if carbon

Luke Autbeloe drops an approximately 5.0 kg object (weight = 50.0 N) off the roof of his house into the swimming pool below. Upon encountering the pool, the object encounters a 50.0 N upward resistance force (assumed to be constant). Use this description to answer the following questions. (Down is usually considered a negative direction) a. Which one of the velocity-time graphs best describes the motion of the object? Why?

Answers

The motion of the object is best depicted by graph B. Therefore, option B is correct.

This is because the object is initially accelerating downwards due to the force of gravity. However, when it encounters the pool, the upward resistance force counteracts the force of gravity, and the object's velocity slows down. The object will eventually reach a terminal velocity, where the upward resistance force is equal to the force of gravity, and the object will no longer accelerate.

Graph A shows a constant velocity, which is not possible in this case. Graph C shows an initial acceleration downwards, followed by an acceleration upwards. This is also not possible, as the object cannot accelerate upwards while it is still in contact with the pool. Graph D shows a constant acceleration downwards.

Learn more about motion, here:

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Graph B represents correct graph for velocity time Explanation:Initially the object is dropped under the influence of constant force due to gravitySo here we can say its acceleration is constant due to gravityhence here the velocity will increase downwards due to gravity and it is given asnow when it enters into the pool an upward force of same magnitude will act on itso net force on it is so here we will have no acceleration and it will move with constant speed after that so here correct graph is Graph B

What force results in charged particles?A] Contact Force

B] Gravitational Force

C] The Force Of Electromagnetism

D] Force Push

Answers

B gravitational forces

Answer:

The Force Of Electromagnetism

Explanation:

hope this helps u

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