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3 years ago

If an object weighing 32lbs is acted upon by a net force of 32 lbs, what will be its acceleration?

2 answers:

6 0

That"s exactly the situation when you drop the object off the roof or out of a tree... then the net force on it is the ONLY force on it, I.e. the force of gravity, and its acceleration is the acceleration due to gravity ... 32 ft/sec^2 .

ohaa [14]3 years ago

6 0

the acceleration would be 0 because lifting force up Is the same as the gravity going down. And therefore will not accelerate. The object has no net force

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Question 8: Cosmology (8 points)

STatiana [176]

Big bang happened about 13.7 billion years ago in our universe.

<h3>Describe the beginning of the universe according to the big bang theory?</h3>

According to the big bang theory, about 13.7 billion years ago, an explosive expansion began, expanding our universe outwards faster than the speed of light.

<h3>Describe the future of the universe according to the flat model?</h3>

According to the flat model, the universe is infinite and will continue to expand forever because the universe is expanding.

<h3>What is cosmic background radiation? </h3>

Cosmic background radiation is a weak radio-frequency radiation that is traveling through outer space in every direction. It is the residual radiation of the big bang, when the universe was very hot.

<h3>How do observations of the cosmic background radiation provide evidence to support the big bang theory? </h3>

The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe has all over radiation which is called the “cosmic microwave background".

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6 0

1 year ago

An object is placed in a fluid and then released. Assume that the object either floats to the surface (settling so that the obje

Irina18 [472]

Answer:

A. Always true

Explanation:

This is because, the buoyancy force is always present whenever and object is placed in a fluid. The magnitude of this buoyancy force is always equal to the weight of the fluid displaced by the object according to Archimedes' principle. This principle is true irrespective of whether the object floats or not. When any object is inserted in a fluid, the buoyancy force is always present irrespective of whether it floats or not.

7 0

3 years ago

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Heat energy is transferred by conduction whenever molecules?

Rama09 [41]

<em>The heat transfer by conduction occurs due to the collision between the molecules in the substance.</em>

Explanation:

The heat transfer between the substances or in a medium is carried out by means of three methods.

Conduction
Convection
Radiation

The conduction is the process of transfer of heat within the substance by transferring the heat one by one to each molecule throughout the substance by colliding with the neighboring molecule. This method prevails in the transfer of heat in the solids.

The convection is the process of transfer of heat in which the source of heat is used to heat a particular bunch of molecules or a layer of the substance and then that layer moves away from the source and lets other molecule to come close to the layer. This method of heating is used in liquids.

The radiation is the process of transfer of heat in the medium by means of the energy carried by the radiation. This process of heating is used for the heating of the gases in the medium.

Thus, <em>The heat transfer by conduction occurs due to the collision between the molecules in the substance.</em>

Learn More:

1. Which one is a compound machine brainly.com/question/9060219

2. Equinoxes occur when brainly.com/question/1000562

3. Explanation for the salinity of ocean water brainly.com/question/2752734

Answer Details:

Grade: Middle School

Subject: Physics

Chapter: Heat transfer

Keywords:

heat energy, transferred, conduction, convection, radiation, molecules, solids, liquids, medium, substance, transfer.

8 0

3 years ago

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You stand new the earth's equator. A positively charged particle that starts moving parallel to the surface of the earth in a st

Talja [164]

Answer:

c. from south to north

Explanation:

since we know that:

F = qv×B

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where v is the velocity due east

the field must be due north by the right hand rule

Therefore, near the equator the magnetic field lines of the earth are directed north from south

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3 years ago

What is Hubbles Law?

Whitepunk [10]

Answer:

Explanation:

Hubble's law is considered the first observational basis for the expansion of the universe and today serves as one of the pieces of evidence most often cited in support of the Big Bang model.The motion of astronomical objects due solely to this expansion is known as the Hubble flow.

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3 years ago

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