The definition of mechanical energy

QUESTION POSTED AT 14/02/2020 - 11:19 AM

Answered by admin AT 14/02/2020 - 11:19 AM

The definition of mechanical energy is power that an object gets from its position and motion.
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Related questions

The correct answer is c. Energy processing from corn biofuels is not energy efficient.

Exellent!!!!!!!!!!!!!!

ANSWERED AT 28/02/2020 - 05:17 PM


QUESTION POSTED AT 28/02/2020 - 05:17 PM

Amino acids cannot be broken down to provide energy.

False, Dietary proteins are first broken down to individual amino acids by various enzymes and hydrochloric acid present in the gastro-intestinal tract. These amino acids are further broken down to α-keto acids which can be recycled in the body for generation of energy, and production of glucose or fat or other amino acids.

ANSWERED AT 28/02/2020 - 04:42 PM


QUESTION POSTED AT 28/02/2020 - 04:42 PM

Nuclear energy is produced when scientists force uranium (U) atoms to break apart. With this in mind, examine the list below. If scientists were to break apart each of the items on the list, which items would still be classified in the same way? Which items would be classified differently? • atoms • elements • compounds • molecules • matter

Answer:

Compound.

Explanation:

A compound is a made up of two or more than two different elements. It can be broken down into smaller molecules.Elements are combined to form a compound by chemical bonding like ionic bonding and covalent bonding.

Different compounds of different elements can be broken down into the chemical reaction called decomposition reaction. For example:

Using electrolysis, we can break down water into its elements hydrogen and oxygen.    

ANSWERED AT 28/02/2020 - 04:06 PM


QUESTION POSTED AT 28/02/2020 - 04:06 PM

During a chemical reaction, energy is converted from one form to another increases decreases is used up as bonds are broken and formed

Is used up as bonds are broken and formed .

ANSWERED AT 28/02/2020 - 03:02 PM


QUESTION POSTED AT 28/02/2020 - 03:02 PM

The specific heat of nickel is 0.44 J/g*⁰C. How much energy needed to change the temperature of 95.4g of nickel from 22⁰C to 32⁰C. Is the energy absorbed or released?

Answer : The amount of energy needed is, 419.76 J and the energy is absorbed.

Solution :

Formula used :

Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})

where,

Q = heat gained or absorbed = ?

m = mass of nickel = 95.4 g

c = specific heat of nickel = 0.44J/g^oC      

\Delta T=\text{Change in temperature}  

T_{final} = final temperature = 32^oC

T_{initial} = initial temperature = 22^oC

Now put all the given values in the above formula, we get

Q=95.4g\times 0.44J/g^oC\times (32-22)^oC

Q=419.76J

The value of Q is positive that means energy is absorbed.

Therefore, the amount of energy needed is, 419.76 J and the energy is absorbed.

ANSWERED AT 28/02/2020 - 02:51 PM


QUESTION POSTED AT 28/02/2020 - 02:51 PM

What is an example of where energy transfer by conduction is a curringNOW ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

If you're feeling cold and you cuddle someone you'd feel better because the heat is transferred from their body to yours

ANSWERED AT 28/02/2020 - 02:42 PM


QUESTION POSTED AT 28/02/2020 - 02:42 PM

How many electrons are needed to completely fill the second level energy? The third? The fourth?

The maximum number of electrons that an energy level can hold is determined from the formula 2n^2 equals the total number, where n is the energy level.  The first energy level holds 2*1^2=2 electrons while the second holds 2*2^2= 8 electrons.

ANSWERED AT 28/02/2020 - 02:04 PM


QUESTION POSTED AT 28/02/2020 - 02:04 PM

Lifting a ball increases its what energy

Gravity because when you drop the gravity from the earth forces the ball down...but when yuo add more as in lifting the ball higher it becomes the gravtiy becomes stronger

ANSWERED AT 28/02/2020 - 01:00 PM


QUESTION POSTED AT 28/02/2020 - 01:00 PM

A ______ is a machine that converts mechanical energy to electrical energy. A. transmitter B. pulverizer C. generator

C.generator is the answer

ANSWERED AT 28/02/2020 - 12:47 PM


QUESTION POSTED AT 28/02/2020 - 12:47 PM

Why is activation energy required to start some reactions? A.)to break the bonds of an endothermic reaction B.)to overcome electron repulsion of an endothermic reaction C.)to overcome electron repulsion of an exothermic reaction D.)to provide sufficient energy to keep a reaction going

Answer: D.) to provide sufficient energy to keep a reaction going

Explanation:

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.  It is required for both endothermic and exothermic reactions.

The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.

ANSWERED AT 28/02/2020 - 11:30 AM


QUESTION POSTED AT 28/02/2020 - 11:30 AM

10.0 grams of octane are burned in a bomb calorimeter containing 2.00 × 102 g H2O. How much energy, in kilocalories, is released if the water temperature increases by from 25.00oC to 37.00oC?

An electron jumps from energy level 1 to energy level 2 by absorbing a photon of ... How many moles of methane are produced when 25.1 moles of carbon ... 10.0 grams of octane are burned in a bomb calorimeter containing 2.00 × 102 g H2O. ... is released if the water temperature increases by from 25.00oC to 37.00oC?

ANSWERED AT 28/02/2020 - 10:36 AM


QUESTION POSTED AT 28/02/2020 - 10:36 AM

What are examples of inferred energy?

When your hair is really wet so you have to use a hairdryer

ANSWERED AT 28/02/2020 - 07:17 AM


QUESTION POSTED AT 28/02/2020 - 07:17 AM

What are examples of potential energy?

Chemical energy from a battery is a potential form of energy, elastic energy in a stretched rubber band is a form of potential energy, but the most commonly referred to form of potential energy in physics is that of gravitational potential energy. This is energy that is stored due to an object's position

ANSWERED AT 28/02/2020 - 07:15 AM


QUESTION POSTED AT 28/02/2020 - 07:15 AM

What are some examples of kinetic energy

A car going down a hill

ANSWERED AT 28/02/2020 - 07:15 AM


QUESTION POSTED AT 28/02/2020 - 07:15 AM

HELLLLLLLLPPP Which of the following statements accurately describes renewable energy sources? They include fossil fuels and hydroelectric power. They take millions of years to form and should be used responsibly. They provide the majority of the energy for the United States. They are found in nearly limitless supply. QUESTION 2 Over the past 100 years, the amount of fossil fuel consumption has ___________. increased decreased stayed the same fluctuated QUESTION 3 One-quarter of the world’s coal reserves are found in what country? Russia Saudi Arabia Mexico United States

Answer:

1. They are found in nearly limitless supply.

Renewable resources are those which are abundantly present in nature and can be replenished again after single use. For example water, air and  sunlight.

2. increased

Over the past 100 years, the amount of fossil fuel consumption has increased because with the increase in the population cover all over the world, the requirement of fossil fuels is also increasing. Fossil fuels are required for the generation of thermal and electrical energy.

3. United States

The United States is the reservoir of coal. It is a chief exporter of the coal to India, Netherlands , Japan, South Korea and Brazil.

ANSWERED AT 28/02/2020 - 05:54 AM


QUESTION POSTED AT 28/02/2020 - 05:54 AM

Which of the following factors drives all the weather on Earth, including large-scale storms and local weather systems? The ocean holds thermal energy more efficiently than land. The greenhouse effect ensures that some thermal energy will always be trapped near the Earth's surface. The Sun heats up the air at different rates, and the atmosphere undergoes changes to equalize temperatures and pressures. The Coriolis effect curves the motion of wind due to the Earth's rotation.

Answer: The Sun heats up the air at different rates, and the atmosphere undergoes changes to equalize temperatures and pressures.

Explanation: The Sun's unequal heating of the air is the driving force behind all weather systems on Earth. As the atmosphere undergoes changes to equalize temperature and pressure, fronts and storms are created.

Hope this helps you.

ANSWERED AT 28/02/2020 - 05:40 AM


QUESTION POSTED AT 28/02/2020 - 05:40 AM

Tidal energy is generated from the

Solarpower panels and plants

ANSWERED AT 28/02/2020 - 05:26 AM


QUESTION POSTED AT 28/02/2020 - 05:26 AM

Nuclear energy can come from a. radioactive elements. b. nuclear power plants. c. certain types of rocks. d. all of these can produce nuclear energy.

D. all of these can produce nuclear energy

ANSWERED AT 28/02/2020 - 03:39 AM


QUESTION POSTED AT 28/02/2020 - 03:39 AM

Exit which of the following is true of gases? a. they have a definite shape. b. they have a definite volume. c. they have a relatively high density. d. they have the ability to diffuse through other gases.

They dont have definite shape, high density and volume.

But they can be mixed together very easily

hope you got your answer

ANSWERED AT 28/02/2020 - 03:37 AM


QUESTION POSTED AT 28/02/2020 - 03:37 AM

Chemical reactions that ____ energy will not occur without a source of energy

Chemical reactions that release energy will not occur without a source of energy.  So the answer is release.

ANSWERED AT 27/02/2020 - 01:14 PM


QUESTION POSTED AT 27/02/2020 - 01:14 PM

Which statement about the energy of a phase change is true? A.Melting is an endothermic change, because ice releases energy to its surroundings as it melts. B.Melting is an endothermic change, because ice absorbs energy from its surroundings as it melts. C.Melting is an exothermic change, because ice absorbs energy from its surroundings as it melts. D.Melting is an exothermic change, because ice releases energy to its surroundings as it melts.

Since with melting the solid absorbs the heat of the environment in order to get the energy needed to phase change from solid to liquid, it means that melting is endothermic.  

Evidence of this is that if you have a hot tea, and you put ice cubes in it along with a thermometer, as the ice melts you will realize that the temperature of the tea would decrease thus insinuating that heat was removed from the tea (absorbed by the ice to melt).

Answer:  OPTION B

ANSWERED AT 27/02/2020 - 10:08 AM


QUESTION POSTED AT 27/02/2020 - 10:08 AM

When 2.000 g of solid NaOH (∆Hsoln = -445.1kJ/mol) dissolves in 10.00 L of water, how much heat is released? A. 445.1 kJ B.44.51 kJ C. 22.26kJ D. 11.13 A catalyst causes _______. * • a change in the particle size of the products • a change in the temperature of the reactants • a lowering the activation energy barrier • a shift in the equilibrium position toward the products

For the first question, the correct answer would be 44.51 kJ. It is calculated by multiplying the amount of the substance in moles by the heat of the solution. For the second question, the correct answer would be a catalyst causes a lowering the activation energy barrier.

ANSWERED AT 27/02/2020 - 09:32 AM


QUESTION POSTED AT 27/02/2020 - 09:32 AM

According to the Arrhenius definitions of acids and bases, choose the bases from the list of acids and bases. Check all that apply. 1. Ba(OH)2 2. HIO3 3. H2CO3 4. CsOH

Answer: Bases from the list of acids and bases are Ba(OH)_{2} and CsOH.

Explanation:

According to Arrhenius, acids are the substance which when dissolved in water result in the formation of hydrogen or H^{+} ions. Whereas bases are the substances which releases hydroxide or OH^{-} ions when dissolved in water.

Therefore, out of the given options Ba(OH)_{2} and CsOH are the substance that will completely dissociate into ions and form hydroxide ions when dissolved in water.

ANSWERED AT 26/02/2020 - 11:41 PM


QUESTION POSTED AT 26/02/2020 - 11:41 PM