3. The sum of gravitational potential energy and kinetic energy is called mechanical
energy. Use Figure 2 to find the mechanical energy of an idealized pendulum at a
variety of times in its cycle. Identify any pattern you notice in the values of
mechanical energy.
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Answer:

Explanation:

It is a physical change. The reason is that when a straight piece of wire is coiled to form a spring, its chemical properties do not change. Only the physical property ( shape ) of the wire changes.

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Answer:

See below

Explanation:

If a piece of wire is coiled to form a spring, it is a physical change. This is because there is no change in it's bonds rather there is a change in its shape and figure. Also, Physical change is reversible such that the coiled piece of wire can be changed back to a straight piece of wire. But, A chemical change is irreversible.

So, This is a physical change.

Answer:

magnesium + hydrochloric acid → hydrogen gas + magnesium chloride

explanation:

the nitrogen in HNO3 is in the +5 oxidation state and is easily reduced. The reduction would result in the oxidation of the hydrogen gas, forming the water once again.The sulfur in H2SO4 is also in its highest oxidation state, +6.

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Answer:

False

Explanation:

I hope this explanation was clear and comprehensive.

Answer:

Forests prevent desertification.

Explanation:

Answer:

crude oil

Explanation:

The substance X would be crude oil.

Crude oil is a non-renewable natural resource that is black and thick in appearance. It is a mixture of several products and these are often separated by a process known as fractional distillation.

Some of the products from the fractional distillation of crude oil include the premium motor spirit (petrol), automotive gas oil (diesel), kerosene, etc., and derivatives for the production of dyes, paints, perfumes, etc.

Answer:

C. H2O (l) --> H2O (g)

Explanation:

Hello,

In this case, we need to remember that processes absorbing energy are those that have positive heat, it means, process that obtain energy from a certain source. In such a way, processes that need energy, in terms of phase chance are fusion, sublimation and evaporation, which are the change from solid to liquid, solid to gas and liquid to gas respectively. Therefore, for the given options, we can see that C. H2O (l) --> H2O (g) accounts for an evaporation process which actually absorbs energy.

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Answer:

No

Explanation:

No, as sometimes objects with large masses are very light since they aren't dense.

Answer:

Kinetic energy=1/2mv^2.

1/2×65×2.5^2.

1/2×6.5×6.25.

1/2×40.625.

=20.3125Joules.

The branch of science which deals with the chemicals bond is called chemistry.

The correct answer is 20.3125J

The energy formed by the motion of particles is called kinetic energy. The formula is half of the product of the mass and velocity.

[tex]Kinetic\ energy=\frac{1}{2}mv^2.[/tex]

After putting the value:-

[tex]\frac{1}{2}*65*2.5^2.[/tex]

After solving the equation, the kinetic energy is 20.3125Joules.

Hence, the correct answer is 20.3125Joules.

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Answer:

Heat transferred, Q = 1542.42 J

Explanation:

Given that,

Mass of water, m = 30 grams

Initial temperature, [tex]T_i=25^{\circ} C[/tex]

Final temperature, [tex]T_f=12.7^{\circ} C[/tex]

We need to find the energy transferred. The energy transferred is given by :

[tex]Q=mc\Delta T[/tex]

c is specific heat of water, c = 4.18 J/g °C

So,

[tex]Q=30\ g\times 4.18\ J/g-^{\circ} C\times (12.7-25)\ ^{\circ} C\\\\Q=-1542.42\ J[/tex]

So, 1542.42 J of energy is transferred.

Answer:

most likely water

Explanation:

most likely it is water, however pressure plays a role, if you are at sea level the boiling point of water is 100°C but if you are on Mt. Everest it is 71°C, assuming she is slightly above sea level it is water.

Answer:

9.5 inches = 24.1 cm

Explanation:

Given that,

1 inch = 2.54 cm

We need covert 9.5 inches to cm. For this we will use unitary method. To convert 9.5 inches to cm multiply 2.54 and 9.5. So,

9.5 inches = (2.54 × 9.5) cm

9.5 inches = 24.13 cm  

or

9.5 inches = 24.1 cm

Hence, this is the required solution.

Answer:

It's importance is the fact that you cannot solve s situation if you don't know it's problem.

Explanation:

Problem identification or identifying a problem by scientist I a major and a key step in solving a problem.

I mean, if you don't identify a problem, there is no way you can think about the solution not to talk of getting the solution.

So identification of a problem is infact one of the major step a scientist must take to solve a situation.

It's importance is the fact that you cannot solve s situation if you don't know it's problem.

Answer:

Average atomic mass = 63.3896

Explanation:

Step 1: Find how much Cu-65 we have

1 - Amount of Cu-63 = Amount of Cu-65

1 - 0.6915 = Amount of Cu-65

Amount of Cu-65 = 0.305

Step 2: Find the average atomic mass of Cu

(0.6915 x 63) + (0.305 x 65) = Average atomic mass

(43.5645) + (19.825) = Average atomic mass

63.3895 = Average atomic mass

Therefore the average atomic mass of Cu is 63.3895 atomic mass units

Answer:

The probability  of spinning red with the spinner or rolling an odd number with the  die is [tex]\dfrac{1}{8}[/tex]

Explanation:

Given that,

Total color in spinner = 4

Let the area of four parts is equal in the spinner.

We need to calculate the probability of spinning red

Using formula of probability

[tex]P(A) = \dfrac{Number\ of\ red\ color\ outcome}{Total\ number\ of\ colors\ in\ the\ spinner}[/tex]

Put the value into the formula

[tex]P(A)=\dfrac{1}{4}[/tex]

We need to calculate the probability of odd number of the die

Using formula of probability

[tex]P(B) = \dfrac{Number\ of\ odd\ digits\ outcome}{Total\ number\ of\ digits\ in\ the\ die}[/tex]

Put the value into the formula

[tex]P(B)=\dfrac{3}{6}[/tex]

[tex]P(B)=\dfrac{1}{2}[/tex]

We need to calculate the probability  of spinning red with the spinner or rolling an odd number with the  die

Using formula of probability of two events which is independent

[tex]P(A\ and\ B)=P(A)\times P(B)[/tex]

Put the value into the formula

[tex]P(A\ and\ B)=\dfrac{1}{4}\times\dfrac{1}{2}[/tex]

[tex]P(A\ and\ B)=\dfrac{1}{8}[/tex]

Hence, The probability  of spinning red with the spinner or rolling an odd number with the  die is [tex]\dfrac{1}{8}[/tex]

Answer:

KI

Explanation:

Answer:the answer c

Explanation: because he believes that properties of elemets are periodic function of there atomic number

Answer:

B. [tex] 5 \times {10}^{ - 5}\: m [/tex]

Explanation:

[tex]0.00005 \: m= 5 \times {10}^{ - 5} \: m \\ [/tex]

Answer:

51096J/mol = Energía de activación para el proceso del canto

Explanation:

Podemos solucionar este problema usando una forma de la ecuación de Arrhenius:

[tex]Ln\frac{K_2}{K_1} = \frac{-Ea}{R} (\frac{1}{T_2} - \frac{1}{T_1} )[/tex]

Donde K representa la velocidad de reacción (En este caso, la velocidad a la que cantan los grillos), Ea es la energía de activación, R la constante de los gases (8.314J/molK) y T representa la temperatura absoluta de 1, el estado inicial y 2, el estado final.

Estado inicial: K1 = 2.0x10²; T1 = 27°C + 273.15 = 300.15K

Estado final: K2 = 39.6; t2 = 5°C + 273.15 = 278.15K

Reemplazando en la ecuación:

[tex]Ln\frac{39.6}{2.0x10^2} = \frac{-Ea}{8.314J/molK} (\frac{1}{278.15K} - \frac{1}{300.15K} )\\\\-1.6195 = \frac{-Ea}{8.314J/molK}*2.6351x10{-4}K{-1}[/tex]

Answer:

The correct option is;

D Global warming would decrease the surface tension of water, making it harder for water striders to walk on water

Explanation:

Global warming involves the heating of the ecosystems on Earth due to human activity, which results in rising temperatures

As the temperature of the water rises due to global warming the surface tension decreases due to the increasing ratio of the force of higher kinetic energy water molecule to inter-molecular cohesive forces pulling the water together, which tends to weaken the effect of the cohesive forces and thus reduce the surface tension

As the surface tension has been reduced, the water striders will find it difficult to walk on the water surface as the maximum weight the water surface can lift without shearing, due to surface tension is reduced.

Answer:

3 × 10¯¹⁰

Explanation:

9×10² ÷ 3×10¹²

The above expression can be evaluated as follow:

9×10² ÷ 3×10¹²

Recall:

3² = 9

3¹ = 3

Therefore,

9×10² ÷ 3×10¹² = 3²×10² ÷ 3¹×10¹²

Recall:

y^m ÷ y^n = y^(m – n)

Therefore,

3²×10² ÷ 3×10¹² = 3²¯¹ × 10²¯¹²

= 3¹ × 10¯¹⁰

Recall:

y¹ = y

Therefore,

3¹ × 10¯¹⁰ = 3 × 10¯¹⁰

Therefore,

9×10² ÷ 3×10¹² = 3 × 10¯¹⁰

Answer:

E. the procedure

Explanation:

In scientific experiments, several steps are taken in order to achieve a significant result. However, the steps involved when performing the experiment should be taken note of and written down in a very comprehensible manner. The written step by step process involved in an experiment is called the PROCEDURE.

A procedure should be a guide to performing the experiment by a new experimenter. It should include everything done during the experiment. In this case, Mrs. Integer is telling Mrs. Apex to write down all she is doing during the experiment in a step by step manner. In essence, the principal is simply asking her to write a PROCEDURE.

Answer:

4.748 seconds

Explanation:

second-order is one in which the rate is proportional to the square of the concentration of one reactant. This can be expressed below;

2A----->P

Where

A is the reactant.

P is the product.

The rate can be expressed as

Rate= k[A]^2

Half-life reffers to time required to reduce the concentration of reactant to half of its initial value.

The half life of reaction can be calculated using below formula

Half-life =. 1/(K*I)

Where,

K = Rate constant = 0.54 1/ms

I = Initial concentration = 0.39 m

If we substitute these values we have

Half-life t(1/2) =1/(0.54×0.39)

=4.748 seconds

Therefore, the half life is 4.748 seconds

Answer:

Bow and arrow

Explanation:

A bow and arrow need accuracy to hit a target. It needs precision to hit the small target

Answer:

Krypton.

Explanation:

By Graham's Law:

Rate 1 / Rate 2 = sqrt M2 / sqrt M1

Molecular Mass for Neon  is 20.18

so we have:

38 / 77.5  =  sqrt 20.18 / sqrt x    where x is the unkown gas.

sqrt x = 9.162

x = 83.94.

This gas is Krypton.

A sample of neon effuses from a container in 38 s. The same amount of an unknown noble gas requires 77.5 s. The unknown gas is krypton.

The noble gases are a group of chemical elements that share several characteristics. They are all monatomic, odorless, and colorless gases with relatively little chemical reactivity under normal conditions. Helium, neon, argon, krypton, xenon, and radioactive radon are the six types of noble gases that are found in nature.

Due to their filled valence shells (octets), which render them incredibly nonreactive, the noble gases (Group 18), which are found in the far right of the periodic table, were formerly known as the "inert gases."

Due to their fully filled outer electron shells and lack of propensity to react with other elements, noble gases which are most frequently found as monatomic gases rarely form compounds with other elements.

By Graham's Law ;

Rate 1 ÷ Rate 2 = sqrt M2 ÷ sqrt M1

The Molecular Mass for Neon  is 20.18

Then,

38 ÷ 77.5  =  sqrt 20.18 / sqrt x    

where x is the unknown gas.

sqrt x = 9.162

x = 83.94.

This is Krypton gas.

Thus, The unknown gas is krypton which is noble gas.

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Answer:

Hydrogen reacts with oxygen to form a compound called hydrogen peroxide so your answer is none of the above.

Explanation:

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Answer:oxide

Explanation:

The reaction ofhydrogen and oxygen result on hydrgen peroxide which is a part is oxide

Answer: C

Explanation:

Spaghetti and meatballs are Heterogeneous mixture. A heterogeneous mixture is a mixture that is not uniform in composition throughout the mixture.

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Answer:

it is A as both are always charged

Explanation:

Answer: A the particle is always charged

Explanation: