Changes of state
Study the heating curve shown.
Which statement is best supported by the information in
the heating curve?
Heating Curve of a Substance
T
U
O At segment T-U, the substance changes from a liquid
to a gas and does not change temperature.
At segment T-U, the substance changes from a gas
to a liquid and changes temperature.
O At segment Q-R, the substance releases heat and
increases in temperature.
O At segment Q-R, the substance absorbs heat and
decreases in temperature.
Temperature (Cº)
R
20
s
o
Heat Added (J)

The weight watcher must climb : 3.45 km to work off the equivalent of a large piece of chocolate cake rated at 670 calories.

First step : convert the energy to joules

670 calories to Joules

E = 670 * 10³ * 4.184

  = 2803280 J

Next step : Equate energy to gravitational potential energy

2803280 J = mgh

2803280 = 82.9 * 9.8 * h

Therefore :

h = 2803280 / ( 812.42 )

  = 3451 m  = 3.45 Km

Hence we can conclude that The weight watcher must climb : 3.45 km

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Answer:

60600N

Explanation:

lnput =effort=202 N

Answer:

heat is removed.

Explanation:

hope this helps.

Answer:

energy is removed.

Because entropy is a dynamicquality realting to the system being unavaliable to do conversions because of the energy measures being low.

It makes it harder for the defense to cover you.

OD

Explanation:

both gravitational force and speed will increase

The gravitational force will increase and speed will decrease. So, the correct option is c.

Any two objects in the universe are attracted towards each other by the gravitational force, regardless of whether their masses are equal or not.

Here,

Newton's universal law of gravitation states that the force of attraction between any two bodies is inversely proportional to the square of the distance between them and directly proportional to the product of their masses.

So, the gravitational force of the satellite,

F ∝ 1/R²

where R is the radius of the circular orbit.

The equation for speed of the satellite is given by,

v = √Rg

where g is the acceleration due to gravity.

So, the speed is directly proportional to the square root of the radius of the orbit.

v ∝ √R

Therefore, as a result of the decrease in the radius of the orbit, the gravitational force of the satellite will increase, and its speed will decrease.

Hence,

The gravitational force will increase and speed will decrease.

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Answer:

increases as more components are added. 

Answer:

600 J

Explanation:

900 j = 300j = 600 j lost due to friction

Energy lost due to friction is 600 J.

The kinetic energy before and after friction is given as 900J and 300J.

   The force that resists the sliding or rolling over one object with another is called friction. The energy which possess in virtue of being in motion is said to be Kinetic Energy.

                                   f = μN

                      Energy lost = 900J - 300J

                                          =  600J

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The acceleration on a body of mass 2kg with a force of 25N is 12.5 m/s^2

Given Data

We know that the expression for the Relationship between force acceleration and Mass is given as

F = ma----------------1

Substituting our given data into the expression we have

25 = 2*a

Making acceleration the subject of the formula we have

a = 25/2

a = 12.5 m/s^2

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Answer: Z

Explanation: I took the quiz!! :3

During a solar eclipse as seen from Earth, the moon will be at the position Z.

When the Moon moves in front of the Sun, obstructing the Sun's view for a small portion of the Earth either completely or partially, this is known as a solar eclipse.

Here,

When the Moon is in its new moon phase, when its orbital plane is closest to that of the Earth's, and during eclipse season, such an alignment takes place roughly every six months. The Sun's disc is completely covered by the Moon during a total eclipse. The Sun is only partially covered by annular and partial eclipses. A solar eclipse can only be seen from a relatively restricted area of the earth, in contrast to a lunar eclipse, which can be seen from anyplace on the night side of Earth.

The Moon is parallel to the line connecting the Earth and the Sun at its first and final quarters. Only one-half of the Moon is visible to us as being illuminated by the Sun; the other one-half is hidden in shadow.

Hence,

During a solar eclipse as seen from Earth, the moon will be at the position Z.

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kinetic energy would beeeeeeeeeeeee 248 J

Increasing the resistance of a variable resistor wired in series with a light bulb will not affect the voltage drop on the bulb [FALSE].

A series circuit is a type of circuit arrangement, where the same current flows in each resistor of the circuit. Also Different voltage flow in each resistor of the circuit.

The total voltage drop in a series circuit is given as;

V = IR₁ + IR₂ + IR₃ + ----

V = I(R₁ + R₂ + R₃)

From the above equation, increase in the number of resistance, increases the voltage drop.

Thus, increasing the resistance of a variable resistor wired in series with a light bulb will not affect the voltage drop on the bulb [FALSE].

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1 mol = 6.022 × 10^23  atoms

1.7 x 10^24   x   1/(6.022 × 10^23) = 2.823 mol

Carbon has an atomic weight of 12.011 (grams per mol)

2.823 x 12.011 = 33.907053 g

Hope I'm right!

The rule is

[tex]\\ \rm\Rrightarrow F=k\dfrac{q_1q_2}{R^2}[/tex]

Put that

[tex]\\ \rm\Rrightarrow F=\dfrac{k(1.0\times 10'C)}{R^2}[/tex]

The electric force between the two charged objects is (1/4πε₀)(1 x 10')/R².

Electric force is defined as the attraction or repelling force that exists between any two charged objects.

Here,

The product of the charges on the objects, q₁ x q₂ = 1 x 10' C²

Distance between the charges  = R

According to Coulomb's law,

The electrostatic force,

F ∝ q²

F ∝ 1/R²

Therefore,

F = (1/4πε₀)(q₁q₂)/R²

where ε₀ is the permittivity of free space.

F = (1/4πε₀)(1 x 10')/R²

Hence,

The electric force between the two charged objects is (1/4πε₀)(1 x 10')/R².

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The study of the cosmos provides scientists with a knowledge of the material universe although limited due to lack accurate tools and equipments for the study of the cosmos.

The cosmos refers to the entire universe including the things found in them.

Understanding and explaining the universe has as always been of interest to humans both ancient and model.

Humans in ancient times earlier modelled the earth to be the centre of the universe known as the geocentric model.

A heliocentric model was proposed later to replace the geocentric model.

Both ways of modelling was limited as cosmologists did not have the tools to accurately observe outer space.

Today, advances in technology has provided powerful tool to ore accurately model the cosmos.

Therefore, the study of the cosmos provided humans with a knowledge of the material universe though limitations of accurate tools and equipments for the study of the cosmos still exist.

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Answer:

just use the formula λ = v/f

Explanation:

v = velocity

f = frequency

Answer:

.01 Hz

Explanation:

f = 1/period

 = 1 / 95.2 = .01 Hz

Answer:

37.4m/s

Explanation:

since the car doesn't accelerate, we can use the formula v=ωr where v is linear speed, ω is angular speed (rads/second) and r is radius. Substitute values for equation:

v=55*0.68

v=37.40

Answer:

Some motor tyre contain Graphite to contain friction.

Answer:

to contain friction

Explanation:

Answer:

Advantage: Mercury has a lower freezing point (-1140 degree Celsius)

Disadvantage: Mercury has a lower boiling point

Answer:

because it goes unlimited and goes as far as the astronomy asteroid belt goes

Answer:

6.67 cm

Explanation:

Given

Finding magnification

Finding image distance

Mirror formula

Solving

Answer:

The objects kinetic energy increases as it falls from some height.

Answer:

parallel circuit, hopefully I wasn't late in sending the answer

Answer:

I think the answer is 0.2 m/s2

Explanation:

Answer:

C

Explanation:

relative density is equal to 1 then the substance would sink in water

Explanation:

Let & mean "is proportional to"

F & [m(V - Vo)]/∆t

We can see that increase in the applied force equals increase in the change in momentum (increase in change of velocity).

Also,

An increase in the mass of the object requires more force to be applied for work to be done.

Intelligence is generally defined by the Individual IQ tests. Individual IQ tests are often administered by psychologists and take an hour to an hour and a half to complete.

The capacity for abstraction, logic, comprehension, emotional knowledge, reasoning, organization, creativity, rational reasoning, are all examples of intelligence.

Personal intellect or Intelligence quotient, given one-on-one by a psychotherapist, are the preferred process of measuring intellect.

Individual IQ tests are often administered by psychologists and take an hour to an hour and a half to complete.

Hence Intelligence is generally defined by the Individual IQ tests

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Answer:

a.A

Explanation:

when x=0, the power becomes 0 and the exponent becomes 1

anything to the power of 0 is 1

in addition, the exponent only applies to the 'e' term, hence the e term will become 1 and multiply A to give you A

Answer:

a the structure labelled as cell wall

Explanation:

a difference between plant cells and animal cells is the most animal cells are round whether most plant cells are rectangular. plants cells have a rigid cell wall that surrounds the cell membrane.animal cell do not have cell wall when looking under a microscope, the cell wall is an easy way to distinguish between animal and plant cells

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