1) potential energy+kinetic energy is equal to
A. Gravitational potential energy
B. Thermal energy
C. Chemical energy
D. Mechanical emergy

2) …….. is the study of the composition & properties of matter
A. Ecology
B. Biology
C. Chemistry
D. Model
E. Atoms

3) building blocks of matter are called…
A. Mass
B. RNA
C. Neutrons
D. Atoms
E. Protons

4)the force you apply to a machine is the..
A. Efficiency
B. Input force
C. Output force
D. Resistance

5) friction within machinery increases efficiency
A. True
B. False
Please help<3

Answer:

D -- 12

Explanation:

Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Also remember to rate answers to help other students, While leaving thanks to answers that help you. Have a great day!

Blood travels through the body in tubes called arteries and veins.

Blood vessels are tubes through which the blood circulates in the body. Blood vessels include the following;

Thus, we can conclude that blood travels through the body in tubes called arteries and veins.

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Answer:

D.

Explanation:

The answer should be D. because if it increases by a factor of 2 then it will decrease at a factor of 4.

I hope it helps! Have a great day!

Anygays-

Answer:

Speed Formula:

[tex]s = \frac{d}{t} [/tex]

Answer:

It is called Motion Energy

Explanation:

Answer:

yes

Explanation:

as speed is a scalar quantity and velocity is a vector quantity. Which means speed only depends on the magnitude at which it travels but velocity depends on the speed at which travel and also the direction to where the object travels.

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Answer:

200 Nm

Explanation:

Work Done by Particular Force = Particular Force × Distance

Answer:

W=Fd

This is the equation for it

Initial speed u= 0.0 m/s

Final speed v= 5.0 m/s

Time t1= 4.5s

Time for constant speed t2=4.5s

d = d₁ + d₂

1 = ( v+u/2) × 1₁ + v × 1₂

v = final speed

u = initial speed

t₁ = time for first accelerates

t2 = time for constant speed

d = (5+0/2) × 4.5+ 5.0 x 4.5

d = 33.75m

so, the total distance traveled by the bike is 33.75 m.

# 1

[tex]\bold{a = \frac{(5-0)}{4.5} = 1.11 m/s^2 }[/tex]

[tex]\bold{ v = 0 + a \: t = 1.11 \times 4.5 = 5 }[/tex]

[tex]\bold{ d = 0 + 0 (4.5) + (\frac{1}{2})(1.11)(4.5)^2 =11.2 }[/tex]

# 2

[tex]\bold{ a = 0 }[/tex]

[tex]\bold{ v = 5 }[/tex]

[tex]\bold{ d = 11.2 + 5 (4.5) + 0}[/tex]

[tex]\bold{ = 11.2 + 22.5 = 33.7 meters}[/tex]

Answer:

The first reactant is methane, the next is oxygen, the first product is carbon dioxide and the second product is water.

The word equation is:

methane + oxygen → carbon dioxide + water

The balanced symbol equation is:

CH₄ + 2O₂ → CO₂ + 2H₂O

Explanation:

In any combustion reaction, fuel is burned in the presence of oxygen to produce carbon dioxide and water.

An equation is balanced when there are the same number of atoms of each element on both sides of the arrow.

Hope this helps!

Answer: i would say true uwu

Explanation:hope this helps!

  ....Max-

Answer:

W = 1/2 x P x E

Explanation:

Let :

Formula

Solving

Let's see

[tex]\\ \rm\rightarrowtail W=P\vec{E}(cos\theta_i-cos\theta_f)[/tex][tex]\\ \rm\rightarrowtail W=P\vec{E}(cos0-cos60)[/tex]

[tex]\\ \rm\rightarrowtail W=P\vec{E}(1-1/2)[/tex]

[tex]\\ \rm\rightarrowtail W=\dfrac{P\vec{E}}{2}[/tex]

Answer:

An induced magnetic field is always opposed to the change that produced the magnetic field.

Thus, such a bar magnet will be slowed on its descent thru the pipe because it will produce a current in the pipe that will produce a magnetic field in an opposite direction to the field that produced the current.

(a repelling magnetic field will produce a force that opposes the force producing it - otherwise one has a way to produce pertpetual motion)

Answer:

amount and speed of traffic on the acceleration lane and expressway.

Answer:

[tex]40h[/tex]

Explanation:

Use the velocity formula to solve

[tex]v = \frac{d}{t}[/tex]

In this question, you are given velocity [tex]v = 45km/h[/tex], and you are given a distance, [tex]d = 1800km[/tex].  Time in this question is what you'll need to find.

Start by rearranging the velocity formula, to isolate for t.

[tex]v = \frac{d}{t}[/tex]

Start by multiplying both sides by t

[tex]v(t) = \frac{d}{t}(t)\\\\vt = d[/tex]

Then divide both sides by v.

[tex]vt\frac{1}{v} = d/v\\ \\t = \frac{d}{v}[/tex]

Now that you've isolated for time, sub in your values and calculate.

[tex]t = \frac{d}{v} = \frac{1800km}{45km/h} = 40 h[/tex]

(1) The thermal energy absorbed by the Carnot engine is 7.15 x 10⁸ J.

(2) The thermal energy lost per hour by the Carnot engine is 2.75 x 10⁸ J.

The thermal energy absorbed by the heat engine is calculated as follows;

[tex]Q_h = \frac{P\Delta t}{1 - T_c/T_h}[/tex]

where;

[tex]Q_h = \frac{(122,000) \times (3600)}{1 - \frac{282}{731} } \\\\Q_h = 7.15\times 10^8 \ J[/tex]

The thermal energy lost per hour by the heat engine is calculated as follows;

[tex]Q_c = Q_h - P\Delta t\\\\Q_c = (7.15 \times 10^8 )\ - \ (122,000 \times 3600)\\\\Q_c = 2.75 \times 10^8 \ J[/tex]

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The composite figure is a combination of a rectangular pyramid and a rectangular prism, hence its volume is 140in³.

A rectangular prism is simply a three dimensional solid shape with six faces that are rectangles.

Volume of a rectangular prism is expressed as;

V = w × h × l

Where l is length, h is height and w is width

A rectangular pyramid is simply a three-dimentional object with a rectangular shaped base and triangular shaped faces that correspond to each side of the base.

The volume of rectangular pyramid is expressed as;

V = (1/3) × l × w × h

Where l is the base length, w is the base width and h is the height of the pyramid.

From the diagram below;

First we calculate the volume of a rectangular prism.

V = w × h × l

V = 3in × 4in × 7in

V = 84in³

Hence, the volume of the rectangular prism is 84in³.

Next, we calculate the volume of rectangular pyramid.

V = (1/3) × l × w × h

V = (1/3) × 7in × 3in × 8in

V = (1/3) × 168in³

V = 56in³

Hence, the volume of the rectangular pyramid is 56in³.

Volume of the composite figure = Volume of prism + Volume of pyramid

Volume of the composite figure = 84in³ + 56in³

Volume of the composite figure = 140in³

Therefore, the composite figure is a combination of a rectangular pyramid and rectangular prism, hence its volume is 140in³.

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Answer:

36.04N

Explanation:

accelerating force: mass × acceleration

F=ma

m=212/10= 21.2kg

a=1.7m/s2

F=21.2×1.7

=36.04N

Explanation: a reduction in genetic diversity and discomfort for animals that have very exaggerated characteristics.

Answer:

B. has the greatest mass

Explanation:

mass & distance affect pull

grativy affects speed & shape of orbit of the planet

quiziz

The sound intensity level of 100 physics professors talking simultaneously is equal to 72 decibel.

Given the following data:

Sound intensity can be defined as a measure of the power of a sound wave per unit area. Thus, sound intensity is a quantity that can be used to measure the energy of sound and its unit of measurement is Watts per square meter.

Mathematically, sound intensity level is given by this formula:

[tex]\beta = 10 log(\frac{I}{I_{ref}} )[/tex]

Note: The reference value of sound intensity is equal to [tex]1.0 \times 10^{-12}\;W/m^2[/tex]

Thus, the sound intensity for one (1) professor is given by:

[tex]I_1 = 1.0 \times 10^{-12} \times 10^{5.2}\\\\I_1=1.585 \times 10^{-7}\;W/m^2[/tex]

For 100 professors, the sound intensity is:

[tex]I_{100} = 1.585 \times 10^{-7} \times 100\\\\I_{100}=1.585 \times 10^{-5}\;W/m^2[/tex]

Substituting the parameters into the formula, we have;

[tex]\beta = 10 log(\frac{1.585 \times 10^{-5}}{1.0 \times 10^{-12}})\\\\\beta = 10 log(15.58 \times 10^{6})\\\\\beta = 10 \times 7.2\\\\\beta =72\;dB[/tex]

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Complete Question:

One physics professor talking produces a sound intensity level of 52 dB. It's a frightening idea, but what would be the sound intensity level of 100 physics professors talking simultaneously?

Answer:

72dB

Explanation:

The sound intensity level of one prof is given, that's your β1 (which is equal to 52dB).

Using the sound intensity level formula:

β1= 10log ([tex]\frac{I}{I_{o} }[/tex]) = 52 dB

*This will be useful later on [even if β1 is known]

Set up the formula for β2 (β2 is going to be the new sound intensity, the one for the 100 profs):

β2 = 10 log( [tex]\frac{ 100 I}{I_{o} }[/tex] )

*You need to multiply the intensity of one professor by 100 (because now there's more)

*do some algebra- pull out the 100

β2  = 10 log (100 [tex]\frac{I}{I_{o} }[/tex])

*use log laws

β2 = 10 ( log(100) + log ([tex]\frac{I}{I_{o} }[/tex]) )

*Now, isn't there a familiar part? Well, yes! The expression for β1!

β2 = 10log(100) + β1

β2 = 10log(100) + 52dB

*use your calculator

β2 = 73dB

^^^ that's your new sound intensity level

Answer:

Explanation:

Answer:

weight = 30000 Newton

Given:

========================

[tex]\sf pressure \ (Pa)=\dfrac{force \ (N)}{area \ (m^2)}[/tex]

[tex]\dashrightarrow \sf \ 60 000 = \dfrac{force}{0.5}[/tex]

[tex]\dashrightarrow \sf \ force =60 000 *0.5[/tex]

[tex]\dashrightarrow \sf \ force =30000 \ N[/tex]

========================

Weight is the force due to gravity.

Thus, force = gravity = 30000 N

 The work done on the car due to friction is -125 J.

Work is said to be done when a force moves an object through a certain distance.

To calculate the workdone on the car by friction, we use the formula below

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, The work done on the car due to friction is -125 J.

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Force(F) = 150N

Mass(m) = 90kg

Acceleration(a) = ?

F= m×a

[tex]150 = 90 \times \text{a} \\ \\ \text{a} = \frac{150}{90} \\ \fbox{cancelling by 3} \\ \\ \text{ a} = \cancel \frac{150}{90} \\ \\ \text{ a} = \frac{5}{3} = 1.67 \text{m/s} {}^{2} [/tex]

[tex] \therefore \text{Option A= 1.67 m/s² is the correct answer}[/tex]

Answer:

A. 1.67 m/s2

Explanation:

F = m*a, so a = F/m = 150/90 ≈ 1.67 [tex]m/s^2[/tex]

Answer:

B) sublimation

Explanation:

An example is the vaporization of frozen carbon dioxide (dry ice) at ordinary atmospheric pressure and temperature.

Answer:

sublimation

Explanation:

sublimation, in physics, conversion of a substance from the solid to the gaseous state without its becoming liquid. An example is the vaporization of frozen carbon dioxide or dry ice(CO2)

or Solid Chlorine (Cl2) at ordinary atmospheric pressure and temperature. The phenomenon is the result of vapour pressure and

temperature relationships.

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Answer:

1 / f = 1 / i + 1 / o             1 / f = (o + i) / i o

f = i o / (o + i)

f = -26.5 * 8.25 / (8.25 - 26.8)

f = -221 / -.308 = 11.8 cm

Answer:

See below

Explanation:

KE = 1/2 m v ^2

    = 1/2 (250/1000) 300^2   j         the bullet is 250/1000  kg  ( assuming g is grams and not GRAINS - in which bullet weight is usually measured)

force to stop it is the same number

PE = mgh = .5 *9.81  *  .75 =

     doubling height will double PE

2 x 10^6  =  40 * 9.81  *  h      sove for 'h' in meters  

Initial kinetic energy is 11250 J and magnitude of force to stop bullet is 75 N.

The GPE for 0.75m height floor is 3.75J.

The GPE for double of 0.75m height is 7.5J.

The high on which 40 kg mass is lifted is 5000m.

The kinetic energy of an object is the energy that it possesses due to its motion.

[tex]KE = 1/2 m v ^2[/tex]

      [tex]=1/2 (250/1000) 300^2 J\\= 11250 J[/tex]

Work done,

[tex]W= fs\\\\f=\frac{W}{s}\\\\f=\frac{11250}{150}[/tex]

[tex]f=75 N[/tex]

Gravitational potential energy is the potential energy a massive object has in relation to another massive object due to gravity.

PE = mgh

    = .5 *9.81  *  .75

    = 3.75 J

Potential energy when height doubles = 7.5J

The potential energy is given by

[tex]PE = mgh\\\\h = PE/ mg\\\\h = 2*10^6 J /40*9.8\\\\h = 5000 m[/tex]

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Answer:

When oil is spilled in the sea it will normally break up and be dissipated or scattered into the marine environment over time. This dissipation is a result of a number of chemical and physical processes that change the compounds that make up oil when it is spilled. The processes are collectively known as weathering.

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