Answer:
When there is a point source used without directing the light or sound in a direction, the area of a sphere = 4πr 2 is used instead of the area of circle for calculating intensity. The minimum intensity of sound that a human can hear is 10 -12 Wm -2 and the maximum is 1 Wm -2.
Explanation:
The two rods are now firmly attached together as in Figure 2.
Sketch and explain what would happen they are heated [2 marks) Fixed and Figure 2
Thermal equilibrium is attained and the both rods are now at the same temperature.
What is thermal equilibrium?Two bodies are said to have attained thermal equilibrium when the two bodies at the same temperature. It should be known that when two rods are firmly attached to each other heat flows from one rod to another.
As such, after some time, thermal equilibrium is attained and the both rods are now at the same temperature.
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It's terrific fun to read what the original thinkers had to say for themselves. I read parts of Relativity: The Special and General Theory by Albert Einstein, and found the letter about Einstein forgetting to eat lunch in Einstein: His Life and Universe by Walter Isaacson.
—A Black Hole Is NOT a Hole,
Carolyn Cinami DeCristofano
Choose the most likely reason why the author selected Einstein's work as a source for her book.
It was published recently.
It contains Einstein's opinion.
It uses serious language.
It reflects Einstein's expert knowledge.
Answer:
it contains Einsteins opinion
Answer:
Answer is D
Explanation:
<3
i need help question confuseing
Answer:
could you tell me what the question is pls, that way I can help you
Explanation:
Calculate: a student lifts an apple to a height of 1 m. The apple weighs 1 N. How much work does the student do on the apple? Type out your calculations
Answer:
1J
Explanation:
Work done = force × distance
1 × 1 = 1
Work done = 1J
J = Joules
why is electromagnet are called temporary magnet
pls its urgent
Answer: because when you remove the battery, the the magnet no longer has electricity flowing through it, therefore the magnetic field disappears. Thats why its called a temporary magnet
Explanation:
A 10^3 kg load is placed on top of a lead bar of length 3.0 m. If the bar is compressed by 2.0
mm, calculate the cross-sectional area of the bar.
The cross-sectional area of the lead bar is [tex]9.188 \times 10^{-4} \ m^2[/tex].
Young's modulus of lead barThe Young's modulus (E)of lead bar is given as 1.6 x 10¹⁰ Pa.
Cross-sectional area of the barThe cross-sectional area of the bar is calculated as follows;
[tex]E = \frac{stress}{strain} = \frac{F/A}{e/l} = \frac{Fl}{Ae} \\\\A = \frac{Fl}{Ee}[/tex]
where;
A is cross-sectional areaF is applied force due to its weightE is Young's moduluse is compressionl is length[tex]A = \frac{(mg) l}{Ee} \\\\A = \frac{(10^3 \times 9.8) \times 3}{1.6 \times 10^{10} \times 2 \times 10^{-3}} \\\\A = 9.188 \times 10^{-4} \ m^2[/tex]
Thus, the cross-sectional area of the lead bar is [tex]9.188 \times 10^{-4} \ m^2[/tex].
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Brainliest if correct
Answer:
the answer is C. rocket 4.
Explanation:
[tex]a = \frac{f}{m} \\ \\ c) a = \frac{120}{3.25} = 36.923...[/tex]
it's the biggest amongst the four.
rocket one has an acceleration of 34.782...
rocket two has an acceleration of 22.429...
rocket three has an acceleration of 26.666...
rocket four has an acceleration of 36.923
what is the kinetic energy of an object that has a mass of 12 kg and moves with a velocity of 10 m/s
Answer:
600 J
Explanation:
The formula to find the kinetic energy of an object is [tex]\frac{1}{2}mV^2[/tex]
m = mass in kgV = velocity in m/sKE is measured in Joules just as all other forms of energy.Now, let's plug in the variables we're given and simplify.
[tex]\frac{1}{2}(12)(10)^2[/tex] [tex]\frac{1}{2}(12)(100)[/tex] [tex](6)(100)[/tex] [tex](600)[/tex]Thus, the answer is 600 Joules.
Nowadays, the average person encounters more than a hundred advertisements a day, be it in the form of TV and radio commercials, billboards, online promotions, and print ads, among many others. From all the advertisements you encounter, which one caught your attention? Why? Looking at the root of it, what was the underlying cause of the promotion? What does it target? Whom does it target? How does it convey message to target clientele? Is the promoted product a trend or a fad? ESSAY WRITTING PLEASE HELP ME
The essence of the commercial is to draw the attention of the public to the products of a firm.
What is a commercial?Commercials are the primary ways by which companies promote their products. The essence of the commercial is to draw the attention of the public hence the commercial is designed with music graphics and other means that aid effective communication.
The commercial that got my attention is that of the United Bank for Africa owing to the beautiful blend of orchestra music used in the advertisement which appeals immediately to the mind. The advert targets the business class in the society and aims at granting soft credit to small and medium scale entrepreneurs. It conveys its message to the clientele via music. The advert can be regarded as a trend.
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If the vector below is multiplied by 2, what will be its end point?
Vector multiplied by constant (scalar number),the new vector
becomes k |a|. If k> 0, the same direction, k <0, the opposite direction
If we multiply vector A by 2 then the length becomes 2 times vector A and in the same direction
first point (-1,1)
end point after multiplied: 2(-1,1) ⇒(-2,2)
How does the evolutionary process contradict the second law of thermodynamics?
How does the nature of heat explain the occurrence of high temperature in a human body that has a fever?
Explanation:
THE BODY INCREASES THE RATE OF HEAT LOSS TO BALANCE THE HEAT BURDEN.Help me pls, ASAP..
____1. These are motion graphs that show a change in an object’s location over time.
____2. It can show us if an object is going backwards or forwards (direction).
____3. These are useful and effective tools in visually presenting the motion of objects.
____4. It is the line of dots on the tape that is created when a long tape is attached to
an object that is moving.
____5. It is a periodic disturbance that moves away from a source and carries energy with it.
____6. It is the maximum displacement of a particle of the medium on either side of its
normal position when the wave passes.
____7. It is a measurement of how fast the sound wave vibrates.
A. Amplitude
B. Displacement-time graph
C. Frequency
D. Motion graphs
E. Position-time graphs
F. Ticker tape diagram
G. Wave
[tex] \qquad \huge \underline{ \boxed{\sf Answer}}[/tex]
Here's the correct choices for the blank questions~
# 1 : position - time graph
#2 : Displacement - time graph
#3 : Motion graphs
#4 : Ticker tape diagram
#5 : Wave
#6 : Amplitude
#7 : Frequency
The answers to the questions are as follows :
Position time graphs ( E ) Displacement time graph ( B )Motion graphs ( D )Ticker tape diagram ( F ) Wave ( G ) Amplitude ( A ) Frequency ( C ) The different types of motion graphsPosition time graphs are motion graphs that show the change in an object position in relation to time traveled, while a displacement time graph shows if an object is going backwards or forward and unlike distance, she does not consider the direction of movement of an object.
Motion graphs are used for the presentation of the motion of objects visually.
Hence we can conclude that the answers to your questions are as listed above.
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The mass of an empty density bottle is 2 g. Its mass when filled with water is 4.0 g and 6.0 g when filled with liquid X. Calculate the density of liquid X if the density of water is 1,000 kgm-3.
Answer:
density of liquid x = 2000kg/m3
Explanation:
mass of water = mass of bottle with water - mass of bottle
mass of water = 4g - 2g
mass of water = 2g
mass of liquid x = mass of bottle with liquid x - mass of bottle
mass of liquid x = 6g - 2g
mass of liquid x = 4g
since the mass of liquid x is double the mass of the water and the volume of the bottle is the same, the density is doubled
density of liquid x = 1000kg/m3 • 2
density of liquid x = 2000kg/m3
The pressure on a volume of liquid V = 1.0 mº at the surface is approximately equal to the atmospheric pressure Patm = 1.00 x 105 N/m2. If this volume of liquid is now
placed at a depth where the pressure is P = 2.30 x 10' N/m², what will be the change in volume of the liquid (in mº)? The bulk modulus of the liquid is 8.0 x 100 N/m².
(Include the appropriate sign with your answer.)
m
Additional Materials
Answer:-2.86*10⁻⁴
Explanation: Use the equation change in volume = (change in pressure * original volume) / Bulks Modulus. ΔV = (-Δp*V₀) / B
Plugging in your numbers, you should get ΔV = (-2.29*10⁷*1) / (8*10¹⁰) = -2.86*10⁻⁴
ΔP = P₂-P₁ ----> ΔP = 2.30*10⁷ - 1.00*10⁵ = 2.29*10⁷
The top point on a 64-cm-diamotor rolling bicycle wheel has an instantaneous speed of 14 m/s.
How many revolutions will the wheel make in 14 s?
Express your answer in revolutions.
The number of revolutions the wheel will make in 14 s is 97.5 revolutions.
Angular speed of the wheelThe angular speed of the wheel is the rate of change of angular displacement with time.
ω = v/r
where
r is radius of the wheel = 32 cmω = 14/0.32
ω = 43.75 rad/s
Number of revolutions in 14 secondsФ = ωt
Ф = 43.75 rad/s x 14s
Ф = 612.5 rad
N = (612.5 rad) / (2π)
N = 97.5 revolutions
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A car starts from rest and travels for 5.0 s with a constant acceleration of
-1.5 m/s. What is the final velocity of the car? How far does the car travel
in this time interval?
Explanation:
Explanation:
If an object having initial velocity
uExplanation:
If an object having initial velocity
u
is applied an acceleration of
a
for
t
time, its final velocity
v
is given by
v
=
u
+
a
t
and distance covered
S
is given by
S
=
u
t
+
1
2
a
t
2
.
We have
u
=
o
(as the object starts from rest),
t
=
5
sec., and acceleration
a
=
−
1.5
m
sec
2
.
Hence final velocity
v
=
−
1.5
×
5
=
−
7.5
m
sec
.
Distance covered
S
=
1
2
×
(
−
1.5
)
×
5
2
=
−
18.75
m
.
Minus sign indicates that acceleration is in reverse direction.
is applied an acceleration of
a
for
t
time, its final velocity
v
is given by
v
=
u
+
a
t
and distance covered
S
is given by
S
=
u
t
+
1
2
a
t
2
.
We have
u
=
o
(as the object starts from rest),
t
=
5
sec., and acceleration
a
=
−
1.5
m
sec
2
.
Hence final velocity
v
=
−
1.5
×
5
=
−
7.5
m
sec
.
Distance covered
S
=
1
2
×
(
−
1.5
)
×
If an object having initial velocity
u
is applied an acceleration of
a
for
t
time, its final velocity
v
is given by
v
=
u
+
a
t
and distance covered
S
is given by
S
=
u
t
+
1
2
a
t
2
.
We have
u
=
o
(as the object starts from rest),
t
=
5
sec., and acceleration
a
=
−
1.5
m
sec
2
.
Hence final velocity
v
=
−
1.5
×
5
=
−
7.5
m
sec
.
Distance covered
S
=
1
2
×
(
−
1.5
)
×
5
2
=
−
18.75
m
.
Minus sign indicates that acceleration is in reverse direction
5
2
=
−
18.75
m
.
Minus sign indicates that acceleration is in reverse direction.
A rotating lens mechanism blocks the view of the object as the new lenses are rotated. Be sure to click each lense firmly into place. If you do not the field will be only partially visible. What kind of mechanism is on your microscope?
I think that mechanism is called a "lens turret".
Is it possible to hold friendships outside of your designated group Why or Why not?
Answer: Yes it is possible.
Explanation: The reason is being because, people tend to like to see different stuff. Like in the movie Pocahontas she was a totally different person. And John Smith was a different person too. SO it is possible.
A projectile is launched with an initial speed of 40 mys from the foor of a tunnel whose height is 30 m. What angle of elevation should be used to achieve the maximum possible horizontal range of the projectile?
Answer:
We are given the trajectory of a projectile:
y=H+xtan(θ)−g2u2x2(1+tan2(θ)),
where H is the initial height, g is the (positive) gravitational constant and u is the initial speed. Since we are looking for the maximum range we set y=0 (i.e. the projectile is on the ground). If we let L=u2/g, then
H+xtan(θ)−12Lx2(1+tan2(θ))=0
Differentiate both sides with respect to θ.
dxdθtan(θ)+xsec2(θ)−[1Lxdxdθ(1+tan2(θ))+12Lx2(2tan(θ)sec2(θ))]=0
Solving for dxdθ yields
dxdθ=xsec2(θ)[xLtan(θ)−1]tan(θ)−xL(1+tan2(θ))
This derivative is 0 when tan(θ)=Lx and hence this corresponds to a critical number θ for the range of the projectile. We should now show that the x value it corresponds to is a maximum, but I'll just assume that's the case. It pretty obvious in the setting of the problem. Finally, we replace tan(θ) with Lx in the second equation from the top and solve for x.
H+L−12Lx2−L2=0.
This leads immediately to x=L2+2LH−−−−−−−−√. The angle θ can now be found easily.
As an object falls the gravitational potential energy of the object is converted into ?
Answer:
the gravitational potential energy is converted to kinetic energy
Explanation:
Because the conversation of the energy as a tool permits the calculation of the velocity just before it hits the surface
Do you believe that
we are changed by the people who come into our lives
(good or bad)? In what ways do the people we allow in
our lives change us? Do we always have a choice in the
ways they change us? What about experiences and
traumas, do they change us as well? In what ways can
your life change after certain experiences or traumas?
Give examples to explain your answer.
Answer:
In my opinion, I think we do change when people come to our lives because the way we feel around people makes us feel a certain way around all people in our lives in a good way. They can change our lives by being there and helping us physically and mentally. We do have the choice to follow what someone is trying to change us. Example if we have a problem like addiction, we can choose to get help from anyone or choose not to. Traumas can affect us, but we need to seek help to not fear those problems anymore, thats why people who care about us really want us to change our way of health, addictions, and mental health. For me, as a child my dad was deported because he got a dui and decided for as punishment to be deported or to have a life sentence in the U.S. My mom suffered addiction to drugs and alcohol. I lived with my grandparents for almost my whole childhood untill the age of 9. Then my aunt got engaged and my new uncle decided to take us in because DC.S foound out that me and my other sibling weren't in school at all. Like we never attended school. So we were going to be seperated and taken for adoption untill my uncle had the heart to adopt us and here I am today. He gave us a better life because I finally experienced school,clothes, food, and a safer place to live. All the things I went through even abuse. He changed my life and we changed his. He cares about us, we helped him quit drinking, and that impacts him a lot to open up his heart and quit drinking.
Explanation:
Is this an example of outline??And why?
Answer:
Yes
Explanation:
You included all the stages of matter and described each of them. You're outlining their properties and you've created a clear diagram (and by diagram I mean chart) of solids, liquids, and gas.
Which describes the magnetic field that forms when a wire carries an electric current?
It is in a line perpendicular to the wire.
It is in a line parallel with the wire.
It is in a cylinder around the wire.
It is in a cylinder across the wire.
Answer:
It is in a line parallel with the wire.
Explanation:
trust me
Answer:
b on edge
Explanation:
yes
A 2kg rock is at the edge of a cliff 20m above the surface of a lake. It comes loose and falls. Half
way down it is falling at 14 m/s. What is its Kinetic Energy at the moment it hits the water?
Please show work!
Awesome to see a chainsaw man fan! Here's your answer!
Answer:
Follow:
Explanation:
Facts - Key Details Given:
mass of the rock: m = 2 kgheight of the cliff: h = 20 mspeed of the rock at the halfway point: v = 14 m/s---------------------------------------------------------------------------------------------------Calculations: #1: The potential energy (P.E) and kinetic energy (K.E) when its at the top;P.E = mgh
P.E = (2)(9.8)(20)
P.E= 392 J
K.E = ¹/₂mv²
where;
v is velocity of the rock at the top of the cliff = 0
K.E = ¹/₂(2)(0)²
K.E = 0
#2: The potential energy (P.E) and kinetic energy (K.E) at the halfway point;P.E = mg(¹/₂h)
P.E = (2)(9.8)(¹/₂ x 20)
P.E = 196 J
K.E = ¹/₂mv²
where;
v is velocity of the rock at the halfway point = 14 m/s
K.E = ¹/₂(2)(14)²
K.E = 196 J.
What kind of force draws certain types of metal together?
O A. Friction
O B. Nuclear
O C. Magnetic
O D. Weight
A magnetic force is the answer
right answer gets brainliest, wrong answer gets ignored
The star Sirius has a temperature of 10,700 degrees Celsius and has a luminosity of 23 solar luminosity units. At which letter on the HR Diagram would you place Sirius?
Answer:
A
Explanation:
Because A looks like it's in the 10,700 degree area and also in the 23 luminosity area.
help please help help helphelp
Answer:
∠ABD = 100°
∠CBD = x
we have to find the value of x .
Since ∠ABD & ∠CBD formed on straight line.
Then Sum of ∠ABD & ∠CBD is 180° ( by linear pair)
[tex] \dashrightarrow\sf \: 100 {}^{ \circ} + x \: = 180 {}^{ \circ} \\ \\ \dashrightarrow\sf \:x \: = 180 {}^{ \circ} - 100 {}^{ \circ} \\ \\ \dashrightarrow\sf \:x \: = 80 {}^{ \circ} [/tex]
So, the value of x is 80° .
♧ Supplementary angles add up to 180 degrees
The equation for these angles is:x + 100 = 180
Subtracting the 100 degrees from both sides, we get the value of the unknown angle :x = 180 - 100
So , X = 80 °Hope it helps ~
Devon is riding his bicycle at 15 m/s. How far will he travel in 12 s?
Assuming that (1) the solar luminosity has been constant since the Sun formed, and (2) the Sun was initially of uniform composition throughout, as described by Table 9.2, estimate how long it would take the Sun to convert all of its original hydrogen into helium. [Hint: Calculate the mass of hydrogen in the sun and then divide it by the rate of hydrogen fusion]
Based on the mass and luminosity of the Sun, the time required to convert of its original hydrogen into helium is 7.505 × 10^10 years.
What is nuclear fusion?Nuclear fusion is the process whereby nucleus of lighter atoms are fused together to produce heavier atoms with the release of large amounts of energy.
Nuclear fusion occurs at the core of the sun where four hydrogen atoms are fused to form one helium atom with the release considerable energy, and this is known as hydrogen fusion.
The mass of the Sun = 2.0 × 10^30 kg
The Sun’s hydrogen mass is 0.71 × 2.0 × 10^30 kg = 1.42 × 10^30 kg.
The Sun converts 6 × 10^11 kg of hydrogen into helium per second.
Time required to convert all of the Sun's hydrogen to helium = 1.42 × 10^30 kg/6 × 10^11 kg/s
Time required = 2.367 × 10^18 seconds
Converting to years:
3.154 × 10^7 seconds = 1 year
2.367 × 10^18 seconds = 2.367 × 10^18 seconds * 1 year/3.154 × 10^7 seconds
Time required = 7.505 × 10^8 years
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