Answer:
As the main sequence star glows, hydrogen in its core is converted into helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by nuclear fusion, the core becomes unstable and contracts
Explanation:
2. It is to bring down the foot forcibly to the f a heavy step) with or without weight. 2 Ormain lateral position - This is done at sho
Liquid pools of methane are found on the surface of Titan, one of Saturn's moons. The temperature on the surface of Titan is -180°C. What is this value on the Fahrenheit scale?
Answer:
-292 degrees F
Explanation:
C = 5/9( F -32)
-180 = 5/9 (F-32)
F = -292 degrees
Light of different colors is emitted from different stars because :.
Answer:
Different temperatures
Explanation:
Explain why we say that energy from the washing machine is wasted' as thermal energy?
Explanation:
In washing machine, the electrical energy is converted in kinetic energy then the mechanical energy is converted into thermal (heat) energy.
Which pair of triangles can be proven congruent by the hl theorem?
The pairs of triangles that can be proven congruent by the hl theorem is the right angled triangle.
What is mearnt be the HL theorm?The HL theorem is also known as the Hypothenus Leg theorem, it states that "the hypotenuse and leg of one right triangle are congruent to the hypotenuse and leg of another right triangle, then the two triangles are congruent."
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Answer:
B
Explanation:
A body travels a distance of 20m in the 7th second and 24m in the 9th second. How much distance shall it travel in the 15th second?
Answer:
36 m
Explanation:
We can consider this to be an AP.
Then,
a₇ = 20a₉ = 24Subtract a₇ from a₉.
a + 8d - a + 6d = 24 - 202d = 4d = 2a + 6(2) = 20a = 8Finding a₁₅
a₁₅ = a + 14da₁₅ = 8 + 14(2)a₁₅ = 8 + 28a₁₅ = 36 mFind rate of change
f(9)-f(7)/9-724-20/9-74/22m/sSo
Distance travel in 6 s
Speed×Time6(2)12mDistance in 15s:-
12+2436mA battery supplies ________ to the circuit.
Answer:
Electrical energy
Explanation:
Hope It helps you
In an experiment, two objects, object X and object Y, travel toward each other and collide. Data are collected about
each object before, during, and after the collision, as shown in the table. Which ofthe following pairs of data, when
used together to create two graphs, could verify the conservation of momentum? Select two answers.
A) Average force exerted on object X by object Y and time of collision, because these measurements can be used to determine the change in momentum of object X.
B) Average force excreted on object Y by object X and time it collision, because these measurements can be used to determine the change in momentum of object Y.
C) Mass of object X and velocity of object X before collision, because these measurements can be used to determine the initial momentum of object X.
D) Mass of object Y and velocity of object Y before collision, because these measurements can be used to determine the initial momentum of object X.
(a) Average force exerted on object X by object Y and time of collision, because these measurements can be used to determine the change in momentum of object X.
(b) Average force excreted on object Y by object X and time it collision, because these measurements can be used to determine the change in momentum of object Y.
What is conservation of linear momentum?The principle of conservation of linear momentum, states that in the absence of external force, the sum of initial momentum must be equal to sum of final momentum.
P = mv
where;
m is massv is velocityp is momentumF = mv/t
Ft = mv
J = Δmv
where;
J is impulse = FtΔmv is change in momentummass of object X and object Y are constant, and cannot be used create graphs.
Impulse (product of force and time) received by an object is equal to change in the momentum of the object.
Thus, the pairs of data that can be used together to create two graphs, to verify the conservation of momentum are;
(a) Average force exerted on object X by object Y and time of collision, because these measurements can be used to determine the change in momentum of object X.
(b) Average force excreted on object Y by object X and time it collision, because these measurements can be used to determine the change in momentum of object Y.
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What has 8 protons 10 neutrons and 10 electrons
Water is streaming downward from a faucet opening with an area of 3.0 x 10-5 m2. It leaves the faucet with a speed of 5.0 m/s. The cross sectional area of the stream 0.50 m below the faucet is:
The cross sectional area of the stream 0.50 m below the faucet is 2.54 x 10⁻⁵ m².
Speed of the water 0.5 m below the faucetThe speed of the water at the lower level is determined using Bernoulli's equation as follows;
P₀ + ρgΔh + ¹/₂ρv₁² = P₀ + 0 + ¹/₂ρv₂²
ρgΔh + ¹/₂ρv₁² = ¹/₂ρv₂²
gΔh + ¹/₂v₁² = ¹/₂v₂²
9.8(0.5) + ¹/₂(5)² = ¹/₂v₂²
2(17.4) = v₂²
34.8 = v₂²
v₂ = √34.8
v₂ = 5.9 m/s
Continuity equationA₁v₁ = A₂v₂
A₂ = A₁v₁ /v₂
A₂ = (3.0 x 10⁻⁵ x 5) / (5.9)
A₂ = 2.54 x 10⁻⁵ m²
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A 2-column table with 3 rows. The first column titled metal has entries aluminum, iron, lead. The second column titled density (grams per cubic centimeter) has entries 2.64, 7.50, 11.34.
You have discovered a meteorite that seems to be metallic. Its mass is 370 g, and you calculate the volume to be 50 cm3. Based on the three values provided, which metal would most likely match the composition of the meteorite?
aluminum
iron
lead
none of these (density is less than 1.0)
Iron,
I really hope this helped you
Explanation:
Answer:
Its just Cork and wax
Explanation:
I just did it on edge trust me
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If a unit positive charge is taken from one point to another over an equipotential surface, then
(a) work is done on the charge.
(b) work is done by the charge.
(c) work done is constant.
(d) no work is done.
Answer:
(d) no work is doneExplanation:
Since the potential at each point of an equipotential surface is the same, the potential does not change while we move a unit positive charge from one point to anotherTherefore work done in the process is zero or no work is doneAnswer:
No work done
Explanation:
When a unit positive charge us taken from one point to another over an equipotential surface then
As it's equipotential no Displacement will happenAs no Displacement hence dw=0
No work done
Suppose you are pushing a stalled car. As the gets going, you need less and less force to keep it going. For the first 15 m, your force decreases at a constant rate from 210.0 N to 40.0 N. How much work did you do on the car? Draw a force-displacement graph to represent the work done during this period.
Answer:
1875 j
Explanation:
f * d = work
your AVERAGE force is (210+ 40)/2 = 125 N
125 * 15 = 1875 j
The work done during this period will be 1875 J.. if the body is displaced in the same direction of the force it will be positive.
What is work done?Work done is defined as the product of applied force and the distance through which the body is displaced on which the force is applied.
Work may be zero, positive and negative.it depends on the direction of the body displaced
The given data in the problem is;
F is the average force applied by the worker
d is the displacement = 15 m
The average force is ;
[tex]\rm F_{AVG} = \frac{F_1+F_2}{2} \\\\ F_{AVG} = \frac{210+40}{2} \\\\ F_{AVG}=125 \ J[/tex]
The work done by the worker will be;
[tex]\rm W= Fd \\\\\rm W= F_{AVG}d \\\\W= 125 \times 15 \\\\ \rm W=1875 \ J[/tex]
Hence the work done during this period will be 1875 J.
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A small bar magnet pulls on a larger one with a force of 79 Newtons.
What is the magnitude of the force the larger one exerts on the smaller one?
Answer in units of N.
Answer:
79 N ( the same)
Explanation:
After you chew and swallow, food enters your digestive system where it can be broken down.
A.
True
B.
False
Answer:
A
Explanation:
Technically, your mouth is part of the digestive system though so I am not sure how accurate this question is.
If Frequency F, velocity v, and density D are considered fundamental units, the dimensional formula for momentum will be :
Let's see
Momentum be P
[tex]\\ \rm\Rrightarrow P=[Frequency]^a[velocity]^b[Density]^c[/tex]
[tex]\\ \rm\Rrightarrow [P]=[F]^a[v]^b[D]^c[/tex]
[tex]\\ \rm\Rrightarrow [M^1L^1T^{-1}]=[T^{-1}]^a[L^1T^{-1}]^b[M^1L^{-3}]^c[/tex]
[tex]\\ \rm\Rrightarrow MLT^{-1}=T^{-a}L^bT^{-b}M^cL^{-3c}[/tex]
[tex]\\ \rm\Rrightarrow MLT^{-1}=T^{-a-b}L^{b-3c}M^c[/tex]
On comaparing
c=1So
b-3c=1b-3=1b=1+3b=4and
-a-b=-1-a-4=-1-a=-1+4=3a=-3So the unit is
DV⁴/F³Answer:
(Frequency)⁻³(velocity)⁴Density
Explanation:
See attachments.
An electon in a box absorbs light. The longest wavelength in the absorbtion spectrum is 700 nm . How long is the box
Answer:
8.01 (10^-10) m
Explanation:
use the Particle in a box equation
E = (n^2) (h^2) / (8 m (L^2))
and energy of a particle as its wavelength equation
h c / lamda = E
combine the equations to get
h c / lamda = (n^2) (h^2) / (8 m (L^2))
get L alone
L^2 = (2^2 - 1^2) h lamda / 8 m c
the longest wavelength is produced by a jump from the first excited state to the ground so
n = 2 to n = 1
so
L^2 = (n1^2 - n2^2) h lamda / (8 m c)
h = 6.6(10^-34) J*s
c = 3(10^8) m/s
m = 9(10^-31) kg
lamda = 700(10^-9) m
n1 =2
n2=1
A corona is a circle of light that can be seen around the Moon during a solar eclipse.
O True
False
How would you compare the direction of the motion of the reflected pulse with respect to the incident pulse
The direction of the motion of the reflected pulse is inverted to that of the incident pulse.
What is a Pulse?This is a physics term which refers to the single disturbance that moves through a transmission medium.
The reflected pulse is inverted so the direction is from right to left while that of the incident pulse is from left to right.
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general effects of global warming
Answer:
Warmer temperatures over time are changing weather patterns and disrupting the usual balance of nature. This poses many risks to human beings and all other forms of life on Earth.Changes in temperature cause changes in rainfall. This results in more severe and frequent storms. They cause flooding and landslides, destroying homes and communities, and costing billions of dollars.Water is becoming scarcer in more regions. Droughts can stir destructive sand and dust storms that can move billions of tons of sand across continents. Deserts are expanding, reducing land for growing food. Many people now face the threat of not having enough water on a regular basis.Which phase of the moon is shown?
full moon
first quarter
waning gibbous
waxing crescent
Atoms with certain characteristics are radioactive. Which of those below will
always be radioactive?
A. all atoms with more neutrons than protons
B. all atoms with an atomic number under 83
C. all atoms with fewer neutrons than protons
D. all atoms with an atomic number over 83
Answer:
D. all atoms with an atomic number over 83
How would life on earth be different if its axis was not tilted with respect to its orbit?.
Answer:
oone side at a time would be hot and the other oone
Explanation:
One side will be hot and the other cold no in-between
5 A train of mass 1.5 X 105 kg is travelling at 40 ms-' when the brakes are applied and it decelerates steadily. The train travels a distance of 250 m before coming to a halt. (a) Calculate the deceleration of the train. (b) Find the average braking force.
Answer:
a)3.2m/s^2
b) -480,000N
Explanation:
mass of train= 150,000kg
velocity of train=40m/s
acceleration is negative
v^2=u^2-2as
v=0m/s
u=40m/s
s=250m
0=1600-500a
500a=1600
deceleration of 3.2m/s^2
newton's second law
F=ma
F= (150,000× -3.2)
F= -480,000N
1. What could be the structure in the volcano that serves as a source of
geothermal energy?
A. Caldera
B. Magma chamber C. Summit D. Vent
Answer:
it is magma chamber
Explanation:
Although time is one of those concepts which we are all familiar with, it is difficult to define. We can say it is what is measured by a clock or that it is nature's way of seeing that everything does not happen at once.
What are your Thoughts on this?
do you think time is real?
Explanation:
time is nature's expression of change.
every change takes time.
it takes time to e.g. move from A to B.
at one point of time the universe is in one state, then some change happens, and the universe is in another state, and we have another point of time.
without time there is no change, without change there is no time.
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Two copper spheres of the same radius, one solid and the other hollow, are charged to the same potential. Which will have more charge?
(a) Solid sphere
(b) Hollow sphere
(c) Both will have an equal charge
(d) None of these
C
Let's see how
We know the rule
[tex]\\ \rm\rightarrowtail V=\dfrac{Kq}{r}[/tex]
[tex]\\ \rm\rightarrowtail Kq=vr[/tex]
[tex]\\ \rm\rightarrowtail q\propto r[/tex]
As radius is same charge will be same in both
Hence they both have same charge
The zone in which the greatest total mass of co2 is absorbed from the atmosphere.
The top layer is the zone in which the greatest total mass of co2 is absorbed from the atmosphere.
What is exosphere?The exosphere is the uppermost layer of Earth's atmosphere, located between 700 and 10,000 kilometers above the surface and merging with the solar wind at its summit.
The exosphere is a narrow, ambience space that surrounds a planetary contains particles that are gravitational forces connected to that body yet have such a low density that they are effectively collisionless.
Hence, the top layer is the zone in which the greatest total mass of co2 is absorbed from the atmosphere.
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The table shows the speed of ultrasound waves in different tissues in the human body.
Tissue
Speed
(m/s)
Air 330
Fat 1,450
Water 1,480
Liver 1,550
Kidney 1,560
Blood 1,570
Muscle 1,580
Bone 4,080
What happens to an ultrasound wave that moves from muscle to bone?
(1 point)
The frequency of the wave decreases.
The frequency of the wave increases.
The wavelength of the wave decreases.
The wavelength of the wave increases
Answer:
the frequency of the wave increases
Answer:
The wavelength of the wave increases
Explanation:
Just did the test
What are two pieces of evidence that support the big bang theory?.