Answer:
plastics are susceptible to degradation due to ultraviolet (UV) light from the sun. With enough exposure, UV light can cause a chemical reaction in the plastic, which results in scission, or severing, of those big polymer molecules.
Explanation:
Answer:
the short answer is yes and sun or strong uv lights
Explanation:
LEDs cannot melt plastic fixtures as they just do not get that hot, not even at the base These new bulbs are based on field-induced polymer electroluminescent (FIPEL) technology, with a twist. Without heat as a continual stressor, the polymer should remain stable for years. Any kind of light bulbs, from fluorescent to incandescent to halogen, can cause fires if they are not used correctly. As more heat is put into the plastic, more bonds are broken and the material becomes more like a liquid and less like a solid. Semi-crystalline polymers have a melting temperature which is the point at which the secondary bonds in the crystalline regions break. At this point the mateiral is completely liquid. There is melt and there is soften. Certainly they soften and become weak in sunlight both by the heat and by the UV degredation of the plastic. Unfortunately, the plastics used for garbage bags have a low melting point but by design, they should not melt in strong sunlight. the underlined sentences are the most important
QC A string fixed at both ends and having a mass of 4.80g , a length of 2.00 m , and a tension of 48.0 N vibrates in its second (n=2) normal mode. (b) What is the ratio of the wavelength in air of the sound emitted by this vibrating string and the wavelength of the wave on the string?
The ratio of the wavelength in air of the sound emitted by this vibrating string and the wavelength of the wave on the string is 2:1.
Frequency of the wavef = n/2L(√T/μ)
where;
n is number of nodesL is length of the stringT is the tension of the springμ is mass per unit lengthμ = 0.0048 kg / 2 m = 0.0024 kg/m
f = 2/(2 x 2) (√48/0.0024)
f = (¹/₂)(√20,000)
f = (¹/₂)(141.42)
f = 70.71 Hz
Speed of sound in stringv = √T/μ
v = (√48/0.0024)
v = 141.42 m/s
wavelength of the wave on the stringλ = v/f
λ = (141.42) / (70.71)
λ = 2 m
Wavelength in air of the sound emittedSpeed of sound in air, v = 332 m/s
λ = v/f
λ = 332 / 70.71
λ = 4.7 m
Ratio of the wavelengths = 4.7 m / 2m = 2.3/1 ≈ 2 : 1
Thus, the ratio of the wavelength in air of the sound emitted by this vibrating string and the wavelength of the wave on the string is 2:1.
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Why d/dt(a+bt^2)=2bt
Because a is not a function of t .
So d/dt of a is zero.
A car has a speed of 12m/s. The mass of the car and its passengers is 1250 kg. What is the total momentum of the car/passengers? (assuming the car moves in the positive direction)
p= kgm/s
Answer:
15000kgm/s
Explanation:
Given parameters:
Speed of the car = 12m/s
Mass of car and passengers = 1250Kg
Unknown:
Momentum of the car = ?
Solution:
Momentum is the quantity of motion a body posses;
Momentum = mass x velocity
Now insert the given parameters and solve;
Momentum = 12 x 1250 = 15000kgm/s
Una cantidad de aire se lleva del estado a al estado b siguiendo una trayectoria recta en una grafica PV como es mostrado en la figura. Suponga que la expansión es desde un volumen de 0.06 metros cúbicos a un volumen de 0.13 metros cúbicos y que la presión aumenta desde 125,432 pascales a 168,793 pascales.¿Cuánto trabajo efectúa el gas en este proceso?
Answer:
El trabajo de frontera ejercido por el gas es 10,297.875 joules.
Explanation:
Supongamos que el gas se comporta idealmente y que el proceso es isotérmico y adiabático. El trabajo efectuado por el gas en el proceso equivale al área bajo la curva de la gráfica PV. Puesto que es una línea recta y que tanto la presión como el volumen son variables positivas, tenemos que esa área es la suma del rectángulo inferior (límite inferior de la presión) y el triángulo superior (entre los límites inferior y superior de la presión). Es decir:
[tex]W = P_{min}\cdot (V_{2}-V_{1})+\frac{1}{2}\cdot (P_{max}-P_{min})\cdot (V_{2}-V_{1})[/tex] (1)
Donde:
[tex]W[/tex] - Trabajo de frontera ejercido por el gas, medida en joules.
[tex]V_{1}[/tex], [tex]V_{2}[/tex] - Volúmenes del gas antes y después de la expansión, medidas en metros cúbicos.
[tex]P_{min}[/tex] - Límite inferior de la presión del gas, medida en pascales.
[tex]P_{max}[/tex] - Límite superior de la presión del gas, medida en pascales.
Si sabemos que [tex]V_{1} = 0.06\,m^{3}[/tex], [tex]V_{2} = 0.13\,m^{3}[/tex], [tex]P_{min} = 125,432\,Pa[/tex] y [tex]P_{max} = 168,793\,Pa[/tex], entonces el trabajo de frontera ejercido por el gas es:
[tex]W = (125,432\,Pa)\cdot (0.13\,m^{3}-0.06\,m^{3})+\frac{1}{2}\cdot (168,793\,m-125,432\,m) \cdot (0.13\,m^{3}-0.06\,m^{3})[/tex]
[tex]W = 10,297.875\,J[/tex]
El trabajo de frontera ejercido por el gas es 10,297.875 joules.
Is question II correct?
Answer:
it most likly right I'm not 100% sure
Which two statements correctly describe transmutation?
Answ. B and C
Explanation:
The two statements which correctly describes transmutation include the following:
The number of atom is not conserved.The parent and daughter elements are different.What is Transmutation?This is the process of conversion of a chemical element into another with the atomic nuclei being changed.
Transmutation has true statements which are mentioned above thereby making option B and C the most appropriate choice.
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PPL how many types of turtles are there
Explanation:
356 species of diff turtles
5. An object accelerates from 10km/h at a rate of 5m/s2. What distance has the object traveled when it
reaches a speed of 50km/h?
Explanation:
de06dyoirad0tsxgoyddyppdy
Which forms of heat transfer do not require matter(particles) to happen? (Select all that apply)
Conduction
Convection
Radiation
None of these
Answer:
Radiation
Explanation:
The form of heat that does not require matter or particles to happen is known as radiation.
Radiation is a form of heat that is carried by electromagnetic spectrum. It does not depend on particles of the medium. Convection and conduction depends on the particles in the medium for heat transfer. Conduction and convection cannot occur in a vacuum. Radiation can transfer heat in a vacuum.Which statement best explains the relationship between the electric force between two charged objects and the distance between them? A. As the distance increases by a factor, the electric force increases by the square of that factor. B. As the distance increases by a factor, the electric force increases by twice that factor. C. As the distance increases by a factor, the electric force decreases by twice that factor. D. As the distance increases by a factor, the electric force decreases by the same factor. E. As the distance increases by a factor, the electric force decreases by the square of that factor.
Answer: I think it’s C but I’m not completely sure about it please correct me if I’m wrong
hi i need help pls help me
Answer:
best answer would be a
Explanation:
d is just a law
c is just the start of a paragraph
and b would be a revision or addtion to the already amendments
When two polarizers are overlapped, what angle relative to one another will allow for all of the incoming light to be blocked? *
Answer:
90°
Explanation:
The intensity of the transmitted light is proportional to the square of the cosine of the angle between polarizer axes. That cosine is zero when the angle is 90°.
define direct current
Answer:
DC (direct current) is the unidirectional flow or movement of electric charge carriers (which are usually electrons). The intensity of the current can vary with time, but the general direction of movement stays the same at all times.
Direct current is produced by rectifiers, batteries, generators with commutators, and fuel cells. For example, the current flowing in appliances running on batteries or in a flashlight is a direct current.
A 90.5-kg cannon is loaded with a 104-gram ball. The cannon is fired and propels the ball forward. A photogate measurement determines that the cannon recoiled backwards with a speed of 20.8 m/s. Determine the speed of the ball.
Answer:
18100 m/s.
Explanation:
conservation of momentum can be applied in solving this question, by using below expresion
mv = MV
where M = mass of recoil of canon =90.5kg
V =velocity of recoil of canon = 20.8 m/s.
m= mass of tennis ball=204g=104x 10⁻³kg
v = velocity of tennis ball
104 x 10⁻³ x v = 90.5 x 20.8
We can make V subject of formula
v = (90.5 x 20.8) / 104 x 10⁻³
v = 18100 m/s.
Hence, the speed of the ball is 18100 m/s.
describe free fall and weightlessness ?
weightlessness is the complete or near complete absense of the sensation of weight.
when in freefall,the only force acting upon your body is the force of gravity a noun contact force.since the gravity cannot be felt without any other opposing forces,you would have no sensation of it.you would feel weightless when in a state of freefall.
a ball is thrown upward at 25 m/s from the ground. what distance has the ball travelled after 5 seconds?
Answer:
125m
Explanation:
25m/s x 5 = 125
A 75.0kg diver falls from a 3.00m board into the water. She goes 2.40m into the water before stopping. What is the average force the water exerted on the diver?
Answer:
The potential energy of the diver at the top is equal to the net work needed to be done to stop the diver.
PE = W
mg(h+d) = Fd
Explanation:
Consider an electric field that is uniform in direction throughout a certain volume. Can it be uniform in magnitude? Must it be uniform in magnitude? Answer these questions (a) assuming the volume is filled with an insulating material carrying charge described by a volume charge density
The electric field cannot and must not be of uniform magnitude if the volume is filled with an insulating material carrying charge described by a volume charge density
Consider a gaussian surface in the shape of a rectangular box with two faces perpendicular to the direction of the field. Also, assuming this surface has a volume charge density that fills it up, it would therefore contain some charge. The net flow out of this box is nonzero. The field must be stronger on one side than the other. The field's magnitude cannot be uniform. Because the field’s magnitude cannot be uniform, therefore it is also impossible for it to be mandatorily uniform. A uniform magnitude thus defies gaussian postulate.
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Which is the work required to move a charge?
O electric field
O electric field line
O electric potential
O electric potential energy
Answer:
O electric potential
Explanation:
Answer:
[tex]electric \: potential[/tex]
Explanation:
[tex]hope \: helps \\ and \: brainliest \: if \: helped[/tex]
a electron with an initial speed of 500,000 m/s is brought to rest by an electric field. what was the potential difference that stopped electron? m
The potential difference that stopped electron is 1.422v
potential difference in between two points is the amount of work done is moving a unit charge from one point to another point.
The mass of the electron,
m = 9.109*10⁻³¹
Va (initial speed) = 500,000 m/s
Vb (final speed) = 0 m/s
Electron has been stopped because the electrons move from higher potential to lower potential.
by the work energy theorem
W = ½ mv² (1 equation)
The Potential difference is
W = eV
V = W/e
put the value of W form equation 1.
[tex]V = \frac{\frac{1}{2} (V_{b} ^{2} - V_{a} ^{2} )}{e}[/tex]
e = 9.109*10⁻³¹
V = 1/2 [(500000m/s²) - 0m/s² ] / 9.109*10⁻³¹
V = 1.422v
The potential difference that stopped electron is 1.422v
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A 18000 Hz wave has wavelength of 0.03 meters. How fast is this wave
traveling?
Answer:
540m/s
Explanation:
Given parameters:
Frequency of the wave = 18000Hz
Wavelength of the wave = 0.03m
Unknown:
How fast is the wave traveling = ?
Solution:
How fast the wave is traveling is a measure of the speed of the wave;
Speed of wave = frequency x wavelength
Now insert the given parameters and solve;
Speed of wave = 18000 x 0.03 = 540m/s
question 2(multiple choice worth 5 points) (01.07 mc) distances in space are measured in light-years. the distance from earth to a star is 6.8 × 1013 kilometers. what is the distance, in light-years, from earth to the star (1 light-year
The distance in light years from earth to Star is 7.1 Light Years.
We have the distance from earth to a star is 6.8 × 10¹³ kilometers.
We have to convert it into light years.
What is a Light Year?Light year is a unit of astronomical distance equivalent to the distance that light travels in one year.
1 Light year = 9.4607 × 10¹³ km
According to the question, we have -
Distance from Earth to Star = 6.8 × 10¹³ km.
Now -
1 Light year = 9.4607 × 10¹² km
or
9.4607 × 10¹²km = 1 Light years
1 km = [tex]$\frac{1}{9.4607\times 10^{12} }[/tex] Light years
Therefore -
6.8 × [tex]10^{13}[/tex] km = [tex]$\frac{6.8\times 10^{13} }{9.4607\times 10^{12} }[/tex] = 0.71 x 10 = 7. 1 Light Years.
Therefore, the distance in light years from earth to Star is 7.1 Light Years.
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Question 14 (3 points)
What part of volcano carries magma from the magma chamber to the vent? (3 points)
Vent
Magma Chamber
Lava Flow
Conduit
d
you may check it online
Lars is standing near the edge of a 90-meter cliff. He throws a ball upward, but does not catch it, and it falls to the bottom of the cliff face. From when he threw the ball upward to when it hit the ground below, 5.55 seconds passed. What was the initial vertical velocity of Lars' throw?
a. -43 m/s
b. -11 m/s
c. 43 m/s
d. 11 m/s
Answer:
c. 43 m/s
Explanation:
Given the following data;
Displacement, S = 90 meters
Time, t = 5.55 seconds
To find the initial velocity;
We would use the second equation of motion given by the formula;
[tex] S = ut + \frac {1}{2}at^{2}[/tex]
Where;
S represents the displacement or height measured in meters. u represents the initial velocity measured in meters per seconds. t represents the time measured in seconds. a represents acceleration measured in meters per seconds square.We know that acceleration due to gravity is -9.8m/s² because the direction is downward.
Substituting into the equation, we have;
[tex] 90 = u*5.55 + \frac {1}{2}*(-9.8)*5.55^{2}[/tex]
[tex] 90 = u5.55 - 4.9*30.8025[/tex]
[tex] 90 = u5.55 - 150.93225[/tex]
Rearranging the equation, we have;
[tex] u5.55 = 90 + 150.93225[/tex]
[tex] u5.55 = 240.93225[/tex]
[tex] u = \frac {240.93225}{5.55}[/tex]
Initial velocity, u = 43.41 ≈ 41 m/s
One long wire carries current 30.0 A to the left along the x axis. A second long wire carries current 50.0 A to the right along the line (y = 0.280m, z = 0). (b) A particle with a charge of -2.00μC is moving with a velocity of 150i Mm/s along the line (y = 0.100m , z=0 ). Calculate the vector magnetic force acting on the particle.
The vector magnetic force on the particle is [tex]3.47 \times 10^{-2}{~}\hat{j}{~} N[/tex].
A stream of charged particles, such as electrons or ions, traveling through an electrical conductor or a vacuum is known as an electric current.
One long wire carries a current I = 30.0 A to the left along the x-axis. I' = 50.0 A of current is being carried by a second lengthy wire to the right along the line (y = 0.280 m, z = 0).
Now,
The charge of a particle is -2.00μC which is moving with a velocity of v = [tex]150\hat{i} {~}Mm/s[/tex].
At y = 0.1 m the total magnetic field will be:
B = [ μ₀ (I') / 2πr ] + [μ₀ (I) / 2πr]
[tex]B = [\frac{\mu_{0} }{2 \pi}] \times( \frac{50}{0.28-0.1} (-\hat{k})] + \frac{30}{0.1}(-\hat{k})[/tex]
B = 1.16 × 10⁻⁴ T
Then the force on the particle is:
F =q(v × B)
[tex]F = (-2 \times 10^{-6} ) ( 150 \times 10^{6})\hat{i} \times (1.16 \times 10^{-4})(-\hat{k})[/tex]
F = 3.47 × 10⁻² N
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A toy car accelerates at 3 m/s2 for 2 seconds. Its final velocity is 15 m/s, What is its initial velocity?
Answer:
can i have the toy car after your done asking questions with it
Explanation:
A ball is falling at terminal velocity. Terminal velocity occurs when the ball is in equilibrium and the forces are balanced.
Which free body diagram shows the ball falling at terminal velocity?
The free body that shows the ball falling at terminal velocity is B. A free body diagram with 2 forces: the first pointing downward labeled F Subscript g Baseline 20 N and the second pointing upward labeled F Subscript air Baseline 20 N.
How to illustrate the information?It should be noted that at terminal velocity, the ball will stop accelerating and the net force on the ball will be zero.
In this case, for the net force to be zero, equal, their resultant force is zero. That is F₁ + F₂ = 0 ⇒ F₁ = -F₂
Since F₁ = 20 N, then F₂ = -F₁ = -20 N
Therefore, if F₁ points upwards since it is positive, then F₂ points downwards since it is negative.
Therefore, the correct option is B.
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A ball is falling at terminal velocity. Terminal velocity occurs when the ball is in equilibrium and the forces are balanced. Which free body diagram shows the ball falling at terminal velocity? A free body diagram with one force pointing downward labeled F Subscript g Baseline 20 N. A free body diagram with 2 forces: the first pointing downward labeled F Subscript g Baseline 20 N and the second pointing upward labeled F Subscript air Baseline 20 N. A free body diagram with 2 forces. The first pointing downward labeled F Subscript g Baseline 20 N and the second pointing upward labeled F Subscript air Baseline 5 N. A free body diagram with 2 forces: the first pointing downward labeled F Subscript g Baseline 20 N and the second pointing upward labeled F Subscript air Baseline 30 N.
21.
Figure 1 shows a person sliding down a zip wire.
Figure 1
Zip wire
Change
in vertical
height
(a) As the person slides down the zip wire, the change in the gravitational potential energy
of the person is 1.47 kJ
Eg=m
The mass of the person is 60 kg
gravitational field strength = 9.8 N/kg
Calculate the change in vertical height of the person.
Answer:
Seems like you desperately need answers
The potential energy change is 1.47 KJ or 1470 J. The weight of the person is given 60 kg. Thus vertical height of the person is 2.5 m.
What is potential energy?Potential energy is a form of energy, generated by virtue of the position of an object in the gravitational field. Potential energy depends on the mass, acceleration and height from the ground at which the object is placed/
Thus, P = Mgh. Where m is mass, h is height and g be the acceleration due to gravity, which is equal to 9.8 m/s². It is given that the mass of the person is 60 kg.
The potential energy in the gravitational field is 1.47 KJ or 1470 J, now the height h of the person can be calculated as follows:
h = p/mg.
= 1470 J/ (60 Kg × 9.8 m/s²)
= 2.5 m
Therefore, the vertical height of the hanging person is 2.5 m.
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Compare and contrast types of radioactive decay involving alpha particles, beta particles, and gamma radiation.
In alpha decay, the nucleus loses two protons, in beta decay, the nucleus either loses or gains a proton whereas in gamma decay, no change in proton number occurs only energy is released.
How do the types of radioactive decay compare?Alpha decay is a type of radioactive decay in which the nucleus of an atom emits an alpha particle which leads to transforming into a new atomic nucleus by losing two protons. During beta decay, the proton in the nucleus is transformed into a neutron and and neutron is transformed into proton while on the other hand, gamma decay is a type of decay in which nucleus changes from a higher energy state to a lower energy state due to the release of electromagnetic radiation.
So we can conclude that In alpha decay, the nucleus loses two protons, in beta decay, the nucleus either loses or gains a proton whereas in gamma decay, no change in proton number occurs only energy is released.
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What do both types of bone marrow do that is found in our long bones.
(answer asappp)
Answer:
There are two types of bone marrow – red bone marrow (myeloid tissue) and yellow bone marrow (fatty tissue). Red bone marrow is involved in production of blood cells, while yellow marrow is important for fat storage. As you age, yellow bone marrow replaces red bone marrow.
Explanation:
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