Answer:
so its the first option
Explanation:
Concave lenses create only virtual images. After the rays are refracted, they never converge and so there will be no real images. All concave lens images will be upright, virtual, and diminished, and can be found between the F and the lens
Answer: The correct answer is;
Virtual
Upright
Diminished
Explanation: Hope this answers your question :)
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An electron is released in a uniform electric field with a magnitude of 8000 V/m. The electron is displaced 2 m as a result. Find the potential difference between the electron's initial and final
Complete question:
An electron is released in a uniform electric field with a magnitude of 8000 V/m. The electron is displaced 2 m as a result. Find the potential difference between the electron's initial and final position.
Answer:
the potential difference between the electron's initial and final position is 16,000 V.
Explanation:
Given;
magnitude of the electric field, E = 8,000 V/m
initial position of the electron, x₀ = 0
final position of the electron, x₁ = 2 m
The potential difference between the electron's initial and final position;
V = E(x₁ - x₀)
V = 8000(2 - 0)
V = 16,000 V
Therefore, the potential difference between the electron's initial and final position is 16,000 V.
When an object absorbs light energy, it reflects
A. all of the colors
B. none of the colors
C. only the colors you see
When an object absorbs light energy, it reflects none of the colors. The correct option is B.
What is reflection?The change in direction of a wavefront at an interface between two different media so that the wavefront returns to the medium from which it originated is referred to as reflection. Reflection of light, sound, and water waves are common examples.
Objects appear different colors because they absorb certain colors (wavelengths) while reflecting or transmitting others. The wavelengths that are reflected or transmitted are what we see as colors.
If photon energy is absorbed, the energy from the photon is typically manifested as heating the matter.
Light absorption causes an object to become dark or opaque to the wavelengths or colors of the incoming wave: Wood is impervious to visible light.
Thus, the correct option is B.
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Multi-Choice!
A gold pendulum swings with angular acceleration a, and a point on the edge has tangential acceleration a. A silver pendulum swings with angular acceleration 3a, and a point on the edge has tangential acceleration 5a. How does the radius of the gold pendulum r gold compare with the silver pendulum r silver ?
A 1/15
B 5/3
C 15
D 3/5
Answer:
D 3/5 i took this quiz still waiting on grade tho
A monochromatic beam of light has a frequency of 6.5 x 10" hertz. What color is the light?
O orange
O yellow
O violet
O blue
Answer:
violet
Explanation:
Of all of the structures in a cell, which actually contains the cell's DNA? A. Mitochondria B. Cell membrane C. Nucleus D. Cytoplasm
Answer:
C. Nucleus
Explanation:
The nucleus, formed by a nuclear membrane around a fluid nucleoplasm, is the control center of the cell. Threads of chromatin in the nucleus contain deoxyribonucleic acid (DNA), the genetic material of the cell.
have a good day and here’s a funny comic just for fun! :)
What are successfulness of the Competition policy in South Africa?
Answer:
The product choices along with its competitive prices were provided to the consumers. Practices such as horizontal collusion and resale price maintenance was declared unlawful in 1984. Prevention of monopoly growth was the aim of the competition policy act.
Explanation:
hope this helps you
what is the effects on peoples when there is no hospital in the community
Answer: It is an insidious, self-perpetuating problem that affects generations of families. ... Society can intervene to increase host resistance and mitigate poverty's negative ... prevention, quality, potentially avoidable hospital use, and health outcomes. ... These findings point out that low-income status does not have to determine poor
Explanation:
Which of the following has the same unit as the moment of force?
a.force
b.work
c.power
d.momentum
e.impulse
Answer:
Work
Explanation:
Units are
[tex]kg {m}^{2} {s}^{ - 2} = newtons \times meter[/tex]
How death rate helps in changing population
Ellie cycled from her home to her friend’s house. She stayed at her friend’s house and then travelled home.
a. At what time did Ellie leave home?
b. How far was Ellie from home while visiting her friend?
c. How long did Ellie stay at her friend’s house?
What is the new speed for an 10 kg object after 16500 N was applied to it for 2 seconds?
Answer: 3300 m/s
F = ma; units: N = kg(m/s/s); where F and a are both vectors, while m, t, and v (speed) are scalars
We are given the mass, force, and the time; however, speed is our unknown.
[F = 16500 N] [m = 10 kg] [t = 2 s] [v = unknown]
What we can do is use kinematics in order to relate v and t with F and m:
For example, we can use V = V₀ + at
Since F = ma can equal a = F/m, we can replace the a variable within the kinematics equation with F/m, so that:
V = V₀ + at
V = V₀ + (F/m)t
In this problem, we can assume the initial value V to equal 0, giving us:
V = (F/m)t
Plugging in the quantities we get:
V = [tex]\frac{16500 N}{10kg}[/tex]· 2s
V = 3300 m/s
To further check whether this is the right manipulated equation to use, we can use dimensional anaylsis to determine that:
V = [tex]\frac{kg(m/s/s) }{kg}[/tex]· s
V = m/s
I hope this helped!
A car's engine generates 100,000W of power as it exerts a force of 10,000N . How long does it take the car to travel 100m ?
Answer: 10 s
Explanation:
Given
Engine generates [tex]100,000\ W[/tex] power
Force exerts [tex]F=10,000\ N[/tex]
Distance traveled [tex]d=100\ m[/tex]
work done is given by
[tex]W=F\cdot d\\W=10,000\times 100\\W=10^5\ J[/tex]
Also, Energy is given as
[tex]\Rightarrow E=P\cdot t[/tex]
Insert the values
[tex]\Rightarrow 10^6=100,000\times t\\\\\Rightarrow t=\dfrac{10^6}{10^5}\\\\\Rightarrow t=10\ s[/tex]
Give three examples of the importance of gravity to humans?
An astronaut in space cannot use a conventional means, such as a scale or balance, to determine the mass of an object. But she does have devices to measure distance and time accurately. She knows her own mass is 78.4 kg, but she is unsure of the mass of a large gas canister in the airless rocket. When this canister is approaching her at 3.50 m/s, she pushes against it, which slows it down to 1.20 m/s (but does not reverse it) and gives her a speed of 2.40 m/s. What is the mass of this canister
Answer:
81.81 kg
Explanation:
[tex]m_1[/tex] = Mass of person = 78.4 kg
[tex]m_2[/tex] = Mass of canister
[tex]u_1[/tex] = Initial velocity of person = 0
[tex]u_2[/tex] = Initial velocity of canister = 3.5 m/s
[tex]v_1[/tex] = Final velocity of person = 2.4 m/s
[tex]v_2[/tex] = Final velocity of canister = 1.2 m/s
The momentum balance in the system is given by
[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2\\\Rightarrow 78.4\times 0+m_2\times 3.5=78.4\times 2.4+m_2\times 1.2\\\Rightarrow m_2=\dfrac{78.4\times 2.4}{3.5-1.2}\\\Rightarrow m_2=81.81\ \text{kg}[/tex]
Mass of the canister is 81.81 kg.
A car accelerates at a rate of 13m/s^2[S]. If the car's initial velocity is 120km/h[N]. What will be its final velocity in m/s, after 2 seconds.
Answer:
the final velocity of the car is 59.33 m/s [N]
Explanation:
Given;
acceleration of the car, a = 13 m/s²
initial velocity of the car, u = 120 km/h = 33.33 m/s
duration of the car motion, t = 2 s
The final velocity of the car in the same direction is calculated as follows;
v = u + at
where;
v is the final velocity of the car
v = 33.33 + 13 x 2
v = 59.33 m/s [N]
Therefore, the final velocity of the car is 59.33 m/s [N]
You serve a volleyball with a mass of 0.77 kg. The ball leaves your hand with a velocity of
2.33 m/s. Calculate the joules of kinetic energy of the ball.
[tex] \boxed{ \mathrm{Kinetic \: Energy = \frac{1}{2} m {v}^{2} }}[/tex]
[tex] \dfrac{1}{2} \times 0.77 \times (2.33) {}^{2} [/tex][tex] \dfrac{418.0253}{2} [/tex][tex]209.01265 \: \: joules[/tex][tex] \mathrm{209.01 \: \: joules} \: \: \: (approx)[/tex]_____________________________
[tex]\mathrm{ \#TeeNForeveR}[/tex]
calculate the frequency of a wave using an equation
Answer:
1. f=1T. where: f is the frequency of the wave in hertz. T is the period of the wave in seconds.
2. f=vλ where: f is the frequency of the wave in hertz. v is the velocity of the wave in meters per second. λ is the wavelength of the wave in meters
3. f=cλ
Explanation:
When a wave passes from a less dense medium to a denser one, most of the
wave energy is
A. reflected.
B. diffracted.
C. absorbed.
D. refracted.
Answer:
D. Refracted
Explanation:
At the point when light passes from a less thick to a more thick substance, (for instance passing from air into water), the light is refracted (or bowed) towards the ordinary. The bowing happens on the grounds that light voyages all the more gradually in a denser medium. The answer is D, refracted.
Atoms in Group 18 elements are inert (chemically unreactive) because ___________________________. A they combined to form molecules. B they have no valence electrons. C they have filled inner energy levels. D they have a full valence shell.
When you say full valence shell, are you talking about a valence electron shell?
I am learning about atoms and i know a little bit
Atoms in Group 18 elements are inert (chemically unreactive) because they have no valance electrons. The correct option is B.
What is valency?In chemistry, an element's valence or valency is the measure of its ability to combine with other atoms to form chemical compounds or molecules.
The number of atoms of one element combined with one atom of another element to form a molecule is referred to as its valency.
Valency is also referred to as molecular weight. Valency is a measure of an atom's combining power. The number of electrons in an element's outermost shell determines its valency.
Because of their full valence shells, noble gases are unreactive. They do not easily gain or lose electrons because they are already in the most stable electronic configuration.
Thus, the correct option is B.
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Using the diagram above, the coefficient of kinetic friction for copper is ____ (Your answer should be given to the nearest thousandths.)
This coefficient _____ applies to all similar copper surfaces.
Answer:
μ= 0.0375, kinetic
Explanation:
For this exercise we set a reference system with the x axis parallel to the chord
Y axis
N - W = 0
N = W
X axis
T - fr = 0
the expression for the friction force is
fr = μ N
we substitute
T - μ W = 0
μ = T / W
we calculate
μ = 1.5 / 40
μ= 0.0375
coefficient of kinetic friction
Sobre un gas contenido en un cilindro provisto de un pistón se realiza un trabajo de 7000 Joules, mediante un proceso isotérmico. Determinar: a) La variación de la energía interna del gas. b) El calor absorbido o cedido por el gas. c) Extrae una conclusión del ejercicio.
Answer:
En un proceso isotérmico, es decir, la temperatura no cambia, el trabajo puede escribirse como:
W = n*R*T*Ln(P1/P2)
Donde P1 es la presión inicial y P2 la presión final.
Donde las cantidades:
n = número de moles
R = constante de los gases ideales
T = temperatura no cambian.
Y sabemos que la ecuación de la energía interna es:
U = C*n*R*T
Donde C es otra constante que depende del gas.
De aca, podemos concluir que ninguna de estas variables cambia en nuestro proceso, por lo que la variación de la energía interna es cero.
U2 - U1 = 0
b) Para el calor cedido o absorbido, la formula básica es:
ΔQ = C*(T2 - T1)
Donde ΔQ es el calor absorbido o cedido por el gas, C es una constante que depende del gas, T2 es la temperatura final del gas y T1 es la temperatura inicial del gas.
Como la temperatura no cambia en el proceso, entonces:
T2 = T1
ΔQ = C*(T2 - T1) = C*0 = 0
No hay calor absorbido ni cedido.
c) Podemos concluir que en un proceso isotérmico la energía interna no cambia, y no hay un intercambio de calor.
Can someone help me figure this out please?
Answer:
2/B
6/E
7/F
12/6
Explanation:
Hope this helps i dont know ither i will put if i think of them
A(n) _______ studies physical components and characteristics of celestial objects.
The answer is ASTROPHYSICIST!
Answer:
Astronomers?
Explanation:
Answer:
Astrophysicist?
Explanation:
How does the motion of the atoms in the spoon change when the spoon is placed in the hot coffee?
А
The atoms vibrate faster due to the conduction of heat through atoms in the spoon.
B
The atoms vibrate slower due to the conduction of heat through atoms in the spoon
С
The atoms move closer toward each other due to the radiation of heat through atoms in the spoon.
D
The atoms move away from each other due to the convection of heat through atoms in the spoon.
Answer:
A.The atoms vibrate faster due to the conduction of heat through atoms in the spoon.
Brainliest for correct answer! :)
Answer:
1. 300.15
2. 873.15
3. 221.95
1. -243.15
2. -210.85
3. 295.17
Distance affects the amount of potential energy stored within a system that consists of two bar magnets. A student placed two bar magnets on a table with like poles facing each other.
Which line on Graph 2 accurately shows the relationship between distance and the amount of potential energy stored in this system?
Answer: Line A
Explanation: Distance AFFECTS the amount. Potential Energy DOESN'T AFFECT the distance.
Line B accurately shows the relationship between distance and the amount of potential energy stored in this system.
What is meant by magnetic potential energy ?The amount of work required to rotate a magnetic dipole from its zero potential state to any desired position is known as the potential energy of the magnetic dipole in a magnetic field.
Here,
Maxwell's equations establish a relation between magnetic potential energy and electrostatic potential energy. The mechanical work of the magnetic force (really, magnetic torque) on the re-alignment of the vector of the magnetic dipole moment is what is known as the potential energy of a magnet or magnetic moment m in a magnetic field B.
The magnetic field's direction and distance have an impact on magnetic PE. A magnet's south pole can get close to its opposite pole's north pole. The two magnets are drawn together by this force. Their potential energy increases with increasing distance. It is possible for two north poles to collide.
The fields of the magnets are perfectly opposite one another. They are forced apart by a repelling force created by the field. Each one repels the other. The closer they are in this situation, the greater their potential energy will be.
Hence,
Line B accurately shows the relationship between distance and the amount of potential energy stored in this system.
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The resistivity of a given wire of cross sectional area 0.7mm is 4.9*10-4mm.Calculate the resistance of 2m length of the wire
Answer: [tex]1.4\ \Omega[/tex]
Explanation:
Given
Cross-sectional area [tex]A=0.7\ mm^2[/tex]
Resistivity [tex]\rho =4.94\times 10^{-4}\ \Omega-mm[/tex]
Length of wire [tex]l=2\ m\ or\ 2000\ mm[/tex]
Resistance is given by
[tex]\Rightarrow R=\dfrac{\rho l}{A}\\\\\text{Insert values}\\\\\Rightarrow R=4.9\times 10^{-4}\times \dfrac{2000}{0.7}\\\\\Rightarrow R=1.4\ \Omega[/tex]
A lamp is connected to the power supply.
The lamp requires an input potential difference of 5.0V
The alternator generates a potential difference of 1.5V
The primary coil of the transformer has 150 turns.
Calculate the number of turns needed on the secondary coil
Number of turns on the secondary coil = ?
Answer:
There are 45 turns in the secondary coil.
Explanation:
Given that,
Input potential of the lamp, [tex]V_{in}=5\ V[/tex]
The output potential of the lamp, [tex]V_{out}=1.5\ V[/tex]
Number of turns in primary coil, [tex]N_P=150[/tex]
We need to find the number of turns needed on the secondary coil. We know that the ratio for a transformer is as follows :
[tex]\dfrac{V_{out}}{V_{in}}=\dfrac{N_s}{N_P}\\\\N_s=\dfrac{V_{out}N_P}{V_{in}}\\\\N_s=\dfrac{1.5\times 150}{5}\\\\N_s=45\[/tex]
So, there are 45 turns in the secondary coil.
A baseball is thrown at a 22.5° angle and an initial velocity of 65 m/s. What will be its horizontal
and vertical velocity?*
Answer:
Horizontal
Explanation:
It is going more sideways than upwards