The energy emitted by a photon when it falls from level f to energy level b is 2.84 eV.
Energy of photon at level f and level b
The energy of a photon at level F is given as -268 eV and the energy photon at level b is given as -5.52 eV.
Energy emitted by a photon when it falls from level f to energy level b is calculated as follows;
ΔE = -2.68 eV - (-5.52 eV)
ΔE = -2.68 eV + 5.52 eV
ΔE = 2.84 eV
Thus, the energy emitted by a photon when it falls from level f to energy level b is 2.84 eV.
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the importance of organs of nervous system
Explanation:
The nervous system transmits signals between the brain and the rest of the body, including internal organs. In this way, the nervous system's activity controls the ability to move, breathe, see, think, and more.
How does the weight of an object relate to how fast it falls with a parachute?
Consider an object of mass 2kg on a ramp with βs=0.5 and βk=0.4.
If we keep increasing the ramp angle, what is the angle() that the object starts to move downward? Give your answer in degree with 1 decimal place.
If we keep increasing the ramp angle, the angle that the object starts to move downward is 26.6°
To find the ramp angle, we need to know the forces acting on the mass on the ramp.
Forces acting on the mass on the ramp.Since the mass will just start to move, the force acting on the mass in the horizontal direction is the horizontal component of its weight in that direct. So, F = mgsinθ. where θ = ramp angle
The force acting on the mass in the vertical direction is the vertical component of its weight, F' = mgcosθ where θ = ramp angle
For the mass to just start to move downwards, the horizontal component of its weight must equal the static frictional force, f on it.
F = f
Since f = μN where
μ = coefficient of static friction = 0.5 and N = normal force = F' = mgcosθSo, F = f
mgsinθ = μmgcosθ
Dividing through by mgcosθ, we have
mgsinθ/mgcosθ = μmgcosθ/mgcosθ
sinθ/cosθ = μ
μ = tanθ
The ramp angle at which the object starts to move downwardSo, the angle at which the object starts to move downward is
θ = tan⁻¹μ
Since μ = 0.5
θ = tan⁻¹0.5
θ = 26.57°
θ ≅ 26.6°
So, the angle at which the object starts to move downward is 26.6°.
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A train moving west with an initial velocity of 20 m/s accelerates at 4 m/s' for 10 secon
moves a distance of
a
meters.
Answer:
Distance of 400m.
Explanation:
Use your kinematics equation to solve for distance (we can use kinematics b/c acceleration is constant).
d = (initial velocity x time) + 1/2 at^2
d = (20 x 10) + 1/2 (4) (10)^2
d = 200 + 200
d = 400 m
How does the force of gravity relate to size?
Answer:
Gravitational force is an attraction between masses. The greater the size of the masses, the greater the size of the gravitational force (also called the gravity force). The gravitational force weakens rapidly with increasing distance between masses
A sphere of mass 15 kg possess kinetic energy of 1200 J. Calculate its
velocity
Answer:
12.65 Meters / Second (m/s)
Explanation:
the problem is really easy to solve, we begin by stating the kinetic energy formula which is:
KE = (1/2)(mass)(velocity)^2
We equate 1200 J to the formula, substitute the mass, and solve for velocity either using a CAS, app, or by hand
1200J = (0.5)(15kg)v^2
v = 12.65 m/s
A battery of emf 20v and internal resistance 1 ohms connected in series with an external resistor4 ohms what is
a power dissipate due to ineternal resistor
The power dissipate due to internal resistor is 400 W.
Power dissipated in a circuit
The power dissipate due to internal resistor is calculated as follows;
P = IV
P = (V/r)V
P = V²/r
where;
V is emf of the batteryr is internal resistorP = (20²)/(1)
P = 400 W
Thus, the power dissipate due to internal resistor is 400 W.
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how does x-rays tube work
A)Compton effect
b)Photoelectric phenomenon
c) cathod and anode
Answer:
c
Explanation:
X-ray tube is an evacuated electron tube that creates X rays by accelerating electrons to a high velocity and causing them to collide with a target, the anode plate, using a high-voltage field.
If a sound wave has a wavelength of 7 m and travels at a speed of 330 m/s, what is the
frequency of the sound?
O 47.1 hz
O2.12 hz
2.31 hz
23.1 hz
Answer:
047.1
Explanation:
frequency equals velocity over lambda
86. What is the average velocity if the initial velocity is at rest and the final velocity of 16 m/s? a) 16 m/s b) 12 m/s c) 8 m/s d) 4 m/s
Answer:
8 m/s
Explanation:
(16-0)/2 = 8 m/s
What does the term conservation mean?
A. The process of changing used materials into new products
B. The process of removing pollution from a natural resource
C. Consistent overuse of renewable resources
D. The protection and careful use of natural resources
==============================
[tex] \large \sf \underline{Question:}[/tex]
What does the term conservation mean?==============================
[tex] \large \sf \underline{Answer:}[/tex]
[tex] \qquad \qquad \huge \bold{Option \: D}[/tex]
==============================
[tex] \large \sf \underline{Explanation:}[/tex]
From the term or word itself "Conservation" or in other words conserve, it directly means the protection and careful use of natural resources.==============================
If an amount of heat Q is needed to increase the temperature of a solid metal sphere of diameter D from 4°C to 7°C, the amount of heat needed to increase the temperature of a solid sphere of diameter 2D of the same metal from 4°C to 7°C is
Answer:
Q = c M ΔT where c is the heat capacity and M the mass present
Q2 / Q1 = M2 / M1 since the other factors are the same
M = ρ V where ρ is the density
M = ρ Π (d / 2)^2 where d is the diameter of the sphere
M2 / M1 = (2 D/2)^2 / (D/2)^2 = 4
It will take 4Q heat to heat the second sphere
Waves
Please need help fast
A small object with a mass of 1 kg moves in a circular path with a constant speed of 5 m/s. What is the change in momentum during 1⁄2 of period; one period?
The change in momentum of the object during the half period is -10 kgm/s.
The change in momentum of the object during the one period is 0.
Change in momentum of the object during ¹/₂ period
The change in momentum of the object during the half period is calculated as follows;
ΔP(¹/₂) = Pf - Pi
where;
Pf is final momentumPi is the initial momentumΔP(¹/₂) = (-5 x ) - (5 x 1)
ΔP(¹/₂) = -10 kgm/s
Change in momentum of the object during 1 periodΔP(1) = Pf - Pi
ΔP(1) = (5 x 1) - (5 x 1) = 0
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A force of 400N acts on a body for time 10ms impulse will be
Answer:
4000Ns
Explanation:
I=F×T=400N×10ms
Name two ways to get more voltage from a generator.
Answer:
1. The faster the coil rotates the faster will it cut the magnetic field and the bigger will be the output voltage.
2. You could increase the output voltage of a generator by rotating it faster, increasing the number of turns on the coil or using stronger magnets,
Explanation:
Hopefully this helps if not im terribly sorry
A
car accelerates from rest at 4.5 m/s² for 3 seconds.
a. What is the car's velocity after 3 seconds?
b. What distance does the car travel in the 3 seconds?
m/s
A car accelerates from rest at 4.5 m/s² for 3 seconds, the car's velocity after 3 seconds is 13. 5 m/s
The distance the car travel in the 3 seconds is 40. 5m/s
The first equation of motion is v = u + a t. It explains the relationship between velocity and time.
V = Final velocity
u = Initial velocity
a = acceleration
t = time.
How to determine the velocity
When an object is brought to rest or moves from resting, U, initially velocity equals 0.
From the formula,
V = u + at
V = ?
u = 0, because the object was at rest.
a = 4. 5 m/ s²
t = 3 seconds
Velocity, V = 0 + 4. 5 × 3
Velocity , V = 0 + 13. 5
Velocity, V = 13.5 m/s²
How to determine the distance
Velocity = Distance ÷ time
Velocity, V = 13. 5 m/s²
time = 3 seconds
distance = ?
Distance = Velocity × time
Distance = 13. 5 × 3
Distance = 40. 5 m
Therefore, the car's velocity after 3 seconds is 13. 5 m/s² and the distance the car travels after 3 seconds is 40. 5m
Monitoring cash flow and keeping track of the bottom line of a business are responsibilities for whom?
A copper wire of length 25 cm is in a magnetic field of 0.20 T. If it has a mass of 10 g, what is the minimum current through the wire that would cause a magnetic force
equal to its weight?
Select one:
1.3 A
1.5 A
2.0 A
4.9 A
Hi there!
Recall the equation for magnetic force on a wire:
[tex]F_B = B \times iL[/tex]
[tex]F_B[/tex] = Magnetic force (N)
B = Magnetic field strength (0.2 T)
i = Current in wire (? A)
L = Length of wire (0.25 m)
This is a cross-product, but we can assume the field is perpendicular to the current since it is not explicitly stated otherwise.
The equation for the weight of an object (Force due to gravity) is given by:
[tex]F_g = mg[/tex]
m = mass of object (0.01 kg)
g = acceleration due to gravity (9.81 m/s²)
Set the two equations equal to each other and solve for 'i'.
[tex]F_B = F_g\\\\BiL = mg\\\\i = \frac{mg}{BL} = \frac{0.01 * 9.81}{0.2 * 0.25} = \boxed{1.962A \approx 2.0 A}[/tex].
-10m/s² and vertical height of 0.6m.How will we use this information to find the velocity of the falling object?
Light ray 1 strikes the surface, separating air and water as shown below.
A horizontal line is drawn and the part above the line is labeled Air and the part below the line is labeled Water. There is one slanting ray labeled 1 which falls on the line at a point and there are four rays of light labeled 2, 3, 4, and 5 which move away from same point on the line. Ray 5 is exactly vertical to the line and below the line, ray 4 is on the right of ray 5 and makes an angle of about 25 degrees with ray 5. Ray 3 is above the line and makes an angle of about 25 degrees with the line. Ray 2 is on the right of ray 1 and ray 1 and ray 2 make angles of about 25 degrees with the vertical at the point where ray 1 strikes.
Which of the following is the refracted ray for ray 1?
Group of answer choices
Ray 2
Ray 3
Ray 4
None, ray 1 is not refracted
The ray that is part of the reflected ray must be ray 2 from the description in the question.
What is reflection?
the term reflection has to do with the bouncing back of a wave. When waves hit a surface, they can bounce back in the opposite direction. The reflection of light leads to so many phenomena such as shadow.
In this case, the ray that is part of the reflected ray must be ray 2 from the description in the question.
So RAY 2
Answer:
The ray that is part of the reflected ray must be ray 2 from the description in the question.
Explanation:
(100 POINTS AND BRAINLIEST)
1. When elements form a molecule, what is true about the oxidation numbers of the atoms in the molecule?
a. The sum of the oxidation numbers must equal zero.
b. All oxidation numbers from the same molecule must be positive.
2. True or False: All oxidation numbers from the same molecule must be negative.
a. True
b. False
3. Which of the following elements will bond with oxygen resulting in a 1:1 ratio of oxygen and the element?
a. lithium
b. boron
c. beryllium
d. nitrogen
Answer:
1. a
2. b (FALSE)
3. c (beryllium)
Explanation:
Answer:
the answer for number one is A. number 2 is B. and number 3 is C.
Explanation:
theys a Quizlet made on these three questions already so I just got it from there. they should be correct pls let me know if they are.
Formulating an Investigative Question
In this lab, you will use a magnet and a simple circuit to
examine the concepts of electricity and magnetism. Think
about how these ideas can be shown experimentally.
In the space below, write a scientific question to address
by doing this experiment.
A magnet can be used to show electromagnetic forces by showing how negative charges can move a particular piece of metal.
What is a scientific question?A scientific question is a given question derived from observation of the real world and can be answered by applying the scientific method.
In this case, a plausible scientific question might be how electromagnetic forces can move a piece of metal and we need to develop an explanation (hypothesis) to understand it.
In conclusion, a magnet can be used to show electromagnetic forces by showing how negative charges can move a metal.
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Answer:
How can magnetic and electric fields be demonstrated?
Explanation:
Why are current and resistance kept very low?
A. To prevent excess heat.
B. Because the voltage is also quite low.
C. Both A. and B.
D. None of the above.
Answer:
I think the answer is B.
Explanation:
If the resistance is too high, the current will be low even if the voltage is enough.7. What is the radius of an \alpha particle?
rxcuobudbbgvd CT I ng a ubjnr. hbgvw
a car uses 2500j in 25 seconds how much power did you use
Answer:
power is 100W
Explanation: power= joule/second
power= 2500/25
=100W
To which group/family does each of these belong? A. Sulfur _________ B. Sodium _________ C. Argon _________ D. Silicon _________ E. Chlorine _________ F. Phosphorus_________
Answer:
A. Sulfur _________ group 16 chalcogens
B. Sodium _________ group 1 alkali metals
C. Argon _________ group 18 noble gases
D. Silicon _________ group 14 carbon family
E. Chlorine _________ group 17 halogens
F. Phosphorus_________ group 15 pnicogens
A piece of polystrene has charge of -4mC(4 millicoulombs) and is placed 3m from a piece of salt with a charge of -3mc. Calculate the amount of electrostatic force which will be produced
From the calculation, we can see that the electrostatic force on the material is 1200 N.
What is electrostatic force?The electrostatic force is described by Coulumb's law. According to the law;
F = Kq1q2/r^2
Where;
q1 = -4 * 10^-3 C
q2 = -3 * 10^-3 C
r = 3 m
K = 9 * 10^9
Hence
F = 9 * 10^9 * -4 * 10^-3 C * -3 * 10^-3 C/(3)^2
F = 1200 N
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examples of cultural lag
Answer:
when you lag in culture
Explanation:
it makes sense
Answer:
Well it could possibly be because of where you live, or if there is a strong power source or WiFi thing.
Explanation:
I’m sorry if my answers not the best I’m just doing it of my own experience from bad WiFi.
Two identical pucks of equal but unknown mass head straight towards each other with velocities
of 8.0 m/s and -6.0 m/s. They collide and stick together. What is their resulting velocity?
inelastic collision
m.8 - m.6 = 2mv'
2m = 2mv'
v' = 1 m/s
Answer:
1 m/s
Explanation:
According to the Law of Conservation of Momentum, (for inelastic collisions)
v = m₁v₁ + m₂v₂ / m₁ + m₂v = 8m - 6m / 2mv = 2m/2mv = 1 m/s