Answer:
Is the mass number
Explanation:
Every atom is usually identified by using two different numbers:
- Atomic number: generally labelled with Z, corresponds to the number of protons in the nucleus, so Z = p
- Mass number: generally labelled with A, corresponds to the number of protons+neutrons in the nucleus, so A = p + n
To find the number of neutrons in a nucleus, therefore, we can do
n = A - Z
Which country has the highest number of beachfront hotels?
Answer:
kenya
Explanation:
it's one of the best place to go on vacation
they've got lots of beachfront hotels. Greece, Ireland and Italy can also be included.
Rocks that are formed as a result of deposits from weathering and erosion
Sedimentary rocks are formed from sediments and deposits of particles of various types, forms and sizes that are transported by air, wind or water, and then subjected to chemical processes to become rocks.
These types of rocks are usually found in the form of layers or strata in places where sediment accumulates due to the erosion of other materials, for example on the banks of rivers, in valleys, lakes (and any other type of body of water).
Two identical charges, each -8.00 E-5 C, are separated by a distance of 20.0 cm (100 cm = 1 m). What is the force of repulsion? Coulomb's constant is 9.00 E9 N*m2/C2
Remember to identify all data (givens and unknowns), list equations used, show all your work, and include units and the proper number of significant digits to receive full credit.
F = 1440 N. The repulsion force between two identical charges, each -8.00x10⁻⁵C separated by a distance of 20.0 cm is 1440 N.
The easiest way to solve this problem is using Coulomb's Law given by the equation [tex]F=k\frac{|q_{1}*q_{2}|}{r^{2} }[/tex], where k is the constant of proportionality or Coulomb's constant, q₁ and q₂ are the charges magnitude, and r is the distance between them.
We have to identical charges of -8.00x10⁻⁵C, are separated by a distance of 20.0 cm, and we need to know the force of repulsion between the charges.
First, we have to convert 20.0 cm to meters.
(20.0 cm x 1m)/100cm = 0.20 m
Using the Coulomb's Law equation:
[tex]F = 9.00x10^{9}\frac{Nm^{2}}{C^{2}} \frac{|-8.00x10^{-5}C*-8.00x10^{-5}C|}{(0.20m)^{2} }[/tex]
[tex]F = 9.00x10^{9}\frac{Nm^{2}}{C^{2}}(1.6x10^-7\frac{C^{2} }{m^{2} } })\\F = 1440N[/tex]
A body is a particular amount of matter. It can be a solid, liquid or gas. It can be described as existing in A. location and movement. B. size and shape. C. time and space. D. motion and force.
Answer:
c.it can be described as existing in time and space
The body is composed of a particular amount of matter which exist in either state of matter. The matter exist in the time and space in regard to the state of matter forming the body.
Answer: Option C
Explanation:
There are 3 states of matter which are namely, solid, liquid and gas. Anybody can only exist in either of these state in the specified time and space. That is, it can either be a solid body such as ice, or a liquid body such as water or a gaseous body such as vapors.
Which of the following is most likely to be a warning that an advertisement
relies on pseudoscience, not science?
O
A. Testimony is provided from scientists who are experts in the field.
O
B. Paid actors are used in the ad instead of actual customers.
O
C. Unbiased experimental data are presented to support their claims.
D. A link is given to the results that were published in a peer-reviewed
journal.
Answer:
Explanation:
You would accept both A and D as being true. Both groups might be paid a small stipend for giving their testimonials but the amount would be to cover their time and travelling. They may not even be offered that.
You'd also accept C. Numbers, unless they are manipulated, generally don't lie.
B is the answer, but how would you know? How could you tell you were dealing with paid actors. However B is the answer.
Answer: paid actors are used in the ad instead of actual customers
Explanation:
APE X
remote controls rely on ____waves to carry signals and transmit information over short distances.
Answer:
Infrared Waves
Someone please help me
Answer:
A: any mirror.
hope it's help you
For an object at rest, the normal force equals the gravitational force. What is the sum of these forces called?
[ ] Net force
[ ] Unbalanced force
[ ] Inertia
[ ] Potential force
Answer:
Sum of these forces is called net force.
Explanation:
When an object is at rest, the forces acting on it are normal force and gravitational force. The normal force act in upward direction while the gravitational force acts in downward direction.
In this case, for an object at rest, the normal force equals the gravitational force. The sum of these forces is called net force. The overall forces acting on the object in any direction is called net force.
Hence, the correct option is (a) '' net force''.
The thermal transfer of energy by electromagnetic waves through the vacuum of space is called
Answer: Radiation
Explanation:
There are three ways in which the thermal transfer occurs:
1. By Conduction, when the transmission is by the direct contact.
2. By Convection, heat transfer in fluids (like water or the air, for example).
3. By Radiation, by the electromagnetic waves (they can travel through any medium and in vacumm)
So, in the outter space is vacuum, this means the energy cannot be transmitted by convection, nor conduction. It must be transmitted by electromagnetic waves that are able to travel with or without a medium, and this is called radiation.
Answer:
Radiation
Explanation:
A wave travels at a constant speed. How does the wavelength change if the frequency is reduced by a factor of 3 ?
A.The wavelength increases by a factor of 3.
B.The wavelength decreases by a factor of 3.
C.The wavelength increases by a factor of 9.
D.The wavelength does not change.
Answer: A. The wavelength increases by a factor of 3.
Explanation:
A diver leaves the end of a 4.0 m high diving board and strikes the water 1.3s later, 3.0m beyond the end of the board. Considering the diver as a particle, determine: the magnitude of her initial velocity.
Answer:
4.0 m/s
Explanation:
The motion of the diver is the motion of a projectile: so we need to find the horizontal and the vertical component of the initial velocity.
Let's consider the horizontal motion first. This motion occurs with constant speed, so the distance covered in a time t is
[tex]d=v_x t[/tex]
where here we have
d = 3.0 m is the horizontal distance covered
vx is the horizontal velocity
t = 1.3 s is the duration of the fall
Solving for vx,
[tex]v_x = \frac{d}{t}=\frac{3.0 m}{1.3 s}=2.3 m/s[/tex]
Now let's consider the vertical motion: this is an accelerated motion with constant acceleration g=9.8 m/s^2 towards the ground. The vertical position at time t is given by
[tex]y(t) = h + v_y t - \frac{1}{2}gt^2[/tex]
where
h = 4.0 m is the initial height
vy is the initial vertical velocity
We know that at t = 1.3 s, the vertical position is zero: y = 0. Substituting these numbers, we can find vy
[tex]0=h+v_y t - \frac{1}{2}gt^2\\v_y = \frac{0.5gt^2-h}{t}=\frac{0.5(9.8 m/s^2)(1.3 s)^2-4.0 m}{1.3 s}=3.3 m/s[/tex]
So now we can find the magnitude of the initial velocity:
[tex]v=\sqrt{v_x^2+v_y^2}=\sqrt{(2.3 m/s)^2+(3.3 m/s)^2}=4.0 m/s[/tex]
nanotechnology is unique, because it is (blank) enough to show quantum mechanical features but still large enough to be controlled and manipulated.
Explanation:
Nanotechnology is the technology that is responsible for the manipulation of matter on a nanometric scale ([tex]1nm=1(10)^{-9}m[/tex]). In addition, it works with the design at the atomic or molecular level.
This technology is based on nanoscience that is responsible for modifying or adulterating matter as it exists, but unlike common sciences, it does so at a molecular level, that is, on a very small scale. Thanks to this, it is possible to manufacture materials and machines from the rearrangement of atoms and molecules with various purposes, mainly industrial and medical.
Therefore:
Nanotechnology is unique, because it is small enough to show quantum mechanical features but still large enough to be controlled and manipulated.
Answer:
Answer is Small
Explanation:
The discovery that the universe appears to be expanding led to a widely accepted theory called ____?
A.) The Big Bang Theory
B.) The Doppler Effect
C.) Hubble’s Law
D.) Solar Nebular Theory
E.) The Seyfert Theory
Answer:c hubble's law
Explanation:
A damaged 1200-kg car is being towed by a truck. Neglecting the friction, air drag, and rolling resistance, determine the extra power required (a) for constant velocity on a level road, (b) for constant velocity of 50 km/h on a 30° (from horizontal) uphill road, and (c) to accelerate on a level road from stop to 90 km/h in 12 s.
(a) 0 W
In this situation, the car is moving on a level road at constant velocity. This means that its acceleration is zero:
a = 0
But this also means that the net force acting on the car is zero, according to Newton's second law:
F = ma = 0
The power required to move the car is
P = Fv
where F is the force applied to the car and v the velocity. Since there are no air drag/frictional forces, the force applied to the car is exactly zero: so, the extra power needed to keep the car in motion at constant velocity is also zero.
(b) 81815 W
In this situation, the car is moving on an uphill road, so there is a component of the weight parallel to the incline acting agains the direction of motion of the car. This component of the weight is given by
[tex]W=mg sin \theta[/tex]
where
m = 1200 kg is the mass of the car
g = 9.81 m/s^2 is the acceleration of gravity
[tex]\theta = 30^{\circ} [/tex] is the angle of the incline
Substituting,
[tex]W=(1200 kg)(9.81 m/s^2)(sin 30^{\circ} )=5886 N[/tex]
So the truck must exerts an additional force of F = 5886 N to keep the car in motion at constant velocity.
The velocity of the car is
v = 50 km/h = 13.9 m/s
So the extra power needed is
P = Fv = (5886 N)(13.9 m/s) = 81,815 W
(c) 31250 W
Here the car accelerates to a final velocity of
v = 90 km/h = 25 m/s
from an initial velocity of
u = 0
So the work done on the car is equal to its change in kinetic energy, so:
[tex]W=K_f - K_i = \frac{1}{2}mv^2 - \frac{1}{2}mu^2 = \frac{1}{2}(1200 kg)(25 m/s)^2 -0 =3.75\cdot 10^5 J[/tex]
The extra power erogated by the truck therefore must be
[tex]P=\frac{W}{t}[/tex]
where
t = 12 s
is the time taken
Substituting,
[tex]P=\frac{3.75\cdot 10^5 J}{12 s}=31250 W[/tex]
An object cannot remain at rest unless which of the following holds?
The net force acting on it is zero.
The net force acting on it is constant.
There are no forces at all acting on it.
There is only one force acting on it.
An object cannot remain at rest unless the net force acting on it is zero. It also can't move with constant, uniform motion (in a straight line at constant speed).
If the net force on it is anything other than zero, then the object must accelerate. (Either its speed, or its direction, or both, must be changing.)
An object can only remain at rest if the net force acting on it is zero, according to Newton's First Law of Motion. This means that any forces present are balanced, resulting in no net change. The law also applies to objects moving at a constant velocity, where they will maintain their state unless a net force is applied.
Explanation:An object cannot remain at rest unless the net force acting on it is zero. According to Newton's First Law of Motion, a body at rest will remain at rest unless acted upon by a net external force. This implies that if there are multiple forces acting on an object, they must be balanced, resulting in a net force of zero. Similarly, when a car is parked, all forces on the car must be balanced out, and the car remains at rest with a zero net force.
It is important to note that an object can also be moving with a constant velocity with a net force of zero. For instance, a car moving down the street at a constant speed is experiencing a zero net force, as the frictional force between the road and tires is balancing out the drag force on the car. The car will continue to move at this constant velocity until an unbalanced force acts on it, causing it to accelerate or decelerate.
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Someone please help me
Answer:
The answer to your question is: D) Ф₂ = 49.71°
Explanation:
Data
n₁ = 1.33
Ф₁ = 35°C
n₂ = 1
Ф₂ = sin⁻¹ (n₁ sinФ₁/n₂)
Process
Substitution
Ф₂ = sin⁻¹ (n₁ sinФ₁/n₂)
Ф₂ = sin⁻¹ (1.33 sin 35/1)
Ф₂ = sin⁻¹ (1.33 x 0.574/ 1)
Ф₂ = sin⁻¹ ( 0.7628 / 1)
Ф₂ = sin⁻¹ (0.7628)
Ф₂ = 49.71°
The junction rule describes the conservation of which quantity? Note that this rule applies only to circuits that are in a steady state.
"Kirchhoff's Junction Rule" and "Kirchhoff's Current Law" are the same thing.
The rule is that the amount of current flowing IN to any point in a circuit is equal to the amount of current flowing OUT of the same point. EVEN if the point is a complicated 'junction' with a thousand different paths in and out of it !
This whole idea is pretty obvious if you understand the law of Conservation of Electric Charge. Charge can't be created out of nothing, and it can't disappear or be destroyed. So whenever you see charge appear, it had to come from somewhere; and whenever you see charge disappear, it had to go somewhere.
That's exactly what's happening at the 'junction' in an electric circuit. Current into the junction brings charge into it. The charge can't pile up there, and it can't just disappear, so it has to leave the junction in a current that's exactly the same size as the current that brought it there.
Two friends are having a conversation. Anna says a satellite in orbit is in freefall because the satellite keeps falling toward Earth. Tom says a satellite in orbit is not in freefall because the acceleration due to gravity is not 9.80 m/2 . Who do you agree with and why?
Answer:
free fall is any motion of a body where its weight is the only force acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it and it moves along a geodesic.As the only force acting on the orbiter is the force of gravity from the Earth, it is in free fall. Note the definition does not specify that the free fall must be directly at the source of gravity, only that the force (weight) is the only force. Anna is right but not because the satellite keeps falling toward the Earth. It's because the gravity force is the only force acting on the satellite. I must add: gravity force is the only applied force, there is also centrifugal force. But that's a reaction force, not an applied force.
If the period of a simple pendulum is T and we increase its length so that it is four times longer, what will the new period be? T/4 It is unchanged. T/2 2T 4T
Answer:
2T
Explanation:
The period of a simple pendulum is:
T = 2π √(L/g)
If L is increased by a factor of 4, then:
2π √(4L/g)
4π √(L/g)
2T
So the period is doubled.
The new period will be 2T
[tex]\texttt{ }[/tex]
Further explanationSimple Harmonic Motion is a motion where the magnitude of acceleration is directly proportional to the magnitude of the displacement but in the opposite direction.
[tex]\texttt{ }[/tex]
The pulled and then released spring is one of the examples of Simple Harmonic Motion. We can use the following formula to find the period of this spring.
[tex]\boxed{T = 2 \pi\sqrt{\frac{m}{k}}}[/tex]
T = Periode of Spring ( second )
m = Load Mass ( kg )
k = Spring Constant ( N / m )
[tex]\texttt{ }[/tex]
The pendulum which moves back and forth is also an example of Simple Harmonic Motion. We can use the following formula to find the period of this pendulum.
[tex]\boxed{T = 2 \pi\sqrt{\frac{L}{g}}}[/tex]
T = Periode of Pendulum ( second )
L = Length of Pendulum ( kg )
g = Gravitational Acceleration ( m/s² )
Let us now tackle the problem !
[tex]\texttt{ }[/tex]
Given:
initial period of a simple pendulum = T₁ = T
initial length of simple pendulum = L
final length of simple pendulum = 4L
Asked:
final period of a simple pendulum = T₂ = ?
Solution:
[tex]T_1 : T_2 = 2 \pi\sqrt{\frac{L_1}{g}} : 2 \pi\sqrt{\frac{L_2}{g}}[/tex]
[tex]T_1 : T_2 = \sqrt{\frac{L_1}{g}} : \sqrt{\frac{L_2}{g}}[/tex]
[tex]T_1 : T_2 = \sqrt{L_1} : \sqrt{L_2}[/tex]
[tex]T : T_2 = \sqrt{L} : \sqrt{4L}[/tex]
[tex]T : T_2 = 1 : 2[/tex]
[tex]\boxed{T_2 = 2T}[/tex]
[tex]\texttt{ }[/tex]
Learn moreModel for Simple Harmonic Motion : https://brainly.com/question/9221526Force of Simple Harmonic Motion : https://brainly.com/question/3323600Example of Simple Harmonic Motion : https://brainly.com/question/11892568[tex]\texttt{ }[/tex]
Answer detailsGrade: High School
Subject: Physics
Chapter: Simple Harmonic Motion
The force required to maintain an object at a constant velocity in free space is equal to
Answer:
The force required to maintain an object at a constant velocity in free space is equal to Zero.
There is no force required to maintain an object at a constant velocity in free space.
Laws of motion:Newton's First Law of motion states that a body under motion will continue to be under motion until there is any external force is applied.In practical conditions, there is a frictional force acting on any moving object, opposite to the motion, which tends to decelerate the object, so to keep the object under motion with a constant velocity a force equal and opposite to the frictional force is needed so that the net force on the object is zero.But in ideal conditions such as free space, there is no opposing force or frictional force, so there is no need of applying any external force to maintain the object at a constant velocity.Learn more about Laws of motion:
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who was theJewish patriarch asked to sacrifice his son
Abraham
Explanation:This story can be found in the bible, in Genesis 22. According to the story, the Lord tested Abraham's faith asking him to sacrifice Isaac his son in a mountain in the land of Moriah. Abraham traveled with his son three days until he found the place the Lord has established for the sacrifice. There, Abraham tied his son and laid him on the altar on top of a wood he had prepared. Abraham picked up a knife to kill his son as a sacrifice but the Lord called him from heaven saying: "Do not hurt him in any way, for now I know that you truly fear God. You have not withheld from me even your son, your only son"
Baby Melanie smiles, giggles, and laughs frequently with both her parents as well as other caregivers; Baby Jerome does not. All else being equal, we can predict from this that
Answer:
We can predict that baby jerome's parents are serious people as well as the other people around him.
Explanation:
The reason behind this is because if a baby isn't laughing or having fun it means that the atmosphere around him or is a serious one
Final answer:
Baby Melanie's engaging behaviors, such as smiling and laughing, are likely to elicit more sensitive and affectionate care from caregivers, which can positively affect her cognitive development. Baby Jerome's lack of such behaviors may lead to less nurturing interaction, which could have implications for his development.
Explanation:
Baby Melanie, who frequently smiles, giggles, and laughs with her parents and other caregivers, demonstrates behaviors that are often positively reinforced by her caregivers, making them more likely to provide sensitive and affectionate care. Conversely, if Baby Jerome does not display these engaging behaviors, he may receive less of this type of interaction.
This variability in caregiver responsiveness could influence the cognitive development of the infants, as studies suggest that infants who are perceived as easygoing and attractive often receive more nurturing care, which is beneficial for their cognitive and social development.
In the 'Strange Situation' experiment, where a mother puts the baby down and leaves the room, the baby's reaction to the stranger and the reunion with the mother can also provide insights into their attachment style, which is influenced by the parental care they receive. These early interactions and the quality of care can predict later emotional and relational outcomes for the child.
If you push twice as hard against a stationary brick wall, the amount of work you do ______________________.
Answer:
It remains zero
Explanation:
The work done on an object is given by:
[tex]W=Fd cos \theta[/tex]
where
F is the magnitude of the force applied
d is the displacement of the object
[tex]\theta[/tex] is the angle between the direction of the force and of the displacement
In this problem, the object is the wall, which is stationary. Therefore, the displacement of the wall is zero:
d = 0
And so, the work done is always zero, even if the force applied is twice as stronger.
Millikan measured the electron's charge by observing tiny charged oil drops in an electric field. Each drop had a charge imbalance of only a few electrons. The strength of the electric field was adjusted so that the electric and gravitational forces on a drop would balance and the drop would be suspended in air. In this way the charge on the drop could be calculated. The charge was always found to be a small multiple of 1.60 × 10-19 C. Find the charge on an oil drop weighing 1.00 × 10-14 N and suspended in a downward field of magnitude 2.08 × 104 N/C.
Answer:
[tex]4.8\cdot 10^{-19} C[/tex]
Explanation:
For a drop in equilibrium, the weight is equal to the electric force (in magnitude):
[tex]W = F_e[/tex]
where here we have
[tex]W=1.00\cdot 10^{-14}N[/tex] is the weight of the drop
[tex]F_e[/tex] is the magnitude of the electric force, which can be rewritten as
[tex]F_e = qE[/tex]
where
q is the charge of the oil drop
[tex]E=2.08 \cdot 10^4 N/C[/tex] is the magnitude of the electric field
Substituting into the equation and solving for q, we find the charge of the oil drop:
[tex]q=\frac{W}{F_e}=\frac{1.00\cdot 10^{-14}N}{2.08\cdot 10^4 N/C}=4.8\cdot 10^{-19} C[/tex]
The charge on an oil drop in equilibrium under an electric field can be found by setting the electric force equal to the gravitational force. For a drop with a weight of 1.00 × 10-14 N in an electric field of 2.08 × 104 N/C, the charge is approximately 4.81 × 10-19 C, indicating the presence of three excess electrons.
The charge on an oil drop weighing 1.00 × 10-14 N and suspended in a downward field of magnitude 2.08 × 104 N/C can be found by balancing the gravitational and electric forces. Since these two forces are in equilibrium, the electric force (F_e = qE) must equal the gravitational force (F_g = mg), where q is the charge on the oil drop, E is the electric field strength, m is the mass of the oil drop, and g is the acceleration due to gravity.
Given that the oil drop is in equilibrium:
F_e = F_g
qE = mg
Solving for q:
q = mg / E
Since the weight (mg) of the oil drop is given as 1.00 × 10-14 N and the electric field strength E is 2.08 × 104 N/C, the charge q can be calculated:
q = (1.00 × 10-14 N) / (2.08 × 104 N/C)
q = 4.81 × 10-19 C
The calculated charge will be a small multiple of the electron's charge, which is approximately -1.6 × 10-19 C. In this case, the result suggests that the oil drop has three excess electrons (3 × -1.6 × 10-19 C ≈ -4.8 × 10-19 C).
No two electrons can have the same four quantum numbers is known as the
Answer:
Pauli's exclusion principleExplanation:
You can read this principle in any chemistry or physics textbook that deals with quantum numbers. It states that two electrons of an atom cannot have the same set of four quantum numbers.
As result:
Any orbital can have a maximum of two electrons, andTwo electrons in a same orbital have opposite spins: one will have +1/2 and the other will have -1/2.Remember, that the quantum numbers are the numbers that identify the electrons in an atom.
n is the principal quantum number, and can have positive integer vaules: 1, 2, 3, 4, 5, 6, 7, ...ℓ is the Azimuthal or angular momentum quantum number. It can have integer values from 0 to n -1: 0, 1, 2, 3, 4, ...mℓ is the magnetic quantum number, which can have values from -ℓ to + ℓms is the spin quantum number. which can have values +1/2 and -1/2.In this way, Pauli's exclusion principle implies that two electrons occupying the same orbital will have equal n, ℓ, and mℓ values, meaning that their ms will be opposite: + 1/2 and −1/2.
The rule that no two electrons can possess the same four quantum numbers is known as the Pauli Exclusion Principle. Proposed by Wolfgang Pauli, this rule dictates that no two electrons can be in the same state within an atom. It limits the number of electrons in atomic shells and subshells, influencing the structure of atoms.
Explanation:The rule that no two electrons can have the same four quantum numbers is known as the Pauli Exclusion Principle. These quantum numbers include: principal quantum number (n), orbital angular quantum number (l), magnetic quantum number (m), and spin quantum number (ms).
An Austrian physicist, Wolfgang Pauli, proposed this rule in 1925. This principle means that two electrons can share the same orbital if only their spin quantum numbers have different values. Since the spin quantum number can only take two values: +½ or -½, a maximum of only two electrons can occupy the same orbital. As a result, any atomic orbital can be populated by zero, one, or two electrons only.
This principle is important because it limits the number of electrons in atomic shells and subshells, and thus plays a crucial role in determining the structure of atoms and the characteristics of the elements on the periodic table.
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Which of these is not a form of electromagnetic radiation?
A) light from your camp fire
B) ultraviolet causing a suntan
C) DC current from your car battery
D) radio signals
E) X-rays in the doctor's office
Answer:
C) DC current from your car battery
Explanation:
Electromagnetic waves are waves consisting of oscillations of electric and magnetic fields perpendicular to each other.
Depending on their wavelength, electromagnetic waves are classified into 7 different types, known as electromagnetic spectrum. These types, from shortest to longest wavelength, are
Gamma rays
X- rays
Ultraviolet
Visible light
Infrared radiation
Microwaves
Radio waves
So, we see that all the following choices
A) light from your camp fire (visible light)
B) ultraviolet causing a suntan
D) radio signals (radio waves)
E) X-rays in the doctor's office
Are forms of electromagnetic radiation, while
C) DC current from your car battery
is not a form of electromagnetic radiation, since DC current consists of a flow of electrons.
Waves are vibration that is transmitted through a medium
The correct option which is not a form of electromagnetic radiation is option C)
C) DC current from your car battery
The reason why option C is correct is presented as follows:
Electromagnetic radiation are a type of waves that is made up of flow of energy in the form in packets propagating as both electric and magnetic waves that can travel though vacuum (empty space) or through a medium, including radiation and waves such as gamma radiation, visible light and radio waves;
The given options A) light from your camp fire B) Ultraviolet causing suntan, D) Radio signals, and E) X-rays in the doctor's office are electromagnetic waves given that they can propagate through empty space as observed in astronomy
The option C) DC current from your car battery, is not an electromagnetic wave because, it requires a medium, the electric cable to be transmitted, and the current moves in only one direction, making it not an electromagnetic wave
Therefore, the option which is not an electromagnetic wave is option C) DC current from your car battery
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A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C. What is the specific heat capacity of iron?
Answer:
[tex]0.46 J/g^{\circ}C[/tex]
Explanation:
The heat absorbed by the piece of iron is given by:
[tex]Q=m C_s \Delta T[/tex]
where here we have
Q = 1086.75 J is the heat absorbed
m = 15.75 g is the mass of the piece of iron
Cs is the iron's specific heat
[tex]\Delta T=175^{\circ}C-25^{\circ} C=150^{\circ}C[/tex] is the change in temperature of the piece of iron
If we re-arrange the formula and we solve for Cs, we find the iron's specific heat capacity:
[tex]C_s=\frac{Q}{m \Delta T}=\frac{1086.75 J}{(15.75 g)(150^{\circ}C)}=0.46 J/gC[/tex]
The specific heat capacity of iron is 0.484 J/g °C.
Explanation:The specific heat capacity of iron can be calculated using the formula:
Specific heat capacity = (heat energy absorbed) / (mass x change in temperature)
Substituting the given values into the formula:
Specific heat capacity = 1086.75 joules / (15.75 g x (175°C - 25°C))
Specific heat capacity = 1086.75 joules / (15.75 g x 150°C)
Specific heat capacity = 0.484 J/g °C
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Atoms with the same number of protons but with different electrical charges _____.
Answer:
Atoms with the same number of protons but with different electrical charges are different ions
Explanation:
Ions are defined as those atoms or molecules which carry charge
Answer:
Atoms with the same number of protons but with different electrical charges are different ions.
A 500-watt vacuum cleaner is plugged into a 120-volt outlet and used for 30 minutes. How much current runs through the vacuum? 900,000 amps 60,000 amps 4.2 amps 0.24 amps
Answer:
4.2amps
Explanation:
Answer:
The current is 4.2 amp.
(c) is correct option.
Explanation:
Given that,
Power = 500 watt
Voltage = 120 Volt
Time = 30 sec
We need to calculate the current
Using formula of current
[tex]P =I\times V[/tex]
[tex]I = \dfrac{P}{V}[/tex]
Where, I = current
P = power
V = voltage
Put the value into the formula
[tex]I=\dfrac{500}{120}[/tex]
[tex]I=4.2\ amp[/tex]
Hence, The current is 4.2 amp.
How are changes in energy and matter related
Answer:
According to Einstein's famous equation, matter can convert into energy (and viceversa) as follows:
[tex]E=mc^2[/tex]
where
E is the energy
m is the mass
c is the speed of light ([tex]3\cdot 10^8 m/s[/tex])
Given the huge value of [tex]c^2[/tex], we see that even a tiny amount of matter is able to release a huge amount of energy, when the whole mass is converted into energy. This is precisely what happens in nuclear reactions. For example, in the process of nuclear fusion (that occurs in the core of the stars), two light nuclei fuse together into a heavier nucleus. The mass of the final nucleus is lower than the total mass of the initial nuclei, so part of the mass has been converted into energy according to the equation above: this is why the amount of energy produced by stars is so big.