The number of energy levels increases as you move down a group as the number of electrons increases
Explanation:
The determination of distance of separation between the two nuclei of likely atoms connected together called atomic radius. This in a group usually increases from top to bottom. With the increase in the atomic number in the group, the positive nuclear charge increases again. However, the amount of principle energy is also increasing.
High principle energy levels made up of orbits of higher size than low energy levels. The impact of this exceeds the increased nuclear charge, and thus the atomic radius gets increased when going down a group in the periodic tables.
Atomic radius gradually decreases from the side left to the right during the elemental period. This is because all electrons of the same size are added over time or in a family of elements.
Answer:
Literally, the Atomic radius of a chemical element is a term used to describe the size of an atom.
Atomic radius can be regarded as a measure of the size of its atoms. This is often characterized by the mean or typical distance of the chemical element from the center of the nucleus to the boundary of the surrounding shells of electrons.
In general, the size of an atom will decrease as you move from left to the right of a certain period
Periodic Trends of Atomic Radius. An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements.
Consider Compton Scattering with visible light.A photon with wavelength 500nm scatters backward(theta=180degree) from a free electron initially at rest.What is the fractional shift in wavelength delta\lamda/\lamda for the photon?
Answer: [tex]4.86(10)^{-12}m[/tex]
Explanation:
The Compton Shift [tex]\Delta \lambda[/tex] in wavelength when photons are scattered is given by the following equation:
[tex]\Delta \lambda=\lambda' - \lambda_{o}=\lambda_{c}(1-cos\theta)[/tex] (1)
Where:
[tex]\lambda'=500 nm=500(10)^{-9} m[/tex] is the wavelength of the scattered photon
[tex]\lambda_{o}[/tex] is the wavelength of the incident photon
[tex]\lambda_{c}=2.43(10)^{-12} m[/tex] is a constant whose value is given by [tex]\frac{h}{m_{e}.c}[/tex], being [tex]h=4.136(10)^{-15}eV.s[/tex] the Planck constant, [tex]m_{e}[/tex] the mass of the electron and [tex]c=3(10)^{8}m/s[/tex] the speed of light in vacuum.
[tex]\theta=180\°[/tex] the angle between incident phhoton and the scatered photon.
[tex]\Delta \lambda=2.43(10)^{-12} m (1-cos(180\°))[/tex] (2)
[tex]\Delta \lambda=4.86(10)^{-12}m[/tex] (3) This is the shift in wavelength
Which statement best describes the magnetic properties of a material?
Magnetic materials have many spinning, unpaired electrons
Paired electrons of magnetic materials can move to other atoms
Electrons of magnetic materials are strongly held by atomic nuclei
Magnetic materials move positively charged particles to other atoms
Answer:
Magnetic materials have many spinning, unpaired electrons.
Explanation:
Any moving electric charge creates a magnetic field, also electrons since they spin and move around the nucleus. However, if two electrons are paired on the same orbital they always spin in opposite directions that causes their magnetic field to cancel out. Even if there are unpaired electrons in some atoms and these atoms act as small magnets, the magnetic field of the neighbouring atoms can have different directions and they also cancel out each other. Only presence of a large number of unpaired electrons in a material can create a significant magnetic field. This is the root part of the definition of magnetic properties of material.
Answer: the correct answer is: Magnetic materials have many spinning, unpaired electrons
Explanation:
I just took the test
the energy of an onject as it is in motion is defined as?
The energy of an object as it is in motion is defined as Kinetic energy.
Explanation:
The energy that is attained by an object when it is moving is called as Kinetic energy. It is the amount of energy that is essential for inducing an acceleration in an object and making it to displace from its idle position to the destination. When an object attains the acceleration it can have this kinetic energy until there is a change in the speed of the object with which it moves.
The forms of energy changes and it can take any form like thermal, electrical, electromagnetic,etc. Potential and kinetic energy are the two things under which these forms are energy are grouped. There can be a transferring of Kinetic energy from one object to another. The kinetic energy can also take any form of energy.
PLZ HELP ME 4 MINS LEFT 50 POINTS AND BRAINLEIST
Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.
Answer:
Explanation:
Work is applying a force to move an object over a distance. ... Machines make work easier by changing the strength or direction of a force. ... But many everyday objects, such as rakes, bottle openers, and ramps, are machines too. ... A flat surface (plane) set at an angle (inclined); a simple machine used to reduce the force ...
Answer:
true
Explanation:
What is the momentum of a 25.1 g rifle bullet traveling with a velocity of 351 m/sec at a 45 degrees northeast
Answer:
Explanation:hehehee
Final answer:
The momentum of a 25.1 g rifle bullet traveling at 351 m/sec at a 45-degree northeast direction is 8.8101 kg·m/s, with equal components in the north and east directions.
Explanation:
The momentum of an object is given by the product of its mass and velocity. The momentum π of a bullet can be calculated using the formula π = mv, where m is the mass of the bullet (in kilograms) and v is its velocity (in meters per second). Since the mass is given in grams, you will need to convert it to kilograms by dividing by 1000, making 25.1 g equal to 0.0251 kg.
To calculate the momentum of the 25.1 g rifle bullet traveling at 351 m/sec at a 45 degrees direction, you multiply the mass (0.0251 kg) by the velocity (351 m/s) to get the resulting momentum. Since the question specifies a northeast direction, it implies a vector with equal components in the north and east directions.
Momentum calculation:
π = (0.0251 kg)(351 m/s) = 8.8101 kg·m/s
The momentum vector will have equal components of 8.8101/sqrt(2) kg·m/s in the north and east directions due to the 45-degree angle.
a. A child is twirling a 1.52 kg object in a vertical circle with a radius of 67.6
cm at constant speed. The tension in the string is 54.7 N at the bottom of
the circle. (a.) What is the speed of the object?
b. (b) What is the tension in the string at the top of the circle?
Answer:
(a) 4.21 m/s
(b) 24.9 N
Explanation:
(a) Draw a free body diagram of the object when it is at the bottom of the circle. There are two forces on the object: tension force T pulling up and weight force mg pulling down.
Sum the forces in the radial (+y) direction:
∑F = ma
T − mg = m v² / r
v = √(r (T − mg) / m)
v = √(0.676 m (54.7 N − 1.52 kg × 9.8 m/s²) / 1.52 kg)
v = 4.21 m/s
(b) Draw a free body diagram of the object when it is at the top of the circle. There are two forces on the object: tension force T pulling down and weight force mg pulling down.
Sum the forces in the radial (-y) direction:
∑F = ma
T + mg = m v² / r
T = m v² / r − mg
T = (1.52 kg) (4.21 m/s)² / (0.676 m) − (1.52 kg) (9.8 m/s²)
T = 24.9 N
Compare how magnetic forces act through non-magnetic materials and
magnetic materials:
Compare how magnetic forces act through non-magnetic materials and magnetic materials:
Explanation:
Magnet
• Magnet :- is an object which attracts pieces of iron, steel etc towards itself.
Some facts about magnets:-
• When magnet is freely suspended it always align towards north-south direction
• Like poles always repel & opp. poles attract each other.
• Magnet always exist as dipole
• Two poles can never be separated : if we try to cut it then still both the poles will exist even ina small piece of magnet .it automatically develops the lost polarity
Magnet always develop certain area around it where its effect can be felt ie. magnetic field.
MAGNETIC Field
is studied by drawing imaginary lines called magnetic lines of forces.
Characteristics.
• They always originate from North pole & terminate at South pole. This shows that if north pole was free is move it would have mvre towards south pole.
•Place where they are closer indicate strong M. field i.e. at poles.
•Mag. Field lines gives the direction of magnetic force.
•Two magnetic lines will never intersect each other as they give direction of force & force can’t have 2 direction at a time.
M Field lines are closed continuous curves.This is what that happens in magnetic materials .
Non magnetic materials
Magnetic forces 'act through' non-magnetic materialsThese magnetic materials can be used as a shield around a magnet. The domain theory of magnetism tries to explain why metals get magnetised. The magnetic elements have little molecular magnets inside them.Magnets attract only the magnetic materialsTypes of magnetic materials
Soft magnetic materials (e.g. iron) have domains that easily move into line when the metal is placed in a magnetic field but as soon as the field is removed the domains take on a random pattern again. It returns to being unmagnetized straight away.
Hard magnetic materials (e.g. steel) have domains that do not easily move into line when the metal is placed in a magnetic field, a strong field is needed for some time, but then, when the field is removed the domains retain the magnetic pattern. The metal stays magnetic for a long time.
You design an experiment to see how light effects plant growth. You put one plant in a room with no
windows and one lamp. You put another plant bought from the same store that was the same size, on a
windowsill in your kitchen. Two weeks later, the plant in the room with no windows has died. The plant on
the windowsill is growing great! What was the dependent variable?
The temperature in the room.
The life or death of the plant.
The light the plants received
The kind of plants that were bought
Answer:
dependent variable is the light the plant received
Explanation:
Answer:
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Explanation:
the heart rate that indicates your fitness level is the
The heart rate that indicates your fitness level is the Resting Heart Rate.
Explanation:
The statement from Welch says that when we practise more and do an exercise harder, then the heart rate at rest would be low. This is the main reason for considering resting heart rates as a good indicator to one’s fitness level. The normal adult heart rate at rest is 60 to 100 bpm (beat per minute).
In general, a lower heart rate means a calmer heart rate and good heart health. For example, for a well-trained athlete, a normal heart rate can be closer to 40 bpm. Our resting rhythm, the measure of how often the heart beats every minute at rest.
Acceleration usually has the symbol a. It is a vector. What is the correct way
to write the symbol to show that it is a vector?
A. â
B. a
C. a
D. ā
?
Final answer:
The correct notation to show that acceleration is a vector is 'â', denoting both its magnitude and direction. So the correct option is A.
Explanation:
To indicate that acceleration is a vector, the correct notation is to write the symbol 'â' (option A). Vectors are typically notated with an arrow on top, as in 'â', to represent their magnitude and direction. In physics, acceleration is defined as the rate at which velocity changes and it is a vector quantity, meaning it has both magnitude and direction. When acceleration is assumed to be constant, it is often represented simply as 'a', but when specifically referring to it as a vector, the arrow notation is used.
A desktop computer and monitor together draw about 0.6 A of current. They
plug into a wall outlet that is 120 V. What is the resistance, in ohms, of the
computer-monitor combination?
Answer:
200 ohms
Explanation:
Answer:
200
Explanation:
A 866 kg car is traveling at 16.7 m/s around a banked curve with a radius
of 50 m. At what angle would the car have to be banked so that no
friction is required?
Answer: [tex]29.64 \°[/tex]
Explanation:
The expression to calculate the angle [tex]\theta[/tex] of an ideally banked curve in which friciton is not needed is:
[tex]\theta=tan^{-1}(\frac{V^{2}}{r.g})[/tex]
Where:
[tex]V=16.7 m/s[/tex] is the car's velocity
[tex]r.=50 m[/tex] is the radius of the curve
[tex]g=9.8 m/s^{2}[/tex] is the acceleration due gravity
As you may see, this angle does not depend on the mass of the car.
Solving with the given values:
[tex]\theta=tan^{-1}(\frac{(16.7 m/s)^{2}}{(50 m)(9.8 m/s^{2})})[/tex]
Finally:
[tex]\theta=29.64 \°[/tex]
Can someone PLEASEEE help me?
Air is a substance which has the lowest density of about 1.225 kg / m^3.
Explanation:
The mass of a substance per volume describes the density. Larger molecules have more density and more mass. Hence the sound is transmitted slowly. Sound waves are made up of kinetic energy and for the vibration of large molecules, more energy is needed. In general, sound travels faster in liquids than in gases because density is inversely proportional to the speed of sound and the density of air is low.The speed of sound varies with temperature because a change in temperature affects material density. In the air, an increase in temperature increases the speed of sound.What is a combination of two or more simple machines?
Answer:
B) A Compound machine
Explanation: I just took this quiz
2. A 3 kg ball is thrown downward at 4 m/s from a height of 1.5 m. a. What is the kinetic energy of the ball as it leaves the thrower’s hand? b. What force is doing work on the ball as it falls? c. How much work is done on the ball as it falls? d. What is the final kinetic energy of the ball? e. What is the velocity of the ball as it strikes the ground?
Answer:
a) 24 J
b) Gravitational Force
c) 45 J
d) 0
e) 6.782m/s
Explanation:
a) m = 3kg
v = 4m/s
h = 1.5m
KE = ?
0.5 * 3 * 16 = 24J
b) Gravitational force
c) F = ma = 3 * 10 = 30N
Work done = Force * distance = 30 * 1.5 = 45J
d) Final Kinetic Energy of the ball is zero because the ball eventually stops moving
e) velocity of ball as it strikes the ground = v
[tex]v^{2} - u^{2} = 2as[/tex] where
v is the velocity as it strikes the ground
u is the initial velocity
a is acceleration
s is the distance
Now since the ball is thrown downwards, a is positive because the velocity of the ball is increasing as the gravitational force acts on it
u = 4m/s
a = 10
s = 1.5
=> [tex]v = \sqrt{2as + u^{2} }[/tex]
= [tex]\sqrt{(2*10*1.5) + 16}[/tex]
= [tex]\sqrt{46} = 6.782m/s[/tex]
What is the best approximate value for the elastic potential energy (EPE) of the spring elongated by 7.0 meters?
1.5 J
11 J
37 J
74 J
Answer:
C. 37 J
Explanation:
This problem was given with a graph showing that when the spring was elongated to 7 m, the force was approximately 11 N. Seeing as the EPE is calculated by finding the area under the graph and that the area of a triangle is found by using A = 1/2bh, you can see that the givens are b = 7 m & h = 11 N. This means that the the EPE = 1/2 * 7 m * 11 N, which is 38.5N*m. Joules are also represented by N*m so that simplifies to J and seeing as they asked for an approximation, C is the best choice! :)
2. A driver brings a car traveling at 22 m/s to a stop in 2.0 seconds. What is the car's acceleration?
Answer:
11 m/s²
Explanation:
Acc = v/t
Acc = 22 / 2.0
Acc = 11 m/s²
Answer: a= m/s divide by sec
22m/s divided by 2.0sec
11m/s
Explanation: dividing the meter per second [m/s] by the second [s
a body whose mass is 40kg runs up a flight of 30steps,each 150mm high in 6 seconds.Find the average power developed
Answer:g=a=10m/s^2,
M=40kg,
S=150mm/1000=0.15m*30steps each=4.5m,
F=ma=40*10=400N
Power=W/t=F*s/t=F*V=1800/6 = 300W or 0.3kW
Explanation:
On the coast of Georgia, warm air usually picks up water vapor over the Atlantic Ocean. What will happen when the warm, moist air moves inland over hot, dry land?
A
The warm air will become cool, causing water vapor to evaporate and be absorbed by the land.
B
The warm air will rise, causing water vapor to evaporate from the air and generate winds.
C
The warm air will rise, causing water vapor to condense and form clouds.
D
The warm air will sink, causing water vapor to condense and form snow.
Answer:
C. The warm air will rise, causing water vapor to condense and form clouds.
Explanation:
1. Stephanie Schneider is running down the street at 10 m/s. She sees a double-tall latte on
the road ahead of her and starts sprinting. After 5 seconds have passed, Stephanie is
running at 15 m/s. Assuming she does not change direction, what was Stephanie's
acceleration?
Stephanie's acceleration is 1 m/[tex]s^{2}[/tex].
Explanation:
In the present case, the initial velocity of the runner is given as 10 m/s. After 5 s, the runner runs with velocity of 15 m/s. If there is no change in direction, then the acceleration can be found easily as the change in velocity per unit time.
So, [tex]Acceleration = \frac{Change in velocity}{Time}=\frac{(Final velocity -Initial velocity)}{Time}[/tex]
[tex]Acceleration = \frac{15-10}{5}=\frac{5}{5}=1 m/s^{2}[/tex]
Thus, the acceleration will be 1 m/[tex]s^{2}[/tex].
So the change in velocity will lead to an acceleration of 1 m/[tex]s^{2}[/tex].
Answer:15m/s-10m/s over 5s
Explanation:its a fraction the 15m/s and 10m/s are over the 5s
Suppose Earth's mass increased but Earth's diame-
ter did not change. How would the gravitational strength near
Earth's surface change?
Answer: It would increase.
Explanation:
The equation for determining the force of the gravitational pull between any two objects is:
[tex]F = G \frac{m1m2}{r^2}[/tex]
Where G is the universal gravitational constant, m1 is the mass of one body, m2 is the mass of the other body, and r^2 is the distance between the two objects' centers squared.
Assuming the Earth's mass but not its diameter increased, in the equation above m1 (the term usually indicative of the object of larger mass) would increase, while the r^2 would not.
Thus, it goes without saying that, with some simple reasoning about fractions, an increasing numerator over a constant denominator would result in a larger number to multiply by G, thus also meaning a larger gravitational strength between Earth and whatever other object is of interest.
Final answer:
If Earth's mass increased with its diameter unchanged, gravitational strength at its surface would also increase proportionally. The weight of objects on Earth would thus increase in direct relation to the mass increase.
Explanation:
If Earth's mass increased but its diameter remained unchanged, the gravitational strength near Earth's surface would increase proportionally to the mass increase. This is because gravitational force is directly proportional to the mass of the objects. For example, if Earth had 10 times its present mass but the same volume, a person's weight would increase by a factor of 10.
Conversely, with one-third of Earth's present mass, the gravitational force would reduce by a factor of 1/3, and a person would weigh only one-third as much as they currently do. Since the question implies that the gravitational force is what changes with the mass of Earth, we can infer that a greater mass leads to a stronger gravitational pull and thus an increase in weight for objects at the surface, assuming the radius stays constant.
A billiard ball of mass 0.28 kg hits a second, identical ball at a speed of 7.2 m/s and comes to rest as the second ball flies off. The collision takes 250 μs. What is the average force on the first ball? The second ball?
Answer:
(a) -8064 N
(b) 8064 N
Explanation:
(a)
From Newton’s law of motion, Force, F=ma where m is mass and a is acceleration.
Since acceleration is the rate of change of velocity per unit time, then where v is velocity and the subscripts f and I denote final and initial
For the first ball, the mass is 0.28 Kg, final velocity is zero since it finally comes to rest, t is 0.00025 s and initial velocity is given as 7.2 s. Substituting these values we obtain
[tex]F=0.28\times \frac {0-7.2}{0.00025}=-8064 N[/tex]
(b)
For the second ball, the mass is also 0.28 Kg but its initial velocity is taken as zero, the final velocity of the second ball will be equal to the initial velocity of the second ball, that is 7.2 m/s and the time is also same, 0.00025 s. By substitution
[tex]F=0.28\times \frac {7.2-0}{0.00025}=8064 N[/tex]
Here, we prove that action and reaction are equal and opposite
The average force on the first ball is -8,064 N
The average force on the first ball is 8,064 N
The formula for calculating the average force according to Newton's second law is expressed as:
[tex]F=ma\\F=m(\frac{v-u}{t} )[/tex]
m is the mass of the ball
v is the final velocity
u is the initial velocity
t is the time taken
Given the following parameters
m = 0.28kg
v = 0m/s
u = 7.2m/s
t = 250×10⁻⁶secs
Substitute the given parameters into the formula:
[tex]F=0.28(\frac{0-7.2}{0.00025} )\\F=0.28(\frac{-7.2}{0.00025} )\\F=0.28(-28,800)\\F=-8,064N[/tex]
Hence the average force on the first ball is -8,064 N
For the average force on the second ball:
[tex]F=0.28(\frac{7.2-0}{0.00025} )\\F=0.28(\frac{7.2}{0.00025} )\\F=0.28(28,800)\\F=8,064N[/tex]
Hence the average force on the first ball is 8,064 N
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Can someone please help me with these 2 questions
1) A car takes 76 metres to stop once a driver has noticed a hazard. If the thinking distance of the driver was 14m and the speed of the car was 8m/s. how long did it take the brakes to slow the car down to a stop?
2) A lorry travels 28m when stopping from a speed of 4m/s. If its braking distance was 18m, what was the driver's reaction time?
what is the definition of zeroth laws??
Answer:
The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third one, then they are in thermal equilibrium with each other. Accordingly, thermal equilibrium between systems is a transitive relation.
If a wave has a wavelength of 4.5 m and A. Of 0.007 seconds what is the velocity of the wave? be sure to show the steps of your work.
Answer:The wave period is the time it takes to complete one cycle. The standard unit of a wave period is in seconds, and it is inversely proportional to the frequency of a wave, which is the number of cycles of waves that occur in one second.
Explanation:
Answer:
v = 640m/s
Explanation:
Human diseases such as tetanus syphilis and cholera are caused by small cells that lack nucleus the cells can enter the human body and cause disease. Which common name is associated with these cells.
A antibody
B toxin
C bacteria
D virus
A car traveling at a constant speed travels 1000 feet in 12 seconds . In miles , how far will this car travel in 4 hours
The speed is the distance covered by an object at a particular time. The distance covered by the car in 4 hours will be 227.273 miles.
What is speed?The speed is the distance covered by an object at a particular time. Therefore, it is the ratio of distance and time.
[tex]\rm{Speed = \dfrac{Distance}{Time}[/tex]
Given that a car traveling at a constant speed travels 1000 feet in 12 seconds. Therefore, we can write the distance and time as,
Distance = 100 feet = 1000/5280 miles
Time = 12 seconds = 12/3600 hours
Now, the speed of the car can be written as,
Speed = Distance / Time
= (1000/5280 miles) / (12/3600 hours)
= (1000×3600) / (5280×12) miles per hour
= 56.818 miles per hour
Further, the distance that can be traveled by car is,
Distance = Speed × Time
= 56.818 miles per hour × 4 hours
= 227.273 miles
Hence, the distance covered by the car in 4 hours will be 227.273 miles.
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A car traveling at a constant speed travels 175 miles in 4 hours. How many feet will the car travel in 10 minutes?
Answer: 0.26 minutes
Explanation:
Answer: 38,500 feet
Explanation:
look at the attachment where the work is done out
Whích best explains parallel forces?
Answer:
Parallel forces lie on the same plane and they have lines of action that never intersect each other.
Explanation:
Parallel forces definition is - forces acting in parallel lines.
In physics, parallel and antiparallel forces are forces that are oriented in the same or opposite directions, as described by Newton's third law of motion. An example is the force applied to push a filing cabinet, along with the force of friction opposing it.
Explanation:Parallel forces refer to forces that are oriented along the same direction, and antiparallel forces are forces that are oriented in opposite directions. An example of parallel or antiparallel forces can be observed in everyday situations such as pushing a filing cabinet. The force applied by a person to push the cabinet and the frictional force that opposes the motion are an example of antiparallel forces. Additionally, Newton's third law of motion illustrates this concept by stating that for every action, there is an equal and opposite reaction, forming a pair of parallel or antiparallel forces.
Choosing a system of interest is crucial when analyzing forces because it determines which forces are considered internal and which are external. For instance, if the system of interest includes both the Earth and a falling object, the gravitational force between them does not cause acceleration of the system as a whole because it is an internal force. However, if the system is only the falling object, then the gravitational force is external, and does not have an equal and opposite force within the system, leading to acceleration.
In physics, forces can sometimes be unified at extremely short distances and high energies, making the distinctions between them less noticeable. While forces like electromagnetic, weak nuclear, and strong nuclear forces appear distinct, they may be different manifestations of a more fundamental force, as suggested by modern physics. This unification is part of the quest for simplicity and understanding the underlying principles governing the forces of nature.
The 3 states of mater are
Answer:
Solid
liquid
gas
Explanation: