it is often said that the balmer series lies in the visible portion of the electromagnetic spectrum is this true?

Answer:an object reflecting device

Explanation:

Answer:

10.21 m/s

Explanation:

∆x =( v ^2 sin(2θ))/ g

rearrange this to get

v=√Δx·(g÷ sin(2θ))

Plug it in

v=√10·(-9.8÷sin(2·35))

Solve

v=10.21

Answer:

E

Explanation:

All others conduct electricity and heat.

Answer:

E.Rubber

Explanation:

Rubber is the best insulator, they have them coated around electricity wires, while metals are good conductors.

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The acceleration due to gravity on asteroid X is approximately  0.5 meter/secon^2. Hence, option (D) is correct.

The acceleration an object experiences as a result of gravitational force is known as acceleration due to gravity. M/s^2 is its SI unit. Its vector nature—which includes both magnitude and direction—makes it a quantity. The letter g stands for gravitational acceleration.

Given that:  An astronaut weighs 500 Newtons on Earth and 25 newtons on asteroid X.

Hence,  The acceleration due to gravity on asteroid X is :

= acceleration due to gravity on Earth × (25 N/500N)

= 10 meter/secon^2 × (1/20)

= 0.5 meter/secon^2 ( approx.)

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The frequency of the G allele in the population is 0.4, the correct option is B. 0.4.

The frequency of beetles with glabrous elytra in a population of ground beetles is 0.36. The frequency of the G allele is to be calculated, assuming that the population is in Hardy-Weinberg equilibrium.

What is Hardy-Weinberg equilibrium? The Hardy-Weinberg equilibrium is a model that describes the genetic makeup of a non-evolving population.

This model postulates that the genetic variation in a population remains constant from generation to generation in the absence of disturbing influences such as mutation, migration, or natural selection.

According to the Hardy-Weinberg equilibrium, the frequency of alleles and genotypes remains constant if certain conditions are met.

The Hardy-Weinberg equilibrium is represented by the following equation:p2 + 2pq + q2 = 1 Where:p2 = frequency of homozygous individuals (GG)2pq = frequency of heterozygous individuals (Gg)q2 = frequency of homozygous recessive individuals (gg)p + q = 1Now let's move on to the calculation of the frequency of the G allele.

The frequency of individuals with the gg genotype can be obtained from the following equation:q2 = 0.36q2 = 0.36^(1/2)q = 0.6

The sum of the frequency of all genotypes must be equal to 1, which can be used to calculate the frequency of the G allele:p + q = 1p = 1 - qp = 1 - 0.6p = 0.4The frequency of the G allele in the population is 0.4.Therefore, the correct option is B. 0.4.

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A basketball player jumps straight up to grab a rebound. When the player jumps up, they exert a force on the ground, which is equal and opposite to the ground’s reaction force on the player. Due to this force, the player accelerates upwards, and when they reach their maximum height, their velocity becomes zero.

Rebounds are essential components of the game of basketball. A rebound takes place when a player recovers the ball after a missed shot. Usually, the player who jumps the highest has the highest chance of recovering the ball. The height of the jump of a player depends on various factors such as the player's strength, jumping technique, and speed.A basketball player jumps straight up to grab a rebound. When the player jumps up, they exert a force on the ground, which is equal and opposite to the ground’s reaction force on the player. Due to this force, the player accelerates upwards, and when they reach their maximum height, their velocity becomes zero. At the maximum height, the player’s potential energy is the highest, and the kinetic energy is zero.The player begins to move downwards due to gravity, which is a force acting on the player. At this point, the player’s potential energy begins to convert into kinetic energy, and the player’s velocity increases. Finally, the player lands back on the ground. The landing should be done with care because a wrong landing may lead to injuries.

A basketball player jumps straight up to grab a rebound. The jump is a complex process that involves a force exerted by the player on the ground, which accelerates the player upwards. The player reaches their maximum height when their velocity becomes zero, and the player’s potential energy is the highest. When the player begins to move downwards due to gravity, the potential energy begins to convert into kinetic energy, which leads to an increase in velocity. Finally, the player lands back on the ground.

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The total distance described by the rubber ball before it comes to rest is 100 meters.

At the first drop, the ball falls from a height of 50 meters, and then rebounds to a height of 25 meters. So, the distance covered in the first drop and rebound is 50 + 25 = 75 meters.

At the second drop, the ball falls from a height of 25 meters and rebounds to a height of 12.5 meters. So, the distance covered in the second drop and rebound is 25 + 12.5 = 37.5 meters.

At the third drop, the ball falls from a height of 12.5 meters and rebounds to a height of 6.25 meters. So, the distance covered in the third drop and rebound is 12.5 + 6.25 = 18.75 meters.

This process repeats until the height of the rebound is less than 0.01 meters, at which point we consider the ball to have come to rest.

The total distance covered by the ball is the sum of all the distances covered during each drop and rebound, which is:

75 + 37.5 + 18.75 + 9.375 + 4.6875 + 2.34375 + ...

This is a geometric series with first term 75 and common ratio 1/2. Using the formula for the sum of an infinite geometric series, we get:

total distance = 75 / (1 - 1/2) = 100 meters.

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Answer:

The rate of change of distance is defined as speed.

Explanation:

The speed is defined as the rate of change of distance.

Speed = distance/ time

When we know the distance and the time, we get the value of speed. So, e know that who is moving fast or slow.

hen a graph is pltted beteen the distance and time, the slope of the graph gives the value of speed. So, by checking the slopes, hoseslope ismore, the speed is more and thusit is moving faster.

So, i agree with the statement.  

, The density of the metal with a simple cubic structure is approximately \(8.93 g/cm^3.\)

To determine the density of the metal with a simple cubic structure, we can use the following formula:

Density = (Atomic weight)/(Volume of the unit cell x Avogadro's number)

For a simple cubic structure, the volume of the unit cell can be calculated as:

The volume of unit cell = \(a^3\)

where a is the length of the edge of the cube.

In a simple cubic structure, the atoms touch along the edge of the cube. So, the edge length can be calculated as:

a = 2 x Atomic radius

Substituting the given values, we get:

a = 2 x 0.126 nm = 0.252 nm

The volume of the unit cell is:

Volume of unit cell = \(a^3\)= \((0.252 nm)^3\) = 0.016 \(nm^3\)

Now, we can substitute the values into the density formula:

Density = (70.4 g/mol)/(0.016 \(nm^3\) x 6.022 x \(10^23\)/mol)

Density = 8.93 \(g/cm^3\)

Therefore, the density of the metal with a simple cubic structure is approximately\(8.93 g/cm^3.\)

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Translated Question: If a metal had the simple cubic structure, how is it shown in the figure. Yes its atomic weight is 70. 4 g/mol and the atomic radius is 0.126 nm. determine the density

Answer:

110 mL

Explanation:

Ideal gas law:

PV = nRT

Assuming the container isn't rigid, and the pressure is constant, then:

V/T = V/T

Plug in values (remember to use absolute temperature).

V / 293 K = 150 mL / 393 K

V = 110 ml

Hope u understood!

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The statement, developing a heliocentric theory, describes the kind of work of nicolaus copernicus performed. Option b is correct.

Nicolaus Copernicus was a Polish astronomer who is widely credited with developing the heliocentric theory, which proposes that the sun is at the center of the universe, with the planets orbiting around it. This theory was a major shift from the previously accepted geocentric theory, which placed the Earth at the center of the universe. Copernicus' work was instrumental in the scientific revolution and laid the groundwork for future astronomical research. Hence option b is the correct choice.

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--The complete answer is, Which statement describes the kind of work of nicolaus copernicus performed?

a. inventing analytic geometry

b. developing a heliocentric theory

c. experimenting on human bodies

d. studying prisms and the nature of light--

Hi there!

We can use the following equation for a point charge in a magnetic field:

\(\large\boxed{F_B = qv \times B}\)

\(F_B\) = Force due to magnetic field (7.6 × 10⁻¹³N)
\(q\) = Charge of particle (1.6 × 10⁻¹⁹ C)

\(v\) = velocity of particle (6.6 × 10⁶ m/s)

\(B\) = Magnetic field strength (1.8 T)

Or, without the cross product:
\(F_B = qvBsin\theta\)

θ = angle between particle's velocity and field

We can rearrange to solve for theta:
\(\frac{F_B}{qvB} = sin\theta\\\\\theta = sin^{-1} (\frac{F_B}{qvB})\)

Solve for theta:
\(\theta = sin^{-1} (\frac{7.6*10^{-13}}{(1.6*10^{-19})(6.6*10^6)(1.80)}) = \boxed{23.57^o}\)

Answer:

92km

Explanation:

Given parameters:

Duration of the journey  = 6hrs

Average speed  = 58km/hr

  Now, let us find the total distance of the journey;

 Distance  = Speed x time

  Distance  = 58 x 6   = 348km

So;

 Average speed for the first 4hrs  = 64km/hr

                                               Time  = 4hrs

     Distance  = 64 x 4 = 256km

For the rest of the journey, the student will cover;

                               = 348km  - 256km

                               =  92km

The flux through the two flat ends of a cylindrical Gaussian surface surrounding an infinite line of charge is 0 because the electric field is parallel to these flat surfaces, and thus, no field lines pass through them.

When we consider a cylindrical Gaussian surface surrounding an infinite line of charge, we can find the electric flux through the Gaussian surface. The electric field lines from the line of charge are radially outward and perpendicular to the surface of the cylinder.

Since the electric field is always parallel to the flat ends of the cylindrical Gaussian surface, there will be no electric flux passing through the flat ends of the cylinder. This is because the angle between the electric field and the area vector of the flat ends is 90 degrees, and the electric flux (Φ) is given by Φ = EAcosθ, where E is the electric field, A is the area, and θ is the angle between the electric field and the area vector. When θ = 90 degrees, cosθ = 0, so the flux through the flat ends of the cylinder is 0.

The flux through the two flat ends of a cylindrical Gaussian surface surrounding an infinite line of charge is 0 because the electric field is parallel to these flat surfaces, and thus, no field lines pass through them.

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Answer:

Favorable sites include the tops of smooth, rounded hills; open plains and water; and mountain gaps that funnel and intensify wind. Wind resources are generally more favorable for electricity generation at higher elevations above the earth's surface

The magnetic force on the wire will be 0.075 N. The magnetic force is found as the product of the magnetic field,current,length and the sin of the inclination.

It is the type of field where the magnetic force is obtained. With the help of a magnetic field. The magnetic force is obtained, it is the field felt around a moving electric charge.

The given data in the problem is;

L is the length= 20. 0 cm

I is the current = 2. 50 A

The magnetic force on the wire;

F=BILsinθ

F=0.30 T×2.50 A×0.20 m ×sin30°

F = 0.075 N

Hence,the magnetic force on the wire will be 0.075 N.

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Answer:

C. 22N

Explanation: Note that we are considering a uniform beam XY which implies that it will be evenly divided. That is the weight will be in between.

One of the laws of equilibrium states that the sum forces across the clockwise moment = sum of forces across the anticlockwise moment

Hence from the diagram we have

(8×50)+(4×10) = 20 × X

400+40 = 20X

440 = 20X

X = 440/20

X = 22N

Hence the answer is option C which is 22N

Explanation:

As you can see in the picture, we want the swimmer to go on a straight line, so the speed of the water must be equal to the speed of the swimmer along the x-axis. We also know the value of v, so we can calculate the of the cosine of the angle (alpha) between Vx and V. Thanks to the fundamental relation of gioniometry (cos^2(x) + sin^2(x) = 1) we can find the sine of alpha and calculate Vy. With Vy we can calculate the time that the swimmer will use for reaching the dock: s = Vy * t => t = s/(Vy).

I'll let you do all the calculations, you just have to plug in values.

a)The direction that she must aim herself through the water to arrive at the dock will be 73.7°.

b)The time it takes for the swimmer to cross the river will be 240 seconds.

Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by u for the initial speed while v for the final speed. its si unit is m/sec.

Given data;

The maximum speed of the swimmer In still water,v=1.25m/s.

Speed of river = 0.35m/s [E]

α is the direction that she must aim herself through the water to arrive at the dock.

t is the time it takes for the swimmer to cross the river

The distance from the starting point to the dock is,s = 300 m

If the swimmer were to swim straight, the water's speed along the x-axis would have to match that of the swimmer.

\(\rm v_w = v_x = 0.35 \ m/sec\)

α is the angle between vx and v

The value of the

\(\rm cos \alpha = \frac{v_x}{v} \\\\ \alpha = cos ^{-1}(\frac{0.35}{1.25} )\\\\ \alpha = 73.7 ^0\)

The time that the swimmer will use for reaching the dock;

s = V×t

t = s/(v)

t=300 m / 1.25 m/sec

t = 240 seconds

Hence, the direction that she must aim herself through the water to arrive at the dock. and it takes for the swimmer to cross the river will be 73.7° and 240 seconds respectively.

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If a  body is falling freely under gravity, then the distance of fall during an interval of time 1st and 2nd of it's motion would be 15 meters.

There are three equations of motion given by  Newton,

v = u + at

S = ut + 1/2 × a × t²

v² - u² = 2 × a × s

The distance traveled after 1 second ,

S₁ = 0 + 0.5 × 10 × 1

S₁= 5 meters

The distance  traveled after 1 second,

S₂ = 0 + 0.5 × 10 × 2²

S₂ = 20 meters

The distance traveled  during an interval of time 1st and 2nd of it's motion = 20 - 5

            = 15 meters

Thus, If a  body is falling freely under gravity, then the distance of fall during an interval of time 1st and 2nd of it's motion would be 15 meters.

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The answer is b. false. The multiplicative inverse of 12 to the power of 35 modulo 37 is not 12.

In modular arithmetic, the multiplicative inverse of a number a modulo n is another number b such that (a * b) % n = 1. In this case, we need to find the multiplicative inverse of 12^35 modulo 37.

To calculate the multiplicative inverse, we would typically use Euler's totient function and the extended Euclidean algorithm. However, since the values are quite large, performing the calculations manually would be impractical. Therefore, we can use a computer program or calculator capable of handling modular arithmetic to obtain the accurate result.

In this case, the multiplicative inverse of 12^35 modulo 37 is not 12. The specific value would need to be computed using appropriate tools.

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Answer:

While the car is going towards the standing person on the sidewalk he is listening the pitch of the horn higher then it is.

When the car passes the person on the sidewalk and goes away, the horn's pitch become lower (for the person standing on the sidewalk).

For the driver, the pitch is always the same.

Explanation:

Is the doppler effect.

When the car is approaching, the sound waves must travel a smaller space than the previous one and they take less time to reach the standing person. So, sound waves reach the standing person with a higher frequency.

It happens the opposite when the car is going away: the sound waves need to travel more space and take more time to reach the person on the sidewalk. So, the frequency of the waves is lower.

Answer:

3 to 4

Explanation:

By the time they reach 3 they have achieved speaking 200 or even more

Answer:

50 cm3 of 1M hydrochloric acid is a six-fold excess of acid. In this reaction, the magnesium and acid are gradually used up. However the acid is in excess, so it is mainly the loss of magnesium (surface area becomes smaller) that causes the change in the rate.

Explanation:

The equation for the reaction is: magnesium + hydrochloric acid → magnesium chloride + hydrogen

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

Students follow the rate of reaction between magnesium and the acid, by measuring the amount of gas produced at 10 second intervals.

3 cm of magnesium ribbon typically has a mass of 0.04 g and yields 40 cm3 of hydrogen when reacted with excess acid. 50 cm3 of 1M hydrochloric acid is a six-fold excess of acid.

In this reaction, the magnesium and acid are gradually used up. However the acid is in excess, so it is mainly the loss of magnesium (surface area becomes smaller) that causes the change in the rate.

If a graph of volume (y-axis) against time (x-axis) is drawn, the slope of the graph is steepest at the beginning. This shows that the reaction is fastest at the start. As the magnesium is used up, the rate falls. This can be seen on the graph, as the slope becomes less steep and then levels out when the reaction has stopped (when no more gas is produced).

The reaction is exothermic, but the dilute acid is in excess and the rise in temperature is only of the order of 3.5˚C. There is some acceleration of the reaction rate due to the rise in temperature. Some students might notice the flask becoming slightly warm and they could be asked how this would affect the rate of reaction, and how they might adapt the experiment to make it a ‘fair test’.

Additional information

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.

To solve this we must be knowing each and every concept related to Le Chatelier′s Principle. Therefore, when concentration of hydrochloric acid was changed. the concentration of product will also change.

When a stress is given to a chemical system in equilibrium, the equilibrium shifts to alleviate the tension, according to Le Chatelier′s Principle. In other words, it can anticipate the outcome of a chemical reaction with response to changes in temperature, concentration, quantity, or pressure.

While Le Chatelier's concept can be used to anticipate the reaction to a change from equilibrium, it doesn't explain why the system behaves as it does (at the molecular level).

Mg(s) + 2 HCl(aq) \(\rightarrow\) MgCl\(_2\)(aq) + H\(_2\)(g)

According to  Le Chatelier′s Principle, when concentration of hydrochloric acid was changed. the concentration of product will also change.

Therefore, when concentration of hydrochloric acid was changed. the concentration of product will also change.

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Adam's uncertainty about whether he will be thanked or criticized for helping cook dinner relates to his behavior-outcome expectancies.

Behavior-outcome expectancies refer to a person's beliefs about the outcomes or consequences that are likely to follow from their actions. In this scenario, Adam is uncertain about the potential outcomes of his behavior, specifically whether he will be thanked or criticized for helping cook dinner. In this case, Adam's uncertainty specifically revolves around his behavior-outcome expectancies (D). He is unsure about the potential responses he will receive for his action of helping cook dinner. This uncertainty may stem from factors such as past experiences, social norms, or the specific dynamics and expectations within his household. Adam's uncertainty highlights the importance of understanding and managing behavior-outcome expectancies in interpersonal interactions and decision-making processes.

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The highest frictional force is 1.35 N, which is the result that comes closest to A (1.4 N).

Since the body's acceleration is determined by the differential of velocity with time, which is zero if velocity is constant, the block's steady downward motion indicates that the body's acceleration is zero. Hence, there is no net force exerted on the body.

Ff(max) = μFn

where Ff(max) is the maximum force of friction, μ is the coefficient of friction, and Fn is the normal force.

In this case, the weight of the box is the same as the normal force, so:

Fn = 4.5 N

Ff(max) = 0.30 x 4.5 N = 1.35 N

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I can help you.

I can make a slides and send it to you. this is actually very simple. just takes some time. I can do it.

Answer:

the same number of electron shells

Explanation:

The most common injury related to electrical hazards are Electrical burns.

What are electrical hazards?

An electrical burn is a type of skin burn that develops when your body comes into contact with electricity. It is possible for electricity to pass through your body when it comes into contact with it. When this occurs, the voltage has the potential to harm tissues and organs.

Hence, The most common injury related to electrical hazards are Electrical burns.

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Answer:

Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume.