In volleyball, if a ball is served in touches any part of the opposing sideline what happens?

2, 5, and 6 are the correct answers.

The correct statements about Earth's atmosphere are: the most abundant gas is oxygen, carbon dioxide is important for plants, and the troposphere gets colder with increasing height.

The correct statements about Earth's atmosphere are:

Answer:

[tex]64.8^{\circ}C[/tex]

Explanation:

The efficiency of a reversible heat engine is given by:

[tex]\eta = 1 -\frac{T_C}{T_H}[/tex]

where

Tc is the cold temperature (outlet temperature)

Th is the hot temperature (temperature of the source)

In this problem, we know:

[tex]\eta = 63\% = 0.63[/tex]

[tex]T_H = 640^{\circ}C=913 K[/tex]

So, we can calculate the outlet temperature by re-arranging the formula:

[tex]T_C = T_H ( 1 -\eta)=(913 K)(1- 0.63)=337.8 K=64.8^{\circ}C[/tex]

Nitrogen is a crucially important component for all life. It is an important part of many cells and processes such as amino acids, proteins and even our DNA. It is also needed to make chlorophyll in plants, which is used in photosynthesis to make their food.

Answer:

Its B

Explanation:

It converts nitrogen into a form that humans can obtain by eating other organisms.

Answer:

True

Explanation:

By width, we commonly mean the diameter of the pipe. Before, giving some logical examples we will look at the scientific proof of this fact. There was a physicist named Jean Leonard who experimented on fluid flow during the start of 19th century,  He deduced the results as  the flow rate is proportional to the fourth power of pipe radius,

His results can mathematically be expressed as :

Volume flow rate = π X pressure difference X pipe radius 4 X liquid viscosity / 8 X viscosity X pipe length.

Now let us take an example which shows how pipe diameter or radius (half of diameter) affect the flow of water.

Lets suppose we have a pipe that has radius of 2 inches and length of 6 and we want to calculate that what will be the the flow rate if we increase the length of pipe from 2 to 4 inches. When the length is constant, the radius has also got changed by 2 inches.

So, if we assume that temperature, pressure and length is constant and no external factor is affecting the water flow, then according to above equation  the flow rate will change by a factor of 24, or 16.

This shows that the width or radius influence flow rate of water.

Hope it help!

The force of impact would be less in an elastic collision according to Newton's second law, F = ma. This is because elastic collisions spread out the time of impact, reducing acceleration and thus force. In contrast, inelastic collisions have a higher impact force, as kinetic energy is not conserved resulting in a sudden stop and a larger force.

From Newton's second law, F = ma, we know that force (F) is the product of mass (m) and acceleration (a). In a collision, the force of impact would be less when the acceleration (or deceleration) is less. This often occurs in a collision type known as an elastic collision. In an elastic collision, both momentum and kinetic energy are conserved, meaning the objects 'bounce' off each other rather than sticking together. This spreads out the time of impact, thereby reducing the acceleration and thus the force of impact. On the contrary, in an inelastic collision, which results in a higher impact force, the objects stick together and kinetic energy is not conserved, leading to a sudden stop and thus a larger force.

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My answer choice would be A. Cypress Tree

Answer: A :)

Explanation:

Ap*x

Answer

The answer is; A

Fossil fuels are nonrenewable energy sources. This is because the rate at which they can be used by humans will definitely be higher than the rate at which they are replenished. Fossils fuels are formed over millions of years by sedimented planktons being subjected to enormous pressure and temperatures over long periods of time. Humans consume the fossil are quite fast rates that the source of energy can be depleted in some few hundred years.    

Answer:A

Explanation:

Given that:

Ball dropped from a bridge at the rate of 3 seconds

Determine the height of fall (S) = ?

      As we know that, S = ut + 1/2 ×a.t²

                          u =initial velocity = 0

                          a= g =9.81 m/s  (since free fall)

                            S = 0+ 1/2 × 9.81 × 3²

                          S = 44.145 m

44.145 m far is the bridge from water

Answer:

By turning the vehicle "ON" position you can check to see if the gauges light works.        

When we switch ON or turn a key to ON the engine, we can find all the gauges working or not.

The spaceship is either not moving and is in its launch pad here on earth and the water is behaving as it would anywhere else on our planet

or

the spaceship is in outer space somewhere and it has fired up its thrusters and it has created it's own gravitational Force because it is accelerating

or

the spaceship is trying to land on another planet and is slowly coming to the surface of the planet

or

the spaceship is taking off from a planet and the gravitation force of the planet is still in effect.

Answer:

Based on the principle of equivalence, the motion and location of the spaceship are unknown.

The ship may be accelerating in space, where the floor rises up to the water.

The spaceship may be stationary on Earth, where gravity causes the water to fall to the floor.

Explanation:

1. Lambda

The phenomenon described in the problem is called diffraction.

Diffraction occurs when a wave 'bends' around an obstacle or a slit, producing an interference pattern beyond the obstacle/slit. In this example, a wave of light is made passing through two splits: each slit will act as a new source of the wave, producing waves with same wavelength (lambda), and the combination of the two waves produced by the two slits will generate interference on the sistance screen, producing the alternating black and bright bands. However, the diffraction effect does not change the wavelength of the original wave, so it is still lambda.

2. 827 Hz

This phenomenon is called Doppler effect: as the source of a sound moves relative to an observer, the apparent frequency heard by the observer is shifted with respect to the original frequency of the sound, according to the equation:

[tex]f'=\frac{v}{v+v_s}f[/tex]

where

f is the original frequency of the wave

v is the speed of the wave

vs is the velocity of the source relative to the observer, and it is positive if the source is moving away from the observer and negative if it is moving towards the observer

In this problem, the speed of sound is v = 340 m/s. The original frequency of the train whistle is f = 900 Hz, and the velocity of the train relative to the farm house is [tex]v_s = +30.0 m/s[/tex] (it is positive because the whistle is sounded after the train passes the house, so the train is moving away from the house). Substituting into the equation, we find:

[tex]f'=\frac{340 m/s}{340 m/s + 30.0 m/s}(900 Hz)=827 Hz[/tex]

3. 15.0 cm

The difference in decibels between two sounds is given by:

[tex]dL= 10 log (\frac{I_2}{I_1})[/tex] (1)

where I1 and I2 are the intensity of the two sounds.

The intensity of a sound is inversely proportional to the square of the distance from the source:

[tex]I\propto \frac{1}{r^2}[/tex]

So the first equation can be rewritten as:

[tex]dL= 10 log (\frac{r_1^2}{r_2^2}) = 10 log (\frac{r_1}{r_2})^2=20 log (\frac{r_1}{r_2})[/tex]

Here we know:

[tex]dL=60 dB-20 dB=40 dB[/tex]

[tex]r_1 = 15.0 m[/tex]

So we can re-arrange the previous equation to find the distance r2:

[tex]\frac{r_1}{r_2}=10^{\frac{dL}{20}}=10^{\frac{40}{20}}=100\\r_2 = \frac{r_1}{100}=\frac{15.0 m}{100}=15.0 cm[/tex]

Final answer:

A rubbed balloon sticks to a wooden wall due to the phenomenon of polarization, which is caused by the attraction between the charges on the balloon and the induced charges on the wall.

Explanation:

When a balloon is rubbed against a sweater, it becomes charged due to the transfer of electrons, and the attraction between these charges and the opposite charges in a nearby wall is called polarization. Polarization occurs because the balloon's negative charge causes a redistribution of charges within the wall, drawing positive charges closer and repelling negative charges. The balloon does not transfer its charge to the wall (which would be charge transfer), nor does it demonstrate charge conservation (which is the principle that charge cannot be created or destroyed) or charge potential (which refers to the potential energy a charge has due to its position in an electric field).

A) always equal to a right angle

Answer:

Option (A) is the correct answer of this question.

Explanation:

The angle between a changing electric field and the induced electromagnetic wave is always equal to the right angle. The electrical field, the magnetic field and the EM wave are perpendicular. This gives its transverse form to the electromagnetic waves.

According to this question, other options are incorrect.

Answer:

D. The mass number

Explanation:

Isotopes are defined for same atoms

If an atom has same number of protons and same number of electrons but different number of neutrons in it then such pair of atoms is known as isotopes

so we have

same atomic number in all isotopes

since atomic number is same so we can say that total charge of the two atoms must be same

So we will say that since number of neutrons is different in isotopes to sum of neutrons and protons which is known as mass number is different in such pair of atoms

So correct answer is

D. The mass number

The property of the isotopes must be different in "The mass number." The correct answer is D.

Isotopes are atoms of the same element that have the same atomic number (A) and number of protons in their nucleus, but they have different mass numbers (Z). The mass number represents the total number of protons and neutrons in an atom's nucleus. Isotopes of an element have the same number of protons but different numbers of neutrons, which results in different mass numbers.

Let's examine why the other options are not true:

A. The atomic number: The atomic number represents the number of protons in an atom's nucleus. Isotopes of the same element have the same atomic number because they have the same number of protons. So, the atomic number remains constant for isotopes.

B. The electric charge: Electric charge refers to the imbalance of electrons and protons in an atom, which determines its overall charge. Isotopes of the same element have the same number of protons and electrons, thus maintaining the same electric charge.

C. The element name: The element name represents a specific type of atom characterized by a unique number of protons in its nucleus. Isotopes of the same element have the same number of protons, so they share the same element name. The element name does not change for isotopes.

Therefore, the property that must be different for isotopes is the mass number (D).

To learn more about  isotopes click:

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From the train's frame of reference, you are moving toward the rear at your walking speed in the opposite direction of the train's forward motion. From the ground's frame of reference, you are still moving forward relative to the ground but at a slower rate than the train, considering both train speed and walking speed.

When you walk toward the rear of a moving train, your motion can be described from two different frames of reference: one on the train and one on the ground. From a reference point on the train, you are simply moving toward the rear with a certain speed relative to the train. This could be described as you moving in the opposite direction of the train's forward motion, at your walking speed. If the train is moving forward at 10 m/s and you walk toward the rear at 2 m/s, from the train's frame of reference, your velocity would be -2 m/s. Now, let's switch to a reference point on the ground. From this frame of reference, your motion is more complex because you must consider both the speed of the train and your walking speed. If the train is moving forward at 10 m/s and you are walking toward the rear at 2 m/s, your speed relative to the ground would be 10 m/s - 2 m/s, which is 8 m/s in the direction the train is moving. Essentially, you are still moving forward relative to the ground but at a slower rate than the train. It's important to note that there isn't a single, correct reference frame to describe your motion; both descriptions are valid within their respective frames. Motion does not happen in isolation, and how it is perceived depends on the reference frame of the observer.

1. Outer planets are gaseous planets (Jovian Planets). All the outer planets have ring system. They have many number of natural satellites. They have longer period of revolution as compared to inner planets.

2. Outer planets are different from each other in the following way:

The size and mass of the four outer planets is different from each other. Uranus rotates in opposite direction as compared to rest of the planets. Jupiter is the largest planet where as Saturn is the lightest. All the outer planets have different composition of gases and water.

3. Dwarf planets are smaller in size and have irregular shape as compared to true planets. In our solar system, we have 8 true planets and 5 official dwarf planets but can be as many as 10,000 dwarf planets present in Kuiper belt.

4. The outer planets lie beyond asteroid belt in the following sequence: Jupiter, Saturn, Uranus and Neptune. Due to this arrangement, as the distance increases from the Sun, the temperature of the surface of these planets drops.

6. Titan is the largest moon of Saturn. Scientists are interested in studying Titan because of its dense atmosphere and liquid hydrocarbons lakes. Methane lakes are present on its surface. Although there is no water on it but scientists are exploring the possibility of life sustained on hydrocarbons as there is presence of pre-biotic environment with the possibility of biotic environment in sub-surface. It has methane cycle like water cycle on Earth and weather pattern.

Outer planets are similar in composition and have multiple moons and rings but differ in size, atmospheric composition, and structure of moons and rings. Dwarf planets haven't cleared their orbits. The arrangement of outer planets is influenced by gravitational pulls. Titan, Saturn's largest moon, interests scientists due to its Earth-like features.

The outer planets, also known as the gas giants, are similar to each other in that they are composed primarily of gases, like hydrogen and helium, and they all have ring systems and multiple moons. Outer planets include Jupiter, Saturn, Uranus, and Neptune. However, they are different in terms of size, composition of their atmospheres, number and structure of their rings and moons.

Dwarf planets are different from true planets in various aspects. Dwarf planets like Pluto, fail to meet the third criteria in the planet definition which is clearing its orbit. This means there are other bodies of comparable size other than its own satellites in its orbit in space.

The arrangement of outer planets greatly affects their placement as they follow elliptical paths which are affected by the gravitational pull of the Sun and other planets. For instance, the position of Jupiter greatly affects the positions of other outer planets.

Titan is Saturn's largest moon and it is of special interest to scientists due its Earth-like features such as presence of liquid lakes and rains, except that they're made of methane, not water, and its dense atmosphere.

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Since bulb is connected in the closed circuit at the position of D

as well as switch B is also closed in that position so the current will flow through the bulb and bulb will glow in that position

So the most appropriate correct option will be

D. The light bulb will be on

Answer:

D. The light bulb will be on

Explanation:

When a bulb is placed at D it works like a load and will draw the current. The circuit will remain open until the switch B is closed. Once B is closed, the current will start flowing through the bulb and it will turn on.

It can be understood through an experiment as will. You can connect a small LED with a battery and see for yourself that the LED turns on.

Answer:

static friction

Explanation:

static prevents objects from moving

Given data

  efficiency (η) = 65 %

                        = 0.65

  Machine provides (Work done by the machine) = 1300 × 50

                                                                                 = 65000 J

  efficiency (η) = work done by the machine ÷ work supplied to the machine

               0.65 =  65000 ÷ Input work

              Input work = 100000 J

                                = 100 KJ

the answer is B a freckle I just had this as a Study Island and got it right.

Ans. (B). a freckle.

Sunspots can be defined as temporary phenomena on the photosphere of sun, which appears as spot darker than its surrounding regions. Freckles on the face can model the behavior of sunspots are they represent spots brown spots on skin, darker than face complexion.

Freckles are resulted due to concentrated melaninized cells, having melanin (a type of skin pigment).

Thus, the correct answer is option (B).

The "Big Bang" theory is the best known explanation for the constant cosmic background radiation.

Real scientists don't use evidence to support their theories.

Real scientists propose theories to explain the observed evidence.  After that, they try every way they can think of to prove that the theory is False.

Answer:

There is constant cosmic background radiation.

Explanation:

The detection of constant cosmic background radiation provided an evidence for the Big Bang theory. The cosmic microwave background radiation is considered as remnant radiation of the early stages of the universe. The cosmic microwave background radiation was detected in all the directions. The average temperature of the background radiation is 3 K.

Answer:

16.935 N

Explanation:

In order to make the box start moving, the level force applied on the box (F) must be greater than the force of static friction that keeps the box at rest, which is equal to

[tex]F_f = \mu_s (mg)[/tex]

where

[tex]\mu_s = 0.5645[/tex] is the coefficient of static friction

(mg) = 30 N is the weight of the box

Therefore, the condition for F must be:

[tex]F \geq F_f\\F \geq \mu_k (mg)=(0.5645)(30 N)=16.935 N[/tex]

So, the applied force must be greater than this value.

Answer:

Simple machines make work easier by exchanging

for example , If you need to lift a object in the back of pickup truck, a ramp can be employed to make work easier. rolling the object up the ramp requires  much less force.

Answer:  176.4 Joules

Explanation: Potential energy of a body is defined as the energy possessed by virtue of position.

Potential energy [tex]=m\times g\times h[/tex]

m = mass of the body = 6 kg

g = acceleration due to gravity = [tex]9.8 ms^{-2}[/tex]

h = height of body = 3 m

Potential energy [tex]=6 kg\times 9.8ms^{-2}\times 3m=176.4kgm^2s^{-2}[/tex]

= 176.4Joules                 {[tex]1kgm^2s^{-2}=1Joule[/tex]}

p=F/S=>S=F/p=5*10³/12=416.66 m²

It's POTABLE water, not 'portable'.

It's water that's safe to drink and tastes OK.

'D. 18 feet' sounds right

B. 4.5 feet is the correct answer

Just finished this it is B. Centrifugal force

Answer:

B

Explanation: