2.
A ball player hits a home run, and the ball just clears the wall which is 22.0 m high.
The ball is hit at an angle of 37.0" with a velocity of 45.0 m/s. If the ball is hit from
a height of 0.750 m above the ground, (a) How long is the ball in the air until it
clears the wall while on its way down? (b) How far is the wall from home plate?

The article "Sunrise, Sunset...or Not?" by ReadWorks has a more formal tone compared to "The Ever-Changing Sky" by Megan McGibney.

In "Sunrise, Sunset...or Not?" the author uses scientific and technical terms such as "counterclockwise," "Arctic Circle," and "phenomenon," and provides a detailed explanation of the scientific reasoning behind the rising and setting of the sun.

In contrast, "The Ever-Changing Sky" by Megan McGibney has a more casual tone, using more colloquial language such as "clear day," "bright and shiny," and "People have always looked up at the sky with wonder." The author also uses phrases like "guess how long" and "right!" which implies that the author is addressing a less formal audience and is being conversational.

In all, "Sunrise, Sunset...or Not?" has a more formal tone because of its use of technical language, explanation of scientific concepts, and a generally informative and explanatory writing style.

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Sunrise, Sunset...or Not?

by ReadWorks

The sun is a wonderful thing for Earth. It is a star that heats the planet and makes life on

Earth possible. In addition, its light shines onto the planet. It is Earth's ultimate source of

energy.

Summer days may be longer than winter days, but for most people, the sun seems to do the

same thing each day: it appears to come up in the east for the day, and it appears to go down

in the west for the night. The sun looks like it rises in the east and sets in the west because of

how the earth spins in space. It spins toward the east, or counterclockwise. This means that

when most people look at the sky in the morning, the sun will first appear in the east.

The earth takes 24 hours to complete one turn. For most places on Earth, there is a daytime

and nighttime every 24 hours. But in some places for many days at a time, the sun might stay

up in the sky, or it might not even come up above the horizon.

In some parts of the world, the sun can be up in the sky for months. During part of the spring

and summer in Earth's Northern Hemisphere, the Northern Hemisphere is tilted towards the

sun so much that the sun in northern Alaska, which is located in the Arctic Circle, never goes

below the horizon. The Arctic Circle is an area at the top of the earth. In Barrow, Alaska, the

sun doesn't set for almost three months! This phenomenon is called the midnight sun, when

the sun has not set at midnight. Try sleeping through that!

During parts of the fall and winter in Earth's Northern Hemisphere, the Northern Hemisphere

is tilted in such a way that the sun doesn't come over the horizon in northern Alaska for a little

over two months. Therefore, nights last more than 24 hours. This phenomenon is called the

polar night. Although the sun never rises above the horizon during parts of the fall and winter

in the Arctic Circle, enough light often shines so that people who live there don't need

The Ever-Changing Sky

The Ever-Changing Sky

by Megan McGibney

Look up at the sky on a clear day. You will see the sun. It is bright and shiny, warming much of

what its light touches. Look up at the sky again at night. You may see the stars. They are also

bright and shiny, glimmering in the dark sky. You may also see the moon. It looks bright and

shiny, reflecting light from the sun. People have always looked up at the sky with wonder.

Some have even studied the sun, moon, and stars. These people, called astronomers, have

learned that those objects in the sky do not stay in the same place all the time.

The Ever-Changing Sky

extra quarter of a day.

Let's take a closer look at the moon. The earth does not revolve around the moon. Instead,

the moon revolves around the earth. It takes the moon about four weeks to complete a

revolution around the earth. The portion of the moon we, here on Earth, see changes over

this period of about four weeks as the moon's position around the earth changes. The

moonlight we see at night is the moon's reflection of sunlight onto Earth. The different ways

the moon appears to us are known as the moon's phases. The moon's phases depend on the

moon's position in relation to the earth and the sun.

The four-week period starts and ends with the new moon. The new moon cannot be seen

because the side of the moon lit by the sun is facing away from the earth.

Use the articles "The Ever-Changing Sky" and "Sunrise, Sunset...or Not?" to answer

questions 6.

6. Which article has a more formal tone? Support your answer with details from both texts.

Answers will vary.

The volume of the ark is 11163 cubic feet.

The term volume of a box refers to the product of the length, width and height of the box. We have been told that the ark of Noah could be likened to a box and we have been asked to obtain its volume.

Hence;

width = 3.5  * 50 = 175 inches or 14.58 feet

length = 300 * 3.5 = 1050 inches or 87.5 feet

height = 30  * 3.5 = 105 inches or 8.75 feet

Volume of the ark = 14.58 feet * 87.5 feet *  8.75 feet

Volume of the ark = 11163 cubic feet

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The following statement is not a scientific hypothesis:

C. Halle Berry is attractive.

A scientific hypothesis is a proposed explanation for an observation or pattern in nature that can be tested through further investigation and experimentation. It should be testable, falsifiable, and based on evidence.

Neon atoms emit red light. This is a scientific hypothesis that can be tested and confirmed by looking at the spectrum of light emitted by neon atoms.

B. There is an attractive force between the earth and moon. This is a scientific hypothesis that can be tested and confirmed by measuring the force of gravity between the earth and moon.

D. Summer days are the hottest of the year. This is a scientific hypothesis that can be tested and confirmed by collecting temperature data during the summer months.

E. The sky is blue. This is a scientific hypothesis that can be tested and confirmed by observing the sky under different atmospheric conditions.

The statement "Halle Berry is attractive" is a subjective opinion that cannot be tested or confirmed through scientific investigation, hence it is not a scientific hypothesis. Attractiveness, as a concept, can vary widely based on personal, cultural, and social factors.

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Answer:

Since the momentum of the body remains constant ( conserved) the trolley slows down (its velocity reduces) since its mass increases.

Answer:

b

Explanation:

Answer:1 because

Explanation: it’s pointing to the earth and gravity

Pulls things down to earth

Answer:

45.9m

Explanation:

Given parameters:

Final velocity  = 30m/s

Initial velocity  = 0m/s

Unknown:

Time it takes for the object of fall  = ?

Height of fall = ?

Solution:

For the first problem, we use the equation below to solve for t;

      V = U + gt

V is the final velocity

U is the initial velocity

g is the acceleration due to gravity

t is the time taken

          30  = 0 + 9.8 x t

          30  = 9.8t

            t  = \(\frac{30}{9.8}\)  = 3.1s

Now, height of fall;

  V² = U²  + 2gH

   30² = 0² + 2 x 9.8 x H

   900  = 19.6H

      H  = 45.9m

Battery-powered clocks and Washing machines are objects that transform chemical energy into mechanical energy.

Chemical energy is a type of energy that is stored in the bonds of a chemical. It is converted into thermal energy when people burn wood or burn gasoline in the engine of a car. Mechanical energy is a type of energy that is stored in objects by tension. Compressed springs and stretched bands are examples of mechanical energy.

Mechanical energy i.e. kinetic energy or potential energy is the energy that is present in an object in motion or the energy that is stored in objects due to their position. Mechanical energy is a type of renewable energy.

So we can conclude that options A and C are the correct answers.

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Answer:

10.4 m/s

Explanation:

I just know it's right!

The hypothesis is, the thickness of transparent glass affects how much light passes through. Option A is correct.

A hypothesis is a proposed explanation or prediction for a phenomenon or observation that is based on limited evidence and subject to testing and validation through further investigation. It is an essential part of the scientific method, which involves developing a research question, making observations, and forming a hypothesis to explain the observed phenomenon.

The hypothesis should be testable, falsifiable, and based on evidence and reasoning. Testing the hypothesis involves designing experiments and collecting data, which can either support or refute the hypothesis. If the hypothesis is supported by the data, it may be further developed into a scientific theory, which is a widely accepted explanation of a natural phenomenon that has been extensively tested and validated. Option A is correct.

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A physical quantity is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed as the combination of a numerical value and a unit. For example, the physical quantity mass can be quantified as n kg, where n is the numerical value and kg is the unit.

Answer:

a property of a material or system that can be quantified by measurement

have a nice day!!!

The near point of a human eye is about a distance of 25 cm.

The closest distance that an object may be viewed clearly without straining is known as the near point of the eye.

This distance (the shortest at which a distinct image may be seen) is 25 cm for a typical human eye.

The closest point within the accommodation range of the eye at which an object may be positioned while still forming a focused picture on the retina is also referred to as the near point.

In order to focus on an item at the average near point distance, a person with hyperopia must have a near point that is further away than the typical near point for someone of their age.

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Explanation:

this question is related to the mirror.

first, we will see the formula for how things are related to it.

The mirror formula is given as

Where

is the focal length of the mirror,

is the distance of the image from the mirror and

is the distance of the object from the mirror.

we can assume that the focal length of the mirror is some value let's say 10 cm.

and an object that is placed in front of the mirror is at a 15 cm.

plugging all the values in the above relation, we get

we can see that image of the object will be formed at 6 cm towards the right.

now look at the formula again

as we increase the distance of the object the image of the object move in the right direction. or we can say distance of the image is also increase.

Thus, we can conclude that as we increase the object's distance, the distance of the image will also be increased in the opposite direction.

Answer:

A) 2

Explanation:

Given;

magnetic field of the coil, B = 1.6 T

frequency of the coil, f = 75 Hz

maximum emf developed in the coil, E = 56.9 V

area of the coil, A = 0.15 m x 0.25 m = 0.0375 m²

The maximum emf in the coil is given by;

E = NBAω

Where;

N is the number of turns

ω is the angular velocity = 2πf = 2 x 3.142 x 75 = 471.3 rad/s

N = E / BAω

N = 56.9 / (1.6 x 0.0375 x 471.3)

N = 2 turns

Therefore, the value of N is 2

A) 2

Answer:

BS33

Explanation:

its a cable length meter used for measuring length of all kinds of wires.

Answer:

1.9

Explanation:

Efficiency=mechanical advantage/velocity ratio×100

95=M.A/2×100

95=50M.A

M.A=95/50=1.9

The mechanical advantage of the inclined plane is approximately 2.1053, and the effort required to raise the load of 400 newtons is approximately 189.78 newtons.

To determine the mechanical advantage and effort required for the inclined plane, we can use the formula:

Mechanical Advantage (MA) = Velocity Ratio (VR) / Efficiency

Effort Required = Load / Mechanical Advantage

Given:

Velocity Ratio (VR) = 2

Efficiency = 95% = 0.95

Load = 400 newtons

Calculate the Mechanical Advantage (MA):

MA = VR / Efficiency

MA = 2 / 0.95

MA ≈ 2.1053

Calculate the Effort Required:

Effort Required = Load / MA

Effort Required = 400 / 2.1053

Effort Required ≈ 189.78 newtons

So, the mechanical advantage of the inclined plane is approximately 2.1053, and the effort required to raise the load of 400 newtons is approximately 189.78 newtons.

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The purpose of the chiller is to remove heat from the air and is therefore denoted as option A.

This is a type of device which is referred to as type of a cooling system that removes heat by circulating heat-absorbing a refrigerant through a series of mechanisms through which the heat is released.

The result of this process is that the heat in the air is removed as a result of the refrigerant being adequately circulated and then the environment becomes cooler and is therefore the reason why it was chosen as the correct choice.

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So, the inductance would be hence equal to I =0.86cos(120 t + π/2).

Inductance is a property of an electrical circuit component, such as a coil or a solenoid, that causes it to oppose any change in the current flowing through it. When the current through an inductor changes, a voltage is induced in the inductor that opposes the change in current. This voltage is known as the back electromotive force (EMF) and is proportional to the rate of change of current. The unit of inductance is the henry (H)

The equation of current is  

Explanation:

Resistance, R = 12 ohm

Inductance, L = 0.06 H

E (t) = 12 cos (120 t)

Compare with the standard equation,

E= E₀cos(2\(\pi\)ft)

2\(\pi\)ft = 120t

w= 2\(\pi\)f = 120 rad/s

So, the inductive reactance is

XL = w L = 120 x 0.06 = 7.2 ohm

The impedance of the circuit is

Z =\(\sqrt12 ^{2} +\sqrt[]{} 7^{2}\)

Z=140 Ohm.

The current leads  by 90degree so the equation of current is

I = E₀cos(120 t + π/2)

I = 12/14cos(120 t + π/2)

I =0.86cos(120 t + π/2)

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Answer:

When the piano is dropped, the first force acting on it will be the gravitational force, that accelerates the piano at 9.8m/s^2 downwards.

As the piano accelerates, the velocity increases, now appears other force, the air resistance, that opposes to the motion of the piano.

As the velocity of the piano increases, also does the force that the air applies on the piano.

There is a point where the velocity of the piano is such that the air resistance is equal in magnitude, but in the opposite direction, to the force of gravity.

Then the net force on the piano is zero, which means that there is no acceleration, so the piano will keep falling down at constant velocity after this point.

As a result, when Andrew is moving at a speed of 31 m/s, his momentum is 2077 kg*m/s.

Kinetic energy has the following formula: K.E. = 1/2 m v2, where m is the object's mass and v is its square velocity. The kinetic energy is measured in kilogrammes-meters squared per second squared if the mass is measured in kilogrammes and the velocity is measured in metres per second.

An object's mass (m) and velocity (v) can be multiplied to find its momentum (p), which is written as:

p = m * v

Given that Andrew's mass is 67 kg and his velocity is 31 m/s, his momentum can be calculated as:

p = 67 kg * 31 m/s

p = 2077 kg*m/s

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Question:

Andrew is riding his bike up a hill. At some point, he stops and rests at the top of the hill. He then turns around and starts riding down the hill. When he reaches a velocity of 31 m/s, calculate his momentum. Andrew's mass is 67 kg.

Answer:

In the statement of Newton's first law, the unbalanced force refers to that force that does not become completely balanced (or canceled) by the other individual forces. If either all the vertical forces (up and down) do not cancel each other and/or all horizontal forces do not cancel each other, then an unbalanced force exists. The existence of an unbalanced force for a given situation can be quickly realized by looking at the free-body diagram for that situation. Free-body diagrams for three situations are shown below. Note that the actual magnitudes of the individual forces are indicated on the diagram.

In each of the above situations, there is an unbalanced force. It is commonly said that in each situation there is a net force acting upon the object. The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out. At this point, the rules for summing vectors (such as force vectors) will be kept relatively simple. Observe the following examples of summing two forces:

Observe in the diagram above that a downward vector will provide a partial or full cancellation of an upward vector. And a leftward vector will provide a partial or full cancellation of a rightward vector. The addition of force vectors can be done in the same manner in order to determine the net force (i.e., the vector sum of all the individual forces). Consider the three situations below in which the net force is determined by summing the individual force vectors that are acting upon the objects.

The upward gravitational pull of the trunk on the earth is 1.156 x 10^3 N (or approximately 1156 N).

What is Gravitation?

Gravitation is a fundamental force of nature that describes the attraction between two masses. It is the force that causes objects to fall to the ground, keeps planets in orbit around the sun, and governs the motion of galaxies.

The upward gravitational pull of the trunk on the earth is equal in magnitude to the gravitational force that the earth exerts on the trunk. We can calculate this force using Newton's law of gravitation, which states that the force of gravity between two objects is proportional to their masses and inversely proportional to the square of the distance between them. The formula for the gravitational force between two objects is:

F = G * (m1 * m2) / r^2

where F is the force of gravity, G is the gravitational constant (6.674 x 10^-11 N*m^2/kg^2), m1 and m2 are the masses of the two objects, and r is the distance between them.

In this case, we are given the mass of the trunk (m1 = 119 kg) and we want to find the gravitational force between the trunk and the earth (m2 = mass of the earth). We can assume that the trunk is dropped from a height close to the surface of the earth, so the distance between the center of the trunk and the center of the earth is approximately equal to the radius of the earth (6.371 x 10^6 m). Substituting these values into the formula, we get:

F = (6.674 x 10^-11 N*m^2/kg^2) * (119 kg * 5.972 x 10^24 kg) / (6.371 x 10^6 m)^2

F = 1.156 x 10^3 N

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Answer:

Intensity of an earthquake (passes 1 km) = 8,748 × 10⁶

Explanation:

Given:

Distance (r1) = 54 km

Distance (r2) = 1 Km

Note:

Intensity of an earthquake with 54 km distance is 3.0 × 10⁶ J/m²s is not given.

So,

Intensity of an earthquake with 54 km distance (I₁) = 3.0 × 10⁶ J/m²s

Find:

Intensity when it passed a point only 1.0 km .

Computation:

Intensity of an earthquake = (r1 / r2)² (I₁)

Intensity of an earthquake (passes 1 km) = (54 / 1)²(3.0 × 10⁶)

Intensity of an earthquake (passes 1 km) = (54)²(3.0 × 10⁶)

Intensity of an earthquake (passes 1 km) = 8,748 × 10⁶

Answer:

  2.38 mW

Explanation:

Power is work per unit time. Work is the product of force and distance. That means ...

  \(\text{power}=\dfrac{\text{force}\times\text{distance}}{\text{time}}=\text{force}\times\dfrac{\text{distance}}{\text{time}}\\\\\text{power}=\text{force}\times\text{velocity}\)

Using the given values of force and velocity, the tadpole's power output is ...

  P = (0.028 N)(0.085 m/s) = 0.00238 W = 2.38 mW

The tadpole's power output is about 2.38 mW.

If no action is taken to address the issues evaluate whether the impact of light pollution radio interference and space debris on the field of astronomy is then a. likely to worsen

Astronomers already have a serious problem with light pollution from cities and other sources, which makes it more challenging to detect dim objects in the night sky. Light pollution is predicted to get worse unless action is taken to stop it as urbanisation grows and more artificial lights are installed.

Astronomical observations can be affected by radio interference from telecommunications, and unless steps are taken to reduce the issue, the issue is only going to become worse as the number of radio-emitting devices rises. In addition, astronomers' instruments and spacecraft are increasingly in danger from space debris. The probability of collisions and other accidents is anticipated to rise as the amount of trash in space continues to rise.

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Complete Question:

If no action is taken to address the issues evaluate whether the impact of light pollution radio interference and space debris on the field of astronomy is then -

a. likely to worsen

b. lessen or remain the same during the next 50 years

According to the information, the mass of the rock is found to be 2 kg.

Potential energy may be defined as a type of stored energy that depends upon the relative position of various parts of a system. This energy is held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.

According to the question, the potential energy is calculated with the help of the following formula:

where, P.E = 1960 J, g = 9.8 m/sec, and height = 100 m, mass = ?

mass = P.E / g × h = 1960/980 = 2 kg.

Therefore, the mass of the rock is found to be 2 kg.

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Answer:

my assuytyyhyyyyyy gftdrrdtiifyb tvhyvth rv b yy

Answer:

Explanation:

The correct option that describes a different evolutionary stage of a star like the sun is:

D) It becomes a white dwarf after exploding as a supernova

This is because a star like the sun does not have enough mass to undergo a supernova explosion. After it has exhausted all the fuel in its core, it will evolve into a red giant and then a planetary nebula, leaving behind a small, hot, dense remnant known as a white dwarf. Supernovae occur in much more massive stars that have cores that can collapse to form a neutron star or black hole.