Instructions: Do the following exercises. Remember to do ALL the steps, write the final result in Scientific Notation, if applicable and round to two decimal places. 1. Determine the minimum force needed to stop a 15.89 kg object that is accelerating at a rate of 2.5 m/s².
2. The third floor of a house is 8.0 m above the street. How much work must be done to raise a 150 kg refrigerator up to that floor? 3. How much work is done to lift a 180.0-kg box a vertical distance of 32.0 m?

Answer:

It would lift the object to the same height than before you move it 3 centimeters to the left. You see, the height doesn't change if you move the inclined plane horizontally, because height is a vertical variable.

Therefore, if the inclined plane has a height of 1 meters, then the object will be lifted 1 meters up, no matter if you move the inclined plane 50 meters horizontally, it won't change its height.

According to Jean Piaget, unrealistic idealism often occurs in adolescence as a result of egocentrism. The inability to distinguish between self and others is referred to as egocentrism.

The inability to distinguish between self and others is referred to as egocentrism. It is, more precisely, the incapacity to effectively assume or comprehend any viewpoint other than one's own.

Egocentrism may be present in every stage of life, including childhood, adolescence, and maturity.

Hence option B is correct. According to Jean Piaget, unrealistic idealism often occurs in adolescence as a result of egocentrism.

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Answer:

got it right⬇️✅

Answer:

As the world's largest, most productive, and most controversial water system, it manages over 40 million acre feet (49 km3) of water per year. Water and water rights are among the state's divisive political issues. Due to the lack of reliable dry season rainfall, water is limited in the most populous U.S. state.

A helicopter’s velocity increases from 35 m/s to 70 m/s in 10 seconds. The acceleration of this helicopter is 3.5 m/s².

The term acceleration is defined as the change in velocity as per time,  in terms of both speed and direction. Acceleration is denoted by the symbol "A".

Unbalance forces ac cause acceleration in an object. It was changing its speed, its direction, or both its speed and direction.

A = V / T

Where,

A = acceleration

V = velocity

T = time

We have given:

Velocity = 70 - 35 = 35 m/s

Time = 10 seconds

Acceleration = ?

By putting this value in given equation we can find the acceleration of this helicopter

A = 35 / 10

= 3.5 m / s²

Thus, A helicopter’s velocity increases from 35 m/s to 70 m/s in 10 seconds. The acceleration of this helicopter is 3.5 m/s².

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Answer:

b

Explanation:

The positively charged object gains 20 electrons when its charge decreases by 3.2 x 10^-18 C.

What is Positive Charge?

A positive charge is an electrical property of matter that describes the presence of more positively charged protons than negatively charged electrons in an atom or molecule. In other words, an object with a positive charge has lost one or more electrons, resulting in a net charge that is greater than zero.

We know that the charge on a single electron is 1.602 x 10^-19 C.

To calculate the number of electrons gained by a positively charged object when its charge decreases by 3.2 x 10^-18 C, we can use the formula:

number of electrons = (magnitude of charge lost) / (charge on a single electron)

number of electrons = (3.2 x 10^-18 C) / (1.602 x 10^-19 C)

number of electrons = 20

Therefore, the positively charged object gains 20 electrons when its charge decreases by 3.2 x 10^-18 C.

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The electron falls to the third energy level (n=3) after getting excited to an energy level of n=7.ii. To calculate the energy of an electron, use the formula for the energy of an electron in the excited state:En= -2.178 × 10^−18 J × (Z^2/n^2)Where En is the energy of the electron.Therefore, the set of quantum numbers for an electron in 3p orbital is {3, 1, -1, 0, 1}.

Z is the atomic number (1 for hydrogen), and n is the energy level to which the electron jumps. Plugging in the values, we get:En = -2.178 × 10^-18 J × (1^2/7^2) = -0.204 × 10^-18 J(b) i. Orbits are the path that an electron follows around the nucleus. The term orbital refers to the space around the nucleus where an electron is most likely to be found.ii. The electronic configuration of Chromium is [Ar] 3d5 4s1.

The anomalous electronic configuration of chromium arises due to the exchange of an electron from the 4s orbital to the 3d orbital to attain more stability and have a fully filled d subshell.iii. The set of quantum numbers for an electron in the 3p orbital are:n=3, l=1, ml= -1, 0, 1, ms= +1/2 or -1/2.

Chromium is an element that has anomalous electronic configuration. The anomalous configuration arises when an electron from the 4s subshell of the element is excited and moved to the 3d subshell. The ground state electronic configuration of chromium is [Ar] 3d4 4s2. The fourth electron occupies the 4s subshell. It is easier to excite the electron in the 4s subshell and move it to the 3d subshell than removing an electron from the 3d subshell.

This is because the energy required to remove an electron from the 3d subshell is high due to its closeness to the nucleus. Therefore, the configuration becomes [Ar] 3d5 4s1 to attain more stability and have a fully filled d subshell.Quantum numbers for an electron in 3p orbital:The set of quantum numbers for an electron in the 3p orbital are as follows

n = 3 (The principal quantum number which denotes the shell number)l = 1 (The azimuthal quantum number which denotes the sub-shell number and takes values from 0 to n-1)s= +1/2 or -1/2 (The spin quantum number which denotes the spin of the electron)i.e., ml= -1, 0, 1 (The magnetic quantum number which denotes the orientation of the orbitals and takes integer values from -l to +l.)

Therefore, the set of quantum numbers for an electron in 3p orbital is {3, 1, -1, 0, 1}.

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Answer:

B:0

F:1.33

Explanation:

velocity of B is 0 m/s

you can refer to the graph

acceleration of F =slope of F

4/3=1.33 m/s^2

The physical quantity whose SI unit is m/s is speed or velocity.

Hope that this was helpful :)

Work input is required in each cycle w = 208j

Here can explain as ,according to the law of conservation of energy , the total heat given off the surrounding by a refrigerator is equal to the work done by the refrigerator and the heat removed from the inside of a refrigerator .i.e. the addition of heat removed or absorbs and work done by the refrigerator is equal to the heat expelled to the room during each cycle. It can be shown as ,

\(Q_{h}\) =\(Q_{c}\) + \(W\)

Where,

 \(W\) is work input of refrigerator during each cycle.

\(Q_{c}\) is the heat removed or absorbed by the refrigerator.

\(Q_{h}\) is heat expelled to the room during each cycle.

Given here,

\(Q_{c}\) =  257 j

\(Q_{h}\) =  465 j

Therefore from above equation can be find the value of work input by the refrigerator in each cycle,

\(W\) =\(Q_{h}\) - \(Q_{c}\)

w = (465 j) -(257 j)

w= 208j

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Frozen preparations such as ice cream, sorbet, gelato, granite can be melted and refrozen, except gelato which cannot be melted and refrozen. This is because the ice cream, sorbet, and granite all contain a high content of fat which allows them to melt and refreeze successfully without becoming damaged.

However, the process of freezing the gelato forms tiny ice crystals, which provide its unique texture. If gelato is melted, it will lose its texture and will not re-freeze successfully.A gelato is a dense Italian ice cream that has a creamy texture and has a lower fat content than traditional ice cream. It is made by mixing milk, sugar, and flavorings, such as nuts or chocolate, and then churned to incorporate air into the mixture.

So, the ice cream, sorbet, and granite all contain a high content of fat which allows them to melt and refreeze successfully without becoming damaged.

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The process by which magma changes form through the rock cycle to become magma again eventually is described in the following steps:

The rock cycle refers to the process by which the three main types of rocks—igneous, metamorphic, and sedimentary—are formed and decomposed according to various applications of heat and pressure over time.

For instance, when heat and pressure are applied to sedimentary rock shale, slate is formed.

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Answer:

4 Joules (if you mean 2000 grams)

4000 Joules (if you mean 2000 kilograms)

Explanation:

Answer:

d. 0.48

Explanation:

Answer:

Nuclear power is presently a sustainable energy source, but could become completely renewable if the source of uranium changed from mined ore to seawater. Since U extracted is continuously replenished through geologic processes, nuclear would become as endless as solar.

Answer:

The average velocity is 7.5 km/h

Explanation:

Were Gonna convert minutes to hours

12 minutes = 12/60  hours = 0.2 hours

Now we estimate the average velocity of the distance traveled over this time

1.5 / 0.2 km/h = 7.5 km/h

The observed effect is strongest in Region B due to its unique geographical characteristics. Region B exhibits a distinct pattern of high intensity and concentration of the observed effect compared to other regions in the figure. This can be attributed to several factors that contribute to the strength of the effect.

Firstly, Region B is characterized by its proximity to a major geographic feature, such as a mountain range or a large body of water. These features can significantly influence weather patterns and atmospheric conditions in the region. In the case of Region B, the presence of a nearby mountain range acts as a barrier, forcing air masses to rise and creating localized weather phenomena. This elevation change leads to variations in temperature, humidity, and wind patterns, which amplify the observed effect.

Secondly, the geographical location of Region B plays a crucial role. It is situated in a region where multiple air masses converge, resulting in the formation of atmospheric disturbances. This convergence leads to a collision of different weather systems, causing an intensification of the observed effect. Additionally, the positioning of Region B within the larger atmospheric circulation patterns, such as prevailing wind directions or jet streams, can further enhance the strength of the effect.

Furthermore, the local topography of Region B contributes to the amplification of the observed effect. The presence of valleys, slopes, or other geographical features can create microclimates within the region. These microclimates can trap air masses, moisture, or pollutants, leading to heightened concentrations and greater impact of the observed effect.

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This statement is True that the pressure in the mesosphere is so low that a person will not be able to sustain in this layer without a spacesuit.

The mesosphere may be defined as the region in the earth's atmosphere which lies above the stratosphere and below the thermosphere. It has a very low temperature and pressure. The top of the mesosphere is the coldest part of Earth's atmosphere.

This layer is the highest layer of the Earth's atmosphere wherein all the gases of the atmosphere get mixed up rather than being layered in the atmosphere according to their masses. The pressure in the Mesosphere is very low the reason that it is very highly situated, and all the amount of air mass lies below this layer.

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The sandbag will hit the ground with a velocity of -48 feet per second (negative sign indicates the downward direction).

(a) To determine the time it takes for the sandbag to strike the ground, we can use the equation:

h(t) = h₀ + v₀t + 0.5at²

where h(t) is the height at time t, h₀ is the initial height (64 feet), v₀ is the initial velocity (16 ft/s), a is the acceleration (-32 ft/s²), and t is the time in seconds. We want to find the time t when h(t) = 0 (when the bag hits the ground).

0 = 64 + 16t - 16t²
0 = 64 - 16t²

Now, we solve for t:

t² = 4
t = 2 seconds

The sandbag will strike the ground 2 seconds after its release.

(b) To find the velocity at which the bag hits the ground, we use the equation:

v(t) = v₀ + at

where v(t) is the velocity at time t, v₀ is the initial velocity (16 ft/s), a is the acceleration (-32 ft/s²), and t is the time in seconds.

v(2) = 16 - 32(2)
v(2) = 16 - 64
v(2) = -48 ft/s

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sis i love the eren season 1-2-3-4 but the eren season 5?....... i just :')

Answer:

Explanation:

Aaron yogurt supremacy

Let's explain why Common Emitter (CE) configuration is preferred over Common Collector (CC) for amplification purposes.

Common Emitter amplifier is an amplifier that offers high current gain, medium input resistance and high output resistance.

Common Collector is another type of amplifier where the input signal is applied to the base and the ouput signal is taken from the emitter.

The Common Emitter configuration is preferred over the Common Collector configuration because the Common Emitter offers a high power gain(high voltage and current gain), and has a lower resistance when compared to the Common Collector configuration.

ANSWER:

The common Emitter configuration has higher voltage and current gain when compared to the Common Collector configuration.

Strong nuclear force: QED does not include the strong nuclear force, which is responsible for the interaction between protons and neutrons in the nucleus of an atom.

Gravity: QED does not include gravity, which is the weakest of the four fundamental forces.

Quantum gravity: Quantum gravity is a proposed theory that attempts to unify quantum mechanics and general relativity. QED does not include quantum gravity, as it is still a work in progress.

Strong nuclear force: The strong nuclear force is a short-range force that is responsible for the interaction between protons and neutrons in the nucleus of an atom.

It is much stronger than the electromagnetic force, but it only acts over very short distances. QED does not include the strong nuclear force, as it is a theory of electromagnetism.

Gravity: Gravity is the weakest of the four fundamental forces, but it is also the most long-range. It is responsible for the attraction between all objects with mass. QED does not include gravity, as it is a theory of electromagnetism.

Quantum gravity: Quantum gravity is a proposed theory that attempts to unify quantum mechanics and general relativity. Quantum mechanics is the theory of the very small, while general relativity is the theory of gravity. QED does not include quantum gravity, as it is still a work in progress.

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Answer:

zip zap ballz

Explanation:

The acceleration of the hamster can be found using the equation:
a = (vf - vi)/t
where vf is the final velocity (5.0 m/s), vi is the initial velocity (0 m/s since the hamster starts from rest), and t is the time taken to reach the final velocity (1.6 s).a = (5.0 m/s - 0 m/s)/1.6 s
a = 3.13 m/s^2
Therefore, the acceleration of the hamster when it increases its velocity from rest to 5.0 m/s in 1.6 s is 3.13 m/s^2 (to two significant figures).

To find the acceleration of the hamster, we can use the formula:
a = (v_f - v_i) / t
where a is the acceleration, v_f is the final velocity (5.0 m/s), v_i is the initial velocity (0 m/s, as the hamster starts from rest), and t is the time (1.6 s). Plugging in the values, we get:
a = (5.0 m/s - 0 m/s) / 1.6 s
a = 5.0 m/s / 1.6 s
a ≈ 3.1 m/s²

So, the acceleration of the hamster is approximately 3.1 m/s² (to two significant figures), with the appropriate unit being meters per second squared.

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The reason why the action potential is self regenerating is explained below .

What is Action Potential ?

The term Action Potential is defined as a rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane with a characteristic pattern .

We have to explain why the action potential is self - regenerating .

So , the action potential is self regenerating because the depolarizing currents established by the influx of Na⁺  flow down axon and trigger an action potential at next segment .

Therefore, the reason for the self regenerating action - potential is explained .

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Answer:

Heat is released.

Explanation:

Freezing is almost always an exothermic process, meaning that as liquid changes into solid, heat and pressure are released. This is often seen as counter-intuitive, since the temperature of the material does not rise during freezing, except if the liquid were supercooled.

The frequency of the sound heard by the driver of the Porsche is 689.39 Hz and 614.8 Hz.

In physics, frequency is the number of waves that pass a fixed point in a unit of time as well as the number of cycles or vibrations that a body in periodic motion experiences in a unit of time.

(a) as when a person is in front of the car:

f' = (350 - 0/350 - 20) x f = 350/330 x 650 = 689.39 Hz

(b) when a person is behind the car (source is moving away):

f'' = (350 - 0/350 + 20) x f° = 350/370 x 650 = 614.8 Hz

V(source) = 72 km/h = 20 m/s

V(sound) = 350 m/s

f° = 650 Hz

Hence, the frequency of the sound heard by the driver of the Porsche is 689.39 Hz and 614.8 Hz.

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In the system of stream orders, the smallest unit in the network is at the 1st order.

Stream orders are a way of classifying streams and rivers based on their position within a drainage network. The smallest unit in the network, also known as headwater streams, are classified as 1st order streams. These are the smallest tributaries that have no other streams flowing into them. As streams merge, the order increases. When two 1st order streams join, they form a 2nd order stream. When two 2nd order streams join, they form a 3rd order stream, and so on. However, if a lower-order stream joins a higher-order stream, the order of the higher stream remains the same. For example, if a 1st order stream joins a 3rd order stream, the resulting stream remains a 3rd order stream. This classification system helps scientists, hydrologists, and environmental managers better understand and manage river systems and their ecological impacts.

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