A well fed squirrel (mass of 1. 2 kg) does push-ups by applying a force to elevate its center-of-mass by 5 cm. Calculate the number of push-ups that the squirrel must do in order to do 18. 0 Joules of work. Hints: The formula requires a Force. The formula to calculate weight (aka your downward force) is w=mg. Use 10. 0 for g. The formula requires displacement in "meters". Convert (cm) to (m). If the squirrel does a total of 18. 0 Joules of work, then it must have done _ push-ups. ​

Answer:

running a mile in six minutes

Explanation:

Answer:

Not example is B: Running a mile in six minutes

Gravity causes cast of gases to clump together to begin forming new stars and planets.

Gravity binds the gas and dust together. If the cluster is large enough, it produces a star—increased pressure from gravitational collapse boosts the temperature, forcing nuclear fusion to occur in its center.

The dust and gases in a nebula are widely dispersed, yet gravity can gradually bring clumps of dust and gas together. As these clusters grow in size, their gravity grows stronger and stronger. The clump of dust and gas eventually becomes so large that it collapses due to its own gravity.

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We cannot determine the speed at which a star in the galaxy is moving away from us based on its mass, luminosity, age, or color alone. it is false

The speed at which a star in the galaxy is moving away from us is determined through the measurement of its spectrum using a technique known as redshift.

When a star or galaxy moves away from us, its light is shifted towards longer wavelengths, resulting in a redshift. By analyzing the degree of redshift, astronomers can estimate the speed at which the star is receding.

However, factors such as mass, luminosity, age, and color do not provide direct information about the star's motion away from us.

These characteristics are important for studying other properties of stars, such as their composition, brightness, evolutionary stage, and temperature. To determine the motion of a star in the galaxy, redshift measurements are essential.

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By using uniform motion, the speed before hitting the ground is 23.00 m/s.

We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule

vt = vo + a . t

vt² = vo² + 2a . s

s = vo . t + 1/2 . a . t²

where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.

From the question above, we know that

vo = 0 m/s

t = 1.45 s

y = 27 m

g = 9.8 m/s²

By using the second equation, we can calculate the speed before hit the ground.

vt² = vo² + 2a . s

vt² = 0² + 2g . 27

vt² = 2 . 9.8 . 27

vt² = 529.2

vt = 23.00 m/s

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Answer:

250 - 35e = 215e

150 - 35e = 115e

Explanation:

I did it mentally

The magnitude of the electrostatic force is \(1.8 * 10^-^1\) N, which is equivalent to 0.18 N.

Option C is correct.

The electrostatic force is described as an attractive as well as repulsive force caused by the electric charge particles.

Electrostatic force  F_= k * |q1 * q2| / r²

F_ =  electrostatic force

k =  electrostatic constant

q1 = \(+3.0 * 10^-^5 C,\)

and q2 = \(+6.0 * 10^-^6 C\) (magnitudes of the charges)

r =  distance between the charges = 0.30 m

F_ = (\(9 * 10^9\)) * |(\(+3.0 * 10^-^5 C\)) * (\(+6.0 * 10^-^6 C\))| / (0.30 m)²

F_ =\(1.8 * 10^-^1 N\)

In conclusion, the magnitude of the electrostatic force is \(1.8 * 10^-^1\) N.

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The two errors in the passage are:

pH is a measure of the concentration of OH− ions in a solution of an acid or base. The pH scale plots the concentration of solutions in a range from 0–16.

The answer that correct both errors is:

pH is a measure of the concentration of H+ ions in a solution of an acid or base. The pH plots the concentration of solutions in a range from 0–14.

A solution's acidity or basicity is determined using the pH scale. A pH of 0-6.9 is considered acidic, a pH of 7 is neutral, and a pH of 7.1-14 is considered basic. The pH scale is logarithmic, which means that each change in pH reflects a tenfold difference in acidity or basicity.

The concentration of hydrogen ions (H+) in a solution determines the pH of the solution. A base is a chemical that reduces the concentration of H+ ions in a solution, whereas an acid raises the concentration of H+ ions in a solution.

Therefore, The  correct answer choice is:

" pH is a measure of the concentration of H+ ions in a solution of an acid or base. The pH plots the concentration of solutions in a range from 0–14."

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The wavelength associated with the particle of mass 1 mg and velocity

1 km/s is 6.63 x \(10^{-31}\) m.

We have a particle moving with certain velocity.

We have to calculate the wavelength associated with the particle.

According to de - Broglie, the wavelength of the wave associated with the moving particle is -

λ = h/mv

Where -

h -  Planck's constant

mv - Momentum of particle

According to the question -

Mass = 1 mg =  10⁻⁶ Kg

velocity = 1 Km/s = 1000 m/s

Using the formula for de - Broglie wavelength discussed above -

Momentum = mv = 10⁻⁶ x 10³ = 10⁻³ Kg m/s

now -

λ = h/10⁻³ = 6.63 x 10⁻³⁴/10⁻³ = 6.63 x 10⁻³¹ m

Hence, the wavelength associated with the particle is 6.63 x 10⁻³¹  m.

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Answer:

jumping, pulling a elastic band, bouncing a ball

Explanation:

when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air.

When we pull an elastic band, it automatically returns to its original position. The more you pull the more force it generates. This is the same when you pull or compress a spring. The action (applied force) is stored as energy and is released as a reaction with an equal and opposite force

A ball is able to bounce because of the reaction from the ground. If there was no reaction then the ball would not bounce but rather stick to the ground.

Strong x-ray beams can be produced when cathode rays strike a metal anode.

This process is known as the production of bremsstrahlung radiation. When high-speed electrons, also called cathode rays, are accelerated and then collide with a metal target, they are abruptly decelerated, and the kinetic energy lost is converted into X-ray photons.

The resulting X-ray beam produced can be strong and intense, and its properties depend on the energy of the incident electrons and the material of the target.

Gamma rays moving through a magnetic field, alpha rays passing through a thin metal foil, or beta rays being absorbed by bones do not directly produce strong X-ray beams.

In summary, the correct answer is A) cathode rays striking a metal anode can produce strong X-ray beams.

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Answer:noo

Explanation:impossible

The periodic table we can find that correct statements are:

   b)  It is nonmetal that does not conduct electricity well  

   d) It is very unreactive

The periodic table is a method developed to group chemical elements based on their atomic number allowing to visualize many similarities between different chemical elements.

The peridot table is divided:

The properties of the elements in a column (group) are similar, for example group 8 (VIIIA) called noble gases has 8 electrons in its last shell, which is why it is full, which implies that they are non-reactive and because the electrons are not full. they can move before electrical fields therefore their electrical conductivity in small.

Let's analyze the different affirmations in scares that Argon is an element of group 8,  it  is a noble gas

a) False. The last layer is full, so it is non-reactive

b) True. As the last cap is full and the inner layers too, the electrons cannot move, so the electrical conductivity is very low.

c) False. It is a non-metal and does not conduct electricity

d) True. As the last layer is full, the reactivity is very small.

Conclusion with the use of the periodic table we can find the correct statements are:

   b)  It is nonmetal that does not conduct electricity well  

   d) It is very unreactive

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We can combine the given resistors by connecting the 3 Ω and 4 Ω resistors in series, connecting this combination in parallel with the 5 Ω and 6 Ω resistors, and then connecting the resulting combination with the 3 Ω and 4 Ω resistors in series again to achieve a 2 Ω equivalent resistance.

To make a 2 Ω resistor using these four resistors, we need to combine them in a specific way. The simplest way to achieve this is by connecting them in series and parallel combinations. We can begin by combining two resistors in series and then connect them in parallel with the other two resistors.

Let's take the 3 Ω and 4 Ω resistors and connect them in series. The total resistance of these two resistors in series is 3 + 4 = 7 Ω. Now, let's connect this combination of resistors in parallel with the remaining two resistors, 5 Ω and 6 Ω.

To combine the 7 Ω resistor and the 5 Ω resistor in parallel, we can use the formula: 1/RT = 1/R1 + 1/R2. Substituting the values, we get:

1/RT = 1/7 + 1/5
1/RT = (5 + 7)/35
1/RT = 12/35
RT = 35/12

Now, we can connect this parallel combination of resistors with the 6 Ω resistor in series.

To combine the 35/12 Ω resistor and the 6 Ω resistor in series, we simply add them:

35/12 + 6 = 77/12 Ω

This is the total resistance of the circuit. To find the equivalent resistance, we need to connect the remaining two resistors, 3 Ω and 4 Ω, in series with this combination.

3 + 4 + 77/12 = 47/4 Ω

This is the equivalent resistance of the circuit. We can see that it is approximately equal to 2 Ω, which is what we wanted to achieve.

Therefore, we can combine the given resistors by connecting the 3 Ω and 4 Ω resistors in series, connecting this combination in parallel with the 5 Ω and 6 Ω resistors, and then connecting the resulting combination with the 3 Ω and 4 Ω resistors in series again to achieve a 2 Ω equivalent resistance.

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The order of events when a neuron fires an action potential is as follows:

1. Depolarization: The neuron's membrane potential is changed from its resting potential to a more positive voltage.

2. Threshold: The membrane potential reaches a critical level, known as the threshold potential, which triggers the action potential.

3. Action potential: An all-or-none electrical impulse is generated and propagates along the axon.

4. Repolarization: The membrane potential returns to its resting potential.

Answer:

D=m/v

Explanation:

1.37kg/1.3899m cube

0.9927kg meter cube

The moment of inertia of a 5.00 kg sphere of radius 0.741 m when the axis of rotation is through its center is 0.777 kg·m².

The moment of inertia of an object is a measure of its resistance to rotational motion around a given axis. For a solid sphere rotating around an axis through its center, the moment of inertia can be calculated using the formula I = (2/5) * m * r², where I is the moment of inertia, m is the mass of the sphere, and r is the radius of the sphere.

Applying the given values, we have I = (2/5) * 5.00 kg * (0.741 m)². Simplifying the equation yields I = 0.777 kg·m².

This means that when the sphere rotates around an axis passing through its center, it has a moment of inertia of 0.777 kg·m². The moment of inertia quantifies how the mass is distributed around the axis of rotation, and a larger moment of inertia indicates greater resistance to changes in rotational motion.

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The distance the truck travel in given time is 216 m and the final velocity of acceleration at 0.5m/\(s^{2}\) for 30 seconds is 19 m /s

The following question has two parts

For part 1 we need to calculate the distance covered by the truck in 12 seconds

We know that

 s = ut + \(\frac{1}{2}a .t^{2}\) . . . . . . .  . . . . .(1)

where s = distance travelled

           u = initial velocity

           a = acceleration

           t  =  time in seconds

Now , As per the question

u = 6 m/s

a = 2 m/\(s^{2}\)

t  = 12 seconds

Putting the values in the equation (1)

                          s = 6 X 12 + \(\frac{1}{2}\) X 2 X 144

                          s = 72 + 144

                          s = 216 m

Therefore the distance travelled is 216 m

For part 2 we need to calculate the final velocity that Paco was driving

We know that

v = u + at . . . . . . . . . . .  .(2)

where v = final velocity

          u = initial velocity

          a = acceleration

           t = time in seconds

As per the question,

u = 4m/s

a = 0.5 m/\(s^{2}\)

t = 30 seconds

Putting in equation (2)

                                      v = 4 + 0.5 X 30

                                      v  =  4 + 15

                                      v = 19 m/s

Therefore the final velocity is 19 m/s

Therefore , the distance the truck travel in given time is 216 m and the final velocity of acceleration at 0.5m/\(s^{2}\) for 30 seconds is 19 m /s

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The final velocity of the scooter is 19 m/s.

Given:

Initial velocity of truck, u = 6 m/s

Acceleration of truck, a = 2 m/s²

Time taken by the truck, t = 12 s

Formula used:

s = ut + 1/2 at²

Where,

s = Distance travelled

u = Initial velocity

a = Acceleration

t = Time taken

Substituting the given values in the above formula, we get:

s = ut + 1/2 at²

 = 6(12) + 1/2 × 2 × (12)²

 = 72 + 1/2 × 2 × 144

 = 72 + 144

 = 216 m

Therefore, the truck travels 216 m in the given time.

Given:

Initial velocity of scooter, u = 4 m/s

Acceleration of scooter, a = 0.5 m/s²

Time taken by the scooter, t = 30 s

Formula used:

v = u + at

Where,

v = Final velocity

u = Initial velocity

a = Acceleration

t = Time taken

Substituting the given values in the above formula, we get:

v = u + at

 = 4 + 0.5 × 30

 = 4 + 15

 = 19 m/s

Therefore, the final velocity of the scooter is 19 m/s.

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A full tip jar on the counter makes use of the principle of social proof, also known as the principle of consensus or conformity.

The principle of social proof is a psychological phenomenon that suggests people are more likely to adopt a certain behavior or belief when they see others doing the same. Having a full tip jar on the counter, creates the perception that many other people have already contributed, thereby influencing individuals to follow suit and leave a tip as well.

The presence of a full tip jar serves as visual evidence of social consensus, indicating that tipping is the norm in that particular context. It creates a sense of conformity, where individuals are influenced by the actions of others and feel compelled to conform to the behavior displayed by the majority.

Furthermore, a full tip jar can also trigger the fear of missing out (FOMO) effect. When individuals observe a jar filled with tips, they may experience a fear of being left out or appearing stingy if they don't contribute, leading them to conform and leave a tip.

Overall, the principle of social proof, along with the fear of missing out, is at play when a full tip jar is used to persuade customers to leave tips by leveraging the power of social influence and conformity.

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Answer:

304 K

Explanation:

The word "water cycle" refers to the ongoing process that transfers water from the earth to a atmosphere and back.

The hydrologic cycle, another name for the water cycle, describes where and how water is kept on Earth.

Thus, the term "water cycle" refers to the ongoing process that transfers water from the earth to a atmosphere and back.

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The binding energy of the metal is \(1.06 * 10^{-19\)J.  

The binding energy of a metal is the energy required to remove an electron from the metal. To determine the binding energy of the metal, we need to know the work function of the metal, which is the energy required to remove an electron from the surface of the metal.

The work function is typically expressed in units of electron volts (eV). For this particular metal, the maximum kinetic energy of the ejected electrons is 32 eV, so the work function can be calculated as follows:

Work function = maximum kinetic energy - binding energy

Work function = 32 eV - binding energy

To find the binding energy of the metal, we need to know the wavelength of the UV light used to eject the electrons. The binding energy of an electron is inversely proportional to its kinetic energy, so we can rearrange the equation to solve for the binding energy as follows: Binding energy = maximum kinetic energy / wavelength

We can then use the formula for the energy of a photon (photon energy = h / c, where h is Planck's constant, f is the frequency of the photon, and c is the speed of light) to calculate the wavelength of the UV light used:

wavelength = h / (c x maximum kinetic energy)

Binding energy = (h / c) / (32 eV / (c x 27.6 nm))

Binding energy =  \(1.06 * 10^{-19\)J.  

Therefore, the binding energy of the metal is \(1.06 * 10^{-19\)J.  

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This equation describes the change in kinetic energy of the block due to the force exerted on it as it moves a horizontal distance Δx.

Kinetic energy is the energy an object has due to its motion. It is the energy that an object has because of its mass and velocity. Kinetic energy is measured in joules (J). Kinetic energy increases as the mass of the object increases and as the velocity of the object increases. For example, a car moving at 30 miles per hour has more kinetic energy than a car moving at 10 miles per hour.

The change in kinetic energy of the block can be calculated using the following equation:
ΔKE = (1/2)Mv2f - (1/2)Mv2i
Where M is the mass of the block, v2f is the final speed of the block, and v2i is the initial speed of the block.
To calculate the final speed of the block, we can use the equation below.
v2f = v2i + (2FAcosθΔx / M)
Where FA is the magnitude of the force, θ is the angle of the force, and Δx is the horizontal displacement of the block.
Using this equation and the equation for the change in kinetic energy, we can derive an equation for the change in the block’s kinetic energy as it moves a horizontal distance Δx.
ΔKE = (1/2)M[v2i+(2FAcosθΔx/M)]2 - (1/2)Mv2i
This equation can be simplified to:
ΔKE = (FAcosθΔx)v2i + (FAcosθΔx)2/2M
This equation describes the change in kinetic energy of the block due to the force exerted on it as it moves a horizontal distance Δx. The first term of this equation represents the increase in kinetic energy due to the increase in speed, while the second term represents the increase in kinetic energy due to the work done by the force.

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Snell's law depends not only on the refractive indexes of the materials but also on the "angle of incidence" and "angle of refraction" of the light rays.

Snell's law describes the relationship between the angles of incidence and refraction when light passes through the interface between two different materials. It states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the refractive indexes of the two materials.

Mathematically, Snell's law is expressed as:

n₁ * sin(θ₁) = n₂ * sin(θ₂),

where n₁ and n₂ are the refractive indexes of the first and second materials, respectively, and θ₁ and θ₂ are the angles of incidence and refraction, respectively.

Therefore, the accurate determination of the angles of incidence and refraction is crucial for applying Snell's law to analyze the behavior of light as it passes through different media.

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Answer:

velocity = 29.4 m/s

Explanation:

We have been told to calculate the velocity of a ball after 3 seconds of freefall. To do this, we can use the following formula:

\(\boxed{v = u + at}\),

where:

• v = final velocity

• u = initial velocity

• a = acceleration

• t = time of freefall

In this case, u = 0 m/s, because the ball is initially stationary before it is released. Also, a = 9.81 m/s² because the ball is falling while inside the Earth, where the acceleration of freefall is 9.81 m/s².

Using the above information along with the formula, we can calculate the velocity of the ball after 3 seconds of freefall:

v = 0 m/s + (9.81 m/s² × 3 s)

  = 29.4 m/s

If you start with 1,000 grams of erbium-165, the time it  will take to have 125 grams of erbium-165 left in the sample is 20.8 hours.

option D is the correct answer.

Half life is the time that it takes for half of the original value of some amount of a radioactive element to decay.

If you start with 1,000 grams of erbium-165, the time it  will take to have 125 grams of erbium-165 left in the sample is calculated as follows;

1,000 ---------- 0 time

500 ----------- 10.4 hours

125 ------------- 20.8 hours

Thus, from the calculation done above, we can see that If you start with 1,000 grams of erbium-165, the time it  will take to have 125 grams of erbium-165 left in the sample is 20.8 hours.

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1. If the plug is moved from one position to another, the frequency of the standing wave remains constant.

2. If the plug is moved to a position where the distance between nodes or antinodes decreases, the wavelength of the standing wave will decrease.

3. The wave speed of the standing wave will remain constant regardless of the position of the plug.

As the plug is moved from one position to another in a system where a standing wave is formed, several changes occur in the standing wave frequency, wavelength, and wave speed:

1. Standing wave frequency: The frequency of a standing wave is determined by the vibration frequency of the source that creates the wave. Therefore, if the plug is moved from one position to another, the frequency of the standing wave remains constant as long as the source frequency remains the same. The movement of the plug does not directly affect the frequency of the standing wave.

2. Standing wave wavelength: The wavelength of a standing wave is determined by the distance between two consecutive nodes or antinodes. When the plug is moved, the position of nodes and antinodes may change, affecting the wavelength of the standing wave. If the plug is moved to a position where the distance between nodes or antinodes increases, the wavelength of the standing wave will also increase. Conversely, if the plug is moved to a position where the distance between nodes or antinodes decreases, the wavelength of the standing wave will decrease.

3. Wave speed: In a medium, the wave speed is determined by the properties of the medium, such as its density and elasticity. The movement of the plug does not directly change the properties of the medium, so it does not affect the wave speed. As long as the medium remains the same, the wave speed of the standing wave will remain constant regardless of the position of the plug.

It's important to note that the specific changes in the standing wave frequency, wavelength, and wave speed will depend on the details of the system and the nature of the wave being generated.

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Answer:

Efficiency = 10.2 %

Explanation:

Given the following data;

Mass = 70 kg

Height = 50 m

Velocity = 10 m/s

We know that acceleration due to gravity is equal to 9.8 m/s².

To find the efficiency of energy conversion from potential to kinetic;

First of all, we would determine the potential energy;

P.E = mgh

P.E = 70 * 9.8 * 50

P.E = 34300 J

For the kinetic energy;

K.E = ½mv²

K.E = ½ * 70 * 10²

K.E = 35 * 100

K.E = 3500

Therefore, Input energy, I = 34300 J

Output energy, O = 3500 J

Next, we find the efficiency;

Efficiency = O/I * 100

Substituting into the formula, we have;

Efficiency = 3500/34300 * 100

Efficiency = 0.1020 * 100

Efficiency = 10.2 %

To make 4 amperes flow through a resistance of 20 ohms, 80 volts of voltage are required.

Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. In other words, the greater the voltage, the greater the current that flows through a given resistance.

The voltage required to make 4 amperes flow through a resistance of 20 ohms can be calculated using Ohm's law:

Voltage (V) = Current (I) x Resistance (R)

Therefore, V = 4 A x 20 Ω = 80 V

So, to make 4 amps flow through a resistance of 20 ohms, 80 volts of electricity are required.

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