A
person shoves an ice cube off a table. Which of the following acts on the ice cube after it leave
the table but before it hits the floor?

Answer:

Contour lines (thinner lines) between index contours are called intermediate contour lines. In the map shown below, the elevation difference between index lines is 100 meters. The elevation difference or vertical distance between two adjacent contour lines would be 20 meters (100 : 5 = 20).

Explanation:

I think so not sure srry if wrong

Answer:

ummm what grade is this????

Explanation:

Answer:

When the sun shines onto a solar panel, energy from the sunlight is absorbed by the PV cells in the panel. This energy creates electrical charges that move in response to an internal electrical field in the cell, causing electricity to flow.

Answer:

When the sun shines onto a solar panel, energy from the sunlight is absorbed by the PV cells in the panel. This energy creates electrical charges that move in response to an internal electrical field in the cell, causing electricity to flow.

Explanation:

Answer:

the molecules form new chemical bonds

Explanation:

The circumstance which will not occur when water undergoes a physical change is that the molecules form new chemical bonds. Thus, the correct option for this question is B.

Physical change may be defined as a type of change within the compound or things that significantly do not change the chemical properties of the matter. It usually involves the process of transition from one state to another.

When water undergoes a physical change means liquid to solid, solid to liquid, or gas, the motion of the molecules, kinetic energy, and density alter with respect to the state of matter. So, all these attributes are classified into the category of physical change.

Therefore, the molecules forming new chemical bonds is the option that will not occur at any point in time when water undergoes a physical change. Thus, the correct option for this question is B.

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Answer:

Fast rotation

Slow revolution

Explanation:

Solar system has 8 planets. 4 inner rocky planets - Mercury, Venus, Earth and Mars and 4 outer gaseous planets - Jupiter, Saturn, Uranus and Neptune.  The outer planets have few common features.

They are gaseous. There  period of revolution is larger than the inner planets which means that they have slow revolution about the Sun. One day on the outer planets is smaller than the inner planets which means they have fast rotation.

For example, Jupiter has revolves around sun in 11.86 Earth years and rotates about axis in 9.8 Earth hours. Uranus revolves around sun in 84 Earth years and rotates on its axis 17.9 Earth hours.

Answer:

Fast rotation

Slow revolution

Explanation:

did the test

Answer:

The equivalent resistance of the combination is R/100

Explanation:

Parallel Connection of Resistances

If resistances R1, R2, R3,...., Rn are connected in parallel, the equivalent resistance is calculated as follows:

\(\displaystyle \frac{1}{R_e}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}+...+\frac{1}{R_n}\)

The electric resistance of a wire is directly proportional to its length. If a wire of resistance R is cut into 10 equal parts, then each part has a resistance of R/10.

It's known the 10 parts or resistance R/10 were connected in parallel, thus the electric resistance is:

\(\displaystyle \frac{1}{R_e}=\frac{1}{R/10}+\frac{1}{R/10}+\frac{1}{R/10}+...+\frac{1}{R/10}\)

Note the sum consists of 10 equal terms. Operating on each term:

\(\displaystyle \frac{1}{R_e}=\frac{10}{R}+\frac{10}{R}+\frac{10}{R}+...+\frac{10}{R}\)

The sum of 10 identical fractions yields 10 times each fraction:

\(\displaystyle \frac{1}{R_e}=10\frac{10}{R}=\frac{100}{R}\)

Solving for Re needs to take the reciprocal of both sides of the equation:

\(R_e=R/100\)

The equivalent resistance of the combination is R/100

The positive feedbacks without uncertainty are water vapor feedback. The feedbacks that affect the terrestrial radiation budget are lapse rate feedback, ice-albedo feedback, water vapor feedback, and cloud feedback.

Among the feedbacks listed, the ones that are definitely positive (without uncertainty) are: 1. Water vapor feedback: An increase in temperature leads to an increase in atmospheric water vapor content, which amplifies the greenhouse effect and further enhances warming. This feedback is positive. The feedbacks that affect the terrestrial radiation budget (the balance of incoming and outgoing radiation at the Earth's surface) are: 1. Lapse rate feedback: This feedback is related to the vertical temperature profile of the atmosphere. If the lapse rate (the rate at which temperature changes with altitude) decreases with warming, it can amplify the warming or cooling effects. It affects the radiation budget indirectly by influencing the atmospheric temperature structure. 2. Ice-albedo feedback: When temperatures rise, ice and snow cover decrease, exposing darker surfaces (such as land or ocean) that absorb more solar radiation. This leads to further warming, creating a positive feedback loop that affects the radiation budget. 3. Water vapor feedback: As mentioned earlier, an increase in temperature leads to increased atmospheric water vapor content. Water vapor is a potent greenhouse gas that affects the radiation budget by trapping outgoing longwave radiation and amplifying the greenhouse effect.b4. Cloud feedback: Changes in temperature and atmospheric moisture content can affect cloud formation and properties. Clouds can either trap heat (positive feedback) or reflect sunlight back to space (negative feedback), depending on their type, altitude, and coverage. The net effect of cloud feedback on the terrestrial radiation budget depends on the specific cloud changes in response to warming.

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We expect the last colour of the sunset to be on the red end of the visible spectrum because of the dispersion of light.  Due to the particles present in the atmosphere, the light rays undergo scattering and the light of shorter wavelengths like blue gets dissipated but light rays of longer wavelengths travel long distances without getting dissipated.

Dispersion of light is the phenomenon in which the light from the sun is split into its constituent colours which are Violet, Indigo, Blue, Green, Yellow, Orange, and Red when it passes through a prism or due to the particles present in the earth's atmosphere.  

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These striped patterns reveal the progression of seafloor spreading. From the magnetic anomalies they detect with a magnetometer, geophysicists can deduce these patterns. The rate of spreading has been quicker where the magnetic wiggles or anomalies are wider.

The paper strips stand in for the marine crust or bottom. 3. On both sides, the sections that are farthest from the middle should be the oldest sections. 4. The development of a new oceanic crust or seabed is known as seafloor spreading. 5. Stripes of symmetrically polarized rocks are seen around the mid-ocean ridge axis. From rocks closest to ridge crests to boulders farthest from ridges, the age of seafloor rocks increases.

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Answer:

option 3, as circuit breakers are mostly used as precautions

The Alberts' total acceleration will be +0.5 m/s².The total acceleration is the algebraic sum of all the acceleration.

The rate of change of velocity with respect to time is known as acceleration. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.

The total acceleration is the algebraic sum of all the acceleration.

When Albert is jumped toward the elevator the net acceleration is acting downward taken as a negative and the elevator is accelerating upwards the acceleration is taken as positive.

The total acceleration is found as;

\(\rm a_{net}= +1.5 m/s^2-1.0 \ m/s^2 \\\\ a_{net}=+0.5 \ m/s^2\)

Hence, the Alberts' total acceleration will be +0.5 m/s².

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The volume at 35°C is approximately 69.86 liters

The solution to the problem: "A mass of gasoline occupies 70.01 at 20°C.  the volume at 35°C" is given below:Given,M1= 70.01; T1 = 20°C; T2 = 35°CVolume is given by the formula, V = \frac{m}{ρ}

Volume is directly proportional to mass when density is constant. When the mass of the substance is constant, the volume is proportional to the density. As a result, the formula for calculating density is ρ= \frac{m}{V}.Using the formula of density, let's find out the volume of the gasoline.ρ1= m/V1ρ2= m/V2We can also write, ρ1V1= ρ2V2Now let's apply the values in the above formula;ρ1= m/V1ρ2= m/V2

ρ1V1= \frac{ρ2V2M1}{ V1}  = ρ1 (1+ α (T2 - T1)) V1V2 = V1 / (1+ α (T2 - T1)) Given, M1 = 70.01; T1 = 20°C; T2 = 35°C

Therefore, V2 = \frac{V1 }{(1+ α (T2 - T1))V2}=\frac{ 70.01}{(1 + 0.00095 * 15) } [α for gasoline is 0.00095 per degree Celsius]V2 = 69.86 liters (approx)

Hence, the volume at 35°C is approximately 69.86 liters.

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Well that happens to me all the time.

Answer:

468.42572 Wavelength In Metres

Explanation:

Answer:

\(\huge\boxed{\sf Wavelength= 470\ m}\)

Explanation:

Given Data:

Speed of light = c = 3 × 10⁸ m/s (Constant)

Frequency = f = 640 kHz = 6.4 × 10² × 10³ Hz = 6.4 × 10⁵ Hz

Required:

Wavelength = λ = ?

Formula:

λ = c / f

Solution:

λ = 3 × 10⁸ / 6.4 × 10⁵

λ = 0.47 × 10³

λ = 4.7 × 10² m

λ = 470 m

\(\rule[225]{225}{2}\)

Hope this helped!

Answer:

a) 2.5 b) 2.27 c) 2.38

Explanation:

a) 50/20=2.5 m/s

b) 50/22=2.27 m/s

c) (50+50)/(20+22)=2.38 m/s

Answer:

Velocity is quickness of motion or action. A synonym is celerity; a simpler word is speed. In physics, velocity specifically refers to the measurement of the rate and direction of change in position of an object.pls pls mark me branilest

Answer:

Velocity is defined as displacement travelled per unit time in a fixed direction. It is a vector quantity as it has both magnitude and fixed direction.

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If a standardized measuring system were not established, several problems could arise such as Lack of uniformity, Inefficiency and errors, Safety concerns and Economic impact.

Lack of uniformity: Without a standardized system, different regions or communities might develop their own measurement units, leading to confusion and inconsistency in communication and trade. It would be challenging to compare and reconcile measurements across different contexts.

Inefficiency and errors: A lack of standardized measurements could result in inefficiency in various sectors, such as construction, engineering, and manufacturing. Precision and accuracy would be compromised, leading to errors in calculations, designs, and product quality.

Safety concerns: Standardized measurements play a crucial role in ensuring safety, particularly in areas like medicine, transportation, and infrastructure. Without a common system, it would be difficult to establish safety standards, monitor compliance, and ensure uniformity in critical aspects like dosage, weight limits, and structural integrity.

Economic impact: Inconsistent measurement systems would hinder international trade and commerce. Harmonized measurements facilitate smooth transactions, accurate pricing, and quality control, leading to a stable and efficient economy. Without a standardized system, business operations and global collaborations would be significantly hindered.

In conclusion, a lack of a standardized measuring system would result in confusion, inefficiency, safety concerns, and economic setbacks, emphasizing the importance of establishing and adhering to universally accepted measurements.

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The three types of collisions are partially inelastic, complete inelastic and completely elastic collision.

The three types of collisions are partially inelastic, complete inelastic and completely elastic collision. Complete inelastic collision includes objects which will stick together afterward. Partially inelastic collision involves objects which cut apart after their collision, but deformations appear in some ways by the point of interaction. Elastic collision consists of objects which depart after the collision. These are the three types of  collisions. An elastic collision happens when two objects collide and bounce back to its initial place. So, the collision of two cars is not elastic rather, inelastic.

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If you move the revolving nosepiece in the wrong direction after viewing under oil immersion, the lens that could get dirty with oil is the 40x lens.

Oil immersion is a technique used in microscopy to increase the resolution and clarity of the image. It involves placing a drop of immersion oil on the slide and using a specially designed lens with a high numerical aperture (NA), such as the 100x objective lens, to maximize the collection of light.

The 40x lens is typically used before oil immersion in the microscopy process. When you move the revolving nosepiece in the wrong direction after viewing under oil immersion, there is a possibility that some oil residue may be left on the 40x lens. This can happen if you accidentally rotate the nosepiece in a counterclockwise direction, causing the lens to come into contact with the oil on the slide.

The other lenses, the 4x and 10x, are used at lower magnifications and are unlikely to come into contact with the oil immersion. They are generally positioned before the oil immersion step in the sequence of lens usage.

It is important to handle the microscope carefully and follow the correct procedure for using oil immersion to avoid damaging the lenses or getting them dirty. If oil does come into contact with the lenses, it should be cleaned off promptly using appropriate cleaning techniques to maintain the optical performance of the microscope.

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The system described by the transfer function G(s) = -co² s² + 2a + w², with a damping ratio of 1.3 and a natural frequency of 0.5, has an overdamped unit step response. So, the correct option is (E)

The transfer function of the system is given as G(s) = -co² s² + 2a + w², where co represents the damping ratio, a represents an arbitrary constant, and w represents the natural frequency of the system. We are given that the natural frequency is 0.5 and the damping ratio is 1.3.

To determine the type of unit step response, we need to analyze the damping ratio (co) in relation to the critical damping value (co_critical).

The critical damping ratio (co_critical) is defined as the value where the system is on the threshold between being overdamped and underdamped. It is given by the formula co_critical = 2 * sqrt(a * w²).

In our case, the natural frequency (w) is 0.5, so we can calculate co_critical as follows: co_critical = 2 * sqrt(a * 0.5²).

Since the damping ratio (co) is given as 1.3, we can compare it with co_critical to determine the type of unit step response.

If co > co_critical, the system is considered overdamped (Option E).

If co = co_critical, the system is considered critically damped (Option D).

If co < co_critical, the system is considered underdamped (Option C).

Based on the given values, we can determine that the system is overdamped (Option E) because the damping ratio (1.3) is greater than the critical damping ratio.

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Answer:

yes  it is write

Explanation:

The higher pressure will be produce secondly area of contact will be smaller area of contact than blunt nails. and friction is affected by three factors.

The tip with the smallest area will produce a higher pressure when a small force is applied.

The force per unit area is referred to as the pressure. i.e. P=F/A Therefore, the pressure is a function of the contact area A and the force F. Sharp-tipped nails have a much smaller area of contact than blunt (non-sharp) nails, hence they exert more pressure with relatively tiny forces.

The adhesion between body surfaces, surface roughness, and deformation of the bodies are the three basic determinants of the frictional force between two bodies.

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The fluid's specific gravity and volume are 2.57 and 74.8 ft3, respectively.  The fluid specific weight in unit of lbf/ft3. round to the nearest one decimal place is 159.6 lbf/ft3

The fluid's specific weight can be calculated as follows:

specific weight = specific gravity . density of water

Where,

specific gravity = 2.57

density of water = 62.4 lbf/ft3,

So, specific weight = 2.57 . 62.4 = 159.648 lbf/ft3

Rounding to the nearest one decimal place, the specific weight of the fluid is 159.6 lbf/ft3.

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The space shuttle travels approximately 0.00794 football fields in one blink of an astronaut's eye.

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The efficiency of this machine is 66.67%.

What is efficiency?

Efficiency is a measure of how well a machine or system is able to convert input energy into useful output energy. It is a ratio of the output energy to the input energy, expressed as a percentage.

An efficient machine or system is one that is able to convert a large portion of the input energy into useful output energy, with minimal energy loss. Conversely, an inefficient machine or system is one that loses a significant portion of the input energy as waste heat, sound, or other forms of energy that are not useful to the desired output.

The efficiency of a machine can be calculated using the formula:

Efficiency = (Energy Output / Energy Input) x 100%

In this case, the energy input is 7.55 and the energy output is 5.05, so we can calculate the efficiency as follows:

Efficiency = (5.05 / 7.55) x 100% = 66.67%

Therefore, the efficiency of this machine is 66.67%.

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The Rotational kinetic energy of wheel B is greater than that of wheel A.

Kinetic energy due to the rotation of an object is called Rotational Kinetic Energy. It is part of its total kinetic energy. Mathematically -

K[R] = 1/2 Iω²

where -

I = Moment of inertia around the axis of rotation

ω = Angular velocity

Given is wheel A that has three times the moment of inertia about its axis of rotation as wheel B and wheel B's angular velocity is four times that of wheel A. From the question, we can write -

I[A] = 3 I[B]

ω[B] = 4 ω[A]

Rotational Kinetic Energy of Wheel A →

K[A] = 1/2 I[A] ω[A]²

K[A] = 1/2 x 3 I[B] x (ω[B]/4)²

K[A] =  1/2 x 3 I[B] x ω[B]²/16

K[A] = 3/32 x ω[B]² x I[B]

K[A] = 0.094 x ω[B]² x I[B]

Rotational Kinetic Energy of Wheel B →

K[B] =  1/2 I[B] ω[B]²

K[B] = 0.5 x I[B] x ω[B]²

Clearly → K[B] > K[A]

Hence, rotational kinetic energy of wheel B is greater than that of wheel A.

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Answer:

we can predict where they are in the future, know where they were in the past

can also build a device that generates a specific type of desired movement,

Explanation:

With the knowledge of the laws that govern the movement of bodies, we can predict where they are in the future and therefore know if there may be an accident, crash.

We can also know where they were in the past and therefore know if a fact is the result of these movements, craters, collapse of buildings, etc.

We can also build a device that generates a specific type of desired movement, for example pulleys that help us with work, etc.