18. A rock is thrown straight upward with an initial velocity of 12.2 m/s from a location where the acceleration due to gravity is 9.8 m/s2. How high up does it go

Answer:

Density= 2.78 g/cm³

Relative density=2.8

Explanation:

To calculate the density of the cube we have to use the formula ρ=mass/volume

ρ stands for density.

So now we don't have the volume of the cube and to find the volume of the cube we have to use the formula a³

3³= 9 cm³

Now plug in the values. ρ= 25 g/9 cm³

ρ= 2.78 g/cm³

To find the relative density, we have to use the formula ρsample/ρH20

The sample means the density of the substance earlier. We do not know the density of water but it is constant at 997 kg/m³.

Now we have to make the units same so you change the unit of the density of cube to kg/m³

So, 25/1000= 0.025 kg

9/100×100×100 (because cm³ which means that there should be 3 meters to change the unit and to conver cm to meter we need to divide by 100 so 9cm/100, 9cm²/100×100, 9cm³/100×100×100)

=0.000009 m³

The new density= 0.025 kg/ 0.000009 m³

= 2777.78 kg/m³

Now plug the values into the formula:

relative density= 2.777.78 kg/m³ / 997 kg/m³

=2.8

There is no unit since kg/m³ and kg/m³ cancels

The river speed is maximum at point A. Option A is the correct answer.

The speed of a river on a circular turn is maximum at the outer part of the curve. This is because the water flowing in the river has to travel a greater distance on the outer curve as compared to the inner curve. Therefore, to cover the same distance in the same amount of time, the speed of the water has to be greater on the outer curve.

This is known as the principle of conservation of angular momentum, which states that the angular momentum of the water flowing in the river is conserved as it moves around the curve.

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--The complete question is, Examine the sketch of a bend in a river. The arrows show the water flow direction. In which of the four lettered locations will the water be moving at the highest velocity?

A) A

B) B

C) C

D) D--

a b c d

A V=V+gt

dhehehdhehdhshehehehehehe

Answer:

D: The velocity increases during the time periods labeled A and C

Explanation:

Since gravity pulls us down to Earth, it will pull down the ball faster when the ball is falling.

The internal energy of a system with two energy levels E₁ and E₂, with degeneracies g₁ and g₂ respectively, can be calculated as U = g₁E₁ exp(-E₁/(kT)) + g₂E₂ exp(-E₂/(kT)).


The internal energy of a system is the sum of all its energies. In this case, the system possesses two energy levels E₁ and E₂, with degeneracies g₁ and g₂ respectively. The degeneracy of a level is the number of ways in which it can be occupied.  

The internal energy can be calculated using the formula:

U = g₁E₁ exp(-E₁/(kT)) + g₂E₂ exp(-E₂/(kT))

where k is Boltzmann's constant and T is the temperature of the system.

Substituting the values of E₁, E₂, g₁, and g₂, we get:

U = -ε exp(ε/(kT)) + 2ε exp(-ε/(kT))

Simplifying further, we get:

U = ε(2exp(-ε/(kT)) - exp(ε/(kT)))

Therefore, the internal energy of the system as a function of ε, T, and k (Boltzmann's constant) is U = ε(2exp(-ε/(kT)) - exp(ε/(kT))).

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The height of the bleachers when a tennis ball dropped from the top and takes 3 seconds in flight is 45 m.

Height can be defined as the vertical distance between two points.

To calculate the height of the bleachers, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the height of the bleachers is 45 m.

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Answer:

I honestly think both of them are true

Answer:

Heat has shorter wavelengths than visible light.

Explanation:

(I had the same question)

I looked up the first one and it was wrong, and the missing options are incorrect. So It would not be all of the above. So, using process of elimination,  "Heat has shorter wavelengths than visible light" is correct.

I PROMISE this is correct

Assumed that resistors are connected in series .

Current=I

An organized way to collect and record scientific observations is with a data table (option C).

An experiment is a test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried.

The scientific method involves the collection of data and organizing them in a way that they can be easily interpreted.

However, the best way to collect and record scientific observations is with the aid of a data table.

A data table is any display of information in tabular form, with rows and/or columns named.

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The mass of the displaced water is equal to the mass of the iceberg, which is 30 kg.

The mass of the displaced water by a piece of 30 cm thick iceberg with its surface area 1000 sq cm when it floats on water can be calculated as follows;

1: Calculate the volume of the iceberg

The volume of the iceberg can be calculated as follows;

V = l × b × h

where l is the length, b is the breadth, and h is the height.

V = 1000 × 30V = 30,000 cm³

2: Calculate the mass of the iceberg

Mass = Volume × Density = V × D

For water, the density is 1 g/cm³= 30,000 × 1= 30,000 g or 30 kg

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Answer:

The two masses have identical masses, but the mass on Earth has more weight.

Answer:

59.18 kg

Explanation:

use f=ma

f= 580 N

a = 9.8 m/s 2

weigh(m) doesn't change only force(F) changes

Answer: 219.6N

Explanation:

Find the mass of this person by dividing his weight by the accelleration. Remember, F=ma

580 = m*9.8

m = 59.18kg

Then multiply the mass by the new gravitational acceleration on Mars.

59.18*3.711 = 219.6N

Latent heat is the energy required for 1 kg of a substance to change phase without altering its temperature.

This process involves breaking or forming intermolecular bonds, causing the substance to transition between solid, liquid, or gaseous states.

Two common types of latent heat are the latent heat of fusion (solid to liquid) and latent heat of vaporization (liquid to gas). The specific amount of energy needed depends on the substance's properties and the phase transition occurring.

By understanding latent heat, we can better comprehend various phenomena, such as the energy absorbed or released during melting, boiling, or other phase changes.

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The necessary speed with respect to the Earth for a rocket to escape if fired from the Earth at the equator in a direction eastward is 11.256 km/s. The necessary speed with respect to the Earth, for a rocket to escape if fired in a westward direction at the equator is 10.558 km/s.

The necessary speed, with respect to Earth, for a rocket to escape if fired from the Earth at the equator in a direction eastward will be

ve = 11.182 km/s

vr = 2πR/T

vr =2π(6,380 km)/(1 day)

vr = 464.7 m/s

vE= ve + vr = 11.182 km/s + 464.7 m/s = 11.256 km/s

The necessary speed with respect to Earth, for a rocket to escape if fired from the Earth at the equator in a direction eastward will be:

ve = 11.182 km/s

vr = 2πR/T

vr =2π(6,380 km)/(1 day)

vr = 464.7 m/s

vE = ve − vr = 11.182 km/s − 464.7 m/s

vE = 10.558 km/s

The necessary speed, with respect to Earth, for a rocket to escape if fired in a westward direction at 25° north latitude will be:

ve = 11.182 km/s

vr = 2πRcos(25°)/(1 day)

vr = 358.4 m/s

vE = ve − vr = 11.182 km/s − 358.4 m/s

vE = 10.599 km/s

The necessary speed, with respect to Earth, for a rocket to escape if fired from the Earth at the equator vertically upward is 11.182 km/s. Since the Earth is a sphere, any vertical movement will not cause the rocket to gain any additional speed with respect to Earth.

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Answer:

exothermic

Explanation:

Metals have shiny apperances

If you look at courage and if you look at the brain, there is one particular brain structure that plays a very important role when it comes to courage and your own performance. This part of the brain is called the amygdala. The amygdala is a brain structure that is very small, and we have two of them, one of the left side of the brain, one on the right side of the brain. They’re very small and look like an almond. Amygdala is also the Latin word for almond. Even though they are small, they amygdala is also extremely powerful. It plays a very important role in our survival. Whenever there is a real danger outside, it will trigger a fight, flight or freeze response, so you will fight danger, run away, or just be blocked in your own emotions, you will freeze, perhaps you will hide. The amygdala is very important for our survival and for many emotions in general, but in many situations, the amygdala will also become active when there is no real danger, for example, standing on stage and holding a presentation, leading a difficult conversation. These are two examples where there’s no real danger, but nevertheless, the amygdala can be triggered and cause this feeling of nervousness and anxiety. It’s these feelings of nervousness, anxiety or insecurity that will also block us in our potential to hold a presentation or to lead a good conversation.

The radius of the track is 5 meters.

To find the radius of the track, we can use the formula for centripetal force:

F = (m * \(v^2\)) / r

where F is the centripetal force, m is the mass of the race car, v is its velocity, and r is the radius of the track.

Plugging in the given values:

F = 16,000 N

m = 800 kg

v = 40 m/s

We can rearrange the formula to solve for r:

r = (m *\(v^2\)) / F

r = (800 kg * \((40 m/s)^2\)) / 16,000 N

Calculating the expression:

r = (800 kg * \(1600 m^2/s^2\)) / 16,000 N

r = 80,000 kg·\(m^2/s^2\) / 16,000 N

Simplifying:

r = 5 m

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I do practice for the science ACT are: - Learn the exam through a diagnostic test. Pay attention to timing. Take practice tests. Then take some more. Evaluate your mistakes. Work with an ACT tutor.

The Science section of the ACT is a 35-minute, multiple-choice test that assesses a student's understanding of scientific concepts and their ability to apply scientific reasoning and critical thinking skills. The test contains 40 questions that are based on scientific passages, data, and experiments. The questions cover topics in biology, chemistry, physics, and earth science, and require students to analyze and interpret information presented in charts, graphs, and diagrams.

The Science section is scored on a scale of 1-36, and is one of four sections on the ACT, along with English, Math, and Reading. A strong performance on the Science section can help students showcase their skills in scientific inquiry and critical thinking and demonstrate their readiness for college-level coursework in science and related fields. Many students choose to prepare for the Science section by reviewing key scientific concepts and skills, taking practice tests, and using test-taking strategies to maximize their performance on test day.

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Answer:

chenged when not anet force

0.013 m/min If a cylindrical tank with a radius of 7 m 7 m is filling with water at a rate of 4 m 3 /min, ast is the height of the water rising. 4 m 3 /min

The diameter of a circle cuts through the center, whereas the radius circumscribes the circle from edge to edge. The size of a circle essentially divides it in two.

A radius is a line segment that has one endpoint in the circle's center and the other terminus on the circumference of the circle. Circle's diameter equals the radius The diameter of a circle is a line segment that has its ends on the circle and passes through its center. Radius x 2 equals the diameter.

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Answer:

The answer is Muscular endurance

Explanation:

It is this because your seeing how long your muscles can with stand. I answered by guessing lol.

Answer:

M = 4.5

Explanation:

He ran 3 meters, which is three meters. Then he ran back half of 3, which is 1.5 meters. 3 + 1.5 is 4.5

To improve a self-running generator using a magnet and copper wire, some methods include increasing wire turns, using stronger magnets, optimizing coil design, positioning magnets effectively, increasing rotation speed, and using high-conductivity copper wire.

To improve a self-running generator using a magnet and copper wire, here are a few methods:

1. Increase the number of wire turns: By increasing the number of turns in the copper wire coil, the magnetic field passing through the coil is strengthened, resulting in a higher induced voltage and increased generator output.

2. Use stronger magnets: By using magnets with higher magnetic strength, the magnetic field interacting with the copper wire coil will be stronger, leading to a greater induced voltage and improved generator performance.

3. Enhance the design of the coil: Constructing the copper wire coil in a way that maximizes the number of wire turns while maintaining proper spacing and alignment can optimize the interaction between the magnetic field and the coil, resulting in improved efficiency and power generation.

4. Optimize the magnet position and orientation: Positioning the magnets closer to the copper wire coil and aligning them properly can enhance the magnetic field flux density passing through the coil, thereby increasing the induced voltage and improving generator efficiency.

5. Increase the speed of rotation: Rotating the magnet at a higher speed relative to the copper wire coil increases the frequency of the induced voltage, which in turn improves the generator's power output.

6. Utilize high-conductivity copper wire: Choosing copper wire with higher conductivity reduces resistive losses and enhances the efficiency of the generator, resulting in improved overall performance.

It's important to note that achieving a self-running generator that generates more power than it consumes is a complex task and often requires sophisticated engineering and advanced understanding of electrical and magnetic principles. It is crucial to adhere to the laws of thermodynamics and ensure a complete and efficient energy conversion process to achieve sustainable self-running operation.

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Answer:

i) 20-30 kg

Explanation:

The child with the smallest mass range of 20-30 kg will require the smallest force to move his skate board because he/she has a smaller inertia force to overcome. The mass of a body is the measure of the inertia forces of the body. The inertia force makes it difficult for a body at rest to start moving, and a body already in motion to stop moving.

When the children try to move the skateboard, they exert a force that is proportional to the product of their mass and the acceleration with which they start moving. This force must exceed their body's inertia force before they would start moving.

from

F = ma

where F is the force required

m is the mass

a is the acceleration

We can see that for the given mass ranges, the children with the larger mass range will require more force in order to move their skateboard. Consequently, the child with the smallest mass range will require the smallest pushing force to move his skate board.

Answer:

handle, trigger, spindle

The distance from the central bright fringe to the 3rd dark fringe is approximately 0.48 cm.

Solution

The distance between the central bright fringe and the 3rd dark fringe in a double-slit experiment is given by:

y = (m * λ * L) / d

If y denotes the distance between the edges,

m is the fringe order (an integer value representing the number of bright or dark fringes away from the central fringe),

λ is the wavelength of the light,

L is the length between the two slits.

The distance between the two slits is given by d.

Substituting the given values, we get:

y = (3 * 600 nm * 150 cm) / 3.55 μm

y = 4800 nm

Converting nanometers to centimeters, we get:

y = 4800 nm * (1 cm / 10^7 nm)

y = 0.48 cm

Therefore, the distance from the central bright fringe to the 3rd dark fringe is approximately 0.48 cm.

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True, colder average temperatures and longer nights in Edmonton and Calgary lead to high energy usage to heat and light homes.

In Edmonton and Calgary, colder average temperatures and longer nights are characteristic of their climate. During the winter months, temperatures drop significantly, often reaching below freezing levels, and the duration of daylight is reduced due to shorter days and longer nights.

These weather conditions necessitate increased energy usage for heating and lighting homes. As the temperatures drop, residents rely on heating systems to maintain a comfortable indoor temperature, leading to higher energy consumption. This includes the use of furnaces, heaters, and other heating devices.

Moreover, the longer nights in these cities result in a greater need for artificial lighting Latitude. With fewer daylight hours available, residents must rely on electric lighting for a more extended period, contributing to increased energy usage.

Overall, the combination of colder temperatures and longer nights in Edmonton and Calgary creates a higher demand for energy to heat and light homes, making the statement true.

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