19. Calculate the work done when a 30 N force pushes a rock 10 m. a) 3J b) 0.33 J c) 40 J d) 300 J

20. How far did a rock move if a force of 200 N moved it doing 100 J of work? a) 2 m b) 0.5 m c) 20,000 m d) 300 m

21. An explosion of gas from a Hawaiian volcano blows a rock into the sky. the rock has 2000J of kinetic energy. What was its mass if the rock had a velocity of 20m/s. a) 200Kg b) 20,000Kg c) 10Kg d) 200Kg

22. How much potential energy does a 2 kg book have if it is 2 meters from the ground? a) 39.2J b) 12 J c) 19.6 J d) 98 J

23. 45J of work were done on the object that moved 5M. How much force was applied to the object? a) 8N b) 9N c) 225N d) ON

24. If you do 40 joules of work lifting a 10N box, how high is the shelf you move it to. a) 400m b) 50m c) 40m d) 4m

25. A force of 100 newtons was necessary to lift a rock. A total of 150 joules of work was done. How far was the rock lifted? a) 1.5 m b) 15 m c) 0.15 m d) 150 m​

Based on World Health Organization (WHO), the UV region covers the wavelength range of  100-400 nm and it is one that is  divided into three bands:

The UVA category of UV radiation has a higher energy level than UVC but lower than UVB. The UVA region has specific approximate minimum and maximum wavelength values.

It is vital to acknowledge that there is some degree of approximation involved in these values, which may vary marginally from one source to another based on their precise definitions.

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Answer:

1 book per shelf

Explanation:

So, there's 20 books, and Jeremy has 4 shelves

If Jeremy arranges the books equally. so each shelf has the same out of books, do 20 / 4 to get the amount of books per shelf

20 / 4 = 5 books per shelf

Now, if Brandon takes away 4 books from each shelf, do 5 - 4 to find the remaining amount of books per shelf

5 - 4 = 1

1 book per shelf left

The atmosphere protects life on Earth by filtering harmful UV radiation, regulating solar radiation and heat, shielding against cosmic rays and space debris, maintaining atmospheric pressure for respiration, and mitigating the impact of meteorological hazards.

Our atmosphere provides several key protections to life on Earth:

Ultraviolet (UV) Radiation: The atmosphere contains the ozone layer, which helps filter out a significant amount of harmful UV radiation from the Sun. UV radiation can cause skin damage, including sunburns and an increased risk of skin cancer.

Solar Radiation and Heat: The atmosphere absorbs and scatters a portion of the Sun's solar radiation, reducing the intensity of direct sunlight that reaches the Earth's surface. It helps regulate temperatures by trapping heat through the greenhouse effect, preventing extreme temperature fluctuations.

Cosmic Rays and Space Debris: The atmosphere acts as a shield against high-energy cosmic rays and most space debris, such as small meteoroids, by causing them to burn up or disintegrate upon entry. This protection prevents them from reaching the Earth's surface and causing potential harm.

Atmospheric Pressure: The atmosphere exerts pressure on the Earth's surface, creating a stable environment for life. It allows us to breathe comfortably by ensuring that air molecules are present at a sufficient density for respiration.

Protection from Meteorological Hazards: The atmosphere plays a crucial role in weather patterns, helping to distribute heat, moisture, and energy across the planet. It provides a buffer against extreme weather events like hurricanes, tornadoes, and severe storms, helping to mitigate their impact.

Therefore, our atmosphere serves as a protective barrier that shields us from various harmful external factors, maintaining a stable and habitable environment for life on Earth.

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The given statement "The electrostatic force is between two objects is proportional to the reciprocal of the distance squared" is True.

The electrostatic force between two objects is indeed proportional to the reciprocal of the distance squared.

This relationship is described by Coulomb's Law, which states that the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Mathematically, the equation for electrostatic force is F = k * (q1 * q2) / \(r^{2}\), where F is the electrostatic force, k is the electrostatic constant, q1 and q2 are the charges of the objects, and r is the distance between them.

As the distance between the objects decreases, the force increases quadratically, and as the distance increases, the force decreases in the same manner.

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The mass of the blood denoted is 501.6 g.

The mass of the blood denoted by Keona is calculated by applying the formula for density of a liquid as shown below.

density = mass/volume

mass = density x volume

The given parameters include;

The mass of the blood is calculated as follows;

mass = 1.06 g/mL x 473.176 mL

mass = 501.6 g

Thus, the mass of the blood is calculated from the formula of density.

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The complete question is below

While participating in a blood drive at school, Keona learns that blood has a density of 1.06 g/mL. She donates one pint of blood, which is equal to 473.176 mL. find the mass of the blood denoted.

In an experiment, researchers want to determine if the independent, variable causes changes in the dependent variable.

The variable being measured or evaluated in an experiment is known as the dependent variable.  The results of the participants' tests, for instance, since that is what is being examined, would be the dependent variable in a research looking at how tutoring affects test scores.

A variable that is independent is precisely what it sounds like. It is a stand-alone variable that is unaffected by the other variables you are attempting to assess. Age, for instance, might be an independent variable.

A variable that may be altered during an experiment is referred to as an independent variable. Manual manipulation is possible. On the dependent variable, the impact of such modification and manipulation may be seen.

The dependent variable is the one that changes as a result of the experimenter's adjustments and modifications to the independent variable.

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Answer: C or independent, dependent

Explanation: your welcome!:)

Answer:b

Explanation:

im in fifth grade so i guessd. gl tho heh.

The answer will be an option C. The momentum would be eliminated for the running back.

The collision in which the object bounces off after the collision is called the elastic collision. The one condition is given in the question that after the collision the running back bounces back and the linebacker stops

A linebacker runs at 3 m/s and collides with a running back running toward him at 3.2m/s. If the running back bounces back and the linebacker stops it means that the collision is elastic. And all the momentum is transferred to the other person.

Therefore the answer will be an option C. The momentum would be eliminated for the running back.

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The kinetic energy of an object that has a mass of 50.0 kg and a velocity of 18m/s is 8,100J.

Kinetic energy refers to the energy of a body due to its motion. The kinetic energy can be calculated as follows:

K.E = ½ m × v²

Where;

According to this question, an object that has a mass of 50.0 kg and a velocity of 18m/s. The kinetic energy can be calculated as follows:

K.E = ½ × 50 × 18²

K.E = ½ × 16,200

K.E = 8100J.

Therefore, the kinetic energy of an object that has a mass of 50.0 kg and a velocity of 18m/s is 8,100J.

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Answer :

(A) 34

Explanation :

The alternating series error bound states that the error, E, between the sum of an alternating series and the true value of the series is bounded by the absolute value of the first omitted term, a sub (n+1), which in this case is (-1)^(n+1) / (n+1).

We want to find the least number of terms in the series that must be summed to guarantee a partial sum that is within 0.03 of S. In other words, we want to find n such that:

| E | ≤ 0.03

Substituting the expression for E and the formula for a sub (n+1), we get:

|(-1)^(n+2) / (n+2)| ≤ 0.03

Multiplying both sides by (n+2) and simplifying, we get:

1 / (n+2) ≤ 0.03

(n+2) ≥ 1 / 0.03

n ≥ (1 / 0.03) - 2

n ≥ 33.33

Since n must be a positive integer, the least number of terms that must be summed is 34. Therefore, the answer is (A) 34.

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The balanced chemical equation for the given reaction is: 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

To balance the chemical equation C₂H₆ + O₂ → CO₂ + H₂O, we need to ensure that there is an equal number of each type of atom on both sides of the equation.
1. Begin with the most complex molecule, which is C₂H₆ in this case. There are 2 carbon atoms and 6 hydrogen atoms in the reactant side, so we need to have the same number of atoms on the product side.
2. First, balance the carbon atoms. There is only 1 carbon atom in CO₂, so multiply it by 2 to balance the carbons:
C₂H₆ + O₂ → 2CO₂ + H₂O
3. Now, balance the hydrogen atoms. There are 6 hydrogen atoms in C₂H₆, and only 2 in H₂O, so multiply H₂O by 3 to balance the hydrogens:
C₂H₆ + O₂ → 2CO₂ + 3H₂O
4. Finally, balance the oxygen atoms. We have 4 oxygen atoms in 2CO₂ and 3 oxygen atoms in 3H₂O, totaling 7 oxygen atoms on the product side. To balance the oxygen atoms, we need 3.5 O₂ molecules (since 3.5 x 2 = 7) on the reactant side:
C₂H₆ + 3.5O₂ → 2CO₂ + 3H₂O
5. However, it's better to work with whole numbers, so multiply the entire equation by 2 to get rid of the fraction:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

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complete question:

Balance the following equation:

​C₂H6 + O₂ -> CO₂ + H₂O

Answer:

E......1,800 meters

Explanation:

distance = speed × time

convert 1 min to seconds because speed is give in meters per seconds so it's which is 60 seconds

Then...60 ×30 = 1,800

Both caesium-137 and iodine-131 emit ionizing radiation, which can damage living tissue and increase the risk of cancer.

Isotopes are members of the same element's family but have variable numbers of neutrons despite having the same number of protons.

Iodine-131 and caesium-137 both produce ionizing radiation, which can harm living things and raise the risk of cancer.

Due to their varied half-lives and processes of decay, each isotope's danger has changed between 1986 and 2018 despite this.

Caesium-137 degrades gradually over time since it has a longer half-life of roughly 30 years. Iodine-131, on the other hand, degrades swiftly because of its significantly lower half-life of only around 8 days.

Thus, the risk has diminished over time as a result of radioactive decay.

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The latitude and longitude coordinates for Location C are given as 50S, 68W. Therefore, the correct answer is 4) Cannot discern from the information provided.

Latitude and longitudinal lines are shown on a globe of Earth as parallel and vertical lines. To determine which distance is farther, we need to compare the distance between Location B and the Equator with the distance between Location C and the Equator.

However, the latitude and longitude coordinates for Location B and the specific direction or coordinates of the Equator are not provided. Without this information, it is not possible to determine which distance is farther between Location B and the Equator or Location C and the Equator.

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Answer:

i would help but im just as confused. sorry.

The surface is reflecting wavelengths greater than 690 nm, which falls outside the range of sensitivity for S cones. This means that S cones will have minimal to no response to the reflected light.

S cones, also known as short-wavelength cones or blue cones, are one of the three types of cone cells in the human eye responsible for color vision. They are most sensitive to shorter wavelengths of light, primarily in the blue region of the spectrum.

S cones are most responsive to wavelengths around 420-440 nm, corresponding to the blue region of the visible spectrum. As the wavelength increases beyond this range, the response of S cones decreases. When the wavelength exceeds 690 nm, which is in the longer red part of the spectrum, the response of S cones is significantly diminished.

The lack of S cone response to wavelengths greater than 690 nm is due to the fact that these cones are not optimized to detect longer wavelengths of light. Instead, they are specialized to perceive shorter wavelengths associated with the blue color.

Therefore, in the given scenario, the reflected light containing wavelengths greater than 690 nm will be primarily detected by M and L cones, while the S cones will have minimal or no response to this light.

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Promoting the culture of your country in a creative way requires a combination of civic engagement and creative expression. Here are some civic-minded approaches you can consider:

Cultural Events and Festivals: Organize or participate in cultural events and festivals that showcase the traditions, music, dance, food, and arts of your country. These events can bring people together, foster cultural exchange, and create a sense of pride in your country's heritage.

Cultural Education: Collaborate with schools, community centers, and local organizations to develop cultural education programs. These programs can include workshops, lectures, or classes that teach traditional crafts, languages, history, or other aspects of your country's culture.

Cultural Preservation: Engage in efforts to preserve and protect cultural landmarks, historical sites, and artifacts. This can involve volunteering for restoration projects, advocating for heritage preservation laws, or raising awareness about the importance of cultural heritage.

Cultural Exchange Programs: Initiate or participate in cultural exchange programs that allow people from different countries to share experiences and learn about each other's cultures. This can be done through student exchanges, artist collaborations, or cultural immersion programs.

Online Presence: Utilize social media platforms, blogs, or websites to share stories, photos, and videos that highlight the cultural richness of your country. This can reach a wider audience and create opportunities for cross-cultural dialogue.

Collaborations with Artists: Support and collaborate with local artists, musicians, filmmakers, and writers who can contribute to promoting your country's culture through their creative works. This can include organizing exhibitions, concerts, film screenings, or publishing cultural literature.

Cultural Tourism: Work with local tourism authorities to develop cultural tourism initiatives that showcase the unique aspects of your country's culture. This can involve creating cultural tours, promoting traditional accommodations, or organizing cultural exchange programs for tourists.

Remember, promoting your country's culture in a creative way requires a sense of civic responsibility, respect for diversity, and a commitment to preserving and celebrating your heritage. By engaging the community and utilizing creative platforms, you can inspire others to appreciate and embrace the culture of your country.

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The other piston must be lowered by 2 m to lift the car 2 m using the equation for hydraulic pressure.

To lift a 3000 lb car with a hydraulic lift, the piston with the larger area (2500 cm^2) should be placed under the car. The force required to lift the car can be calculated using the equation for hydraulic pressure:

P = F / A

where P is the pressure, F is the force, and A is the area of the piston. Plugging in the values, we get:

P = 3000 lb / 2500 cm^2 = 1.2 lb/cm^2

The force required to lift the car is then transmitted to the other piston, which has a smaller area (50 cm^2), by the fluid. The pressure on this piston is the same, so the force required to lift the car is:

F = P * A = 1.2 lb/cm^2 * 50 cm^2 = 60 lb

To lift the car 2 m, the other piston must be lowered by an amount equal to the product of its area and the change in pressure due to the height of the lift. The change in pressure is given by the equation:

ΔP = ρgh

where ρ is the density of the fluid, g is the acceleration due to gravity, and h is the height of the lift. Plugging in the values, we get:

ΔP = 1000 kg/m^3 * 9.8 m/s^2 * 2 m = 19680 Pa

The change in the height of the other piston is then:

Δh = ΔP / (ρg) = 19680 Pa / (1000 kg/m^3 * 9.8 m/s^2) = 2 m

So the other piston must be lowered by 2 m to lift the car 2 m.

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Answer:

The kinetic energy of the sliding block is =1/2×m×v  

2

 =1/2×4×2  

2

=8 J

Now since there is no friction on the surface then it is a conservative system. So all the energy of the block will be transferred to the spring and will store as a potential energy. Suppose it will compress the spring by an amount of x m. So the potential energy of the spring will be =1/2×k×x  

2

Equating there two energies and solving for x, we will get, 1/2×k×x  

2

=8

Or  0.5(400)x  

2

=8

⟹x=0.2 m.  

Explanation:

The magnitude of the net force is zero and the direction of the net force is north.

Given that: A 2000kg car is driving north at a steady speed of 90 km/hr (25m/s). The rolling resistance and air friction together is 40000N.To find:The magnitude and direction of the net force.Solution:To find the magnitude of the net force, we need to use Newton's second law of motion, which states that the force acting on an object is equal to the product of the object's mass and its acceleration, that is,F = ma Where,F is the net force acting on the object.m is the mass of the object.a is the acceleration of the object.

To find the direction of the net force, we need to consider the direction of all the forces acting on the object. If all the forces act in the same direction, the direction of the net force is the same as the direction of the forces. If the forces act in opposite directions, the direction of the net force is in the direction of the larger force, that is, the direction of the force that is not canceled out by the other force.

So, we have:m = 2000 kg (mass of the car)a = 0 m/s² (since the car is moving at a constant speed, its acceleration is zero)F_R + F_A = 40000 N (rolling resistance and air friction together is 40000 N)F_net = ma = 2000 kg × 0 m/s² = 0 N (since the car is moving at a constant speed, its acceleration is zero)Since the car is moving north at a steady speed, the direction of the net force is also north. Therefore, the magnitude of the net force is zero and the direction of the net force is north.

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c) None of these. Given that the nucleus is known to be an isotope of lead, we can infer that it has the same atomic number as lead, which is 82.

The atomic number of an element is the number of protons in the nucleus of an atom. It is a unique identifier for each element and determines its position in the periodic table. The atomic number defines the element's chemical properties and determines its identity.

However, without additional information, we cannot determine the specific neutron number or atomic mass number of the isotope. Different isotopes of lead can have varying numbers of neutrons, resulting in different atomic mass numbers. Therefore, the neutron number and atomic mass number cannot be specified solely based on the information provided.

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To determine the distance covered by the race car on the straight track in 10 seconds, we can use the formula: distance = velocity x time.

The velocity of the car is  80 meters per second, and we want to find the distance covered in 10 seconds, we can plug in these values into the formula: distance = 80 m/s x 10 s
distance = 800 meters
Therefore, the race car would have covered a distance of 800 meters in 10 seconds on the straight track.

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A two-slit interference experiment is set up and the fringes are displayed on a screen. then the whole apparatus is immersed in the nearest swimming pool. The fringes will be closer together when the young two-slit interference setup experiment is immersed. In water.

It is the phenomenon of bending of light when it travels from one medium to another medium. The bending towards or away from the normal depends upon the medium of travel as well as the refractive index of the material.

The fringes of a two-slit interference experiment are set up and shown on a screen. The nearest swimming pool is then filled with the entire contraption. When the young stabilizers experiment is submerged, the fringes will move closer together in the water.

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Answer:

where the rocks are exposed to really hot conditions and high pressure....these conditions are found deep where tectonic plates meet or deep inisde the earth past our core

hope this helps !!!!!

Answer:

high heat, high pressure, hot mineral-rich fluids or commonly a combination of these found deep in the Earth or where tectonic plates meet.

Explanation:

I hope this helps :3

Answer:

5 seconds

Explanation:

sound travels 1 km in roughly 3 secs so 1 mile in roughly 5 secs.

When a fragment of bone containing carbon-14 isotopes of the element carbon is discovered during an archaeological dig, and it is estimated to be approximately 23,000 years old, one can calculate the proportion of the carbon-14 isotopes that remains.

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Answer:

2cm/year

Explanation:

20000/10000=2cm/year

Explanation:

To determine the angular velocity of the spool, you can follow these steps:

Step 1: Identify the known variables.
The known variables in this case are the linear velocity of the cable (va) and the radius of the inner core (r).

Step 2: Understand the relationship between linear and angular velocity.
The relationship between linear velocity (va) and angular velocity (ω) can be described by the equation: va = rω.

Step 3: Solve for the angular velocity.
Rearrange the equation from step 2 to solve for the angular velocity: ω = va / r.

Step 4: Plug in the known variables.
Substitute the given values of va and r into the equation: ω = va / r.

Step 5: Calculate the angular velocity.
Perform the calculation to find the angular velocity of the spool.

By following these steps, you will be able to determine the angular velocity of the spool.

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Answer: hello your question is poorly written attached below is the well written question

answer: 4.9 * 10^-5 T

Explanation:

Current ( i ) = 39.30 A

Determine the magnitude of the B-field at Point P

Mag of B-field at Point P = μo*I / 2π*r --- ( 1 )

where : I = 39.30 , μo = 4π * 10^-7 , r = 8*10^(-2)

Input values into equation 1

( 10^-7 * 39.30 ) / ( 8*10^-2 )

∴ Mag of B-field = 4.9 * 10^-5 T

Answer:

Explanation:

You can use a one-dimensional physics equation to find the horizontal distance:

Δx = \(v_{0}t+\frac{1}{2}at^2\) where v0 is the initial velocity (30 m/s), t is time, and a is accleration. There is 0 acceleration in the horizontal dimension so the equation becomes

Δx\(=v_{0}t\) which is a fancy and meant-to-be-intimidating version of "distance - rate times time". The delta x is the distance traveled and our known, v0 is the initial velocity, and t is time. We have the rate and the time:

Δx = \((30)2_\) which gives us the horizontal distance of 60 meters

Quick Answer: Science Can’t Figure Out Why Our Bikes Don’t Fall Over When We Ride Th Some physicists thought that the spinning wheels of a bicycle create enough angular momentum