Which statement correctly describes a characteristic that a scientific
measuring tool should have?
A. To be accurate, it must be able to make measurements using very
large units.
O B. To be accurate, it must be able to give consistent measurements
of a quantity
C. To be accurate, it must be able to make measurements using very
small units.
O D. To be accurate, it must be able to make measurements that are
close to the actual value.

The angular momentum of a rotating two-dimensional rigid body about its center of mass G is I_Gω. Hence, the correct answer is (d) I_Gω.

Angular momentum is defined as the amount of rotational motion that a body has when rotating about an axis, which is given by L = Iω. Here, I is the moment of inertia and ω is the angular velocity. The moment of inertia is a measure of the object's resistance to rotational motion. It depends on the object's mass and its distribution about the axis of rotation.

The moment of inertia is different for different axes of rotation, but if an object is rotating about its center of mass, then the moment of inertia is minimum, which is denoted by I_G. Therefore, the angular momentum of a rotating two-dimensional rigid body about its center of mass G is given by I_Gω, as stated in option (d).

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Answer:

Parasitic Relationship

A symbiotic relationship that is mutualism exists between the comma teasel and all of the other plants.

Symbiosis or symbiotic relationship is any type of close and long-term biological interaction which is present between two different biological organisms, be it mutualistic relationship, commensalistic relationship, or parasitic relationship. The organisms, each termed as a symbiont, must be of different species.

The comma teasel and all of the other plants share a relationship where, the comma teasel pollinates flowers of different plant species. Pollination is important for the reproduction in plants and in return, the plants provide nectar to the organism.

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The slope of the graph is acceleration of the car with a value of 3.2 m/s².

The given parameters;

The initial velocity of the car in m/s is calculated as follows;

\(60 \ \frac{km}{hr} \times \frac{1 \ hr}{3600 \ s} \times \frac{1000 \ m}{1 \ km} = 16.67 \ m/s\)

The acceleration of the car is calculated as follows;

\(a = \frac{v- u}{t} \\\\a = \frac{80 - 16.67 }{20} \\\\a = 3.2 \ m/s^2\)

The graph of the velocity against time and acceleration against time is in the image uploaded.

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Answer:

5 years\(\)

African Americans would have the power to elect representatives who would fight for their rights and interests. They would be able to participate in local, state, and national politics, bringing their unique perspectives and concerns to the table.

African Americans would also have a greater say in issues affecting their communities, such as education, healthcare, and criminal justice reform. With the ability to vote, African Americans would gain a stronger voice and greater influence in shaping the policies and laws that govern their lives. However, the right to vote alone does not guarantee equality or justice, and there would still be significant challenges and obstacles to overcome in the fight for racial equality. It would take ongoing activism and advocacy to ensure that the voting rights of African Americans are protected and that their voices are heard.
 

African Americans also participated in political campaigns and formed political organizations to raise awareness about issues affecting their communities. By engaging in the democratic process, they worked to dismantle systemic racism and contribute to a more inclusive society. Their increased involvement in politics helped to advance the civil rights movement and shape the political landscape of the United States.

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Answer:

minimum interface length = 1.36 mm

Explanation:

given data

weight of the bug = \(10^{-4}\) N

solution

we will apply here Surface Tension formula that is

Surface Tension ,σ = Force ÷ length      ........................1

and we consider here surface tension for water is 7.34 × \(10^{-2}\) N/m

so that here minimum interface length needed to support the bug is

minimum interface length = Force ÷ σ

minimum interface length = \(10^{-4}\)  ÷ 7.34 × \(10^{-2}\)

minimum interface length = 1.36 mm

The formula for calculating density is expressed as

Density = mass/volume

From the information given,

mass of empty pycnometer = 10.2

mass of the same pycnometer with an unknown liquid is 21.8.

Mass of unkown liquid = 21.8 - 10.2 = 11.6

volume of unknown liquid = 7

Thus,

Density = 11.6/7

Density = 1.7 g/ml

Answer:

I kinda dont remember the 1st law so search it up on

and it should tell u , but if u need any help from the

true because

brick: solid

milk: liquid

ice cube: solid

Answer:

Electric current is electric charge in motion. It can take the form of a sudden discharge of static electricity, such as a lightning bolt or a spark between your finger and a ground light switch plate. ... Most electric charge is carried by the electrons and protons within an atom.

Explanation:

because it is

Characterizing 90Sr/90Y contamination in a legacy facility requires a procedure that can meet a total contamination (fixed plus removable) MDA of 1000 dpm/100cm2.

The procedure uses gas proportional probes that measure 10cm x 15cm, which will scan the floors and walls of the facility. The 150 cm2 area probe will be moved along its 10cm axis. This question aims to find the scan speed that must be maintained to meet the specified MDA.

Assumptions: The detector efficiency is 0.35 cpm/dpm, and the probe background is 500 cpm.

The MDA can be determined using the following equation:MDA = (2.71 × B × t × E) / Awhere, B = background count rate, t = counting time, E = detector efficiency, and A = area of the surveyed surface.Substituting the given values, we get:1000

= (2.71 × 500 × t × 0.35) / 100Simplifying this equation, we get:t

= (100 × 1000) / (2.71 × 500 × 0.35)

The time required to survey an area of 150 cm2 with a 10 cm axis is 42.96 seconds.

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The volume of the triangular shape is 10.35 km³.

In geometry, volume is the amount of space enclosed by a three-dimensional object. It is measured in cubic units, such as cubic meters or cubic centimeters. The volume of a regular object can be calculated using a formula, while the volume of an irregular object can be calculated by dividing it into smaller regular objects and adding up their volumes.

For example, the volume of a cube with a side length of 1 meter is 1 cubic meter. The volume of a sphere with a radius of 1 meter is 4/3π cubic meters. The volume of a cylinder with a radius of 1 meter and height of 2 meters is 2π cubic meters.

The formula gives the volume of a triangular shape:

V = 1/2 * b * h * t

where:

b is the base of the triangle

h is the height of the triangle

t is the thickness of the triangle

In this case, we have:

b = 7 km

h = 1.9 km

t = 3 km

So now, the volume of the triangular shape is:

V = 1/2 * 7 km * 1.9 km * 3 km = 10.35 km³

Therefore, the volume of the triangular shale is 10.35 km³.

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Answer:

Speed of lighter ball is 4 m/s.

Explanation:

Applying the principle of conservation of linear momentum,

momentum before collision = momentum after collision.

\(m_{1}\)\(u_{1}\) + \(m_{2}\) \(u_{2}\) = \(m_{1}\)\(v_{1}\) - \(m_{2}\)\(v_{2}\)

\(m_{1}\) = 3 kg, \(u_{1}\) = 8 m/s, \(m_{2}\) = 2 kg, \(u_{2}\) = 0 m/s ( since it is at rest), \(v_{1}\) = 2 m/s, \(v_{2}\) = ?

(3 x 8) + (2 x 0) = (8 x 2) - (2 x \(v_{2}\))

24 + 0 = 16 - 2\(v_{2}\)

2\(v_{2}\) = 16 - 24

2\(v_{2}\) = -8

\(v_{2}\) = \(\frac{-8}{2}\)

   = -4 m/s

This implies that the light ball moves at the speed of 4 m/s in the opposite direction of the heavier ball after collision.

F=150N.

A high wind velocity is defined as quickness of motion or operation; swiftness; or speed.

The speed at which a body's position changes over time in a given direction is known as mechanics. the velocity of activity or reaction; the rate at which something occurs.

Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is traveling along a path. The displacement that an object or particle experiences with respect to time are expressed vectorially as velocity

(1400-1250)

150 N

F=150N

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Answer:

m = 100[gram]

Explanation:

In order to solve this problem, we must remember the definition of the density of matter, which is the relationship between mass and volume. The density can be calculated by means of the following formula.

\(Ro=m/V\)

where:

Ro = density = 1 [gramm/cm³]

m = mass [gramm]

V = volume = 100 [cm³]

Now replacing:

\(m=Ro*V\\m=(1\frac{grm}{cm^{3} } )*100cm^{3} \\m=100[gram]\)

The Zenith angle at 45 degrees North during the Spring Equinox is 45 degrees.

The Zenith angle is measured as the angle between the vertical line (directly overhead) and the line connecting the observer to the Sun. During the Spring Equinox, when the Sun is directly above the Equator, the Zenith angle at any latitude is equal to the latitude itself.

To calculate the Zenith angle, Solar elevation angle, and beam spreading at a site located at 45 degrees North on the Autumnal equinox (September 22nd), additional information is needed, such as the time of day and the observer's exact location (longitude). These factors affect the position of the Sun in the sky. The Zenith angle is the angle between the vertical line and the line connecting the observer to the Sun. The Solar elevation angle is the complement of the Zenith angle (90 degrees minus the Zenith angle). Beam spreading refers to the divergence of the solar beam as it travels through the atmosphere, which is influenced by factors such as atmospheric conditions and the Sun's position.

The latitude at which daylight hours have the least variability is the Equator (0 degrees latitude). At the Equator, the length of daylight hours remains relatively constant throughout the year, with minimal variation. In contrast, as you move farther away from the Equator towards the poles, the variability in daylight hours becomes more pronounced, with significant changes between the seasons.

False. The spread of the solar beam, known as beam spreading, is actually greater at higher solar angles (closer to 90 degrees) compared to lower solar angles (closer to 0 degrees). At higher solar angles, the solar beam covers a larger area due to the greater incidence angle, resulting in a larger spread of solar radiation. As the solar angle decreases and approaches 0 degrees, the solar beam becomes more concentrated and focused on a smaller area, leading to a higher intensity of solar radiation at that point.

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Answer:

3,033,276 J

Explanation:

The work can be calculated as

W = Fd

Where F is the force and d is the distance.

Replacing F by 29,738 N and d by 102 m, we get:

W = (29,738 N)(102 m)

W = 3,033,276 J

Then, it has done 3,033,276 J

a) The P-V diagram for the process is shown below:

      C

      |

      |   B (2V, 300 kPa)

      |   |

P     |   |

      |   |

      |   |

      |   |

      |   |

      |   |

      |   |

      |_ |________

          V (m³)

           A (V, 300 kPa)

b) The total work done is 600 KJ.

c) The change in internal energy of the gas during the entire process is 61.85 kJ.

a. The process can be divided into two steps:

Step 1: Expansion at constant pressure (process AB in the diagram)

Step 2: Heating at constant volume (process BC in the diagram)

b. The work done by the gas during the entire process can be calculated by the area under the P-V curve:

W = W_AB + W_BC

W_AB = P(V_B - V_A) = (300 kPa)(2V - V) = 600 kJ

W_BC = 0 (constant volume process)

W = 600 kJ

c. The change in internal energy of the gas during the entire process can be calculated using the first law of thermodynamics:

ΔU = Q - W

ΔU = Q_AB + Q_BC - W

Q_AB = mCpΔT = (2 kg)(2.5 kJ/kg.K)(50 K) = 250 kJ

Q_BC = mCvΔT = (2 kg)(0.75 kJ/kg.K)(273 K) = 410.85 kJ

ΔU = (250 kJ + 410.85 kJ) - 600 kJ = 61.85 kJ

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The packaging used in the beauty sector is less functional and more ornate.  The packaging waste generated by the cosmetics industry accounts for around 70% of all waste, or 20 billion units annually.

Thus, Lipstick, shampoo, and body wash are discarded after being used up. There is very little recycling. Currently, the oceans get 8 million tonnes of plastic annually and cosmetics.

Since plastic is not biodegradable, it will never decay. Instead, it disintegrates and fragments into miniscule sizes via a process called "photodegradation."  and cosmetics.

The length of this procedure varies based on the type of plastic used, from 100 to 500 years. The more hazardous and challenging it is to clean up, the smaller the plastic becomes.

Thus, The packaging used in the beauty sector is less functional and more ornate.  The packaging waste generated by the cosmetics industry accounts for around 70% of all waste, or 20 billion units annually.

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Radial component of the linear acceleration = 99.47 m/s^2

The diameter of the wheel, d = 51 cm

The radius, r = d/2 = 51/2 = 25.5 cm

r = 25.5/100 = 0.255 m

r = 0.255 m

At t = 1.1, first calculate the new angular velocity

The radial component of the linear acceleration is given as:

A calorie is defined as the amount of energy needed to raise the temperature of one gram of water one degree centigrade is True.

A calorie is a unit of energy. For historical reasons, two main definitions of "calorie" are widely used. A staple calorie, food calorie, or kilogram calorie was originally defined as the amount of heat required to raise the temperature of 1 kilogram of water by 1 degree Celsius (or 1 Kelvin). [1] [3] A small calorie or gram calorie is defined as the amount of heat required to cause the same increase in 1 gram of water, so 1 large calorie equals 1000 small calories.

In nutrition and food science, the term calorie and the symbol cal most often refer to large units. It is often used in publications and on package labels to describe the energy value per serving or weight of food, recommended caloric intake, metabolic rate, etc. Some authors recommend spelling calorie and symbol cal (both uppercase C).However, to avoid confusion, this convention is often ignored.

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Answer:

Negative

Explanation:

hope i helped

To raise the automobile with a hydraulic lift, a force of approximately 19,000 N must be applied to the piston.

In a hydraulic lift, the principle of Pascal's law is applied, which states that pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and the walls of its container. By utilizing this principle, a smaller force applied to a smaller piston can generate a larger force on a larger piston.

In this scenario, the force needed to lift the automobile can be calculated using the formula:

\(\frac{F_{1}}{A_{1}} =\frac{F_{2}}{A_{2}}\)

where \(F_{1}\) is the force applied to the piston, \(A_{1}\) is the area of the piston, \(F_{2}\) is the force generated on the larger piston (required to lift the automobile), and \(A_{2}\) is the area of the larger piston.

Given the radius of the shaft (small piston) as 0.08 m and the radius of the piston as 0.01 m, we can calculate the forces applied and generated as follows:

\(A_{1} = \pi (0.08)^2\\A_{2}= \pi (0.01)^2\)

\(\frac{F_{1}}{A_{1}} =\frac{F_{2}}{A_{2}}\)

Simplifying the equation and substituting the values, we can solve for \(F_{2}\):

\(F_{2}=\frac{F_{1}A_{2}}{A_{1}}\)

Plugging in the values, we find:

\(F_{2}=\frac{F_{1} \pi (0.01)^2 }{ \pi (0.08)^2} \\F_{2}= \frac{F_{1}\times 0.0001}{0.0064} \\F_{2}= 0.015625 \times F_{1}\)

Given that the mass of the automobile is 1520 kg and the acceleration due to gravity is \(9.8 \hspace m/s^{2}\), we can equate \(F_{2}\) to the weight of the automobile:

\(F_{2}= mg\\0.015625\times F_{1}= 1520\times 9.8\)

Solving for \(F_{1}\), we find:

\(F_{1}\approx \frac{1520\times 9.8}{0.015624} \\F_{1} \approx 19072 \hspace N\)

Therefore, a force of approximately 19,000 N must be applied to the piston in order to raise the automobile using the hydraulic lift.

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Answer:

necessary for the growth, development and repair of all body tissues. it's involved in many body functions, including formation of collagen, absorption of iron, the proper functioning of the immune system, wound healing, and the maintenance of cartilage, bones, and teeth.

Explanation:

Answer:

Vitamin C act as antioxidant which protect our cell from damaging caused by radicals.

The mass of the object attached to the spring is approximately 0.119 kg.

To determine the mass of the attached object using the spring, we can utilize Hooke's Law, which states that the force exerted by a spring is directly proportional to the displacement of the spring from its equilibrium position.

Hooke's Law can be expressed as:

F = k * x

Where:

F is the force exerted by the spring,

k is the spring constant, and

x is the displacement of the spring from its equilibrium position.

The frequency of the spring's motion (f) can be related to the mass (m) and the spring constant (k) using the equation:

f = (1 / (2π)) * √(k / m)

Rearranging this equation, we can solve for the mass:

m = (k / (4π² * f²))

Given:

Spring constant (k) = 3 N/m

Frequency (f) = 0.8 Hz

Substituting these values into the equation, we get:

m = (3 N/m) / (4π² * (0.8 Hz)²)

Calculating this expression:

m ≈ 0.119 kg

Therefore, the mass of the object attached to the spring is approximately 0.119 kg.

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The mass attached to the spring is approximately 0.238 kg.

To find the mass attached to the spring, we can use the formula for the angular frequency (ω) of a mass-spring system:

ω = √(k / m),

where ω is the angular frequency, k is the spring constant, and m is the mass.

Given:

k = 3 N/m (spring constant),

f = 0.8 Hz (frequency).

First, let's convert the frequency from Hz to radians per second (rad/s):

ω = 2πf = 2π(0.8) ≈ 5.03 rad/s.

Now, we can solve the formula for m:

ω = √(k / m),

m = k / ω^2,

m = 3 N/m / (5.03 rad/s)^2.

Calculating the value:

m ≈ 3 N/m / (5.03 rad/s)^2 ≈ 0.238 kg.

Therefore, the mass attached to the spring is approximately 0.238 kg.

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The statement that best describes the energy transformation that occurs when a person eats a sandwich to gain for a long hike is: Potential energy is transformed into kinetic energy.

The correct answer is option D.

When a person eats a sandwich to gain energy for a long hike, the energy transformation involves the conversion of chemical potential energy stored in the food into kinetic energy that the person can utilize for physical activity.

The sandwich, as a source of nutrients, contains stored chemical potential energy derived from the sun through the process of photosynthesis. When the person consumes the sandwich, the body breaks down the complex molecules present in the food, such as carbohydrates, proteins, and fats, through the process of digestion. This breakdown releases stored chemical energy in the form of molecules like glucose.

Once these molecules are absorbed into the bloodstream, they are transported to the body's cells, including muscle cells. Through the process of cellular respiration, the glucose molecules are further broken down in the presence of oxygen to release energy in the form of adenosine triphosphate (ATP), the primary energy currency of cells.

ATP provides the energy required for muscle contraction, allowing the person to engage in physical activity such as hiking. As the person moves, the potential energy stored in the food is converted into kinetic energy, enabling the muscles to generate mechanical work and propel the body forward.

In summary, the correct option is B as the energy transformation that occurs when a person eats a sandwich to gain energy for a long hike involves the conversion of potential energy stored in the food (chemical potential energy) into kinetic energy that is utilized by the body's muscles for movement and physical activity.

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The question probable may be:

Which statement describes the energy transformation that occurs when a person eats a sandwich to gain energy for a long hike?

A. Thermal energy is transformed into kinetic energy.

B. Kinetic energy is transformed into potential energy.

C. Thermal energy is transformed into potential energy.

D. Potential energy is transformed into kinetic energy.

Answer:

36.5 kJ

Explanation:

Energy by machine = energy to machine × efficiency

E = 52.1 kJ × 0.70

E = 36.5 kJ

Given that the velocity at any time t is

Also, the time interval is from t = 0 to t = 8 seconds

The position at time t = 0 s is s(0) = 1 m towards right of zero.

The initial time is t = 0 s, so the initial velocity will be

The final time is t = 8 s, so the final velocity will be

The average velocity will be

Thus, the average velocity is 14 m/s.

Part II:

The instantaneous velocity at time t =5 s will be

The instantaneous speed is the magnitude of instantaneous velocity.

Thus, the instantaneous speed will be 2 m/s.

Part III:

The particle will move towards the right when v(t) > 0

The time intervals will be

Thus, time intervals are t > 3 and t > 6 when the particle is moving towards the right.

Part IV :

The particle will move faster if the acceleration, a(t) > 0

The particle will slow down if the acceleration, a(t) < 0

So, first, we need to find the acceleration, it can be calculated as

For the particle moving faster,

For particle slowing down,

The total distance can be calculated as

Here, the negative symbol indicates it is towards the left from zero.

Answer:

independent variables are variables in mathematical modeling, statistical modeling and experimental science

Answer:

This statement is not true

Explanation:

Because The normal magnetic field line points out from the north magnetic pole and in from the south magnetic pole.

Answer:

false

Explanation:

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