Samples of different materials, A and B, have the same mass, but the sample of A is higher in density. Which statement could explain why this is so?

A. The particles that make up material A have more mass than the particles that make up material B

B. The particles that make up material B have more mass than the particles that make up material A.

C. The particles that make up material B are more closely packed together than the particles that make up material A.

D. The sample of material A has greater volume than the sample of material B.​

It's A

The number of joules per coulomb for 120-volt circuit is 120 joules/C.

The amount of energy transferred to each unit of charge is given by the voltage or potential difference between two points.

The unit of potential difference is the volt, which is equivalent to one joule per coulomb.

So if we have a 120-volt circuit, each coulomb of charge that flows between two points receives 120 joules of energy.

Energy per unit charge = Potential difference

= 120 volts

= 120 joules/coulomb

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Answer:

jello

Explanation:

it jiggles

The acceleration for the whole fall  = 6 m/s²

Since the object falls freely without being pushed, we are able to conclude it falls with constant acceleration.

As per the formula,

Acceleration = \(\frac{Final Velocity - Initial Velocity}{Total Time}\)

The Final Velocity of the space - mobile would be the total displacement it covered in the given time.

Final Velocity = 96/4 m/s

                       = 24 m/s

The Initial Velocity will be zero since as given in the image attached that the object falls freely with no external force.

Initial Velocity = 0/0 m/s

                        = 0 m/s

Total time taken = 4 sec

∴ Acceleration of the space - mobile = \(\frac{24-0}{4}\)

                                                              = 24/4 m/s²

                                                              = 6 m/s²

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Answer:

B. 123.96 grams

Explanation:

Answer:

2NH

Explanation:

did it on edg 2020

Answer:

2NH

Explanation:

It explains on edg.

the tangential and normal components of acceleration at any time t>0

\(a_t = 2\sqrt6t\\a_n = 2 - 2\sqrt6t\) and \((b*a).c = -33\)

To find the tangential and normal components of acceleration, we need to calculate the acceleration vector and then decompose it into its tangential and normal components.

The position vector r(t) is given as:

\(r(t) = t^2 i + (t^2 - 1) j + 2t^2 k\)

To find the acceleration vector, we differentiate the position vector twice with respect to time:

a(t) = d²r(t)/dt²

Differentiating each component separately, we get:

a(t) = (2i + 2j + 4k)

The acceleration vector is constant and independent of time.

The tangential component of acceleration, aₜ, can be obtained by projecting the acceleration vector onto the velocity vector. Since the velocity vector is the first derivative of the position vector, we have:

\(v(t) = \frac{dr(t}{dt} = 2t\^i + (2t)\^j + 4t\^k\)

The tangential component of acceleration is given by:

\(a_1 = \frac{(a(t) .v(t)) }{|v(t)|} \\=\frac{ (2\^i + 2\^j + 4\^k) . (2t\^i + (2t)\^j + 4t\^k)}{ |2t\^i + (2t)\^j + 4t\^k|}\)

Simplifying, we have:

\(a_t = \frac{(4t^2 + 4t^2 + 16t^2)}{\sqrt{(4t^2 + 4t^2 + 16t^2)}} \\= (2\sqrt6t)\)

The normal component of acceleration, aₙ, can be obtained by subtracting the tangential component from the total acceleration

Therefore, the tangential and normal components of acceleration are:

\(a_t = 2\sqrt6t\\a_n = 2 - 2\sqrt6t\)

Now, let's move on to the second part of the question.

Given \(a*b = -2\^i + 4\^j - 7\^k\),  we need to find \((b*a).c\).

First, let's calculate b×a:

\(b*a = -a*b\\= 2i - 4j + 7k\)

Next, let's find \((b*a).c\):

= 2(3) + (-4)(1) + 7(-5)

= 6 - 4 - 35

= -33

Therefore, . \((b*a).c = -33\)

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protein channels play a critical role in the movement of solutes across cell membranes. Their specific composition and function allow for the selective movement of certain molecules or ions, which is necessary for proper cellular function.

1. Chart comparing the composition of the intracellular fluid and extracellular fluid Intracellular Fluid Extracellular Fluid Water Water Protein ions (K+, Mg2+, Na+, Ca2+, Cl-)Protein ions (K+, Mg2+, Na+, Ca2+, Cl-) Glucose Glucose Fatty acids Fatty acids Urea Urea Carbon dioxide Carbon dioxide Sodium, potassium, and chloride ionsSodium, potassium, and chloride ions

2. Importance of protein channels in the movement of solutesProtein channels are embedded in cell membranes, allowing for the movement of solutes across the membrane.

Protein channels are made up of proteins that are folded in a specific way, allowing them to act as tunnels that allow the movement of specific molecules or ions across the membrane.

The protein channels act as gatekeepers, ensuring that only certain molecules or ions can enter or exit the cell.There are different types of protein channels that perform different functions, such as allowing for the movement of water, ions, or larger molecules like glucose. These channels are critical to maintaining the proper balance of solutes inside and outside of cells, which is necessary for proper cellular function.

For example, the movement of sodium and potassium ions across the cell membrane is necessary for proper nerve function. If these ions are not able to move across the membrane due to a malfunctioning protein channel, it can lead to neurological disorders or diseases. Protein channels are also important in the movement of glucose, which is necessary for energy production in cells. Without proper glucose transport, cells cannot produce enough energy to carry out their functions.

In conclusion, protein channels play a critical role in the movement of solutes across cell membranes. Their specific composition and function allow for the selective movement of certain molecules or ions, which is necessary for proper cellular function.

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Answer:

500 Newtons

Explanation:

50 kg x 10 m/s squared

Answer:

Aluminium is just on the metal side of the border between metals and metalloids, so it is not considered to be a metalloid

Explanation:

it is a metal

Answer:

Aluminum-(Al) is a metal

Photographs in a book or magazine may look grainy when magnified because the small dots or pixels that make up the image become more visible when enlarged. These small dots or pixels are what create the image and when magnified, they become more visible and may appear grainy or pixelated. Additionally, the printing process and paper quality of the book or magazine may also affect the sharpness and clarity of the image when magnified.

When photographs in a book or magazine look grainy when magnified, it is due to the printing process and the resolution of the image. Here's a step-by-step explanation:
1. Printing process: Books and magazines typically use a printing method called halftone, which represents images using tiny dots of ink. These dots are arranged in a pattern to create the illusion of continuous tones and shading.
2. Magnification: When you magnify a printed photograph, the individual dots become more visible, making the image look grainy.
3. Resolution: The resolution of the image also plays a role. If the original photograph has a low resolution, the printed version will have less detail and look more grainy when magnified.
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The size of the breaker for a 120 volt water heater depends on the wattage of the heater and the amperage required to power it, typically a 15-amp breaker is used for a 1500W water heater.

To determine the correct breaker size, you need to divide the wattage of the heater by the voltage it operates on (120V) to get the amperage required.

For example, if your water heater has a wattage of 1500W, the amperage required would be:

Amperage = Wattage / Voltage

        = 1500W / 120V

        = 12.5A

In this case, you would need a 15-amp breaker to safely power the water heater.

It's important to choose a breaker that is rated for the amperage required by the water heater to prevent electrical overloading and potential damage to the wiring or electrical system.

It's always a good idea to consult with a licensed electrician to ensure that the breaker and wiring are installed correctly and meet local building codes and safety requirements.

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This is how you calculate his speed, for the 100metres. That is, the average speed for the entire distance, including the start from intertia until the race end where the athlete is decelerating. Multiply the time by 10, and divide 3600 by that figure. i.e. 10 by10 equals 100. Divide 3600 by 100 and you get 36 which is the speed figure you requested.

A female athlete ran 200 metres a few years ago and in the middle section of the race covered 100 metres in that race in a time under 10 seconds. That is, she ran a sub 10second 100metres from a flying start. This great athlete from Slovenia, also ran a 100 metre race (from a stationary start) in a time under 11 seconds, when she was 48 years of age. Her name is Merlene Ottey.

The sound would have a wavelength of about  9.8 * 10^-3 m.

The wavelength is a characteristic of a wave that describes the distance between two successive points in the wave that are in phase, or the distance over which the wave's shape repeats. It is typically denoted by the Greek letter lambda (λ) and is measured in meters (m) or other units of length.

Given that the speed of sound in air is 343 m/s

v= λf

λ = v/f

λ =  343 m/s/3.5x10^4 Hz

λ =  9.8 * 10^-3 m

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Explanation:

centripetal force is a force that makes a body follow a curved path. for example, twirling,a lasso, cream seperator etc.

A force that causes an objectmoving in a circular path to move out and away from the centres of it's path is centrifugal force. for example,drifting, banked roads, washing machine etc.

Circular motion is a movement of an object along the circumference of a circle or rotation along a circular path. for example, stirring batter, stone tied to a string etc

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When you compare very hot objects to much cooler objects, the blackbody curves change in two ways, as follows:

1. The peak of the curve shifts towards shorter wavelengths (higher frequencies)

2. The amount of energy released increases, and the curve's area increases. This is due to the fact that hotter objects emit more energy per unit surface area than cooler objects. When the temperature of an object is increased, the radiation it emits shifts toward the higher frequency end of the electromagnetic spectrum, resulting in a shift toward the blue/violet end of the spectrum.

A blackbody is an idealized physical object that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. The blackbody curve is a graph that depicts the wavelength and intensity of radiation that a blackbody radiates at various temperatures. A blackbody curve shows the quantity of radiation emitted by a blackbody at each wavelength at a specific temperature.

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This is because the pressure inside the giant planet is very high. Jupiter, Saturn, and Neptune all radiate more energy into space than they receive from the Sun.

High enough pressure to prevent water from evaporating. Planets have bands in their atmospheres like Jupiter and Saturn when:

Wind speeds vary greatly with latitude. The Jupiter planet draws heat from the Sun and from within. Jupiter generates a large amount of heat internally and emits thermal radiation to dissipate that heat. In fact, Jupiter produces so much internal heat that it emits almost twice as much energy as it receives from the Sun. Larger gas and ice giants tended to form farther from the Sun because regions closer to the Sun were too warm for light gases to condense there.

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The position of the image is 35 cm from the concave mirror, the size of the image is approximately 1.944 cm, and the nature of the image is upright.

To determine the position, size, and nature of the image formed by a spherical mirror, we can use the mirror formula:

1/f = 1/v - 1/u

where:

f is the focal length of the mirror,

u is the object distance (distance of the object from the mirror),

v is the image distance (distance of the image from the mirror).

Given data:

f = -12 cm (negative sign indicates a concave mirror)

u = -36 cm (negative sign indicates that the object is located on the same side as the incident light)

h = 2 cm (height of the object)

Substituting the values into the mirror formula, we have:

1/-12 = 1/v - 1/-36

Simplifying the equation:

-1/12 = (36 - v)/36

-1/12 = (36 - v)/36

-1 = 36 - v

v = 36 - 1

v = 35 cm

The positive value for v indicates that the image is formed on the opposite side of the mirror from the object.

To find the size of the image, we can use the magnification formula:

magnification (m) = -v/u

Substituting the values:

m = -35/-36

m ≈ 0.972

Since the magnification is positive, it indicates an upright image.

The size of the image can be determined using the magnification formula:

m = image height (h')/object height (h)

0.972 = h'/2

h' ≈ 1.944 cm

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Answer:

\(the \: net \: force = \: 50 - 15 = 35.\)

Answer:

Net force is going to be GREATER FORCE - LESS FORCE if they are working in opposite direction

so,

         50N - 15N = 35N

The current on the insulating rod, which carries a positive charge and is placed near an electroscope on a table, is zero. Insulating materials, such as the rod in question, do not allow the flow of electric charge or current through them. Therefore, despite the presence of a positive charge on the rod, there is no movement of charges to generate a current.

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Answer:

Definition of envelop

transitive verb

1: to enclose or enfold completely with or as if with a covering

2: to mount an attack on (an enemy's flank)

Explanation:

To solve this problem, we can use the following formula for the distance (d) required to stop a car with uniform acceleration:

d = (v^2 - u^2) / (2a)

where v is the final velocity, u is the initial velocity, and a is the acceleration.

We are given that the car stops with uniform acceleration after its brakes are applied at a velocity of 80 mi/h and takes 400 ft to stop. Therefore, we can find the acceleration (a) as follows:

d = (v^2 - u^2) / (2a)

400 = (0 - 80^2) / (2a)

a = 6400 / (2 * 400)

a = 8 mi/h^2

We can now use this value of a to find the distance required to stop the car when its initial velocity is 40 mi/h.

Using the formula again, we get:

d = (v^2 - u^2) / (2a)

d = (0 - 40^2) / (2 * 8)

d = 800/16

d = 50 feet

Answer:

Therefore, the car will take 50 feet to stop under the same conditions when its initial velocity is 40 mi/h.

A variable that the researcher controls is an independent variable.

In experimental research, the independent variable is manipulated or changed by the researcher to observe its effect on the dependent variable. The independent variable is the presumed cause or influence on the dependent variable. It is called "independent" because its value or level is not dependent on any other variable in the study.

For example, in a study investigating the effect of different teaching methods on student achievement, the teaching method would be the independent variable. The researcher can control and manipulate the teaching method by assigning participants to different groups that receive different instructional approaches. The dependent variable, in this case, would be the student achievement, which is measured to determine the impact of the different teaching methods.
By controlling the independent variable, researchers can establish a cause-and-effect relationship between the independent and dependent variables. This allows them to draw conclusions about the effects of the independent variable on the dependent variable. The manipulation of the independent variable provides researchers with control over the research design, allowing them to test specific hypotheses and draw meaningful conclusions from their studies.

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Answer:

Explanation:

57.8 m/s

Answer:

13

Explanation:

The devices used to measure radioactivity include ionization counters and scintillation counters. Particle accelerators and linear accelerators are not used specifically for measuring radioactivity but for other purposes related to high-energy particles.

1. Ionization counters, such as Geiger-Muller counters, detect radioactivity by measuring the ionization of gas caused by radioactive particles.

2. Scintillation counters use scintillation materials that emit light when struck by radiation, allowing the measurement of radioactivity based on the detected light pulses.

3. Particle accelerators are used to accelerate charged particles to high speeds for various scientific experiments and research but are not primarily used for measuring radioactivity.

4. Linear accelerators are used in medical settings for radiation therapy but do not directly measure radioactivity. They generate high-energy radiation beams for cancer treatment.

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Thermal energy storage means heating or cooling a medium to use the energy when it is needed later, for example, using a water tank to store heat, where the water is heated when there is a lot of energy, and the energy is then stored in the water for use when the energy is less.

Thermal energy is the energy possessed by the system which is responsible for its temperature rise and fall. Heat is the flow of thermal energy.

Phase-change material (PCM) such as wax, molten salts can be  more useful for storing thermal energy.

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To answer this question, we need to use the equation for sliding friction. Sliding friction is the force that opposes the motion of a box or an object that slides across a surface.

The equation for sliding friction is:f = μNwhere:f is the force of sliding friction,μ is the coefficient of sliding friction, andN is the normal force between the box and the surface on which it is sliding.We can use this equation to find the coefficient of sliding friction when we know the force required to move the box at a constant rate.Let's use the values in the question to find the coefficient of sliding friction:

f = μNf = 6.0 N (the force required to drag the box at a constant rate)N = 18 N (the weight of the box)μ = f/Nμ = 6.0 N / 18 Nμ = 0.33 (rounded to two decimal places)

Therefore, the coefficient of sliding friction is 0.33. This means that the force of sliding friction is 0.33 times the normal force between the box and the surface. This also means that it takes more force to move the box than it does to keep it moving at a constant rate.

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Cold TCS food should be stored at an internal temperature of

41° F or below.

TCS full form is Time/Temperature Control for Safety. Foods that typically spoil more quickly than other foods are referred to as TCS. These foods may either have a high initial microorganism load naturally or possess qualities that are ideal for the growth of pathogens.

The TCS food definition makes it clear that any time and temperature control has a significant impact on the foods that fall under this category. Food handlers may find it extremely beneficial to know how TCS foods behave in order to better formulate, prepare, and serve their food products to consumers. In order to avoid causing foodborne illnesses and food waste, this task is a crucial duty of both food managers and food handlers.

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Answer:

2100 m

2804 g

4 '2 mm squares'

20,000 photos

Explanation:

1.5 km = 1500 m

1500 m + 600 m = 2100 m

2.8 kg = 2800 g

2800 g + 4 g = 2804 g

8mm tube / 2 mm squares

4 can fit

1 Gb = 1000 mb

40 Gb = 40,000 mb

40,000 mb / 2 mb = 20,000 photos

Here's all the help you need:

1).  1 km  =  1,000- m

2).  1 kg  =  1,000 g

3).  Freebie.  2 fits into 8 four times.

4).  1 mega...  =  1,000 kilo...

5).  1 Giga...  =  1,000 Mega...

Answer:

Mass

Explanation: