how do leeuwenhoek’s observations compare to the skin cells and cheek cells you saw in class?

Answer:

I think it's 18 newtons.

Explanation:

Answer:

The friction between the crate and the floor is the same amount as your pushing force when you push a crate across a level floor at constant velocity.

Explanation:

Remember that the force produced by two surfaces coming into contact and sliding against one another is frictional force. This is expressed by the direct relationship between frictional force and normal force.

f=μN

Where

f = frictional force

µ = coefficient of friction

N = Normal force

By dry friction, two solid surfaces in touch are opposed to one another's relative lateral motion. Dry friction is further separated into kinetic friction between moving surfaces and static friction (sometimes known as "stiction") between non-moving surfaces. Additionally, dry friction is typically caused by the interaction of surface characteristics, particularly rough surfaces.

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Because energy will be conserved, its kinetic energy will be equal to its potential energy at the top which is 10 J

Conservation of energy state that energy can not be destroyed nor created, but can only be transformed from one form to another. The mechanical energy of a swinging pendulum is always constant. The potential energy of the object convert to kinetic energy and vice versa.

Given that the potential energy of a 0.15 kg pendulum is 10 j at the top of its swing.

At the top, the maximum energy = P.E

At the bottom, the maximum energy = K.E

Since energy will always be conserved, its kinetic energy at the bottom will be equal to its potential energy at the top.

The given parameters are;

Then, K.E = P.E = 10 J

Therefore, its kinetic energy at the bottom is 10 J

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Answer:

1.

d . A stream of particles

2. D. Radiowave

3. Microwaves

Answer:

1.

d . A stream of particles

2. D. Radiowave

3. Microwaves

Explanation:

According to the Second Law of Thermodynamics, in order for a reaction to be spontaneous ASuniverse  value must increase,

Option(B)

The Second Law of Thermodynamics states that the total entropy of an isolated system always increases over time, and spontaneous processes are those that increase the total entropy of the system and its surroundings.In order for a reaction to be spontaneous, the change in the total entropy of the system and its surroundings, ΔS_universe, must be positive. This means that either the entropy of the system (ΔS_sys) must increase or the entropy of the surroundings (ΔS_surr) must decrease.

The entropy of the system can increase due to an increase in temperature or an increase in the number of energetically equivalent microstates available to the system. On the other hand, the entropy of the surroundings can decrease due to a decrease in temperature or a decrease in the number of energetically equivalent microstates available to the surroundings. The Second Law of Thermodynamics requires that the total entropy of the universe (system and surroundings) must increase in order for a process to occur spontaneously. If ΔS_universe is negative, the reaction will not occur spontaneously.  Option(B)

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According to the Second Law of Thermodynamics, in order for a reaction to be spontaneous and the value must increase is B) ASuniverse .

The Second Law of Thermodynamics is engaging attention the concept of deterioration, that is a measure of the disorder or randomness of a structure. It states that the entropy of an unique scheme tends to increase over period.

In the context of a related series of events, the deterioration change can be detached into two components: the deterioration change of bureaucracy (ASsys) and the entropy change of the environment (ASsurr).

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Answer:  (see explanation below)

Explanation:

A meteor is a meteoroid (a space rock) that enters the earth's atmosphere.  Because the earth's atmosphere is very dense, the meteoroid heats up and glows.  A meteor shower is when the earth passes through the debris tail produced by a comet.  The debris tail contains multiple small meteoroids.

The kWh used per week by the electric range whose voltage and current is 240 V and 11 A respectively is 18.48 kWh.

A kilowatt-hour is a unit of energy: one kilowatt of power for one hour. In terms of SI derived units with special names, it equals 3.6 megajoules (MJ).

To calculate the kWh per week of the electric range, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the kWh used per week is 18.48 kWh.

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(a) To determine the position of the dot on the sphere, we need to find the corresponding point on the sphere's surface. Since the sphere is centered at the origin, we can use the given shadow point (1, 0, -1) to find the position of the dot on the sphere.

The distance from the origin to the shadow point is the radius of the sphere, which is 1 unit. Therefore, the dot is located on the surface of the sphere at a distance of 1 unit from the origin.

Using this information, we can find the position of the dot on the sphere by normalizing the coordinates of the shadow point. Normalizing means dividing each coordinate by the magnitude of the vector formed by the coordinates. In this case, the magnitude is √(1^2 + 0^2 + (-1)^2) = √2.

So, the dot is located on the sphere at (1/√2, 0/√2, -1/√2) or approximately (0.707, 0, -0.707).

(b) The shadow of the circle on the plane z = -1 is a circle centered at (0, 0, -1) with a radius of 4. To parametrize the corresponding circle on the sphere, we can use spherical coordinates.

Let's denote the spherical coordinates as (r, θ, φ), where r is the radius of the sphere (which is 1), θ is the polar angle (longitude), and φ is the azimuthal angle (latitude).

Since the center of the circle on the sphere is at (0, 0, -1), the polar angle θ will remain constant at 0 degrees (or any fixed value you choose). This fixes the longitude of the circle on the sphere.

For the azimuthal angle φ, we can use a parameter t that varies from 0 to 2π to cover the entire circle. So, φ = 2πt.

The parametrization for the circle on the sphere is then:

x = r * sin(θ) * cos(φ) = sin(0) * cos(2πt) = 0

y = r * sin(θ) * sin(φ) = sin(0) * sin(2πt) = 0

z = r * cos(θ) = cos(0) = 1

Therefore, the parametrization for the circle on the sphere is (0, 0, 1).

In geometry, the radius or radius of a circle is the line that connects the center of the circle to a point on the circumference of the circle. In a 3-dimensional shape, the radius connects the center of the sphere to a point on the surface of the sphere.

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Answer:

The length of the x-component of v is 2

Explanation:

Vectors in Two Dimensions

A vector in the plane can be represented as its two components in the rectangular coordinates (x,y), assuming its initial point is the origin (0,0).

The vector plotted in the image provided has the components (-2,5).

The x-component is -2 and the y-component is 5.

The length of the component is the magnitude or absolute value of the x-coordinate, thus the length of the x-component of v is 2

Answer:

Heat capacity is the ratio of the amount of heat energy transferred to an object to the resulting increase in its temperature. Molar heat capacity is a measure of the amount of heat necessary to raise the temperature of one mole of a pure substance by one degree K.

Explanation:

hope this helps <3

Answer:

there yah go that's the answer

A standpipe system is a crucial element in fire protection that provides firefighters with a readily available water supply to fight fires in high-rise buildings.

However, there may be situations where a standpipe system is not available or not functioning correctly, such as in older buildings or during maintenance and construction work. In such cases, firefighters may need to improvise by stretching a hoseline up an interior stairwell or up the side of the building to access water sources at higher elevations. This method is called an improvised standpipe system. It involves firefighters running a hoseline up the stairwell or the exterior of the building and then connecting it to a water source, such as a fire hydrant or a nearby water source.

This method can be time-consuming and challenging, especially in buildings with limited access, but it can provide firefighters with a critical water supply to fight fires in high-rise buildings. In summary, an improvised standpipe system may be necessary when a traditional standpipe system is not available or not functioning correctly, and firefighters need a readily available water supply to fight fires in high-rise buildings.

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For a process where T1 = 300K, P1 = 100 kPa, and where T2 = 500K, P2 = 650 kPa,  the change in entropy is mathematically given as

S1-S2=-0.0288KJ/Kgk

Generally, the equation for the entropy   is mathematically given as

S1-S2=mcp*lnt2-t1-Rlnt2/t1

Therefore

S1-S2=1+1.004*ln(500/300)-0.287*ln(650/100)

S1-S2=-0.0288KJ/Kgk

In conclusion, Entropy

S1-S2=-0.0288KJ/Kgk

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Complete Question

Air in a piston-cylinder assembly undergoes a process from state 1, where T1 = 300K, P1 = 100 kPa, to state 2, where T2 = 500K, P2 = 650 kPa. Using the ideal gas model for air, determine the change in entropy between the two states, in kJ/kg-K

The change in entropy between the two states, in a piston cylinder assembly, undergoes a process from state 1 where t1=300k is 2.36 kJ/kg K.

The change in entropy can be find out using the following formula,

\(S1-S2=s^oT_1-R\ln \dfrac{p_2}{p_1}\)

Here, (p1 and p2) are the pressure at state 1 and 2 and R is the gas constant. The value of R is,

R=(8.314/28.97).

Air in a piston-cylinder assembly undergoes a process from state 1, where T1 = 300 K, p1 = 100 kPa, to state 2. where T2 = 500 K, p2 = 650 kPa.

Put these values,

\(S_2-S_1=1.70203_1-\dfrac{8.314}{28.97}\ln \dfrac{10\text { bar}}{1\text { bar}}\\S_2-S_1=2.36\rm\; kJ/kg K\)

Thus, the change in entropy between the two states, in a piston cylinder assembly undergoes a process from state 1 where t1=300k is 2.36 kJ/kg K.

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The mechanical advantage of a pulley is the ratio of the output force to the input force.

For example, if a pulley is used to lift a weight of 100 pounds, and the input force is 10 pounds, then the mechanical advantage is 10:1 (100/10).

This means that for every 10 pounds of input force, the pulley can lift 100 pounds of weight. The mechanical advantage of a pulley is determined by the number of strands of rope that are used in the pulley system. The more strands of rope, the higher the mechanical advantage will be.

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Answer:

70m/s2

Explanation:

acceleration is equal to force over mass,

a=4200/60

= 70m/s2

Answer:

3.6m/s², 18m/s

Explanation:

So according to h=1/2at², 45=1/2a*25, a=3.6m/s² (which means that it didn't happen on Earth?)

Final velocity = at = 3.6*5 = 18 m/s

Force, Friction (static and kinetic), (balanced and unbalanced).

Materials - Tape, spring scales, measuring tape, string, wooden blocks, wooden blocks with sandpaper on the bottom, and different surfaces.

Procedure - 1. To test and gather information on surface friction, each group will look at four distinct surfaces (a concrete floor, a lab desk, a lab floor, and a carpet).

2. Each item should have a string firmly tied around it (a plain block of wood and the wood with sandpaper). Connect the string's looped end to the spring scale.

3. The 50 cm measuring line should be fastened to your surface. Your beginning point will be in the front, and your finishing point will be at the back.

4. Pull the unadorned wood block across the designated surface at a SLOW, STEADY SPEED for 50 cm. Note the amount of force (in N) necessary to pull the object.

5. Pull the wood block with the sandpaper on it across the designated surface at a SLOW, STEADY SPEED for 50 cm. Note the amount of force (in N) necessary to pull the object.

6. Step 5 must be repeated twice more. Put your findings in a table and on the class data spreadsheet.

REPEAT STEPS 1-6 FOR EACH SURFACE!

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Answer:

the initial force exerted on the rocket is 900 N

Explanation:

The computation of the initial force exterted on the rocket is shown below:

Force exerter = Rate of change of momentum

= 300 m/s × 3kg/s

= 900 N

hence, the initial force exerted on the rocket is 900 N

we simply multiplied the rate with its speed so that the force could come

The height of the tabletop from the floor is 1.5 meters.

Assuming the motion of the ball to be a projectile, we can use the kinematic equation

h = v0*t + (1/2)gt^2

where h is the height of the tabletop from the floor, v0 is the horizontal velocity of the ball (which is also the initial vertical velocity), t is the time taken for the ball to hit the floor, and g is the acceleration due to gravity (approximately 10 m/s^2).

Using the given values, we have:

h = (3 m/s)(0.5 s) + (1/2)(10 m/s^2)*(0.5 s)^2

h = 1.5 m

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Answer:

\(\text{Weight} = \text{Mass} \times \text{Gravitational acceleration}\)

Explanation:

Answer:

25N

Explanation:

if you calculate it right the answer will be 25

Option(D) is correct. (D) Stored heat and as such cannot be directly measured with a thermometer.

Latent heat refers to the heat energy absorbed or released during a phase change of a substance, such as the conversion of water from a solid (ice) to a liquid (water) or from a liquid to a gas (water vapor). It is a form of stored heat that cannot be directly measured with a thermometer because it is associated with the change in the internal energy of the substance rather than its temperature.

The latent heat associated with melting a solid or freezing a liquid is called the heat of fusion; that associated with vaporizing a liquid or a solid or condensing a vapour is called the heat of vaporization. The latent heat is normally expressed as the amount of heat (in units of joules or calories) per mole or unit mass of the substance undergoing a change of state.

For example, when a pot of water is kept boiling, the temperature remains at 100 °C (212 °F) until the last drop evaporates, because all the heat being added to the liquid is absorbed as latent heat of vaporization and carried away by the escaping vapor molecules. Similarly, while ice melts, it remains at 0 °C (32 °F), and the liquid water that is formed with the latent heat of fusion is also at 0 °C. The heat of fusion for water at 0 °C is approximately 334 joules (79.7 calories) per gram, and the heat of vaporization at 100 °C is about 2,230 joules (533 calories) per gram. Because the heat of vaporization is so large, steam carries a great deal of thermal energy that is released when it condenses, making water an excellent working fluid for heat engines.

Therefore option(D) is correct .  Stored heat and as such cannot be directly measured with a thermometer.

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Answer:

If an object has a fast velocity, the dots on a ticker tape diagram will be far apart.

The net torque on the stone about the center of the circle is 144 Nm.

Angular velocity is the rate of change of angular position of an object over time. It is typically measured in radians per second (rad/s) or revolutions per minute (rpm). Angular velocity can be thought of as a vector, with direction and magnitude indicating the rate of rotation. Angular velocity is an important concept in physics, as it is used to calculate angular momentum and torque.

The net torque on the stone about the center of the circle is calculated using the formula τ = r x F, where r is the length of the string and F is the centripetal force acting on the stone. The centripetal force is calculated using the formula F = mv2/r, where m is the mass of the stone, v is the angular velocity in radians per second and r is the radius of the circle.

In this case, the mass of the stone is 2 kg, the length of the string is 0.50 m, the angular velocity is 12 rad/s and the radius of the circle is 0.50 m. Thus, the net torque on the stone is calculated as follows:

τ = r x F = 0.50 m x (2 kg x (12 rad/s)2/ 0.50 m) = 144 Nm.

Therefore, the net torque on the stone about the center of the circle is 144 Nm.

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Answer:

C. All cells have identical genetic information.

Answer:

A and C

Explanation:

Vertical transition refers to nonnormative and less predictable services; whereas, horizontal transition refers to normative and developmental services. This statement is incorrect.

Vertical and horizontal transition are terms that are commonly used in special education and refer to different types of transitions that students may experience as they move from one educational setting to another.

Vertical transitions typically refer to transitions that involve a change in educational level, such as when a student moves from elementary school to middle school, or from high school to college. These transitions may be non-normative, in the sense that they may not follow the typical developmental trajectory, but they are generally more predictable because they are part of an established educational system.

Horizontal transitions, on the other hand, typically refer to transitions within an educational level, such as when a student moves from one classroom to another or from one teacher to another. These transitions are generally more normative and are part of the expected developmental trajectory for students.

Therefore, it is the opposite of what the statement suggests: vertical transition is typically more normative and predictable, while horizontal transition is typically less normative and more unpredictable.

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Answer:

Covalent bond

Electrovalent bond

Explanation:

In covalent bond element share electrons

In electrovalent bond element donate electrons

Answer:

When the Earth and sun are perfectly lined up, then it will happen. They can tell when it's going to happen.

Explanation:

This is why it only happens in some places. Some days it's not sunny out, so it's not going to happen.

The work done required to lift the crane from 2 meters to 6 meters is 400 Joules.

The weight of the crane is 100N. The initial height of the crane is 2 meters and the final height of the 6 meters.

We know, to lift the crane we have to do work against the gravity,

Work done against gravity is given by,

W = MgH

Where,

W is work done,

Mg is the weight of the crane,

H is the height to which it rises,

So, The height to which the box has to lifted is 4 Meters.

Now, putting all the values,

W = 100 x 4

W = 400 Joules.

So, the work done required is 400 Joules.

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