How much work is done if you push a 200 N box across a floor with a force of 50 N for a distance of 20m

I would say the answer is D

A hygrometer is an instrument used to measure relative humidity. ... To determine the relative humidity, the temperatures are taken from the dry-bulb thermometer and the temperature difference between the wet and dry bulb thermometers.

hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere. There are two main types of hygrometers -- a dry and wet bulb psychrometer and a mechanical hygrometer.

The correct answer is D) relative humidity, and a sling psychrometer measures this by comparing the temperatures obtained from a wet and a dry thermometer.

A device that uses the wet/dry bulb method to measure the relative humidity is the sling psychrometer. This device consists of two thermometers, with one being the dry bulb and the other being the wet bulb. The difference in temperature readings between these two allows individuals to determine the relative humidity using a psychrometric chart, which requires a knowledge of the temperature at which air becomes saturated with water vapor (dew point) as well as other related properties of moist air.

The wet-bulb temperature is particularly important in industries such as textile, wood, and chemical processing, where humidity control is crucial. With the use of a psychrometric chart, these measurements enable precise control over the environmental conditions in plant production facilities and other industrial processes.

Answer:i think the answer is c but monomers are found in anything that has dna in it and almost everything does.

Explanation:

Answer:

C) Nucleotides

Explanation:

Answer:

Wavelength is 0.5

Explanation:

To work it out, you divide Wave speed by the Frequency (24÷48=0.5)

Answer:

wavelength = 0.5 meters

Explanation:

Wavelength is the distance between successive trough or crest of a wave. Wavelength is inversely proportional to frequency.  This means the shorter the wavelength the higher the frequency .The S.I unit of wavelength is meters.

Wavelength can be represented with a Greek symbol known as lambda (λ).

The formula below can be use to represent wavelength .

λ = v/f

where λ = wavelength

v = velocity

f = frequency

v = 24m/s

f = 48 Hertz

λ  = 24/48

λ  = 0.5meters

Are there supposed to be multiple choices for this question?

Answer: water some food ALOT of FUNNN!!! and you'll live you also need the big guy up there

^

Answer:

Lowest

Explanation:

Law of superposition

The correct answer is A) lowermost.

The principle of superposition states that in an undisturbed sequence of sedimentary rocks, each layer is younger than the one below it and older than the one above it.

This means that the oldest fossils would be found in the lowermost layer of sedimentary rock, as it was deposited first. Over time, newer layers of sediment accumulate on top, preserving the older layers and the fossils they contain.

Therefore, the oldest fossils would be located in the oldest layer, which is the lowermost one. Options B, C, and D would contain progressively younger fossils, with the uppermost layer containing the youngest fossils.

The stratosphere (option C) is not a layer of rock but rather a layer of Earth's atmosphere, making it an incorrect choice for finding fossils."

Answer:

Although graphite and diamond are both composed of carbon atoms, their physical properties are very different. The differences are the result of the atomic structures of the minerals. In graphite the carbon atoms are arranged in layers. As a result, graphite is soft. The great hardness of diamond is the result of the bonds that hold carbon atoms in a network structure.

Explanation:

Answer:

B

Explanation:

This option is exactly the same as the example. Thus it would require the same amount of heat.

Answer:

B) A 3-kg mass experiences a temperature rise of 50°C.

Explanation:

As we know that the rise in temperature for 3 kg object is 50 degree C then the heat added is given as 1000 J

so here we can say that formula of heat is

[tex]Q = ms\Delta T[/tex]

here we will have

[tex]m = mass[/tex]

s = specific heat capacity

[tex]\Delta T [/tex] = temperature rise

so here if we make all three parameters same to make this heat energy same

so correct answer will be

B) A 3-kg mass experiences a temperature rise of 50°C.

Answer:

A. All cells come from pre-existing cells

Explanation:

Francesco Redi's experiments aimed to test spontaneous generation, where life could emerge from non-living things. His first round included two groups of jars with raw meat in it. He covered one group with a thin cloth, allowing only air to get in, and the other group was left open.

In the jars left open, he noted maggots were present and the one that was covered contained no maggots.

The results indicated that the maggots only formed because flies laid their eggs on it and maggots developed. He did note that some maggots developed on the cloth itself, but on the outside.

Thus, he contributed in disproving spontaneous generation by showing that maggots only developed from the eggs that flies laid. This supports that all cells come from pre-existing cells.

Answer:

A)

Explanation:

The freezing point of a substance in a cooling curve can be determined at the temperature where the substance transitions from its liquid phase to its solid phase. The freezing point may, however, be depressed in the presence of solutes. Freezing point depression is one of the colligative properties that depend on the quantity of solute particles rather than their identity.

The freezing point of a substance in a cooling curve can be determined at the point where the substance begins to transition from its liquid phase to its solid phase. The freezing point represented on the cooling curve is the temperature at which this phase transition occurs. For instance, pure water freezes at 0 °C (32 °F) under normal atmospheric pressure.

In some cases, this freezing point may vary, e.g., the freezing point of benzene is 5.5 °C. For a solution, the freezing point might be lower due to the presence of solutes; this is known as the freezing point depression. In other words, substances such as salt or sugar when mixed with water lower its freezing point, a concept used in daily life, such as making homemade ice cream or de-icing roads in winter.

For example, a solution of benzene and HCl showed a freezing point depression (ΔTf) of 5.1 °C, implying that the freezing point of the solution was lower than the pure solvent. Therefore, the freezing point of a substance can be approximated using cooling curves, considering other properties such as pressure and presence of solutes.

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Answer:

1225 J

Explanation:

The Gravitational potential energy (PEG) gained by a mass lifted above the ground is given by

[tex]PE=mgh[/tex]

where

m is the mass

g = 9.8 m/s^2 is the acceleration due to gravity

h is the height at which the object has been lifted

In this problem, we have

m = 250 kg

h = 0.5 m

So, the PE of the object is

[tex]PE=(250 kg)(9.8 m/s^2)(0.5 m)=1225 J[/tex]

Answer:

1225J

Explanation:

The Gravitational potential energy (PEG) gained by a mass lifted above the ground is given by

where

m is the mass

g = 9.8 m/s^2 is the acceleration due to gravity

h is the height at which the object has been lifted

In this problem, we have

m = 250 kg

h = 0.5 m

So, the PE of the object is

1225J

Answer: Streptococcus.

Explanation:

The Bacteria and Archaea domains are prokaryotes, they contain no nuclues or organelles, only a circular chromosome. They cannot form multicells organisms. Archaea can be found in extreme evironments, such as hot springs and deep sea vents.

Answer:

Because solar cell produces DC (Direct current) electricity.

Explanation:

Most of the appliances and the electricity grid works on the Alternating Current (AC) electricity. The solar cells produces DC which are not usable until that is converted into AC. For this purpose inverters are used which convert the DC to AC and thus making Solar energy usable for home appliances.

An inverter is necessary in a solar power system to convert the DC electricity produced by the solar panels into the AC electricity required for most electrical applications. Therefore solar cells need an inverter because their energy output is alternating current. Option A is the answer.

Solar cells, or photovoltaic (PV) cells, employ the photovoltaic effect to convert sunlight into direct current (DC) electricity. However, household and grid electricity systems mainly use alternating current (AC) due to its suitability for transmission and powering diverse appliances. Solar generated DC electricity needs conversion to AC through an inverter in solar power systems.

This device plays a crucial role by transforming the solar panel's DC output into the appropriate AC waveform and voltage level. This conversion ensures compatibility with the electrical grid and allows utilization by appliances and lighting.

Essentially, the need for inverters stems from solar cells' DC generation, contrasting with the prevalent AC based infrastructure and device requirements.

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Question

9. Why do solar cells need an inverter? Please explain.

A. Their energy output is alternating current.

B. They need a way to store energy for cloudy days.

C. They need a way to share their excess energy with the electric company.

D. Their energy output is direct current.

Answer:

7.0 m/s

Explanation:

The question is on Free-Fall

In a free fall, an object falls freely without only gravity acting on it. Velocity at the top is zero m/s

Height of fall, h=1/2gt²

Velocity, v=gt where g is gravity acceleration=9.8m/s² and t is time taken fall the fall

Finding the t taken for the fall;

h=2.5m but we know h=1/2gt²⇒substitute values in this equation

2.5=1/2×g×t²

2.5=1/2×9.8×t²⇒2.5=4.9t²

make t subject of the equation;

t²=2.5/4.9

t=√2.5/4.9 =0.7143sec

Finding the velocity

v=gt

v=9.8×0.7143=7m/s

Answer:

B. virtual

Explanation:

Answer on edge 2020

Virtual is referred to the area which is marked as X and is denoted as option B.

This is defined as an upright image which is formed where the rays seem to diverge.

Both concave and convex lenses produces a virtual image which was why it was chosen as the most appropriate choice.

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A circle graph, or a pie chart is used to visualize information and data. A circle graph is used to easily show the results of an investigation in proportional manner. The arcs of a circle graph are prepositional to how many percent of population gave a certain answer

A circle graph is a graph in the form of a circle that's divided into pie pieces with each pie piece representing a part of the whole data set. In other words, each pie piece represents a percentage of the whole pie. Another word for a circle graph is a pie chart.

A circle graph is used to display data and it's used to recognize parts of a data set. It's useful to easily interpret what's going on in the scenario.

An example of a circle graph is provided in the image attached.

Answer:

Step 1 - 4. Nebular cloud of gas and dust.

Step 2. - 2. Cloud collapses under the force of its own gravitational attraction; usually triggered by a supernova.

Step 3. - 6. Condensed material begins to combine and form a core center, as it warms, a  protostar is formed.

Step 4. - 3. Other gas and matter of the nebular cloud begin to rotate around the protostar, forming a flattened disk.

Step 5. - 5. Stellar core heats as it grows; nuclear fusion begins and a star is born.

Step 6. - 1. Nuclear energy runs out; death: possible supernova.

Answer:

A star is a plasma ball held together by its gravity and compressed by a nuclear fusion at some stage in its development. The closest star on Earth is called the Sun. Several other stars can be seen in the night sky, but none of them is comparable to the Sun due to their very large distances to Earth. Traditionally, stars have been grouped into different constellations.

The stars are formed mainly by the collapse of gas vapors consisting of hydrogen due to gravity. Once the star core is formed, it slowly begins to convert hydrogen to helium in the nuclear fusion. The energy generated in the process flows from the center of the star to its surface and later radiates to outer space. The star is in equilibrium because its internal radiation pressure prevents gravity from collapsing further. When a star's hydrogen fuel is exhausted, its final fate depends on its mass: the smallest stars slowly fade away, while the more massive ones expand into red giants. Eventually, the red giants explode as a supernova, spreading various elements into space. Depending on the mass of the exploded star, for example, the remnant of an explosion may remain a neutron star or a black hole.  

By observing the motion, luminosity, and spectra of a star, it is possible to determine its other properties such as mass, age, and metal content. There are several different types of stars. The most common tool for classifying them is the Hertzsprung-Russell diagram.

Gravitationally bound star systems of two or more stars are quite common. On a large scale, stars are an important part of galaxy structure, together with interstellar gas and dark matter.

Answer:

Ovaries, the female reproductive organs, have two main functions: to produce female germ cells (called eggs or oocytes) and hormones (estrogen and progesterone), which regulate the function of the ovaries.

Two main functions of the female reproductive system are the Production of eggs and preparation for fertilization and Nurturing and supporting a developing embryo or fetus.

The female reproductive system is a complex system of organs and structures responsible for the production of eggs (ova), the fertilization of eggs by sperm, the nourishment and development of a fertilized egg into a fetus, and the delivery of the fetus during childbirth.

The female reproductive system includes several organs and structures, including the ovaries, fallopian tubes, uterus, cervix, and vagina. The ovaries are responsible for producing and releasing eggs, while the fallopian tubes transport the eggs from the ovaries to the uterus, where fertilization can occur.

The uterus is a muscular organ that can expand during pregnancy to accommodate the growing fetus, and the cervix is the opening of the uterus that allows sperm to enter and the baby to exit during childbirth. The vagina is a muscular canal that connects the cervix to the outside of the body and serves as a passageway for menstrual flow and childbirth. Hormones such as estrogen and progesterone, which are produced by the ovaries and other organs, play an important role in regulating the female reproductive system.

Here in the Question,

The two main functions of the female reproductive system in the order in which they occur in the female life cycle are:

1. Production of eggs (ova) and preparation for fertilization: The female reproductive system begins to produce eggs during fetal development, and this process continues until menopause. The ovaries release a mature egg every month during the menstrual cycle, which is prepared for fertilization by the fallopian tubes, uterus, and cervix.

2. Nurturing and supporting a developing embryo or fetus: If the released egg is fertilized by sperm, it implants in the uterus and begins to develop into an embryo, which eventually grows into a fetus. The female reproductive system supports the developing embryo or fetus by providing it with oxygen and nutrients through the placenta. The uterus also expands to accommodate the growing fetus, and the cervix stays closed to protect it from infection. During childbirth, the uterus contracts to push the baby out through the vagina.

Therefore, Two main functions of the female reproductive system in the order in which they occur in the female life cycle are the Production of eggs (ova) and preparation for fertilization and Nurturing and supporting a developing embryo or fetus.

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Answer:

9090 m, 104 s

Explanation:

After the acceleration phase, the rocket reaches a height of:

x = x₀ + v₀ t + ½ at²

x = (0 m) + (0 m/s) (30 s) + ½ (10 m/s²) (30 s)²

x = 4500 m

And it reaches a velocity of:

v = at + v₀

v = (10 m/s²) (30 s) + (0 m/s)

v = 300 m/s

After the fuel runs out, the rocket goes into free fall.  The maximum height reached is:

v² = v₀² + 2a(x - x₀)

(0 m/s)² = (300 m/s)² + 2(-9.8 m/s²)(x - 4500 m)

x ≈ 9090 m

The time to reach maximum height during free fall:

v = at + v₀

0 m/s = (-9.8 m/s²) t + (300 m/s)

t ≈ 30.6 s

And the time to land from the maximum height:

x = x₀ + v₀ t + ½ at²

0 m = (9090 m) + (0 m/s) t + ½ (-9.8 m/s²) t²

t ≈ 43.1 s

So the total time is:

t = 30 s + 30.6 s + 43.1 s

t ≈ 104 seconds

Answer:

Shape of a velocity versus time graph reveals pertinent information about an object's acceleration.

Explanation:

For example, if the acceleration is zero, then the velocity-time graph is a horizontal line (the slope is zero). The gradient of a distance-time graph represents the speed of an object. The velocity of an object is its speed in a particular direction. The slope on a velocity-time graph represents the acceleration of an object. The distance travelled is equal to the area under a velocity-time graph.

The curve of a velocity vs time graph reveals significant information about an object's acceleration.

The acceleration of the object is shown by the graph between velocity and time. Any object's acceleration is the variation in velocity with the passage of time. On the graph, this temporal variation with regard to velocity is shown.

For instance, if the acceleration is 0, the velocity-time graph is a horizontal line. (There is no slope.) The gradient on a distance-time graph corresponds to an object's speed.

The velocity of an object is its speed in a certain direction. The slope of a velocity-time graph represents an object's acceleration. The distance traveled is displayed on the underside of a velocity-time graph.

Therefore, a velocity versus time graph's shape provides important details about an object's acceleration.

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A) 350 J

- The initial internal energy of the cup is

[tex]U_i = 230 J[/tex]

- The final internal energy of the cup is

[tex]U_f = 580 J[/tex]

According to the first law of thermodynamics:

[tex]U_f - U_i = Q+W[/tex]

where

Q is the heat absorbed by the system

W is the work done on the system

The work done on the system in this case is 0, so we can rewrite the equation as

[tex]U_f - U_i = Q[/tex]

And so we find the heat transferred

[tex]Q=580 J - 230 J=350 J[/tex]

B) IN the cup

Explanation:

in this situation, we see that the internal energy of the cup increases. The internal energy of an object/substance is proportional to its temperature, so it is a measure of the average kinetic energy of the molecules of the object/substance. Therefore, in this case, the temperature (and the energy of the molecules of the substance) has increased: this means that heat has been transferred INTO the system from the environment (the heat came from the sun).

Answer:

3.822 m/s

Explanation:

You can solve this by using the kinematic equations:

[tex]v_{f} = v_{i}+gt[/tex]

[tex]d = v_it\times\dfrac{1}{2}gt^{2}[/tex]

Where:

Vf = final velocity (impact velocity)

Vi = initial velocity

g = acceleration due to gravity

d = distance traveled

t = time

Acceleration due to gravity on Earth is constant. Gravity accelerates objects towards the ground at 9.8m/s².

Initial velocity is always at 0 m/s in free fall. Let's see what we have as our given:

d = 0.75m

Vi = 0 m/s

g = 9.8 m/s²

Look at our equation for the impact velocity (Vf) with our current given plugged in:

[tex]v_{f}=v_{i}+gt[/tex]

[tex]v_{f}=0m/s+(9.8m/s^{2})(t)[/tex]

We still do not have time. That is where the second equation comes in. We plug in our values again in the secon equation and derive time:

[tex]d=v_{i}t+\dfrac{1}{2}gt^{2}\\\\0.75m=0m/s(t)+\dfrac{1}{2}(9.8m/s^{2})(t^{2})\\\\0.75m = 0+(4.9m/s^{2})(t^{2})\\\\\dfrac{0.75m}{4.9m/s^{2}}=t^{2}\\\\\sqrt{ 0.15s^{2}}=\sqrt{t^{2}}\\\\0.39s=t[/tex]

So our time is 0.39s. Now we use this in our first equation:

[tex]v_{f}=0m/s+(9.8m/s^{2})(t)[/tex]

[tex]v_{f}=(9.8m/s^{2}(0.39s)[/tex]

[tex]v_{f}=3.822m/s[/tex]

Yes! The Planet Jupiter is Magnetic

Answer: yes

Explanation:

It is surrounded by a giant magnetic field called the megnetophere

Question:

Which of these is a chemical property of a substance?

A) Density

B) Color

C) reactivity

D) melting point

Answer:

C) Reactivity

Explanation:

We  identify Reactivity as a chemical property because it dose Change to the chemical nature of matter such as change the way why the earth looks. One example of Reactivity is when we have earthquakes. But Things like Density, Melting point and color are signs of Physical properties because they do not change the chemical nature of matter.

The answer would be reactivity

Answer:

To get to the moon you need to travel in a spacecraft and will take approximately 10 hours of travel.

Explanation:

Since the first spaceship to land on the moon in 1959 , several trips have been made so far.The NASA trip in 2006 opened more routes to the moon and achieved a time travel of 8 hours compared to the first one done in 1959 that was 34 hours of time travel.Currently, NASA has intiated programs that will see robots sent to the moon for research.

Hope this helps!

Answer:

Its from a reflection of sound waves against a hard surface

Explanation:

Answer:

1.28 m, 14 m/s

Explanation:

At the maximum height, the velocity is 0.

Given:

a = -9.8 m/s²

v₀ = 5.00 m/s

v = 0 m/s

x₀ = 0 m

Find:

x

v² = v₀² + 2a(x - x₀)

(0 m/s)² = (5.00 m/s)² + 2(-9.8 m/s²) (x - 0 m)

x = 1.28 m

The maximum speed is at the bottom of the well.

Given:

a = -9.8 m/s²

v₀ = 5.00 m/s

x₀ = 0 m

x = -8.5 m

Find:

v

v² = v₀² + 2a(x - x₀)

v² = (5.00 m/s)² + 2(-9.8 m/s²) (-8.5 m - 0 m)

v = -13.8 m/s

Rounded to 2 sig-figs, the maximum speed is 14 m/s.

Answer:

110

Explanation:

The net charge of the compound is the sum of the net charges due to the electrons and the protons:

[tex]Q=N_p q_p + N_e q_e[/tex]

where

Np is the number of protons

Ne = 50 is the number of electrons

[tex]N_p = +1.6\cdot 10^{-19} C[/tex] is the charge of each proton

[tex]N_e = -1.6\cdot 10^{-19} C[/tex] is the charge of each electron

[tex]Q=+9.6\cdot 10^{-18} C[/tex] is the net charge of the compound

Solving the equation for Np, we find the number of protons:

[tex]N_p = \frac{Q-N_e q_e}{q_p}=\frac{+9.6\cdot 10^{-18}C-(50)(-1.6\cdot 10^{-19}C)}{+1.6\cdot 10^{-19} C}=110[/tex]

Answer: it depends potential energy is the build up of kinetic energy like going to the top of a roller coaster. kintic is the use of the potential energy like going down the roller coaster so depends how much energy one another give :)

Hope this helps you out :)

Answer:

Explanation:

The question has no set meaning. Suppose you take a rock to the top of a building. You put the rock over the edge of the building. You don't drop it yet. The potential energy is greatest for the rock under this condition. The kinetic energy is 0 because the rock is not moving.

Now you let the rock go. As it falls, it looses distance to the ground which means that the Potential energy is nearing 0. The Kinetic energy is picking up because the rock is moving faster.

At the bottom of the rock's journey just before it hits the ground, the KE is at a maximum and the PE is nearly 0.

Hey there!

The answer is that The data was not reliable because there was not any repetition.

An experiment should be completed multiple times to be sure of accurate results.

A screenshot is attached.

Hope this helps! :)

Answer:

Actually, Kaylene M., the correct answer was D. You know:"The data is not reliable because there was not any repetition." The answer you have "screenshoted" I got the question wrong because of you. Thanks a lot.

Explanation: