In the field of Chemistry, an Atom is a tiny piece of matter, an Element is a substance that cannot be broken down into a simpler substance, a Particle is the basic unit of an element, and a Phase is a unique form of matter in which it can exist.
Explanation:The correct matches for these definitions are as follows:
Atom - B) a tiny piece of matter Element - A) a substance that cannot be broken down into a simpler substance Particle - D) the basic unit of an element Phase - C) a unique form of matter in which it can existThese are basic terms in chemistry and understanding them can help you in your study of matter, its properties, and how it changes.
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SOMEBODY PLEASE HELP!!! Indicate the reasons why the centripetal acceleration (and centripetal force) always point to the center in uniform circular motion. Select all that apply.
A.) The v points toward the center of the circle.
B.) The t points toward the center of the circle.
C.) F=ma and since "a" points toward the center, so does F.
D.) F=ma and since "m" points toward the center, so does F.
(V=velocity)(T=time)(A=acceleration)(F=force)(M=mass)
Answer:
The correct answer is a=(triangle)v/(triangle)t, and the (triangle) v points toward the center of the circle. AND C. F=ma, and since “a” points toward the center, so does F.
Explanation:
I just took this quiz.
Over the last several decades, scientists have addressed the problem of nonrenewable natural resources such as fossil fuels. Humans are using fossil fuels at a rapid rate and scientists believe that one day we will run out of them. To solve this problem, research has been conducted on alternative energy sources. One alternative energy source is nuclear energy. Although nuclear energy is a good solution to this problem, there are concerns.
Which of these is NOT a benefit of nuclear energy?
A) fossils fuels are not required
B) does not contribute to global warming
C) presence of hazardous radioactive materials
Eliminate
D) little carbon emissions released into the air
Answer:
Option (C)
Explanation:
The nuclear energy is defined as a type of energy which liberates either by the process of nuclear fusion or nuclear fission and is mainly used to generate electricity. This energy is stored in the core of an atom (or nucleus).
It is highly effective, cost-effective and there is no emission of greenhouse gases.
But it also has some disadvantages, of which one is that it produces radioactive waste materials, which are difficult to dispose these substances and is also a very expensive method. These materials emit radiations that are harmful to the organisms. So, it is very challenging to dispose these radioactive waste materials.
Thus, the correct answer is option (C).
Answer:
c.
Explanation:
presence of hazardous radioactive materials
How long would it take you to hop 30 meters if you hopped 5 m/s?
To hop 30 meters at a rate of 5 meters per second, it would take 6 seconds, calculated using the formula t = d/v where t is time, d is distance, and v is velocity.
Explanation:If you hopped at a rate of 5 meters per second (m/s), to cover a distance of 30 meters, you would use the basic formula for distance, which is distance equals speed times time (d = vt). Here, you want to find the time (t), so you rearrange the formula to t = d/v.
Substituting in our known values gives us t = 30 m / 5 m/s, which simplifies to t = 6 seconds. Therefore, it would take you 6 seconds to hop 30 meters at a speed of 5 m/s.
A 6000 kg train car traveling at 2.5 m/s collides with another 6000 kg train car now they are both moving but with a speed of 1.25m/s. this an exaple of?
Newton's secind law
Newton's third law
Newton's first law
The law of conservation of momentum
You push a coin across a table. The coin stops. How does this motion relate to balanced and unbalanced forces?
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A platinum bar measures 5.0 cm long, 4.0 cm wide, and 1.5 cm thick. It has a mass of 750.0 grams. Don't forget to find the volume of the bar (L X W X H). Use the formula D=m/v Calculate the density of the platinum bar (you need the volume first). Enter your answer in the space provided.
The density of the platinum bar is found by first calculating the volume (5.0 cm*4.0 cm*1.5 cm = 30.0 cm^3). Then, using the formula D=m/v, we divide the mass (750.0 grams) by the volume to find the density, which is 25.0 g/cm^3.
Explanation:The density of a material is calculated by using the formula: D=m/v, where 'D' is the density, 'm' is the mass, and 'v' is the volume. In this case, we need to find the volume of the platinum bar first. The volume is determined by multiplying length, width, and height. Thus, you multiply 5.0 cm by 4.0 cm by 1.5 cm, which equals 30.0 cm^3.
Once you have the volume, you can determine the density of the platinum. The mass given is 750.0 grams. Therefore, density (D) is mass divided by volume. When you divide 750.0g by 30.0 cm^3, the calculated density becomes 25.0 g/cm^3.
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All parts of the electromagnetic spectrum travel at a speed of 3 × 108 m/s when traveling through no medium. A "vacuum” means that there is no medium, such as a tube without any air in it. Therefore, 3 × 108 m/s is said to be the speed of light in a vacuum. If an electromagnetic wave’s frequency doubles in a vacuum, what are the other effects on the wave? Wavelength doubles and speed doubles. Wavelength doubles and speed stays the same. Wavelength divides in half and speed doubles. Wavelength divides in half and speed stays the same
Answer:
the answer is D.
Explanation:
Answer:D. wavelength divides in half, and speed stays the same
Explanation: edge 2023
A 2.9 gram bullet is shot into a tree stump. It enters at a velocity of 304 m/sec and comes to rest after having penetrated the stump in a straight line. It takes 0.00043 sec to come to a stop after striking the stump. What was the force on the bullet during impact?
if something is being carried by westerlies, what direction is it moving??
wich theory focuses on how people are different than animals
Answer:
Humanism.
Explanation:
Humanism is the ethnic and philosophical stance which focus on the values of human beings. It is the defined as the critical thinking and acceptance over the superstition and it is done by individual or group of people.
It is defined as looking the world on the basis of science rather go with the supernaturals.
Therefore, the theory of Humanism focus how people are different than animals.
A (n)________ is a material that does not conduct heat well
You need to measure the length of your driveway. Which measuring tool would produce accurate results that you would expect to be the same as those found by others? A Your hand's span B A string cut to the length of the tip of your finger to the bottom of your palm C A meter stick with only centimeters D A ruler with millimeters and centimeters
the correct naswer is goig to be letter choice D
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Which term describes the process of water moving from plant leaves to the atmosphere?
Air pressure
Humidity
Transpiration
Density
Why is it expensive to bring electricity into urban areas?
There are various reasons that electricity transmission in urban areas is expensive.
What do you know about electricity supply in urban areas?The electricity to the urban area is supplied by the power plants and the power plants are set up in the rural areas if it is a hydropower plant then it will be set up near the river in the rural areas.
The various reasons for high electricity costs in urban areas are:-
Population density is the population in the urban area is large in the small areas a large number of people live. The transmission line set-up will be costly.Power plants are not located in cities. Power has to travel a long distance over power lines to reach cities.The power consumption in the urban areas is also high so government increases the price so the people can utilise the electricity smartly.Therefore, there were some reasons I have discussed above for the higher electricity cost in urban areas.
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The wolves and moose of Isle Royale are the focus of the longest-running study of a predator-prey system in the wild. Both are recent arrivals to Isle Royale: moose swam to the island in the early 1900’s. Wolves followed decades later, traveling over the ice from Canada in the 1940’s.About 40 years into the study, the wolf population crashed when humans introduced the canine-parvovirus. Additional factors over the years have impacted both populations. At one point during the study, the moose population collapsed during the most severe winter on record followed by an outbreak of moose ticks. What point on the graph represents the outbreak of moose ticks and a drastic decline in the moose population?
A) Point A
B) Point B
C) Point C
D) Point D
Point C is the answer
Answer:
We have been given two cases of Wolves and moose of Isle Royale
We need to tell the outbreak of moose ticks and a drastic decline in the moose population.
We can see from the graph that A and B are representing Wolves
So, Option A and B are discarded.
Now, we should know the meaning of Outbreak in a graph which means that the large number of people are represented by a single point.
Point C is representing large number of people at one point
So, Outbreak of Moose ticks is represented by Point C.
Now, the drastic decline is the point where the curve started to decrease
At point D the curve is decreasing
Hence, the drastic decline is at the point D.
The larger the push, the larger the change in velocity. This is an example of Newton's Second Law of Motion which states that the acceleration an object experiences is _____ .
A neutral atom of aluminum has 13 protons and ______ electrons. (Enter a whole number.)
The value of acceleration due to gravity (g) on Pluto is about 0.61 meters/second2. How much will an object that weighs 250 newtons on Earth weigh on Pluto? Note that the value of acceleration due to gravity on Earth is 9.8 meters/second2?
A.3.5 newtons
B.15.6 newtons
C.18.2 newtons
D.59.78 newtons
Answer:
The answer to this question is B: 15.6 newtons
Explanation:
Which benefit of stretching makes you more comfortable when you move around?
Answer:
Stretching refers to the physical exercise in which a specific muscle or muscle group is deliberately flexed or extended.
It improves the elasticity and tonicity of the muscles.
Benefits of stretching may include:
It reduces the muscle tension It increases range of motion of the joints It enhances the muscular coordination It increases the blood circulation to various parts of the body .Blood circulation increases the energy of the muscles.In your own words, explain how Doppler radar works. Describe the properties of electromagnetic waves and interactions that make Doppler radar possible. (13 points)
If you stand up in a big room and echo, your voice will echo from the walls. As long as the room is empty. Since the speed of sound is constant, depending on air density, the more humid the air the faster and farther sound travels. The speed of sound is constant, you could measure the time it takes for your voice to echo off the walls. The same thing happens with Doppler radar, but it’s not voice, it has higher frequency signals.
Doppler Radar uses Doppler Effect as a principle to measure velocities, detect the presence of objects, identify meteorological phenomena and their intensity levels. This radar emits a continuous radio signal that allows the radar to differentiate between objects that are stationary and those in motion. This radar can be used, for example, to measure the speed of a particular object and to indicate its location, so that it is widely used in traffic surveillance.
Doppler radar is the most widely used type of weather radar that is currently of utmost importance for atmospheric monitoring. It is also employed for example in agriculture, air traffic and weather forecasting. Information gathered by radar assists meteorologists in early diagnosis of natural disasters.
Doppler effect, used by these radas, is a physical phenomenon observed in waves emitted or reflected by a source. It is perceived, for example, when listening to the sound of an ambulance passing by an observer. As the ambulance approaches, the tone becomes more and more acute, and as it moves away it becomes more serious. What happens is that we perceive a relative frequency, which is not the same frequency as the wave was emitted.
What two roles do forensic engineers play?
Accident reconstructions and failure evaluations of vehicles and structures are the two roles that performed by forensic engineers.
What is forensic engineering?When reconstructing crimes and accidents and figuring out their causes, forensic engineering makes use of ideas from mechanical, chemical, civil, and electrical engineering. Reconstruction of auto accidents is a significant part of that effort. Forensic engineers analyze information from skid marks, damage to cars and their locations after collisions, road and environmental conditions, injuries to drivers, passengers, and pedestrians, and witness testimony to assess what might have caused the accident.
Accident reconstructions and failure evaluations of vehicles and structures are performed by forensic engineers. In order to comprehend the physical dynamics of the 1995 Oklahoma City bombing and to provide an explanation for the fall of the World Trade Center's twin towers during the September 11 attacks in 2001, forensic engineering was crucial. Police investigations into auto accidents can benefit from forensic engineering.
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1. The variable ______________ describes how quickly something moves. a) time c) speed b)position d) mass
if the same amount of energy is added to 5 g of water and to 50 g of water, which sample will have the higher temperature
A current will not be induced because the wire is not part of a closed circuit.
What speed is a car going if it takes 2 hours to go 80 miles?
calculated the gravitational potential energy of a 93.0 kg sky diver who is 550 m above the ground
Final answer:
The initial gravitational potential energy of a 93.0 kg skydiver at 550 m above the ground is 501,090 Joules.
Explanation:
The initial gravitational potential energy ([tex]PE_g[/tex]) of a 93.0 kg skydiver when they are 550 m above the ground can be calculated using the formula
[tex]PE_g[/tex] = mgh, where 'm' is mass, 'g' is the acceleration due to gravity (9.8 m/s2), and 'h' is the height above the ground. So the initial gravitational potential energy
[tex]PE_g[/tex] = (93 kg) × (9.8 m/s2) × (550 m) = 501,090 Joules (J).
an object wants to maintain its state of motion because it has mass
Your teacher gives you 30 mL of vinegar and one gram of baking soda and tells you to find evidence that the law of conservation of mass is correct. Design an experiment to find this evidence and state your expected results.
To demonstrate the law of conservation of mass with vinegar and baking soda, an experiment can be designed where total mass is measured before and after the reaction in a closed system, showcasing that mass remains unchanged as expected by this fundamental chemical law.
To demonstrate the law of conservation of mass using vinegar (acetic acid) and baking soda (sodium bicarbonate), you could design an experiment where you react these two substances and measure the total mass before and after the reaction. Here are the steps you would follow:
Place a clean, dry flask or beaker on a precise digital scale and tare the scale to zero.
Add 30 mL of vinegar to the flask and note the mass.
In a separate container, weigh out one gram of baking soda.
Quickly but carefully add the baking soda to the vinegar in the flask and immediately seal the flask with a balloon or a rubber stopper with a tube to capture any gases produced.
Allow the reaction to proceed completely. This reaction produces carbon dioxide gas, water, and sodium acetate.
Weigh the sealed flask again once the reaction has stopped.
The expected result is that the total mass of the sealed system (flask, vinegar, baking soda, products, and gas within the balloon or stopper) should remain constant as per the law of conservation of mass.
Expected Results
If the experiment is done correctly, there should be no mass change. This is because, according to the law of conservation of mass, mass is neither created nor destroyed in a chemical reaction. In a closed system, the total mass before and after the reaction should be the same, even though the substances' physical states and chemical forms may change.
The unit of length that most nearly matches the width of your finger?
Difference between Daniel and Leclanché cells
Explanation :
Daniel cells:
It is a primary cell. It consists of a zinc rod and a copper vessel (in fig 1). It can be seen that a zinc rod is put in dilute sulfuric acid which is contained in a porous pot.
Daniel cell works on the principle of the redox reaction. The electrons pass form zinc rod to wire. Then it passes to the copper rod. Thus, a current is produced.
It produces an EMF of 1 volt.
Leclanche cell :
Leclanche cell is also known as dry cells (fig 2). It contains an electrolyte of ammonium chloride. Carbon acts as a cathode while zinc is an anode.
It produces an EMF of 1.4 volts.
Answer:
Explanation:
A Leclanche cell consists of a carbon electrode packed in a porous pot containing manganese dioxide and charcoal powder (Fig 2.22). The porous pot is immersed in a saturated solution of ammonium chloride (electrolyte)