What is the working resistance of a bulb that takes a current of 0.25 A when it is connected to 220V mains supply?
Answer:
880 Ω (Ohms)
Explanation:
To calculate Resistance from Potential Difference (Volts) and Current (Amps), you use the equation R = V/I
So,
R = 220/0.25
R= 880
PLEASE HELP
Sort the chemical reactions based on whether they absorb or release energy.
Answer:
Releases Energy:
1) Respiration in cells
3) Activating a cold pack
3) Burning a candle
Absorbs energy:
4) Baking bread
5) Photosynthesis
6) Producing electric current
DO mutations only form from natural factors?
Answer:
Mutations occur throughout the natural world.
Explanation:
-A-Astro
What type of electromagnetic energy does a light use?
Answer:
electromagnetic radiation
Explanation:
electromagnetic radiation: Energy that travels as a wave, including forms of light. Electromagnetic radiation is typically classified by its wavelength. The spectrum of electromagnetic radiation ranges from radio waves to gamma rays. It also includes microwaves and visible light.
A person riding a bicycle wants to move the bicycle forward. She moves her legs up and down on the bicycle's pedals. Then the rider wants to stop the bicycle. She stops pedaling and the bicycle slows. She takes one of her feet off a pedal and puts her foot on the ground to stop the bicycle and stay upright.
Which of these best identifies a pathway of systems in the rider's body, as described in this scenario?
A person riding a bicycle wants to move the bicycle forward. She moves her legs up and down on the bicycle's pedals. Then the rider wants to stop the bicycle. She stops pedaling and the bicycle slows. She takes one of her feet off a pedal and puts her foot on the ground to stop the bicycle and stay upright.
Which of these best identifies a pathway of systems in the rider's body, as described in this scenario?
nervous system > musculoskeletal system > circulatory system > nervous system
musculoskeletal system > nervous system > circulatory system > musculoskeletal system
musculoskeletal system > circulatory system > musculoskeletal system > nervous system
nervous system > musculoskeletal system > nervous system > musculoskeletal system
Answer:
nervous system>musculoskletal system>circulatory system>nervous system
Explanation:
Into which chambers does blood enter the heart and through which chambers does blood leave the heart?
Answer:
Blood enters the right atrium and passes through the right ventricle.
Explanation:
The two bottom chambers are the right ventricle and the left ventricle. These pump blood out of the heart.
THIS IS SCIENCE If you answer this please make two sides or list which go on each one whether it is Terrestrial or Jovian. I will give brainliest!
Compare terrestrial and Jovian planets below by writing each characteristic in the correct
category.
• less massive
• more massive
• many moons
• smaller volume
• zero to two moons
• farther from the Sun
• some contain ring systems
• larger volume
• closer to the Sun
• composed mostly of gases
• longer revolutionary period
• shorter revolutionary period
• composed of silicate rocks and metals
• geologic features like craters and mountains
Answer:
geologic features like craters and mountains
Explanation:
when i did this my teacher said it was ok
When excess _____ flow into an aquatic ecosystem, a chain of events may take place which leads to a low dissolved-oxygen level in the water. This is called eutrophication.
Group of answer choices
nutrients
gas particles
water and sand
solid substances
Answer:
solid substances
Explanation:
water evaporates and becomes a gas when from the sun
Answer:
water vapour
Explanation:
water vapour condents to water/rain
Which vein carries oxygenated blood back into the heart?
Answer:
The veins that carry oxygenated bloof back into the heart are the pulmonary arteries.
Explanation:
Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. Oxygen-rich blood then flows through the mitral valve (MV) into the left ventricle (LV), or the left lower chamber.
Answer:
The veins that carry oxygenated bloof back into the heart are the pulmonary arteries.
Explanation:
How can speed be described?
Select one:
The mass multiplied by the acceleration of an object.
The force on an object divided by the mass of an object.
The distance an object travels at a certain velocity.
The distance travelled by an object in a certain time.
Answer:
The mass multiplied by the acceleration of an object.
Explanation:
Please give brainliest, It's not much, but it's honest work.
What is the working resistance of a bulb that takes a current of 0.25 A when it is connected to 220V mains supply?
Show working
Answer:
data given we have a current of 0.25A and potential difference of 220V then from ohm's law I=V/R 0.25A=220V/R cross multiplication you get 0.25A×R=220V divide by 0.25A on both side you get 880 ohms
Part A A compass contains a magnet. The magnet responds to Earth's magnetic field. The magnet's north pole points north from most locations on Earth. Based on what you learned about magnetic force, make three predictions, Predict the approximate size of Earth's magnetic field and the approximate location of its North and South Poles. Give a reason for each prediction
Answer:
The Earth's magnetic field intensity is roughly between 25,000 - 65,000 north magnetic pole is 86.50°N and 164.04°E and the south magnetic pole is 64.07°S and 135.88°E
How can speed be described?
Select one:
The mass multiplied by the acceleration of an object.
The force on an object divided by the mass of an object.
The distance an object travels at a certain velocity.
The distance travelled by an object in a certain time.
The correct answer is: [D]:
___________
→ " The distance traveled by an object in a certain time."
___________
Explanation:
Choice: [A]: "the mass multiplied by the acceleration of an object."
refers to: "force". " F = m*a " . → Rule out: Choice: [A].
___________
Choice: [B]: "the force on an object divided by the mass of an object."
refers to: "acceleration". " F /m = a ". → Rule out: Choice: [B].
___________
Choice: [C]: "the distance an object travels at a certain velocity."
refers to: " the time period traveled at a specific speed AND direction."
___________
Choice: [D]: " the distance traveled by an object in a certain time"."
refers to: "speed". → which is our answer!
___________
Note: " speed = distance / time "; That is: " s = d/t " ;
Note that for "speed" ; the "direction of travel is irrelevant."
→ So; we can rule out: "Choice: [C]."
___________
The correct answer is: Answer choice: [D]:
→ " the distance traveled by an object in a certain time."
___________
Hope this is helpful to you in some way! Best wishes!
___________
What do you think happens to the oxygenated blood after it enters the left ventricle?
Explanation:
The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium. From the left atrium blood flows into the left ventricle.
Is the Artic considered a desert? why or why not?
Answer:
Both, much of the artic is a desert including the artic basin, Canadian Artic Archipelgo, and the north pole because the average precipitation is between 150-250mm. This is below 250mm which is the agreed level to be considered a desert.
What is displacement?
Select one:
The direction an object moved.
The time it takes for an object to move a certain distance.
The distance an object moved.
An object’s change in overall position.
Answer:
The change in overall position
Explanation:
what type of electromagnetic energy does a water fountain use.
Answer:
Ultraviolet radiation is the electromagnetic wave used in sterilizing water in drinking fountains.
Explanation:
Ultra Violet (UV) light disinfection is one water treatment system that can be used to remove most forms of microbiological contamination from wate
Which of these shows the common stages of growth for a flowering plant?
leaves, seed, shoot, root system, stem or trunk, flowers
stem or trunk, root system, seed, shoot, leaves, flowers
seed, shoot, root system, stem or trunk, leaves, flowers
flower, seed, shoot, stem or trunk, root system, leaves
Answer:
everything because every part are equally responsible for the growth of plant
a major use of magnesium oxide is as a refractory material.
explain in terms of structure and bonding, why magnesium oxide has a very high melting point.
[ this is 4 marks, please provide a good answer ]
[ giving brainliest + thanks on profile ]
Sodium oxide has a high melting point because of the strength ofits bonds. Due to having strong bonds, they cannot be broken veryeasily. Magnesium chloride is ionic compound. There is a strong electrostatic force of attraction between 2 chloride atoms and 1 magnesium atom.
Because it retains its strength at very high temperatures. It is considered a refractory material with a melting point of 6500 degrees F. It is also very non-reactive with other materials that might be put into the furnace and is even used to make crucibles - containers used to melt other substances.
a revolution around the sun take longer than a rotation of the earths on its axis true or false ?
In the Tough Man Competition, very strong men are challenged to push or pull extremely large and heavy objects to test their strength. In one such challenge, they were asked to push one of two rail cars, an engine car and a box car. The data tables show one man’s results. Look over the data table and answer the questions below.
A. Why couldn't the strong man move the box car with a force of 3000 Newtons? Make sure to include Newton's 2nd Law in your explanation.
B. What could be done to move the boxcar?
C. Another student claims that during the competition, the sum of the forces on the boxcar was 0 N. What evidence is the student using to make this claim? Be sure to explain your thinking.
Which two substances are among the four major types of organic compounds made by living things?
A. Phosphates
B. Nitrates
C. Proteins
D. Lipids
Answer:
Lipids
Explanation:
D:)
Answer:
Lipids and Proteins
Explanation:
Hope this helps <3
In an ionic bond, electrons are ___________________. Choose all the apply.
(12pts + Brainlest)
1. gained
2. lost
3. shared
4. neutral
Answer:
Electrons are shared.
Explanation:
In an ionic bond, electrons are gained and lost. So, the correct options are A and B.
What is an ionic bond?An atom can establish bonds with other atoms in two main ways: covalent and ionic. The sharing of electrons between two or more atoms forms a covalent connection. When two or more ions join contact, they can create ionic bonds that are held together by charge differences.
A chemical link in which one atom transfers one or more electrons to another atom is known as an ionic bond. A negatively charged ion, or anion, is created when an atom receives electrons, while a positively charged ion, or cation, is created when an atom loses electrons. The ions' opposing charges draw to one another and create a solid link between them. Usually, a metal and a non-metal atom form ionic connections. Ionic bonds contain electrons.
So, the correct options are A and B.
Learn more about Ionic bonds, here:
https://brainly.com/question/11527546
#SPJ2
Which two substances are among the four major types of organic compounds made by living things?
A. Phosphates
B. Nitrates
C. Proteins
D. Lipids
Answer:
D:)
Explanation:
Lipids
HELP NEED THIS DONE BEFORE 9:45!!!!!!!!!!!!!!!! WILL GIVE 100 POINTS AND BRAILIEST IF DONE BEFORE 9:45!!!!!!!!!!!!!
Answer:
1.) 742.57 m/s
2.) 132
3.) 4.375 hours
4.) 1080
5.) 81.6 km per hour
6.) 20 min = 1,200 secs1000 / 1200
Explanation:
Your Welcome!
Answer:
1.) 742.57 m/s
2.) 132 m
3.) 4.375 hours
4.) 1080 m
5.) 81.6 km per hour
6.) 20 min = 1,200 secs1000 / 1200
Explanation:
**Brainliest would be appreciated**
To calculate acceleration you must
Select one:
multiply the force and mass
add the force and mass
divide the mass by the force
divide the force by the mass
Match the term with its description.
Acid:
Base:
Ions:
pH:
Definition:
A value from 0 to 14 is used to specify how acidic or basic a compound is when it is dissolved in water
Used to measure the pH of substances by determining their hydrogen ion concentration
A compound that increases hydroxide ions (OH−) when it is dissolved in a solution
A compound that increases hydrogen ions (H+) when it is dissolved in a solution
A value from 0 to 14 is used to specify how acidic or basic a compound is when it is dissolved in water= pH
A compound that increases hydroxide ions (OH−) when it is dissolved in a solution= Acid
A compound that increases hydrogen ions (H+) when it is dissolved in a solution= ions
Used to measure the pH of substances by determining their hydrogen ion concentration= base
Answer: pH goes with A value from 0 to 14 is used to specify how acidic or basic a compound is when it is dissolved in water
base goes with A compound that increases hydroxide ions (OH−) when it is dissolved in a solution
ions goes with Used to measure the pH of substances by determining their hydrogen ion concentration
acid goes with A compound that increases hydrogen ions (H+) when it is dissolved in a solution
Explanation: i took the test and got it right
can someone help me w this? A pneumonic device is a memorization tool that helps you remember things. For example, if you can read music you probably have heard, “Every Good Boy Does Fine” to learn the names of the lines on the treble clef EGBDF. Or maybe your math teacher taught you, “Please Excuse My Dear Aunt Sally,” to help you remember the order of operations. It is now your turn to think of a pneumonic device to remember the water cycle in order. Write your pneumonic device below.
Charlie took Edward's pencil
Carson tames emperor penguins
Below are atomic-scale models of two different substances. Use the terms in the word bank to label these models. Use each of the terms only once.
Top box :-
Denoted to one ClHence it should be atom
#Top right box
Denoted to KCl and CH_4 moleculesHence answer should be molecules
#Bottom left:-
Denoted to Whole branching of KCl h.ce it's repeating atom group
#Last
CH_4 's extended structure is shown hence it's extended structure