true or false:
warm air sinks and cold air rises
EASY POINTS!
AND BraINliEsT!
Answer:
False
Explanation:
Hot air is lighter and cold air is heavier so hot air rises and cold air sinks.
Lan tries to make a 10 W lightbulb light up by connecting it to a battery with
an insulated copper wire. When the lightbulb does not light up, she assumes
that the battery is dead. What can she do to make an electric current flow
through the lightbulb?
A. Replace the battery with a coil of the wire, and then pass a magnet
back and forth through the coil.
B. Replace the battery with a magnet, and then pass a piece of wire
back and forth over the magnet.
O C. Wrap a magnet with several coils of the wire, and then hold the
lightbulb close to the wire.
D. Wrap the lightbulb with several coils of the wire, and then hold a
magnet close to the wire.
Answer:
A
Explanation:
When a magnet passes through something that's copper, there is a reaction that generates an electric pulse. Passing a magnet back and forth through the wire is much more likely to generate the electrical charge needed then the other options given.
Lan can replace the battery with a coil of the wire, and then pass a magnet back and forth through the coil to make an electric current flow through the lightbulb. Hence option (A) is correct.
What is electromagnetic induction ?The generation of an electromotive force (emf) across an electrical conductor in a fluctuating magnetic field is known as electromagnetic or magnetic induction.
Induction was first observed in 1831 by Michael Faraday, and James Clerk Maxwell mathematically named it Faraday's law of induction. The induced field's direction is described by Lenz's law. One of the four Maxwell equations in his theory of electromagnetic, the Maxwell-Faraday equation is a generalization of Faraday's law.
When Lan replace the battery with a coil of the wire, and then pass a magnet back and forth through the coil, it generates electromagnetic induction and electric current flows through the lightbulb.
Learn more about electromagnetic induction here:
https://brainly.com/question/26334813
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Based on the weather map, state the direction of the warm front. Using complete sentences predict the effect of the warm front on any one city shown on the map. Will this prediction always come true? Why or why not?
Answer:
Yes and No because it is warm in one spot and cold in the other.
Explanation:
Answer: it is not right because it's raining .
Explanation:
Read the excerpt from "Healthy Eating."
But no one can ignore the damage being wrought by all this bad eating. More than one out of three adults in the United States -- 37.5 percent -- are obese, according to the Centers for Disease Control and Prevention. Some of the leading causes of death -- heart disease, stroke and type 2 diabetes -- are directly linked to obesity. And childhood obesity has tripled in the last 30 years. With more than a third of kids between 6 and 19 considered obese, the CDC reports, they are at substantially more risk for developing cardiovascular disease, diabetes, bone and joint conditions, and cancer.
The author's argument that a poor diet can be harmful to a person's health is _____________________.
ineffective, because it lacks clear and reasonable evidence.
ineffective, because it leaves the reader with questions.
effective, because it addresses and refutes a counterclaim.
effective, because it includes facts from a credible source.
Answer:
I think c hope this helpss
What is the density at 20oC of 12.0 milliliters of a liquid that has a mass of 4.05 grams?0.338 g/mL
2.96 g/mL
16.1 g/mL
48.6 g/mL
The density at 20°C of 12.0 milliliters of a liquid that has a mass of 4.05 grams is 0.3375g/mL.
HOW TO CALCULATE DENSITY:
The density of a liquid can be calculated by dividing the mass of the liquid by its volume. That is;Density (g/mL) = mass (g) ÷ volume (mL)According to this question, a liquid at 20°C has a volume of 12.0 milliliters and a mass of 4.05 grams. The density is calculated as follows:Density (g/mL) = 4.05g ÷ 12mLDensity of liquid (g/mL) = 0.3375g/mLTherefore, the density at 20°C of 12.0 milliliters of a liquid that has a mass of 4.05 grams is 0.3375g/mL.Learn more about how to calculate density at: https://brainly.com/question/2040396?referrer=searchResults
RIDDLE
A logician with some time to kill in a small town decided to get a haircut. The town had only two barbers, each with his own shop. The logician glanced into one shop and saw that it was extremely untidy. The barber needed a shave, his clothes were unkempt, his hair was badly cut. The other shop was extremely neat. The barber was freshly shaved and spotlessly dressed, his hair neatly trimmed. Why did the logician return to the first shop for his haircut?
who ever gets it right get the brainiest
Answer :First Man
Explanation :He went to the first one bc he knew nobody would be there so he could kill him and nobody will notice bc there at the first man shopCan someone help me with this I'm-- never mind I would just like help..
Genes are organized on matching pairs of _______.
Answer:
homologous chromosomes
Explanation:
A flashlight demonstrates the following type of energy transformations.
Chemical into Electricity into Light, Sound, Heat and Chemical
Chemical into Light, Sound, Heat and Chemical
Electricity into Chemical into Light and Sound
Electricity into Heat into Sound and Chemical
Answer:
Electricity into Chemical into Light and Sound.
Explination:
Hope this helps, I'm not sure if this is the right answer, though.
What is the gravitational force between two cars (one car is 900 kg and the other car is 800 kg) in a parking lot that is three meters from each other?
What is the gravitational force between two cars (one car is 1500 kg and the other car is 1000 kg) in a parking lot that are six meters from each other?
Answer:
What is the definition of Acceleration, velocity, speed and displacement? Changing ... Melissa is running to the senior lot to get to her car, she decelerates from 10m/s to 0.4m/s in ... 3. What two variables affect the gravitational attraction between two objects? ... One skater's mass is 60 kg and the other's mass is 72 kg. If the.
Explanation:
PLS ANSWER!!! WILL GIVE BRAINLIESTAND 50 POINTS!!!!! Copernicus determined, for each planet, the approximate (1)______ of (2)______ required to orbit around the sun.
Question 1:
A. Period
B. Orbit
C. Distance
D. Cycle
Question 2:
A. Revolution
B. Rotation
C. Orbit
D. Distance
Answer:
period of revolution
Explanation:
....
Describe the difference between a transverse wave and longitudinal wave. Include the parts that you would find on a transverse wave and longitudinal wave. Give an example of each.
PLEASE HELP! ITS A WRITTEN RESPONSE!
Answer:
A transverse wave is a moving wave in which the current is perpendicular to the direction of the wave or path of propagation. A longitudinal wave are waves in which the displacement of the median is in the direction of the propagation.
Explanation:
hi
Which object would be more difficult to get to a velocity of 10 cm/s a 20 kg bowling ball or a 1 kg tennis ball? Why? Use the terms force, mass, and velocity in your explanation.
Answer:
im on a winning streak. :)
Explanation:
What is the highest frequency wave? The lowest frequency wave?
PLEASE HELP! WRITTEN RESPONSE!
Answer:
Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies. Radio waves, on the other hand, have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation.
Explanation:
Hope this helps:)
Answer:
1. gamma rays 2. Radio waves
Explanation:
what is the speed of the object in the graph? Explain
Answer:
0.8m per second
Explanation:
we measure speed as distance over time
distance=8m
time=10s
therefore speed = 8/10
=0.8m per second
What is the gravitational force between two cars (one car is 1500 kg and the other car is 1000 kg) in a parking lot that are three meters from each other?
Answer: Your answer 0.000002500737 in pounds-force!
Explanation: Hope my answer helped you! Plz, mark my answer as Brainliest and Thank you!
i only need help with these three questions!
how is the preodictable arranged by atomic mass, coloms , and rows
Answer:
bc it has prdiction and your first prediction the second and thirds
. Friction is a rubbing force that ___________ a spinning yo-yo.
slows down
speeds up
adds energy to
does not affect
Answer:
i think add energy
Explanation:
What do the key results indicate?
ED 2020
The density with balls
What is the acceleration of the car at segment C?
30 m/s2
–30 m/s2
40 m/s2
–40 m/s2
Answer:
-30 m/s2
Explanation: