Answer:
In a building, heat rises. By putting the insulation in the ceiling heat will rise and get trapped at the top and fill up the entire room. The purpose of insulation is to minimize the transmission of heat within the walls, floors, and ceilings. By minimizing the transmission of heat, you not only keep the room warm but you also lower your electricity and heat bill.
Julie ran the 50-meter dash in 20 seconds. What was her speed?
plz answer ASAP dont give links to answer please
Answer:
50/20 = ans
Explanation:
you tube - superio s
Fusion produces less radioactivity than fission.
True or false
Answer:
False
Explanation:
Fusion doesn't produce more.
Pedro is planning to model how changes in weather affect evaporation from lakes. For his first experiment, he wants to test how humidity affects the evaporation rate. He places one beaker with 300 mL of water in a dry area, and he places another beaker with 300 mL of water near a humidifier. Which of the following variables does Pedro need to control during his experiment?
The aim of the experimental model is to test the effect of humidity (changes in weather) on evaporation (rates) from lakes
The control variables in an experiment are the variables that the experimenter intends to keep constant always so as to limit their effect on the measurements of the relationship between the dependent and the independent variable
Therefore in order to have a proper measurement of the effect of humidity on evaporation rate, other variables such as temperature, and the volume of the water in the experiment investigations which affect evaporation rate by the provision of heat, (temperature) and their heat capacity, (the volume and therefore, mass of water) should be controlled
Learn more about controlled variables here;
https://brainly.com/question/2736198
Answer: B: Volume of water and temperature
Explanation:
Just took the quiz
What heat transfer are uv rays from the sun. Radiation, conduction, or convection
Answer:
The ans is Radiation
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If you are in a car that stops suddenly, what does your body continue to do?
Answer:
If the passengers were not wearing their seat belts:, then the passengers in motion would continue in motion. Assuming a negligible amount of friction between the passengers and the seats, the passengers would likely be propelled from the car and be hurled into the air. Once they leave the car, the passengers becomes projectiles and continue in projectile-like motion.
If they were: Any passengers in the car will also be decelerated to rest if they are strapped to the car by seat belts. Being strapped tightly to the car, the passengers share the same state of motion as the car. As the car accelerates, the passengers accelerate with it; as the car decelerates, the passengers decelerate with it; and as the car maintains a constant speed, the passengers maintain a constant speed as well.
I got this from https://www.physicsclassroom.com
A wave is moving between two mediums, as shown in the diagram below. The
wave is slowing down and changing directions. What wave property is
illustrated?
A. Refraction
B. Resonance
C. Diffraction
D. Reflection
Answer:
Uhm i think its a
Explanation:
srry if i get it wrong ._. my bad
Answer:
the correct answer is A
Write your question here (Keep it simple and clear to get the best answer) a car accelerates uniformly from an initial velocity of 10m/s at 2m/s squre for 4s.What is the average velocity
Answer:
Average velocity = 18 m/s
Explanation:
Given the following data;
Initial velocity = 10m/s
Acceleration = 2m/s²
Time = 4 seconds
To find the average velocity, we would use the first equation of motion;
[tex] V = U + at[/tex]
Where;
V is the final velocity.
U is the initial velocity.
a is the acceleration.
t is the time measured in seconds.
Substituting into the equation, we have;
V = u + at
V = 10 + 2*4
V = 10 + 8
V = 18 m/s
On a distance-time graph, which is your independent and dependent variable?
Answer:
On a distance time graph, the distance will always be the dependent variable on the y- axis. Time is the independent variable and will always be placed on the x-axis. The lines on the graphs can tell you many different things.
Explanation:
ANSWER:
the dependant variable is on the y axis and the independent variable is on the x axis.
Recommend An architect wants to design a conference room that
reduces noise coming from outside the room. Suggest some design
features that should be considered in this project.
Answer:
Install sound absorbers such as foam or acoustical panels
Explanation:
They could install some sound absorbers such as foam or acoustical panels in the walls, floors, and ceiling of the conference room.
How can you derive an expression for the block's centripetal acceleration in terms of mass and an angle, and physical constants, as appropriate?
Answer: cause yes they can
Explanation:
How does u know
The weight of a luggage is 69.3 N on the moon. Find its weight on the Earth.
Answer:
415.8N
Explanation:
Given:
weight of a luggage = 69.3 N
But
✓(weight on the Earth) is equivalent to 6 times weight if the moon.
✓Then, weight on the Earth) =( 69.3N × 6)
✓weight on the Earth) = 415.8N
What kind of energy does an electromagnet use to pick up metallic objects?
Answer:
Magnetic energy is used by an electromagnet to pick up metallic objects
Explanation:
An electromagnet generates its own magnetic field in presence of electric current.
As an electric current is induced in an electromagnet , it magnetic dipole arrange themselves in order to behave as a magnet and hence generate magnetic field with a proper north and south. This leads to attraction of metallic object.
Hence, it can be said that Magnetic energy is used by an electromagnet to pick up metallic objects
Which objects generate magnetic fields? Choose more than one
answer.
Magnet
Electric wire with no
current
Electric wire with current
Electromagnet
Paper clip
Metal coin
magnets' persistent magnetic fields.Things that create their own persistent magnetic fields are known as permanent magnets.They have a north and a south pole and are built of magnetized ferromagnetic elements, such as iron and nickel.
More than one solution to the question "what causes a magnetic field?"
may be true.Charged particles that are in motion produce all magnetic fields.Due to the continually moving electrons inside, even the magnet on your refrigerator is magnetic. A magnetic field is produced along the axis of a wire loop by a current flowing through it.Curling the fingers of the right hand in the direction of the current through the loop and pointing the thumb in the direction of the magnetic field will reveal the direction of the field inside the loop. The magnetic field strength of an electromagnet or solenoid, depends on the number (N) of coil turns, the strength of current flowing through the coil in amperes, and its length L. This gives us: H = (NI)/L where NI represents the ampere-turns value.Items made of iron, cobalt, nickel, and steel are drawn to magnets.Paperclips are magnetic because they are often constructed of galvanized steel wire. Any of the following techniques can create a magnetic field:I Any type of magnet, including round, horseshoe, and bar magnets, may be employed.(ii) A current-carrying wire generates a field all around it.(iii) A current-carrying loop or solenoid Electric charges in motion are what generate magnetism.The smallest building blocks of matter are called atoms.There are electrons in every atom, which are charged particles.The electrons that make up an atom's nucleus, or core, spin like tops. Ampere noted that whenever an electrical charge is moving, a magnetic field is created.Similar to how an electrical current flowing through a wire creates a magnetic field, the spinning and circling of an atom's nucleus accomplishes the same.The magnetic field's orientation is determined by the spin and orbit directions. There are only two ways to create a powerful magnetic field.In the first, a solenoid is used, whereas in the second, a solenoid with an iron core is used. Magnetic materials found in nature are connected to magnetic fields.Instead of static charges, a magnetic field can be produced by moving charges.F = QVB, where Q is the charge and V is the charge's velocity perpendicular to the field B, describes the force acting on moving charges in a magnetic field.To learn more about magnetic field refer
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HELP ME PLEASEeeeeèeeeee
9514 1404 393
Answer:
5) 0.64Ω
6) 0.16 W
Explanation:
Put the given numbers into the given formula and do the arithmetic.
5)
[tex]\text{ohms}=\dfrac{\text{volts}}{\text{amps}}=\dfrac{0.32\text{ V}}{0.50\text{ A}}=\boxed{0.64\ \Omega}}[/tex]
__
6)
[tex]\text{watts}=\text{volts}\times\text{amps}=(0.32\text{ V})\times(0.50\text{ A})=\boxed{0.16\text{ W}}[/tex]
Answer:
just ok02
#CARRYONLEARNING
what is the most dense type of stars?
Answer:
A neutron star is the most intensely dense object in all the universe. Of course, the argument can be made that a black hole is the most dense, but considering that a black hole is technically beyond the event horizon, it is neutron stars that get the top spot for the being the ‘most dense’.
Explanation:
:) please mark me as brainliest, thanks
Which is one use of lasers
A. reproducing images to make them clearer
B. Producing a magnified image of the moon
C. Cutting an iron bar into two pieces
D. Making a leaf appear larger so it’s veins are visible
Answer:
c
Explanation:
because what else can the laser be used for
The first published controlled experiment was designed to
A.
disprove bacteria appearing spontaneously from broth
B.
prove that bacteria arise spontaneously from broth
C.
disprove maggots spontaneously arising from rotting meat
D.
disprove cell theory
A student is observing prokaryotic and eukaryotic cells. How can the student determine the difference in the two cells?
Answer:
Prokaryotes are single-celled organisms that do not have a nucleus or any membrane-bound organelles. Eukaryotes are single-celled or multi-celled organisms that do contain a nucleus and membrane-bound organelles
You matter .
Until you Multiply yerself by the speed of Light Squared.
Then you Energy.
Answer:
Hellow ❤️
.
.
Gooood Morning
Answer:
?
Explanation:
I thought we were talking about a Flashpoint or something?
Which process transfers heat from the ground to the air touching it?
A: Conduction
B: Convection
C: Evaporation
D: Radiation
Answer:
its b
Explanation:
i did this question in a test before and i got it right
Function: y = x2 + 5x - 7
Vertex:(
Solutions:(
and
Answer:=7x−7
Explanation:
=2x+5x+−7
=(2x+5x)+(−7)
=7x+−7
A student is blowing against the mouthpiece of a 668mm flute (open at both ends) causing it to resonate. (The air inside and outside the flute is 24.5°C)
1) what is the speed of the sound in the flute?
2) what is the fundamental frequency of the note produced?
3) what is the wavelength of the sound wave?
Answer:
a) v = 345.5 m / s, b) f = 183.8 Hz, c) λ = 1,336 m
Explanation:
a) the speed of sound depends on the density of the medium and this depends on the temperature, therefore
v = [tex]v_o \ \sqrt{1+ \frac{T}{273} }[/tex]
where v₀ is the speed of sound at 0ºC v₀ = 331 m / s
v = 331 [tex]\sqrt{1 + \frac{24.5}{273} }[/tex]
v = 345.5 m / s
c) In the exercise they indicate that the flute is a tube with the two ends open, so that at each end there is a belly, the resonance is
λ / 2 = L
λ = 2L
λ = 2 0.668
λ = 1,336 m
b) let's apply the relationship between speed, wavelength and frequency
v = λ f
f = v /λ
f = 345.5 / 1.336
f = 183.8 Hz
The carbon cycle relies on producers and consumers to survive. What is the role of each in the carbon cycle?
An object travels a distance d with acceleration a over a period of time t according to the equation: d = at² After 2.3 seconds with an acceleration of 9.8 m/s2, how far does an object travel (rounding the answer to two significant figures)?
Answer:
A 26m
Explanation:
firstly the answer will not be part c as distance unit will be meters (m)
next, substitute the values of a and t as shown
[tex]\frac{1}{2} (9.8)(2.3)^2 = 25.921[/tex]
the answer rounded off to 2 significant figures will be hence 26m
True or False? Index Fossils are used to help constrain the relative age of the rocks in an area?
What is the frequency of a wave with a period of 8s?
what is the name often given to the force exerted by the first object on a second object
Answer those 2 questions.
What factors affect Kinetic Energy? a. Mass and Height b. Velocity and Time C. Mass and Velocity d. Mass and Time
What factors affect Potential Energy? a. Mass and Height b. Velocity and Time c. Mass and Velocity d. Mass and Time
Answer:
Q1: c
Q2: a
Explanation:
you can tell the factors by looking at the formulas for kinetic and potential energy
for question 1 look at the formula for kinetic energy
[tex]KE=\frac{1}{2} mv^{2}[/tex]
the variables needed in order to calculate an object's kinetic energy are mass and velocity.
hence, when mass and velocity changes, kinetic energy changes, showing that mass and velocity are the factors affecting kinetic energy
same thing for the second question
[tex]PE = mgh[/tex]
as g (acceleration due to gravity) is considered constant (10 [tex]m/s^{2}[/tex] ) it will not be considered as a factor
and thus, the factors affecting potential energy are mass and height
If a car travels 30 miles in 5 hours, how many miles per hour is the car traveling?
((Please help I need this question in no less than 20 minutes!!!))
Answer:
6 mph
Explanation:
30 miles/5 hours = 6 mph
8. A man takes one minute to lift 4 bags of sugar each of weight 50N
through a height of 1.5m. Calculate the power expanded
A. 1.25W
B. 5.00W
C. 75.00W
D. 300.00W
Lunite of measurements are
Answer:
D
Explanation:
the formula is F=mgh
so now you can write it like
m= 4×50=200
200×1.5×10=30000