Answer:c
Explanation:
Answer:
c
Explanation:
A fan that is switched on for 1 minute uses 500 W usefully but also wastes 300 W through the emission of sound and heat. What's the efficiency of the fan?
Explanation:
Efficiency is defined as the ratio between the useful output over the total amount consumed. [tex]E = \frac{useful}{total}[/tex]
The fan does 500W of useful work while wasting 300 W. The total power consumption is 800 W (500 + 300).
Question 25
2.5 pts
Which of the following statements describes a difference
between a chemical change and a physical change in a
substance?
Tim
Attei
231
o The result of a chemical change is a different
composition; in a physical change, the composition
remains the same.
o A physical change occurs only in elements: a
chemical change occurs only in compounds.
O A chemical change occurs only in elements; a
physical change occurs only in compounds.
The result of a physical change is a different
Answer:
o The result of a chemical change is a different composition; in a physical change, the composition remains the same.
Explanation:
In a chemical change, new kinds of matter are produced although the atoms are the same.
For physical changes, no new kinds of matter formed. Only the state of substances changes.
Most chemical changes are usually irreversible Physical changes are reversible in most parts. Changes in state and form are salient characteristics of physical changes. When new products are formed from the reactants, it is an indicator of a chemical change.An oxygen atom picks up two additional, free-floating electrons. Is the charge of the newly formed oxygen ion positive, negative, or neutral?
Answer:
The atom is now a negative charge
Explanation:
Adding electrons makes things negative.
Why are paperclips attracted to magnets? Group of answer choices They contain silver They contain aluminum They contain tin They contain iron
Answer:
They contain iron.
Explanation:
Iron is made of metal and magnets attract to metal Iron.
Ten children measured and recorded how high they could jump. The results they recorded, in inches, were as follows:
8, 9, 8, 6, 8, 12, 9, 10, 11, 16
What is the median of these measures?
DEFINE SIGNIFICANT DIGITS.
Answer:
Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value. We start counting significant figures at the first non-zero digit. Calculate the number of significant figures for an assortment of numbers.
Explanation:
any of the digits of a number beginning with the digit farthest to the left that is not zero and ending with the last digit farthest to the right that is either not zero or that is a zero but is considered to be exact. — called also significant figure.
can you help me I am in trouble plz help
Answer:
A velocity
B acceleration
C ms^-2
A hockey puck slides across an ice lake on a straight path and eventually comes to a stop. This is an example of which of Newton's Laws?
Answer:
Newton first law
Explanation:
Newton's first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. The hockey puck moved because you hit it. ( tell me if I helped I hope you do good)
18. Compare the momentum of a 5450 kg truck moving at 8.00 m/s to the momentum of a 2725 kg car moving at 16.0 m/s.
Answer:
They are equal
Explanation:
Multiply the mass by the velocity.
HELP!!!!
Clouds form when the air is cooled below the
dew point
relative humidity
water content
percent saturation
Answer:
Clouds form when below the dew point
Clouds form when the air is cooled below the dew point. The dew point is the temperature at which the air becomes saturated, meaning it can no longer hold all the water vapor it contains. The correct answer is the dew point.
When the air cools below this temperature, the excess water vapor condenses into tiny water droplets or ice crystals, forming clouds.
The dew point is an important concept in meteorology and refers to the temperature at which the air becomes saturated, leading to the formation of dew, fog, or clouds. It is the temperature at which the air can no longer hold all the water vapor it contains, resulting in the condensation of water vapor into liquid water droplets.
When air is cooled, its capacity to hold water vapor decreases. As the temperature drops, the air reaches a point where it becomes saturated, meaning the air is holding the maximum amount of water vapor it can at that specific temperature and pressure. This temperature is known as the dew point.
Therefore, while relative humidity, water content, and percent saturation are relevant factors in understanding the moisture content of the air, clouds specifically form when the air is cooled below the dew point. The correct answer is the dew point.
For more details regarding dew point, visit:
https://brainly.com/question/15313810
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Timed!! please help i would really appreciate it! i will try to give brainliest!
Craig rides a skateboard on the sidewalk in front of the mall, traveling at 18km/h. How much time would it take him to travel 6.0km?
Answer:
20 minutes
Explanation:
.....
.........
( Interactions of the Earth) (Moon, and Sun: Mastery Test Place) the phases of the Moon in the correct order, starting with the new Moon. first-quarter Moon 1 new Moon full Moon 1 gibbous Moon crescent Moon |
Answer:
crest moon
Explanation: because you ar etalking about moons
Fill in the blank: A _____________ circuit is when there is only one path to and from the power source.
Answer:
Series.
Explanation:
Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.
Mathematically, Ohm's law is given by the formula;
[tex] V = IR[/tex]
Where;
V represents voltage measured in voltage.
I represents current measured in amperes.
R represents resistance measured in ohms.
A series circuit is when there is only one path to and from the power source. Thus, the amount of current flowing through the circuit is the same while the voltage is given by the summation of each voltage across each component in the electrical circuit.
Two reindeer-in-training pull on a sleigh. Connie pulls with a force of 200
Nat an angle of 60 degrees above the x-axis, while Randolph pulls with a
force of 800 N at an angle of 60 degrees below the x-axis. What is their
resultant force on the sleigh?
Answer:
Their resultant force magnitude on the sleigh is approximately 583.095 N
Explanation:
The given parameters are;
The magnitude and direction in which the two reindeer-in-training pull on the sleigh are;
The force with which Connie pulls on the sleigh, F₁ = 200 N
The direction in which Connie pulls on the sleigh = 60° above the x-axis
The force with which Randolph pulls on the sleigh, F₂ = 800 N
The direction in which Connie pulls on the sleigh = 60° below the x-axis
The vector form of the force with which the two reindeer-in-training pulls the sleigh is given as follows;
[tex]\underset{F_1}{\rightarrow}[/tex] = 200 × cos(60°)·i + 200 × sin(60°)·j = 100·i + (100·√3)·j
[tex]\underset{F_2}{\rightarrow}[/tex] = 800 × cos(60°)·i - 800 × sin(60°)·j = 400·i - (400·√3)·j
The resultant force, R = [tex]\underset{F_1}{\rightarrow}[/tex] + [tex]\underset{F_2}{\rightarrow}[/tex]
∴ R = 100·i + (100·√3)·j + 400·i - (400·√3)·j = 500·i - (300·√3)·j
Their resultant force magnitude on the sleigh, [tex]\left | R \right |[/tex] = √(500² + (-300)²) ≈ 583.095 N
The direction of the resultant force = arctan(-300/500) = arctan(-0.6) ≈ -30.964 which is approximately 30.964° below the x-axis.
PLAESE ANSWER FAST!!!!! MAKE SURE IT"S RIGHT
How are humans changing the carbon cycle?
Question 2 options:
Humans are burning carbon and putting it into the atmosphere.
Humans are planting more trees to add more oxygen to to the carbon cycle.
Humans are adding carbon to the Earth by over-farming.
Question 3 (0.2 points)
Three hundred years ago, the amount of CO2 flowing into the atmosphere was equal to the amount flowing out of the atmosphere. This is not true today.
Question 3 options:
True
False
Question 4 (0.2 points)
How does carbon dioxide affect the Earth's climate?
Question 4 options:
While carbon dioxide is in the air waiting to be reabsorbed it traps the sun's heat.
Carbon dioxide mixes with water vapor to take harmful chemicals out of the air.
Carbon dioxide is being added to the soil, which causes weather phenomenon.
(if you have Q1: Carbon is found in: living animals and plants, oceans, rocks, atmosphere, and fossil fuels)
Q2: Humans are burning carbon and putting it into the atmosphere.
Q3: True
Q4: While carbon dioxide is in the air waiting to be reabsorbed it traps the sun's heat.
(and if you have Q5: In the last 250 years, the amount of carbon in the air has increased by 40 percent.)
The useful energy from a computer is carried away from the computer by sound and what else?
light
Explanation:
a computer has a screen and speakers, which produce light and siund
The blades of your skates slide more easily over ice than do
the soles of your shoes because the skate blades
a
are smoother than your shoes.
b exert less force on the ice.
C
make you weigh less on the ice.
d
none of the above.
Answer:
A
Explanation:
They Are Smoother and the other guy makes no sense.
Answer it fast and no spamming....! !
Example 1: Three resisters 10 12,20 ,30 12 ohms, are connected in
(a) Series (b) Parallel. Find the resultant resistance in the circuit.
answer correctly!✌️
Answer:
When the resistances are connected in the parallel the equivalent resistance will be always less than the value of the lowest resistance in the parallel circuit.
The equivalent resistance in the parallel circuit can be calculated using the following formula.
1/R=1/R1+1/R2+1/R3
1/R= 1/10+1/20+1/30
1/R=(6+3+2)/60
1/R=11/60
R=60/11
R=5.45 Ohms
An engineer wants to double the water supply reserve and makes a tank 1.26 times as big as the old one in linear dimension, and the diameter of the legs is 1.41 times as large. Is this big enough?
Answer:
Yes, it would be enough.
Explanation:
The volume of the tank (cylinder tank) is given by the following equation:
[tex]V_{initial}=\pi (\frac{D}{2})^{2}h[/tex]
Where:
D is the diameter of the tank
h is the height of the tank
Now, the engineer makes a tank 1.26 times as big in heigh and 1.41 times as large with respect to diameter, then the new volume of this tank will be:
[tex]V_{new}=\pi (\frac{1.41D}{2})^{2}1.26h[/tex]
[tex]V_{new}=1.41^2*1.26\pi (\frac{D}{2})^{2}h[/tex]
[tex]V_{new}=2.51\pi (\frac{D}{2})^{2}h[/tex]
in terms of the initial volume:
[tex]V_{new}=2.51V_{initial}[/tex]
Which means that the volume of the water could be doubled.
I hope it helps you!
An object has an acceleration of 18.0 m/s/s. If the net force
acting upon this object were halved (i.e., one-half of the
original net force), then its new acceleration would be
m/s/s.
Answer:
[tex]9\ m/s^2[/tex]
Explanation:
Net Force
The Second Newton's law states that an object acquires acceleration when an external unbalanced net force is applied to it.
The acceleration is proportional to the net force and inversely proportional to the mass of the object.
It can be expressed with the formula:
[tex]\displaystyle a=\frac{F_n}{m}[/tex]
Where
Fn = Net force
m = mass
An object has an acceleration of [tex]18\ m/s^2[/tex], thus:
[tex]\displaystyle \frac{F_n}{m}=18\ m/s^2[/tex]
If the new force is halved:
F' = F_n/2, the new acceleration will be:
[tex]\displaystyle a'=\frac{F_n/2}{m}[/tex]
[tex]\displaystyle a'=\frac{1}{2}\cdot\frac{F_n}{m}[/tex]
Substituting the given acceleration:
[tex]\displaystyle a'=\frac{1}{2}\cdot 18\ m/s^2[/tex]
[tex]\displaystyle a'=9\ m/s^2[/tex]
The new acceleration is [tex]9\ m/s^2[/tex]
3 points
1. Using the digram below, determine which two atoms have the same
atomic number. *
8P
8N
9P
8N
8P
9N
10P
9N
2 and 3
o
2 and 4
1 and 3
ОО
3 and 4
3 points
2. The diagram below is a modern drawing of an atom. Why are no
electrone orbits drawn? *
Answer:
1 and 2 because atomic number is equal to the numbers of protons in the nucleus
Answer:
yes answer in 1 and 2 these is answer
A ball droped from a building. How fast is it traveling after falling 3.55s
Answer:
d = 61.75 m
Explanation:
Given that,
A ball droped from a building.
We need to find how fast is it traveling after falling 3.55 s.
As it is dropped, its initial velocity is equal to 0.
Let d is the distance it covers after falling 3.55 s.
We can use second equation of motion to find d.
[tex]d=ut+\dfrac{1}{2}at^2[/tex]
Here, u = 0 and a =g
[tex]d=\dfrac{1}{2}gt^2\\\\d=\dfrac{1}{2}\times 9.8\times (3.55)^2\\\\d=61.75\ m[/tex]
So, it will cover 61.75 m after falling 3.55 seconds.
Two descriptions about physical quantities are given below:
Quantity A: It has the same unit as force.
Quantity B: It measures the amount of matter in an object.
What quantities are these most likely describing?
Both Quantity A and Quantity B are mass.
Both Quantity A and Quantity B are forces.
Quantity A is weight and Quantity B is mass.
Quantity A is mass and Quantity B is weight.
Answer:
quantity A is mass and quantity B is wright
If the speed of an object increases, the kinetic energy will ______________ because _____________________________________.
Calculate the pressure of water at depth 10metre given that:Density of water=1000 kg/m^3
Answer:
We begin by solving the equation P = hρg for depth h: h=Pρg h = P ρ g . Then we take P to be 1.00 atm and ρ to be the density of the water that creates the pressure.
Explanation:
if it helps problem doesn't sorry
A boy starts from point A and walks 3 meters toward the south, then turns around and walks 7 meters toward the north. What is the boys placement from point A?
Answer:
-3m+7m = 4m
Explanation:
As he walks south, he is going down 3m (-3m). Then he walks up 7m (+7m).
You subtract the final position from the initial position to get displacement.
7m - 3m = 4m
Maya uses a tuning fork of frequency 250 Hz to produce transverse wave on a stretched string. Her friend justin measure the distance between the two consecutive crest on the string as 5 cm.What was the velocity of the wave?
Answer:6.25m/s
Explanation:
V=F*lander
V=FL/2=250*0.05/2
HELP MEEEEEEEEEEEEEEEEE
Answer:
The metal screw is pushing on the magnet.
PLEASE HELP!!!!
People can expect worldwide governmental agencies and regulations to "clean up" all the environmental problems.
True
False
Answer: Local governments can resolve a conflict by cooperating and spreading the costs of expensive projects. What kinds of problems cause state governments to help local governments? No economic growth or improvements are problems that cause governments to help local governments.
Answer its false
Explanation:
Put the events in order to explain how radios work.
Radio waves are converted to sound waves
Sound waves are changed into electrical
Radio waves are released by transmitter
by radios
signals by microphones.
towers.
Answer:
1. Sound waves are changed into electrical
2. Radio waves are released by transmitter
by radios
3. Radio waves are converted to sound waves
Explanation:
Answer:
The person in front of me is right
Explanation:
There’s my proof
