need help asap please and thank you
Will mark brainliest
Answer: Wouldn't it just be her blocks all walked in an hour added together?
Explanation: 5+2+3+2=12 so 12 blocks an hour?
WILL GIVE BRAINLIEST!! Mary and carl drove to the store to shop. Their trip to the store, time at the store, and trip home is graphed here. What was their average speed for the entire trip?
Answer:
30 km per hour
Explanation:
Answer:
30km/h
Explanation:
test test test
Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he placed the cup outside for several sunny days during the summer. After a week, he observed that only solid salt remained in the cup and the mass had decreased. Henry concluded that a physical and chemical change occurred in this investigation.
Which statements correctly defend or dispute his conclusion?
A- He is correct. Dissolving salt in water is a physical change, but evaporating the water is a chemical change. Formation of a solid is evidence that a chemical change occurred.
B- He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.
C- He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.
D- He is incorrect. Dissolving salt in water and evaporation of the water are both chemical changes. The reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.
Answer:
B- He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.
Explanation: Dissolving Salt in water is a Chemical Change, Because the Salt arrangement is different in solid state than dissolved in water. As we can see in the image below, once the Salt is dissolved, it is separated into its ions, Na+ and Cl- Now, The evaporation process is a physical change, because the water doesn´t change its configuration H20 and it only changes its form, as we can see in the image below.
Answer:
B) He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.
Explanation:
hope this helps!! :)
Once a person passes the age of 65, he or she should stop exercising.
Please select the best answer from the choices provided.
ОТ
OF
Answer: False
People age 65 and older still need exercise. Although the intensity of each workout won't be as high compared to younger ages. Everyone needs exercise to keep their heart healthy, to lower the bad cholesterol, etc.
Answer:
no
Explanation:
very false
wut happens to energy wen it is used
Answer:it gets converted to light energy
Explanation:hope this helps
A 40 kg girl is pushing a 40 kg boy in a 20 kg toy wagon. The wagon is moving at a constant speed of 2.0 m/s. Calculate the combined kinetic energy of the boyWhat is the acceleration of a 50 kg object pushed with a force of 500 newtons?
Answer:
Combined kinetic energy =120 joules
Acceleration= [tex]10 m/s^2[/tex]
Explanation:
Given that the mass of the girl= 40 kg.
The mass of the boy= 40 kg.
The mass of the wagon = 20 kg.
The combined velocity of the boy and the wagon, v= 2.0 m/s.
The kinetic energy of any object having mass m and moving with the speed of v m/s, is
K.E.= [tex]\frac 1 2 mv^2[/tex].
Here, the combined mass of the boy and the wagon = 40 + 20 = 60 kg.
So, the combined kinetic energy of the boy and the wagon
[tex]=\frac 12 60 \times 2^2= 120[/tex] J
When a force is applied on the object having the mass m, then
F=ma,
where a is the acceleration produced in the object.
Here, F=500 newtons and m= 50 kg.
so, [tex]500=50\times a[/tex]
[tex]\Rightarrow a = 500/50=10 m/s^2[/tex].
Hence, the combined energy is 120 joules and the acceleration is 10 [tex]m/s^2[/tex].
A push of magnitude P acts on a box of weight W as shown in the figure. The push is directed at an angle θ below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The normal force on the box due to the floor is equal to
Answer:
its on wheels and they are supposed to make it eas
Explanation:
4. The earth exerts a gravitational force of 3.5 N on an object. What is the mass of
the object in kilograms? *
Answer:
I'm not sure
Explanation:
sorry I'm not smart that's why I have this app
Answer:
(3.5N)/(10) = 0.35
Explanation:
What is the momentum of a 10 kg object traveling at 4 m/s?
how many molecules are in 3 moles of CO2
Answer:
1.806 x 10^24 molecules
Explanation:
1 mole of CO2 has 6.02 x 10^23 molecules
3 mole of CO2 has 3x6.02x10^23 molecuels = 1.806 x 10^24 molecules
The 3 mole of [tex]CO_{2}[/tex] contains [tex]1.8066*10^{24}[/tex] molecules.
One mole of [tex]CO_{2}[/tex] contains [tex]6.022*10^{23}[/tex] molecules.
In 3 moles of [tex]CO_{2}[/tex] ,
[tex]=3*6.022*10^{23}=1.8066*10^{24}[/tex] molecules.
Hence, the 3 mole of [tex]CO_{2}[/tex] contains [tex]1.8066*10^{24}[/tex] molecules.
Learn more:
https://brainly.com/question/22016398
Does light slow down or speed up when it passes from the air into the cornea? How do you know this?
why the hell not 86 points
Answer:
what I dont understand
A rubber stopper attached to a string is travelling in a circular path above a students' head. If the radius of the circle that the stopper is travelling is 0.5m and it takes 2.0 s for the stopper to make one complete revolution, what is the velocity of the rubber stopper?
Answer: 1.57 m/s
Explanation:
What kind of small objects composes much of the universe?
- Atoms
- Dark Matter
- Anti-Matter
What 3 things use electromagnetic energy in nature?
active listening definition
Answer:
Active listening is a technique that is used in counseling, training, and solving disputes or conflicts. It requires that the listener fully concentrate, understand, respond and then remember what is being said. This is opposed to other listening techniques like reflective listening and empathic listening.
Explanation:
What is the velocity of a 0.06
kg ball moving with 75 J of energy?
Answer:
The ball moves at 50 m/s
Explanation:
Kinetic Energy
Is the energy that it possesses an object of mass m due to its motion at speed v. The kinetic energy is calculated as follows:
[tex]\displaystyle K=\frac{1}{2}m\cdot v^2[/tex]
If we know the value of the kinetic energy and need to calculate the speed, we can solve it for v:
[tex]\displaystyle v=\sqrt{\frac{2K}{m}}[/tex]
Since the ball has a mass of m=0.06 kg and moves with a kinetic energy of K=75 Joule:
[tex]\displaystyle v=\sqrt{\frac{2\cdot 75}{0.06}}[/tex]
[tex]\displaystyle v=\sqrt{\frac{150}{0.06}}[/tex]
[tex]\displaystyle v=\sqrt{2500}[/tex]
v=50 m/s
The ball moves at 50 m/s
Answer:50m/s
Explanation:divide
A high-speed train travels with an average speed of 227 km/hr. The train travels for 2 hours. How far does the train travel?
Answer:
454 kmExplanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
distance = velocity × time
From the question we have
distance = 227 × 2
We have the final answer as
454 kmHope this helps you
What is a living thing?
The answer to the question is an orgamisn
Answer:
The thing having life are called living things
What’s the kinetic energy of the object? Use .
Erica is competing in the shot put event at a track meet. She hurls a shot with a mass of 4 kilograms at a speed of 9 meters/second. The shot’s kinetic energy is
joules.
Answer:
18joules
Explanation:
1/2 of 4=2
2 multiply by 9= 18 joules
Mary slams her breaks and the coffee cup sitting in the dashboard spill everywhere, what Newton law of motion explains why the coffee cup spilled.
Answer:
inertia
Explanation:
a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
aka
it goes on because nothing is resisting it, in this case however, the car is there to stop it, and the result is spilled coffee (rip)
what sould you do after losing a game
Answer:
Rage :)
Raging lets ur anger out :)
Answer:
After losing a game in whatever it is, you should figure out what you did wrong to lose whatever game you lost and practice more at it. You should also have good sportsmanship because it builds teamwork, character, respect, honor in whatever you are playing.
Hope this helped :)
The table below shows the height of some horse fossils.
Horse Fossil RecordHorse Fossil Height (cm)
W 52
X 135
Y 38
Z 100
Ancient horses were much smaller than present-day horses. The present-day horse is 140 centimeters tall. What is the correct order of evolution of the horse starting from the oldest fossil?
X Z W Y
Y W Z X
W Y X Z
Z X W Y
Answer:
Y W Z X, B
Explanation:
It wants you to figure out the correct order starting from oldest to newest.
Answer:
Y W Z X, B
Explanation:
I took the FLVS test :)
Why do many people want to use renewable energy like solar energy or hydroelectric energy instead of energy from coal?
pls help asap will mark as brainliest if correct!
Answer:
Explanation:
Solar energy is efficently present naturally , whereas coal and natural gas are more efficient by reliable applications, things like coal and natural gases are also non renewable they also cause pollution .so using solar enery are better than coal and natural gases.
PLEASE HELP. I'LL GIVE BRAINLIEST TO CORRECT ANSWER.
There are several ways to model a compound. One type of model is shown.
4 C's are connected in a line by 3 black lines. The C on the left has 3 H's attached to it each by a black line. The next C has 1 H attached by a black line and 1 O attached by 2 black lines. The next C has 2 H's attached to it by 1 black line each. The last C has 2 H's attached to it by 1 black line each and 1 O attached by a single black line. That O has an H attached to it by 1 black line.
What is the chemical formula for the molecule represented by the model?
CHO
C4H9O2
C4H8O
C3H8O2
Answer:
C
Explanation:
Edge2020
A race car starts from rest and accelerates uniformly to 69 mph in 4.5 s.
Determine the acceleration of the car in units of m/s2
A. 0.0 m/s2
B. 0.15 m/s2
C. 4.9 m/s2
D. 6.9 m/s2
Ummmm ya girl needs help
hydrogen: 4
nitrogen: 4
oxygen: 12
this should be correct
Si se sumerge un cuerpo cuya densidad es 3kg/m3 en un lugar líquido cuya densidad es de 25kg/m3 en cuerpo... Flota en equilibrio a dos aguas?O se hunde? O flota
Answer:
Flota.
Explanation:
Cuando sumergimos un objeto en un fluido, si la densidad del objeto es menor a la densidad del fluido, entonces el objeto flotara.
Si la densidad del objeto es exactamente igual que la densidad del fluido, entonces se dice que el objeto flota a dos aguas.
De tal forma que la flotación en si estará definida por el volumen del objeto, pues el peso del fluido desplazado sera igual al peso del objeto.
En este caso tenemos:
La densidad del objeto es 3kg/m^3
La densidad del liquido es 25kg/m^3
Entonces la densidad del liquido es mucho mayor que la densidad del objeto, de esto podemos concluir que el objeto no flota a dos aguas, solamente flota.
What is its displacement ?
Answer:
d
Explanation:
