Answer:
Strong base
Explanation:
A strong base usually has the pH of between 12 to 14
If the pH of a solution is 12.4, the substance is called a Strong base. Hence, option C is correct.
What are acids and bases?When a substance is dissolved in water, H⁺ hydrogen ions are formed. These substances are called Acids. H⁺ ions are positive ions and hence, they donate protons to other substances.
When a substance is dissolved in water, OH⁻ hydroxyl ions are formed. These substances are called Bases. OH⁻ ions are negative ions that are capable of accepting the protons/hydrogen ions.
Acids are substances having more hydrogen ions than hydroxyl ions and it has a sour taste. Bases are substances having more hydroxyl ions than hydrogen ions and it has a bitter taste.
The acids and bases are differentiated by using the pH scale. pH represents the potential of hydrogen which measures the hydrogen and hydroxyl ions. It is a negative logarithm of H⁺ ion concentration.
The pH scale ranges from 0-14. The neutral power in the pH scale is 7 and the water shows the neutral range. If pH shows less than 7 it is an acidic solution and litmus paper turns red.
If pH shows greater than 7, it is a base or alkaline solution and the litmus paper turns blue. Weak bases range from 7.3-10. Strong bases range from 10-14.
Hence, the pH shows 12.4, which represents a strong base. Thus, the correct solution is C.
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why is a pencil bent when bent in water
Answer:
Refraction
Explanation:
A pencil bends when it enters the water media due to the phenomenon of refraction.
Refraction is one of the properties of waves. Refraction of light occurs which it crosses from a region having different density values. Water is denser than air. As light moves from air to wave it becomes refractedForces have strength, or magnitude, and direction.
True
False
Twenty (20.0) mL of argon gas (Ar) is stored at STP. If the temperature and pressure are both doubled, what is the new volume?
PLZZ ANSWER ASAP!!
Answer:
The new volume is the same as the initial volume, i.e. 20 mL.
Explanation:
To find the new volume we can use the Ideal gas law:
[tex] PV = nRT [/tex]
Where:
P: is the pressure
V: is the volume
R: is the gas constant
n: is the number of moles
T: is the temperature
Initially, we have:
[tex] \frac{P_{i}V_{i}}{T_{i}} = nR [/tex] (1)
In the final state:
[tex] \frac{P_{f}V_{f}}{T_{f}} = nR [/tex] (2)
By equating equation (1) and (2) we have:
[tex] \frac{P_{i}V_{i}}{T_{i}} = \frac{P_{f}V_{f}}{T_{f}} [/tex]
[tex] \frac{P_{i}V_{i}}{T_{i}} = \frac{2P_{i}V_{f}}{2T_{i}} [/tex]
[tex]V_{f} = \frac{2T_{i}*P_{i}*V_{i}}{T_{i}*2P_{i}}[/tex]
[tex] V_{f} = V_{i} [/tex]
[tex] V_{f} = 20.0 mL [/tex]
Therefore, the new volume is the same as the initial volume, i.e. 20 mL.
I hope it helps you!
Momentum,
A ball hits a wall and reverses course. According to
Newton's Third Law, which of these must be true? Select all
that apply.
Choose all that apply
The wall exerts a force on the ball.
The wall moves toward the ball.
The wall moves away from the ball.
The ball moves away from the wall.
The ball exerts force on the wall.
The ball moves towards the wall.
Answer:
THE WALL MOVES AWAY FROM THE BALL
Explanation:
NEWTON'S THIRD LAW STATES THAT THERE IS A OPPOSITE REACTION
which activity performed by a medical professional is primarily based on understanding of physics?
Answer:
Thank you and please rate me as brainliest as it will help me to level up
What is the final velocity of a car that has an initial velocity of 15.2 m/s and accelerates at 3.2 m/s^2 for 2.6 seconds?
Answer:
t=2.59s
Explanation:
v=23.5m/s u=15.2m/s a=3.2m/s^2 t=?
using equation v=u+at t=(v-u)/a t= (23.5-15.2)/3.2=8.3/3.2=2.59s
Which part of an object's rate of change best defines acceleration?
A.position
B.speed
C.velocity
D.force
Answer:
Velocity
Explanation: If you are going down hill, (Which is one direction) you will gain more speed by, gravity, friction, and most importantly velocity.
A girl cycles for 3hrs at a speed of 40 km/h. What distance did she travel? Must show your work
Answer:
120 mExplanation:
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 = 40 × 3
We have the final answer as
120 mHope this helps you
Which planet do you think would be easiest for humans to colonize some day? Explain.
Answer:
I think that Mars would be the easiest planet for humans to colonize because they have already begun working on colonizing Mars and have made a ton of progress.
A cook had a jar containing a sweet food and a jar containing a sour food. The sweet food has a strong attraction between its molecules, and the sour food has a weak attraction between its molecules. At room temperature, both foods are liquids. The cook left both jars in a place where the same amount of energy was transferred into both substances. When she returned, one of the foods had changed phase while the other had not. Which food changed phase, and how did it change?
Answer:
The sweet food changed because the molecules were able to move fast enough to overcome the attraction between them with its molecules now moving away from each other.
Explanation:
We are told that the sweet food has a strong attraction between its molecules, and the sour food has a weak attraction between its molecules.
This means that the molecules in the sweet food would be moving at a faster rate than in the sour food because of the strong forces of attraction. Therefore, the molecules in the sweet food would be moving far away from each other hence the change of phase.
The sweet food changed since the molecules were capable to move fast i.e. sufficient to overcome the attraction between them with its molecules.
information regarding molecules:
The sweet food should contain the strong attraction between its molecules, and the sour food contains weak attraction between its molecules.This represent that the molecules in the sweet food would be moving at a faster rate as compared to the in the sour food because of the strong forces of attraction.Learn more about the molecure here: https://brainly.com/question/19922822?referrer=searchResults
how much force is needed to accelerate a 20 kg mass at a rate of 4 m/s to the second power?
Answer:
So 55 Newtons are needed.
Answer:
80 N
Explanation:
mass (m) = 20kg
acceleration (a) = 4m/s^2
Force (F) = ?
.°. F = ma
= 20 × 4 = 80
.°. F = 80 N
Thus, The Force is needed to accelerate a 20 kg mass at a rate of 4 m/s^2 is 80 N
-TheUnknownScientist
A scientist is testing a fertilizer used to make corn grow taller. The scientist
adds different amounts of fertilizer to each field. He then measures the height
of the corn in each field. What is the manipulated variable in this experiment?
A. The height of the corn
B. The amount of fertilizer
C. The number of experiment groups
D. The number of pieces of corn
the height of the corn maybe
Q #3: You are on the International Space Station (in space) and working on the outside of the Space Station. Your rope holding you to the Space Station snaps and you start to float away. What will happen to you according to Newton's First Law? *
A. You will continue to float away until you suddenly come to a stop.
B. You will continue to float away until you slow down eventually.
C. You will continue to float away at the same speed and in the same direction forever unless an unbalanced force acts on you.
A manufacturer selected a metal to use in producing a lightweight button for clothing. A metal that has a density of 2.71 g/cm3 was selected.
metal, data, metal, mass, grams, volume, centimenters, cubed, 1, 22.1, 3.00, 2, 42.0, 4.00, 3, 9.32, 5.00, 4, 8.13, 3.00,
Which of the metals was selected?
Metal 1
Metal 2
Metal 3
Metal 4
Just find the density of every metal and select the one with a density of 2.71 g/cm³ . This is:
Metal 1
ρ = m/V
ρ = 22.1 g / 3 cm³
ρ = 7.367 g / cm³
Metal 2
ρ = m/V
ρ = 42 g / 4 cm³
ρ = 10.5 g / cm³
Metal 3
ρ = m/V
ρ = 9.32 g / 5 cm³
ρ = 1.864 g / cm³
Metal 4
ρ = m/V
ρ = 8.13 g / 3 cm³
ρ = 2.71 g / cm³
R / Metal 4 was selected.
hi everyone........
Answer:
hiiiiiiiiiiiiiiiiiiiiiiiiii
Answer:
Hiii , how are you holding up with corona?
Explanation:
Question 18 of 20 Planets A and B have the same size, mass, and direction of travel, but planet A is traveling through space at half the speed of planet B. Which statement correctly explains the weight you would experience on each planet? A. You would weigh the same on both planets because their masses and the distance to their centers of gravity are the same. B. You would weigh the same on both planets because your mass would adjust depending on the planet's speed. C. You would weigh less on planet B because it is traveling twice as fast as planet A. O D. You would weigh more on planet B because it is traveling twice as fast as planet A.
Answer:A, you would weigh the same on both planets because their masses and the distance to their centers of gravity are the same
Explanation:
You have arrived at the final accident scene of the day. Two cars of equal mass (2,000 kg each) were involved in a head-on accident at a four-way-stop intersection. Here is what you know:
Car 1 started at rest and coasted toward the intersection from the top of a 50-meter hill.
Car 2 was on a flat stretch of road at the bottom of the hill in front of Car 1.
Answer:
They prolly dead lol.
Explanation:
XD THEY DEAD!!
What are some examples of EM waves
Answer:
MicrowavesHeatwaves Ultraviolent waves WiFi signal4G/5G signalsExplanation:
All of these are examples of electromagnetic radiation or energy.
The spectra comprises most energy and matter we can account for so far.
The main distinction between EM waves and for example longitudinal acoustic waves is the medium of energy transfer (and rules). EMWs are subject to the idiosyncratic effects of Quantum Mechanics while other 'macro' waves whose medium relies on gross material, are apparently not.
For part 3 of 3, just enter magnitude (positve number)
A 1933 kg car has a speed of 14 m/s when it hits a tree. The tree doesn’t move and the car comes to rest.
Find the change in kinetic energy of the car. Answer in units of J.
Find the amount of work done by the car as its front is pushed in.
Answer in units of J.
Find the magnitude of the force that pushed the front of the car in by 38 cm.
Answer in units of N.
Answer:
The change in kinetic energy of the car is -189434 joules.
The work done by the car is 189434 joules.
The magnitude of the force that pushed the front of the car is 498510.526 newtons.
Explanation:
Given that the car is moving on a horizontal ground, by the Principle of Energy Conservation and the Work-Energy Theorem we get the following identity:
[tex]\Delta K+\Delta W = 0[/tex] (1)
Where:
[tex]\Delta K[/tex] - Change in the translational kinetic energy of the car, measured in joules.
[tex]\Delta W[/tex] - Work done by the car, measured in joules.
By applying the defintions of translational kinetic energy and work, we expand and simplify the resulting equation:
[tex]\frac{1}{2}\cdot m \cdot (v_{f}^{2}-v_{o}^{2})+F\cdot \Delta s = 0[/tex] (2)
Where:
[tex]m[/tex] - Mass, measured in kilograms.
[tex]v_{o}[/tex], [tex]v_{f}[/tex] - Initial and final speeds of the car, measured in meters per second.
[tex]F[/tex] - Force exerted by the car, measured in newtons.
[tex]\Delta s[/tex] - Travelled distance of the front of the car, measured in meters.
The change in the kinetic energy of the car and the work done by the car are, respectively: [tex](v_{o} = 14\,\frac{m}{s}, v_{f}= 0\,\frac{m}{s}, m = 1933\,kg, \Delta s = 0.38\,m)[/tex]
Translational kinetic energy
[tex]\Delta K = \frac{1}{2}\cdot m\cdot (v_{f}^{2}-v_{o}^{2})[/tex]
[tex]\Delta K = \frac{1}{2}\cdot (1933\,kg)\cdot \left[\left(0\,\frac{m}{s} \right)^{2}-\left(14\,\frac{m}{s} \right)^{2}\right][/tex]
[tex]\Delta K = -189434\,J[/tex]
Work done by the car
[tex]\Delta W = -\Delta K[/tex]
[tex]\Delta W = 189434\,J[/tex]
Magnitude of the force
[tex]F = \frac{\Delta W}{\Delta s}[/tex]
[tex]F = \frac{189434\,J}{0.38\,m}[/tex]
[tex]F = 498510.526\,N[/tex]
The change in kinetic energy of the car is -189434 joules.
The work done by the car is 189434 joules.
The magnitude of the force that pushed the front of the car is 498510.526 newtons.
We often see cracks on rocks and stones why
Answer:
Due to the process of weathering and erosion.
Explanation:
As the rocks are made of different forms of minerals they may have an igneous, metamorphic or sedimentary origin. Hence the natural stone surfaces can be made of granite, lime, or even shale. The process of physical weathering that is called as mechanical weathering of rocks tends to break them apart and leads to the development of crack and small openings. The diurnal exposure of bare rocks to extreme temperatures of day and night leads to onion peeling and slowly with water as an agent of erosion lead to cracks in joints of rocks.The law of conservation of momentum states that momentum is conserved. This means that if the initial momentum of a system is 50 kg m/s, and
none of the kinetic energy is transformed to any other form, then the final momentum will be
kg m/s.
Answer:
50kgm/s
Explanation:
From the law of conservation of momentum, a system that starts with an initial momentum of 50kgm/s will end up with a momentum of 50kgm/s in its final state.
The law of conservation of momentum states that "in an isolated system, momentum is neither created nor destroyed but transformed from one form to another". From this law, the starting and ending momentum must be the same.Calculate the momentum of the following objects:
a. 75kg speed skater moving forward at 16m/s
b. 135kg ostrich running north at 16.2m/s
c. 0.8 kg kitten running to the left at 6.5 m/s
Answer:
momentum(M in Kgm/s)=mass(m in Kg) *velocity(v in m/s)
a) M=m*v. m=75kg,v=16 m/s
M =75*16
M=1200Kgm/s
b)M=135*16.2
M=2187Kgm/s
c)M = 0.8*6.5
M=5.2Kgm/s
Hope it is helpful?
The momentum of an object having mass
a) 75kg speed skater moving forward at 16m/s is 1200 kg.m/s
b) 135kg ostrich running north at 16.2m/s is 2187 kg.m/s
c) 0.8 kg kitten running to the left at 6.5 m/s is 5.2 kg.m/s
What is momentum ?Momentum is defined as mass times velocity of body. it is denoted by p and its SI unit is Kg.m/s. It has both magnitude and direction. it is a vector quantity.
i.e. p = mv
a) Given,
mass m = 75Kg
velocity v = 16m/s
momentum p = 75× 16 = 1200 kg.m/s
b) Given,
mass m = 135Kg
velocity v = 16.2m/s
momentum p = 135×16.2 = 2187 kg.m/s
c) Given,
mass m = 0.8Kg
velocity v = 6.5m/s
momentum p = 0.8×6.5 =5.2 kg.m/s
Hence momentums of a), b) and c) are 1200 , 2187 and 5.2 kg.m/s respectively.
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how are theories and laws connected
Answer:
Laws are statements about something that's been observed and stated while a theory is an explanation of what's been observed. This connection between them forms a main idea that many people regulate as "what's normal."
Explanation:
Answer:
A hypothesis is a limited explanation of a phenomenon; a scientific theory is an in-depth explanation of the observed phenomenon. A law is a statement about an observed phenomenon or a unifying concept, according to Kennesaw State University. ... However, Newton's law doesn't explain what gravity is, or how it works.
for e.g:
The particle theory and Darwin's theory of human origin.
5.
Classify the following as examples of newton's first law, second law and third law. Justify your
classification. [3marks]
a. A stone in the ground
b. Two people walking together
C. A hammer pushes a nail
Question 7 of 10 A strong magnet is used to separate certain items from other recyclables Which two items found in recyclables would be attracted to the magnet? O A. Cardboard boxes o B. Iron cooking pans O c. Glass mixing bowls O D. Flexible refrigerator magnets
Answer:
D. Flexible refrigerator magnets
B. Iron cooking pans
The strong magnet can attract other magnetic materials from the mixture. They are iron cooking pans and flexible refrigerator magnets. Hence, options B and D are correct.
What are magnetic materials ?Magnetic materials are those having a permanent magnetic dipoles and produces strong magnetic field. Permanent magnets are ferromagnetic in nature. Their magnetic dipoles align along with the applied magnetic field.
A magnetic material can attract other magnet through their opposite poles in contact. Therefore, magnetic materials such as iron, nickel, etc.can be attracted by a bar magnet.
Here, the flexible refrigerator magnets and the iron cooking pans would be attracted to the strong magnet and they can be separated from the other recyclable materials.
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Alice added sodium chloride to water and stirred the water for several minutes. Alice is most likely trying to demonstrate that ionic compounds are hard. can dissolve. are clear. can melt.
sorry im late can dissolve is the answer <3
Answer:
dissolve
Explanation:
A green ball has a mass of 0.525 kg and a blue ball has a mass of 0.482 kg. A croquet player strikes the green ball and it gains an initial velocity of 2.26 m/s. It then strikes the blue ball, which is initially at rest. After the collision, the green ball has a velocity of 1.14 m/s in the same direction. If the balls roll on a frictionless surface and the collision is head-on, what is the final velocity of the blue ball? (Round your answer to the nearest hundredths place.)
Answer:
v' = 1.21 m/s
Explanation:
Mass of a green ball, m = 0.525 kg
Mass of a blue ball, m' = 0.482 kg
Initial velocity of green ball, u = 2.26 m/s
Initial velocity of blue ball, u' = 0 (at rest)
After the collision,
The final velocity of the green ball, v = 1.14 m/s
We need to find the final velocity of the blue ball after the collision if the collision is head on. Let v' is the final velcity of the blue ball. Using the conservation of momentum to find it :
[tex]mu+m'u'=mv+m'v'\\\\0.525 (2.26)+0=0.525 (1.14)+0.482v'\\\\0.588=0.482v'\\\\v'=\dfrac{0.588}{0.482}\\\\v'=1.21\ m/s[/tex]
So, the final velocity of the blue ball is 1.21 m/s.
When you set a heavy bag down on the ground, you are doing _______ work on it.
When you set a heavy bag down on the ground, you are doing negative work on it.
Brandon is flying to the Western United States. His plane manages to cover 700 miles in 2 hours.
thats cool for brandon
Answer:
thats 350 miles an hour, 5.83 miles a minute, .0972 miles a second
Explanation:
A skateboarder starting from rest accelerates down a ramp at 2 m/s for 2 s. What is the final speed of the skateboarder?
Answer: 4m/s
Explanation:
Speed = distance/time.
= 2/2 = 1 m/s
What is speed ?"Speed is defined as the distance travelled by a body per unit time." Its SI unit is m/s.
The distance covered by an object in unit time. In other words, the rate at which the object is moving is called speed
What is distance ?"Distance is the actual path length traveled by an object in the given interval of time during the motion. It is a positive scalar quantity."
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