Answer:
f= mass/acceleration
Explanation:
f= 95/2.2
If the pH of a substance is 12.4, the substance is a _______
- strong acid
- weak acid
- strong base
- weak base
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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A ball of mass m is suspended from two strings of unequal length as shown. The magnitude of the tensions T1 and T2 in strings must satisfy which of the following relations?
Let θ₁ and θ₂ denote the angles made by the tension forces T₁ and T₂ with the positive horizontal axis (directly to the right), respectively. (BTW, I write T₁ in boldface for the vector and T₁ for its magnitude.)
The ball is kept in equilibrium, so by Newton's second law both the net horizontal and net vertical forces are zero. This means
[1] T₁ cos(θ₁) + T₂ cos(θ₂) = 0
[2] T₁ sin(θ₁) + T₂ sin(θ₂) - m g = 0
Both cos(x) and sin(x) fall within -1 and 1 for any angle x, so right away we know that
T₁ sin(θ₁) + T₂ sin(θ₂) ≠ T₁ + T₂
so option (B) is not correct.
If T₁ = T₂, then in equation [1] we get
T₁ cos(θ₁) + T₁ cos(θ₂) = 0
T₁ (cos(θ₁) + cos(θ₂)) = 0
cos(θ₁) + cos(θ₂) = 0
which means θ₁ = 180° - θ₂, since cos(180° - x) = - cos(x) for any x. But this would require both strings to have the same length. So option (C) is also not correct.
The horizontal components of T₁ and T₂ are the only forces acting in the horizontal direction, so their horizontal components are equal. However, the vertical component of T₂ is closer to being parallel to the weight of the ball, which means T₂'s vertical component is almost enough on its own to counteract the ball's weight. This in turn means that (D)T₂ > T₁.
In other words, sin(θ₂) is closer to 1 than sin(θ₁), and T₂ is closer to m g than T₁.
If a substance containing charged ions and electrons can be compressed so that the particles have less space between them, the substance is a
gas.
plasma.
solid.
liquid.
Answer: plasma
Explanation: plasma has charged particles called ions, and free electrons
3. Can object going in different directions at the same
speed have the same velocity? Why or why not?
4. If 1 car is going faster than another traveling in the same
direction, can they have the same velocity? Why or why not?
15 points I need help please ???
Answer:
3/4.no because there going in diffrent directions
Explanation:
37 Questions - All Questions Are Required
Score 1
2 A car's velocity decreases from 22.0 m/s to 10.0 m/s over a period of 3.0 s. What is the car's average acceleration?
The required car average acceleration over a period of 3.0 s is -4.0 m/s².
What is acceleration?The rate of change of velocity with respect to time is called acceleration.
Here,
The average acceleration of a body is given by the formula,
average acceleration = (final velocity - initial velocity) / time taken
In this case, the initial velocity of the car is 22.0 m/s, the final velocity is 10.0 m/s, and the time taken is 3.0 s. Therefore, the average acceleration of the car can be calculated as:
average acceleration = (10.0 m/s - 22.0 m/s) / 3.0 s
average acceleration = -12.0 m/s² / 3.0 s
average acceleration = -4.0 m/s²
Note that the negative sign indicates that the car is decelerating, or slowing down.
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Which has only a thin atmosphere?
Answer:
Mercury
Mercury. Mercury is the smallest terrestrial planet in the solar system, about a third the size of Earth. It has a thin atmosphere, which causes it to swing between burning and freezing temperatures.
Explanation:
hope it helps, mark brainliest please
A person is lifted 24 meters by the elevator in a building. If the
person has a mass of 74 kg, what is the gravitational potential
energy gained by the person? Estimate g to 9.81 and keep 5
significant figures.
Answer: 17,423 J
Explanation:
Potential Energy = mass x gravity x height
PE = 74kg x 9.81m/s^2 x 24 m
PE = 17,423 J
The required value of gravitational potential energy gained by the person is 17422.56 J.
Given data:
The lifting height is, h = 24 m.
The mass of person is, m = 74 kg.
The energy possessed by the person by virtue of its position is known as gravitational potential energy of the person. The expression for the gravitational potential energy of person is given as,
U = mgh
Here,
g is the gravitational acceleration.
Solving as,
[tex]U = 74 \times 9.81 \times 24\\\\U =17422.56\;\rm J[/tex]
Thus, we can conclude that the required value of gravitational potential energy of person is 17422.56 J.
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A copper wire is connected across a constant voltage source. Which change will cause an increase in the current flowing through the wire? A. an increase in the length of the wire B. an increase in the resistance of the wire C. an increase in the diameter of the wire D. an increase in the insulation around the wire
Answer:
B
Explanation:
"The more conductive something is, the less resistance it will have."
A copper wire is connected across a constant voltage source. An increase in the length of the wire will cause an increase in the current flowing through the wire.
What is resistance of wire?Resistance is proportional to resistivity and length, and inversely proportional to cross sectional area.
[tex]R =\dfrac{\rho l}{A}[/tex]
Where,
ρ is resistivity of wire which is same for a material.
[tex]l[/tex] is length of wire.
[tex]A[/tex] is cross sectional area .
For constant voltage and increase in current flowing through the wire, one have to increase the resistance of the wire. That means we have to increase the length of wire.
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What characteristics consider as consider as foundation of an effective officiating official?
A competence
B compassion
C confidence
D courage
Answer:
c
Explanation:
What is the speed of the netball as it hits
the ground? Use the information from 1.5m
above ground level
mass= 0.4
Answer:
v = 5.42 [m/s]
Explanation:
To solve this problem we have to use the concept of energy transformation which tells us that kinetic energy is transformed into potential energy and vice versa.
The potential energy can be defined by means of the following equation.
Ep = m*g*h
where:
m = mass = 0.4 [kg]
g = gravity acceleration = 9.81 [m/s²]
h = elevation = 1.5 [m]
Ep = 0.4*9.81*1.5
Ep = 5.88 [J]
Since the potential energy is equal to the kinetic energy, we can find the velocity by means of the kinetic energy equation.
Ek = 0.5*m*v²
where:
Ek = kinetic energy = 5.88 [J]
5.88 = 0.5*0.4*v²
v = 5.42 [m/s]
Use GRESA Method to solve for the amount of current that will flow in a lamp with a resistance of 40 ohms when the voltage across the lamp is 15 V.
Help po plss asap answer
Answer:
the amount of current that will flow in a lamp is
Q = C. U = 40.15 = 600 (c)
with Q is the amount of current that will flow in a lamp
Explanation:
A player throws a javelin at an unknown angle with a horizontal velocity 20 m/s and vertical velocity 60 m/s. Find its angle and resultant velocity.
Answer:
63º~64º
Explanation:
so imagine a graphic with a triangle. The distance between the zero and the horizontal (x) is 20 and the distance between 0 and vertical (y) is 60
20 = base
60 = height
hypotenuse = L
tg = cato/cata
tg = 60/20
tg = 2
I give up
5. The measurement of the amount of friction a surface will generate is called the ___
of friction'
Do you guys know ?
Answer:
The meaurement of the amount of friction a surface will generate is called the coefficient of friction.
The measurement of the amount of friction a surface will generate is called the coefficient of friction.
The frictional force is a force that opposes the force between two objects in contact.For a body on a smooth surface, friction between the body and the surface is known as the coefficient of friction.The smaller the coefficient of friction, the more the object tends to slide on the surface.
Hence we can conclude that the measurement of the amount of friction a surface will generate is called the coefficient of friction.
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20 J of energy was used to
stretch a spring with a
spring constant of 445 N/m,
what is the final extension
of the spring?
Answer:
0.3m
Explanation:
Given parameters;
Elastic energy = 20J
Spring constant = 445N/m
Unknown
Final extension of the spring = ?
Solution:
The elastic potential energy of a stretched spring can be determined using the expression below;
EP = [tex]\frac{1}{2}[/tex] k e²
k is the spring constant
e is the extension
Insert the parameters and solve;
20 = [tex]\frac{1}{2}[/tex] x 445 x e²
multiply those sides by 2;
2(20) = 445e²
40 = 445e²
e² = [tex]\frac{40}{445}[/tex] = 0.09
e = √0.09 = 0.3m
.An iron nail sinks in water but a ship made of the same materials floats on water. why?
Answer:
Because their is an air pocket at the bottom of a boat air is lighter than water so it floats
Explanation:
....
Answer:
lau aba clear hunxau timi
Restaurant owners agree to comply with state, but not federal, health
regulations when applying for a public health license. true or false
Answer:
False.
Explanation:
A public health license can be defined as series of privileges and authority granted to a practitioner in the public domain, to offer services to the general public after admitting to comply with the standards, rules and regulations set aside by health regulatory agencies and the government (both state and federal).
This ultimately implies that, all restaurant owners must have met the minimum requirements (criteria) and agree to comply with all the standards, rules and regulations with respect to public health before they are endorsed and then given a license to practice or operate by the appropriate agency or authorities.
Hence, restaurant owners agree to comply with state, federal, and health regulations when applying for a public health license.
If 32 g of copper(II) sulfate are dissolved in 100 g of water at 20°C, is the solution produced saturated, unsaturated, or supersaturated?
When copper sulfate is dissolved in water, the solution produced is saturated.
What is saturated solution?When the solute added over and over is no more able to dissolve, the solution formed is saturated.
For a certain amount of solvent, temperature and pressure, the solute is unable to dissolve and precipitate or from crystals. This condition is best termed as the saturated solution. So, the solvent can not dissolve any more solute.
Thus, the solution produced is saturated.
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What will this be ? Help me out
Answer:
7: C 8:All of These
Explanation:
Im almost 100% sure on both of these. Feedback is like critism and you'll get nowhere focusing on all good and no bad. You can't go to the doctor on your own if you're a child for technically it's both yours and your parents. Your teacher is responsible for notifying your parents and you are responsible for telling your teacher.
A ball is kicked off a 75 m tall cliff with a horizontal velocity of 5 m/s. How long till it reaches the ground? How far will the ball land from the base of the cliff?
Let, time taken is t.
So,
[tex]s=ut + \dfrac{gt^2}{2}\\\\75 = 0 + \dfrac{10\times t^2}{2}\\\\150=10\times t^2\\\\t = \sqrt{15}\\\\t = 3.873\ s[/tex] ( Here, us is vertical component of initial velocity )
Now, distance covered from the base of the cliff is :
[tex]D=5\times 3.873\ m\\\\D = 19.365\ m[/tex]
Therefore, time taken and distance covered is 3.873 s and 19.365 m.
Hence, this is the required solution.
Mechanical weathering is also called ______weathering
Answer:
physical
Explanation:
physical weathering and disaggregation, causes rocks to crumble. Water, in either liquid or solid form, is often a key agent of mechanical weathering. For instance, liquid water can seep into cracks and crevices in rock.
17.food that is both nutrient- and calorie-dense can be a good choice in what circumstance?
A. When it is high-glycemic
B.When it contains trans fats
C.When it contains more than 400 calories per serving
D.When it is portion-controlled
Answer:
Explanation: you can choose B or C but i would choose C
A 3.00 kg crate is pulled along a frictionless surface with a force of 55.0 N at 25.00 to the
horizontal so that it accelerates directly to the right. What is the crate's acceleration?
if you weigh 88 N on the moon when the gravity 1.6m/s2 what is your mass
if solid figures have parallel bases and lateral faces how the base will be perpendicular the lateral face
Each face of a solid figure is called either a base or a lateral face. Solid figures generally have one or two bases. If it has two, these bases are parallel. If a figure has two parallel bases and lateral faces, such as in a prism, the bases will be perpendicular to the lateral faces.
cells are considered the smallest part of an organsim that can?
Which statement is a scientifically accurate description of velocity?
The motorcyclist traveled along a highway at 55 mph and reached the campsite in less than the two-hour estimated time.
Walking south along the two-mile canyon trail generally takes less time than traveling the same trail north because walking south is all downhill.
The hiker began hiking the park's five-mile north hiking trail at 8:00 a.m. with plenty of daylight left to complete the hike before dark.
The boat traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes, giving the passengers several more hours to fish.
Answer The last one is you answer
Explanation:
The boat traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes, giving the passengers several more hours to fish. This statement is scientifically accurate description of velocity.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
The boat traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes. In this statement both magnitude and direction is given. From this statement, the velocity of the boat is:
= 200/5 meter/minute in north direction.
= 40 meter/minute in north direction.
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Radha was making coffee for her sister. She stopped stirring coffee but swirling motion continued for some time .She was wondering how this can happen .Can you help her in explaining in terms of inertia
Answer:
Explanation:
Inertia is one of the major properties of all objects which makes an object at rest to be reluctant to move and an object in motion to be reluctant to stop.
Therefore during the stirring of the coffee, the molecules of the mixture were in a continuous circular motion. But after the stirring has ceased, the molecules were reluctant to stop. Thus the motion continues for sometime until some available damping forces acts.
Thus the observation by Radha with respect to the motion of the coffee.
Ms. Mann's experiment illustrates several important facts in science
that include ALL BUT ONE of those listed here.
A)
Like charges repel.
B) Opposite charges repel.
C)
Friction can cause a transfer of charge.
D)
Attractive forces can work at a distance.
Answer:
(B)
Explanation:
I did it in USATestprep.
Ms. Mann's experiment illustrates several important facts in science that include all except for Opposite charges repel, as opposite charges attract. Thus, the correct option for this question is B.
What is a Scientific experiment?A scientific experiment may be characterized as a type of scientific test or investigation in which you have to perform a sequence of actions and carefully observe their consequences in order to derive some logical and unknowing facts.
According to the context of this question, like charges always repel one another, while opposite charges may definitely attract to each other. Friction can cause a transfer of charge from one object to another. Attractive forces can work at a distance.
Therefore, Ms. Mann's experiment illustrates several important facts in science that include all except for Opposite charges repel, as opposite charges attract. Thus, the correct option for this question is B.
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what is the kinetic energy of a 7.26 kg bowling ball that is rolling at a speed of 2m/s
Answer:
14.52 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 7.26 \times {2}^{2} \\ = 2 \times 7.26[/tex]
We have the final answer as
14.52 JHope this helps you
If a Ferrari, with an initial velocity of 14m/s, accelerates at a rate of 60 m/s^2 for 4 seconds, what will its final velocity be
Answer:
254 m/s
Explanation:
(Vf-Vi) = at
(Vf-14)= 60 (4)
Vf = 254 m/s