Explanation:
Using Equations of Motion :
[tex] {v}^{2} = {u}^{2} + 2as[/tex]
[tex]a = \frac{{v}^{2} - {u}^{2}}{2s} = \frac{400 - 0}{70} = 5.71msec^{ - 2} [/tex]
How can the force of friction between two surfaces be reduced?
a. By changing rolling friction to sliding friction.
b. By making smooth surfaces rougher.
c. By separating surfaces with a lubricant.
d By increasing the force between the surfaces.
The modern periodic table of elements contains
_______ main groups.
Answer:
The modern periodic table of elements contains
Eighteen main groups.
Determine the vector sum of the displacements Δd1 = 2.4 m [32° S of W]; Δd2 = 1.6 m [S]; and Δd3 = 4.9 m [27° S of E].
Answer:
3.44 metres
Explanation:
To determine the vector sum of the displacements Δd1 = 2.4 m [32° S of W]; Δd2 = 1.6 m [S]; and Δd3 = 4.9 m [27° S of E], resolve the given parameters into x - component and y - component.
Resolving into x - component
- 2.4cos32 + 4.9cos27 = 2.3306
Resolving into y - component
- 2.4sin32 - 4.9sin27 - 1.6 = - 2.553
The vector sum of the displacement will be
Sqrt( 2.3^2 + 2.6^2) =
Sqrt ( 11.81)
3.44 m
Therefore, the vector sum of the displacements is 3.44 metres
PLEASE HELP!!!
A group of friends are doing some archery.
When Brian fully stretches the bow, it stores 10 J of energy.
Describe the energy transfer that occurs as Brian stretches the bow.
[2 marks]
Answer: potential to kinetic/mechanical
Explanation:
When Brian fully stretches the bow, it stores 10 J of energy. The energy transfer that occurs as Brian stretches the bow will be from the potential energy to the kinetic energy.
What is the law of conservation of energy?According to the Law of Conservation of Energy, energy can neither be created nor destroyed, but it can be transferred from one form to another.
The total energy is the sum of all the energies present in the system. The potential energy in a system is due to its position in the system.
In the above problem, the potential energy gets converted into kinetic energy at the expense of the loss of gravitational potential energy between the two positions.
Friends are practicing archery together. The bow holds 10 J of energy when Brian stretches it to its maximum length. As Brian extends the bow, energy will go from the potential energy to the kinetic energy.
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what are forces that two objects apply on each other
A truck covered 2/7 of a journey at an average speed of 40
mph. Then, it covered the remaining 200 miles at another
average speed. If the average for the whole journey was 35
mph, what was the amount of time for the whole journey?
h
Answer:8h
Explanation:
Answer: 8 h
Explanation:
I got it right
A toy car has an initial velocity of 5 m/s and experiences a constant acceleration of 2.0 m/s2. How far does the toy car travel before reaching a velocity of 11 m/s? Write your answer to one decimal place.
Answer:t would be 17 m/s
If we use V2 = V1 + a*t
Sub in 5 for v1
2m/s*2 for a
And
6 for t
That should give you the answer.
If a bullet with an acceleration of 1.5 m/s2 takes 2 seconds to leave the muzzle of a rifle (starts at rest), what was the length of the rifles barrel?
Answer:
The length is [tex]D =3 \ m [/tex]
Explanation:
The velocity of the bullet is mathematically evaluated as
[tex]v = a * t [/tex]
=> [tex]v = 1.5 * 2 [/tex]
=> [tex]v = 3 \ m/s [/tex]
Now from kinematic equation
[tex]v^2 = u^2 + 2* a * D[/tex]
Here D is the length of the barrel and u = 0 m/s
So
[tex]3^2 = 0 + 2* 1.5 * D[/tex]
[tex]D = \frac{9}{3} [/tex]
[tex]D =3 \ m [/tex]
a woman drops a rock from a bridge to the water 17.5 m below. with what speed does the rock strike the water?
a. 0 m/s
b. 18.5 m/s
c. 171m/s
d. 9.8 m/s
e. 17.5 m/s
Given :
Height from which rock is dropped, h = 17.5 m.
Initial velocity, u = 0 m/s.
To Find :
Speed does the rock strike the water.
Solution :
We know, by equation of motion :
[tex]v^2-u^2=2as[/tex] ......( 1 )
Here , a = g = 9.8 m/s² ( Acceleration due to gravity )
Putting all given values in 1 , we get :
[tex]v^2-u^2=2as\\\\v=\sqrt{2gh}\\\\v=\sqrt{2\times 9.8\times 17.5}\ m/s\\\\v=18.5\ m/s[/tex]
Therefore, speed with rock strike the water is 18.5 m/s.
Hence, this is the required solution.
Plz help me. I need urgent Why a magnetic compass is used to determine direction? Why a nail gets magnetized when kept close to magnet? Why two pins get attracted by bar magnet maintain distance between ends?
Answer:
Compasses are mainly used in navigation to find direction on the earth. This works because the Earth itself has a magnetic field which is similar to that of a bar magnet. The compass needle aligns with the Earth's magnetic field direction and points north-south. Also, In a magnet all the domains are oriented in the same direction. In the case of a nail, the domains can be aligned in the same direction causing the nail to become magnetic. That is because if you hang a bar magnet from a thread, the north pole will point to magnetic north. When you bring one north pole close to another north pole they repel each other. You can feel the two magnets pushing each other apart.
Convert 10,000 inches to miles.
Does the distance a person kicks a soccer ball
affect how well they will do on their math test?
Identify the independent and dependent
variable
Answer:
Independent variable: how far the soccer ball is kicked.
Dependent variable: how well the person does on their math test
Explanation:
The distance the ball is kicked is what the scientist can change. On the other hand, in this experiment, how well the person does on their test supposedly relies on how far the soccer ball is kicked.
A monorail starts from rest and accelerates at a rate of 2.2m/s2 for 10s.Then it runs at a constant speed for 74s and then slows down at a rate of 1.5m/s2
Answer:
d = 4217 m
Explanation:
Case 1.
Initial velocity, u = 0
Acceleration, a = 2.2 m/s²
Let d₁ is the distance in case 1. Using second equation of motion as follows :
[tex]d_1=ut+\dfrac{1}{2}a_1t_1^2\\\\\text{Here, u =0}\\\\d_1=\dfrac{1}{2}\times 2.2\times 10^2\\\\d_1=110\ m[/tex]
Let d₂ in the distance in case 2. Using second equation of motion as follows :
[tex]d_2=ut+\dfrac{1}{2}a_2t_2^2\\\\\text{Here, u =0}\\\\d_2=\dfrac{1}{2}\times 1.5\times 74^2\\\\d_2=4107\ m[/tex]
Total distance,
D = d₁ + d₂
D = 110 + 4107
D = 4217 m
Hence, the total distance covered is 4217 m.
how long a boy will take to run round a square field of side ,35 if he run at the rate of 9km/hr
Answer: it will take 15 minutes
Answer:
It will take the boy 136 hours 11 minutes.
Explanation:
35 × 35 = 1225km is the area of the square.
Now find how long it will take the boy:
1225 ÷ 9 = 136.11
Which is 136 hours 11 minutes.
Explain why there is a delay between the arrival of the sound transmitted through the steel pipe and the sound transmitted by the air in the pipe.
Answer: RATE ME AND MAKE ME BRAININESS AND THANK ME
Explanation:Sound waves are pressure waves that travel through Earth's crust, water bodies, and atmosphere. Natural sound frequencies specify the frequency attributes of sound waves that will efficiently induce vibration in a body (e.g., the tympanic membrane of the ear) or that naturally result from the vibration of that body.
Sound waves can potentiate or cancel in accord with the principle of superposition and whether they are in phase or out of phase with each other. Waves of all forms can undergo constructive or destructive interference. Sound waves also exhibit Doppler shifts—an apparent change in frequency due to relative motion between the source of sound emission and the receiving point. When sound waves move toward an observer the Doppler effect shifts observed frequencies higher. When sound waves move away from an observer the Doppler effect shifted observed frequencies lower. The Doppler effect is commonly and easily observed in the passage of planes, trains, and automobiles.
The speed of propagation of a sound wave is dependent upon the density of the medium of transmission. Weather conditions (e.g., temperature , pressure, humidity , etc.) and certain geophysical and topographical features (e.g., mountains or hills) can obstruct sound transmission. The alteration of sound waves by commonly encountered meteorological conditions is generally negligible except when the sound waves propagate over long distances or emanate from a high frequency source. In the extreme cases, atmospheric conditions can bend or alter sound wave transmission.
The speed of sound in steel is about 17 times as fast as it's speed in air.
Naturally, when a sound starts out at one end of a pipe, it reaches the other end thru the steel before it reaches the other end thru the air in the pipe.
The longer the pipe is, the longer will be the delay between the arrival of the two sounds at the other end.
Jennifer works for an automaker and tests the safety performance of cars. She watches a 2,000-kilogram car crash into a wall with a force of 30,000 newtons. What’s the acceleration of the car at impact? Use F = ma.
The answer is a = 15 m • s - 2.
Answer:
A
Explanation:
Can some one help please i’m in danger !
Distance = Speed × Time
Answer:Level 1:The distance travelled during 5 hours = 0 × 5 = 0 km
Level 2:The distance travelled during 5 hours = 50 × 5 = 250 km
Level 3:The distance travelled during 5 hours = 60 × 5 = 300 km
Level 4:The distance travelled during 5 hours = 60 × 4 = 240 km
Joelle is a manager at a construction company, and she is interested in the chemistry behind
the materials they use. She has begun studying the materials used to fill walls. She knows
that to keep the temperature inside a room steady the material must be a thermal insulator,
and she predicts that materials should not be acidic or else they would dissolve too easily in
water
Answer: C6H6
Explanation:
I did it and got it right
Answer:
Yes the answer is C6H6
Explanation:
I just took the test
A country is experiencing economic problems. Many people are unemployed,
and businesses have been making risky investments. The government
decides to start more programs to help poor citizens find jobs, and to regulate
corporate behavior.
This situation best reflects the influence of which economic thinker?
This situation best reflects the influence of which economic thinker is John Maynard Keynes
The following information should be considered:
Keynes's theory was increased in the government expenditures and lower the taxes that stimulated demand.Also, it should pull the economy out of a depression.Learn more: https://brainly.com/question/5763151?referrer=searchResults
Pictured is an animal cell and a plant cell. Which organelle labeled in the plant cell produces the energy for the cell?
Answer:
Mitochondria
Mitochondria. Mitochondria are double membrane-bound cell organelles responsible for the supply and storage of energy for the cell.
Explanation:
The organelle labeled as "mitochondria" in the plant cell produces the energy for the cell through the process of cellular respiration.
What are mitochondria?Mitochondria are organelles found in most eukaryotic cells. They are often referred to as the "powerhouses" of the cell because their main function is to produce energy in the form of ATP (adenosine triphosphate) through a process called cellular respiration.
Mitochondria have an outer membrane and an inner membrane with folds called cristae. The space between the two membranes is called the intermembrane space, while the space inside the inner membrane is called the mitochondrial matrix. The mitochondrial matrix contains enzymes and other molecules needed for the metabolic reactions of cellular respiration.
Cellular respiration is a process that converts glucose and oxygen into ATP, which is the primary energy source for cells. Mitochondria play a key role in this process by breaking down glucose through a series of chemical reactions that ultimately produce ATP. The energy stored in ATP molecules can then be used by the cell for various cellular processes, such as muscle contraction, protein synthesis, and the maintenance of the cell's membrane potential.
In addition to their role in ATP production, mitochondria are also involved in other important cellular functions, such as calcium signaling, apoptosis (programmed cell death), and the synthesis of certain lipids and heme groups. Mitochondrial dysfunction has been implicated in a number of diseases, including Parkinson's disease, Alzheimer's disease, and diabetes.
Therefore, Through the process of cellular respiration, the organelle in the plant cell known as the "mitochondria" generates the energy for the cell.
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which element is loacted in group 17 period 6
Density is a chemical property of matter.
TRUE
FALSE
Answer:
False
Explanation:
Density is a physical property of matter.
Answer:
False
Explanation:
Density is NOT a chemical property, it is a physical property.
A microwave has a _________ wavelength and a ________ frequency than a radio wave
Answer:
A microwave has a shorter wavelength and a higher frequency than a radio wave.
Explanation:
On the electromagnetic spectrum, radio waves have the absolute lowest frequency, as well as the longest wavelength; therefore, any wave on the electromagnetic spectrum would have a shorter wavelength and higher frequency than a radio wave.
Describe current in terms of charge and electrons.
PLEASE HELP I WILL GIVE BRAINLIEST
hey can anyone help me out in dis pls
Answer:
All of the above
Explanation:
Solids have a fixed shape and volume.
Even though the molecules in a solid are vibrating, they can't travel from one part of the solid to the other.
I hope this helps! :)
A compound is formed when a sulfur atom and six fluorine atoms share electrons. What is the name of the compound? A. sulfur (I) fluoride B. sulfurous fluoride C. sulfuric heptafluoride D. sulfur hexafluoride
Answer:
D. Sulfur hexafluoride.
Explanation:
The electric motor of a model train accelerates the train from rest to 0.620 m/s in 21ms. The total mass of the train is 825 g. find the average power delivered to the train during its acceleration.
Explanation:
Average power = change in energy / change in time
P = ΔE / Δt
P = (½ mv²) / t
P = (½ (0.825 kg) (0.620 m/s)²) / (0.021 s)
P = 7.55 Watts
Which economic idea did Adam Smith promote in The Wealth of Nations?
The economic idea that Adam Smith promoted in The Wealth of Nations was that without government interference, businesses should be able to function freely. This is further explained below.
What is the economic idea that Adam Smith?Generally, Smith was an opponent of free trade. open markets tend to self-regulate via competition, market forces, and self-interest.
In conclusion, In Adam Smith's The Wealth of Nations, argued that enterprises should be freed to operate without government intervention.
Read more about the economy
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Answer:bA country’s wealth should be measured based on its productivity.
Explanation:
Academic integrity only relates to a. Online learning c. Instances of cheating b. All subjects d. Any academic situation I give brainliness
Answer:
answer is d.
Explanation:
are you going to mark me brainlinessist
A 0,34-kg volleyball is flying west at 1,98 m/s when it strikes a stationary 0,60-kg basketball dead centre. The volleyball rebounds east at 0,79 m/s. What will be the velocity of the basketball immediately after impact? Choose the east direction as positive.
Explanation:
use the law of conservation of momentum
M1U1+M2U2=M1V1+M2V2
m-mass
u-initial velocity
v-final velocity
1-volleyball
2-basket ball dead center
so using the above formula
0.34×1.98+0.64×0=0.34×0.79+0.64×V2
to get
0.6732+0 = 0.2686+0.64V2
0.4046=0.64V2
divide both sides by 0.64 to get V2 which is the final velocity of basketball
0.6322m/s=V2
The final velocity of the basketball after the impact is 1.643 m/s west.
The given parameters;
mass of the volleyball, m = 0.34 kginitial velocity of the volleyball, u₁ = 1.98 m/smass of the stationary basketball, m₂ = 0.6 kgfinal velocity of the volleyball, v₁ = 0.79 m/sThe final velocity of the basketball after the impact is calculated by applying the principle of conservation of linear momentum;
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
0.34(-1.98) + 0.6(0) = 0.79(0.34) + 0.6(v₂)
-0.673 = 0.316 + 0.6v₂
-0.989 = 0.6v₂
[tex]v_2 = \frac{- 0.989}{0.6} \\\\v_2 = -1.643 \ m/s\\\\v_2 = 1.643 \ m/s \ west[/tex]
Thus, the final velocity of the basketball after the impact is 1.643 m/s west.
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