An acorn falls 10 meters in 4 seconds. What is its average velocity?
Answer:
Average velocity, V = 2.5m/s
Explanation:
Given the following data
Displacement = 10m
Time = 4secs
Average velocity can be defined as the rate of change in displacement with time. Velocity is a vector quantity and as such it has both magnitude and direction.
Mathematically, average velocity is given by the equation;
[tex]Velocity = \frac{displacement}{time}[/tex]
[tex]V = \frac{d}{t}[/tex]
Substituting into the above equation;
[tex]V = \frac{10}{4}[/tex]
Average velocity, V = 2.5m/s
Which characteristic is not a characteristic of plastic? A. Polymers are substances that have relatively large molecules. B. Oil and gas are the starting materials for making all polymers. C. Fabrics such as cotton and silk are synthetic polymers D. All polymers are obtained from living organisms
Answer: option C.
Fabrics such as cotton and silk are synthetic polymers
Explanation:
Fabrics such as cotton and silk are synthetic polymers because cotton and silk are natural polymers meaning they are gotten from natural source. Cotton is gotten from cotton plants and it is composed of cellulose which is a carbohydrates.
Silk also is gotten from animals I.efrom insect fibre or the cocoons of the larvae of the mulberry silkworm which is a polymer.
Can include a single word part on one side , with the meaning on the other side . Stephen can test himself or can enlist the help of someone else to hold them up to test him
Incomplete question; Full question read;
Type the correct answer in the box. Spell all words correctly. Stephen is a student who wants to test his knowledge of medical terminology. Which option could he use?
For medical terminology, ___________ can include a single word part on one side, with the meaning on the other side. Stephen can test himself or can enlist the help of someone else to hold them up to test him.
Answer:
Flashcard
Explanation:
It is interesting to note that a flashcard is an effective memory and teaching aid. It usually has a question on one side, and the other side contains the answer.
Hence, Stephen can build his knowledge of medical terminology by making use of a flashcard himself or can enlist the help of someone else to hold them up to test him.
Which of the following is not an example of work?
1.a man pushing a heavy box across the floor
2.an air hockey puck traveling at a constant speed
3.a magnet repelling a 4.compass needle
ship movement that causes ripples in the water
Answer:
3 a is the ans i think so ....
what is transformational energy?
It is the process of energy being converted into another type of energy.
Place the location of a watermelon in order from most to least potential energy.
aboard a flying airplane
2
on a roof
3
above a refrigerator
4
on the ground
5
on top of a table
it would be on the ground
A vector d has a magnitude of2.6 m and points north. What are the magnitudes and directions of the vectors (a) - d, (b) d/2.0, (c) - 2.5d, and (d) 5.0d?
Solution :
A vector is defined as an element that has magnitude of some measure and direction.
It is given there is vector 'd' which has magnitude 2.6 m and its direction is towards north.
a). -d
The magnitude of the vector '-d' is 2.6 m and its direction is reversed, i.e. its direction is towards south.
b). d/2.0
The magnitude of the vector 'd/2.0' is 1.3 m and its direction is towards north.
c). - 2.5d
The magnitude of the vector increases by 2.5 times i.e. 2.5 x 2.6 = 6.5 m and the direction is towards south.
d). 5.0d
The magnitude of the vector increases by 5 times i.e. 5 x 2.6 = 13 m and the direction is towards north.
please help! i need the answers asap!!! 10 points!!!!!
Answer:
Hydrogen and helium
Answer:
1. iron, nickel, calcium, sodium, and magnesium
2. nuclear fusion
Explanation:
I googled it
The diagram below shows four sound waves.
m А.
Wave 1
Wave 2
Wave 3
Wave 4
Which of these shows the waves in the increasing order of their frequencies? (3 points)
Оа
Wave 1, Wave 4, Wave 3, Wave 2
Oь
Wave 2, Wave 1, Wave 3, Wave 4
Ос
Wave 3, Wave 4, Wave 1, Wave 2
Od
Wave 4, Wave 3, Wave 1, Wave 2
Answer: D (Wave 4, Wave 3, Wave 1, Wave 2)
The arrangement of these waves in order of increasing frequency is;Wave 4, Wave 3, Wave 1, Wave 2.
What is a wave?A wave is a disturbance along a medium that transfers energy. We have to note that waves are shown in the manner that is depicted by the images shown in the question.
Now, the arrangement of these waves in order of increasing frequency is;Wave 4, Wave 3, Wave 1, Wave 2.
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In Alamogordo, New Mexico, falling rocks are a hazard along US Highway 82. If a rock falls from a cliff with 157 N of force,what was the mass of the rock?
Answer:
Mass, m = 16.02kg
Explanation:
Given the following data;
Force, F = 157N
Since it's a free fall, acceleration, a = g = 9.8m/s² (acceleration due to gravity).
To find the mass;
Force is given by the multiplication of mass and acceleration.
Mathematically, Force is;
[tex] F = ma[/tex]
Where;
F represents force measured in Newton.m represents the mass of an object measured in kilograms.a represents acceleration measured in meter per seconds square.Making mass (m) the subject of formula, we have;
[tex]Mass (m) = \frac{F}{a}[/tex]
Substituting into the equation;
[tex]Mass (m) = \frac{157}{9.8}[/tex]
Mass, m = 16.02kg
Therefore, the mass of the rock is 16.02kg.
what are some advantages of gravitational energy
Answer:
Explanation: Gravity keeps our bones and bodily muscles from not working, things like dams can be one example of gravitational energy being used for our benefits. Without gravitational energy, our earth most likely won't stay in it's own atmosphere. Another example is like a car on the top of the hill, or a snow pack (Where an avalanche might happen)
A ball is thrown into the air with a vertical velocity of 50 m/s and a horizontal
velocity of 40 m/s.
How long does it take for the ball to reach its highest point?
[tex]\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Projectile Motion.
Since, here given that, vertical velocity= 50m/s
we know that u*sin(theta) = vertical velocity
so the time taken to reach the maximum height or the time of Ascent is equal to
T = Usin(theta) ÷ g, here g = 9.8 m/s^2
so we get as,
T = 50/9.8
T = 5.10 seconds
thus the time taken to reach max height is 5.10 seconds.
Why is a rotated coordinate system used to solve an inclined plane problem?
A) Reduce the number of forces that need to be resolved into their x and y components.
B) To eliminate the need to consider the force of gravity.
C) To align the coordinate axes with the acceleration of the object on the plane.
D) To minimize the number of forces that need to be considered.
Answer:
Actually the answer is C, To align the coordinate axes with the acceleration of the object on the plane.
If you're not satisfied with your fitness evaluation score, there's really little you can do about it.
Answer:
False
Explanation:
Answer:
false
Explanation:
you can improve your score next time
Mr. and Mrs. miller both have blue eyes. Could any of their children be born with brown eyes? Circle yes or no. What tule or reasoning did you use to decide what the eye color of the children could be? Will give brainliest and a heart!
Answer:
yes
Explanation:
Generally, darker colors dominate so a person with one brown-eyed gene and one blue-eyed gene will have brown eyes. The only way to present blue eyes is to inherit two copies of the blue-eyed gene. However, brown-eyed parents can pass a recessive blue-eyed gene. Therefore, two brown-eyed partners can birth a blue-eyed baby.
The motion of a car on a position time graph is represented with a horizontal tine What does this indicate about the car's motion?
Answer:
Position-Time graphs display the motion of a object by showing the changes of velocity with respect to time.
The motion of a car on a position-time graph that is represented with a horizontal line indicates that the car has stopped moving.
A straight line with a positive slope indicates that the car is moving at a constant velocity, and thus the slope is constant. On the other hand, a curve with a changing slope, shows that the velocity is changing.
A trolley at rest is pushed to accelerate at a
uniform rate of 0.50 m/s2. What is its velocity after it
has traveled 4.0 m?
A. 0.13 m/s
B. 2.0 m/s
C. 3.5 m/s
D. 4.0 m/s
A car is traveling with a velocity of 5.5 m/s and has a mass of 1200 kg. What is the kinetic energy?!
Answer:
18150 JExplanation:
The kinetic energy of the car 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 1200 \times {5.5}^{2} \\ = 600 \times 30.25[/tex]
We have the final answer as
18150 JHope this helps you
Is this statement true or false?
A fertilized cell divides many times to form an embryo.
true
false
Is this statement true or false?
Human reproduction requires two reproductive cells from each parent.
true
false
Item 3
Is this statement true or false?
Growth is caused by cells in your body dividing and making new cells.
true
false
Is this statement true or false?
A cell nucleus contains DNA, which is a chemical code for all inherited traits.
true
false
A fertilized cell divides many times to form an embryo. - true
Human reproduction requires two reproductive cells from each parent. - true
Growth is caused by cells in your body dividing and making new cells. - false
A cell nucleus contains DNA, which is a chemical code for all inherited traits. - true
Answer:
true false true true
Explanation:
i took the quiz on keystone school and i didnt pass but i saw the end awnser
What is the elastic potential energy of a spring that is compressed a distance of 0.35 m and has a spring constant of 71.8 N/m?
Answer:
P.E = 4.398 Joules.
Explanation:
Given the following data;
Spring constant, k = 71.8N/m
Displacement, x = 0.35m
To find the elastic potential energy;
The elastic potential energy of an object is given by the formula;
[tex] P.E = \frac {1}{2}kx^{2}[/tex]
Substituting into the equation, we have;
[tex] P.E = \frac {1}{2}*71.8 *(0.35)^{2}[/tex]
[tex] P.E = 35.9 * 0.1225 [/tex]
Elastic potential energy = 4.398 Joules.
Therefore, the elastic potential energy of the spring is 4.398 Joules.
How could fluid friction be decressed
Answer:The fluid friction or drag can be reduced are minimised by giving special shape called streamlined shape to the objects which Move through fluids like air or water
Explanation:
plz mark brainlyest
What is the value of the initial horizontal velocity?
Answer:
9.8 m/s/s
Explanation:
The horizontal velocity of a projectile is constant (a never changing in value), There is a vertical acceleration caused by gravity; its valueis 9.8 m/s/s, down, The vertical velocity of a projectile changes by 9.8 m/s each second, Thehorizontal motion of a projectile is independent of its vertical motion.
Answer:
the horizontal component of the velocity, however, retains its initial value v0x=+115 m/s throughout the entire descent.
Explanation:
since the plane also travels at a constant horizontal velocity of +115 m/s, it remains directly above the falling package.
PLEASE ANSWER I DONT HAVE THAT MUCH TIME
Which industry requires the most water?
petroleum
paper
automobile
steel
Answer:
its paper
Explanation:
hope it helps
ace ur test !
Cual es la fuerza electrica sobre el electrón (-1.6 x 10¹⁹c) de un atomo de hidrógeno ejercida por el protón (1.6 x 10¹⁹c)? Supóngase que la distancia entre el electrón y el proton es de 5.3 x 10¹¹ m
Answer:
La fuerza eléctrica es -8.2*10⁻⁸ N
Explanation:
El enunciado correcto es: ¿Cuál es la fuerza eléctrica sobre el electrón (-1.6 x 10⁻¹⁹c) de un átomo de hidrógeno ejercida por el protón (1.6 x 10⁻¹⁹c)? Supóngase que la distancia entre el electrón y el protón es de 5.3 x 10⁻¹¹ m
Entre dos o más cargas aparece una fuerza denominada fuerza eléctrica. Su valor depende del valor de las cargas y de la distancia que las separa, mientras que su signo depende del signo de cada carga. Las cargas del mismo signo se repelen entre sí, mientras que las de distinto signo se atraen.
La fuerza eléctrica con la que se atraen o repelen dos cargas puntuales en reposo es directamente proporcional al producto de las mismas e inversamente proporcional al cuadrado de la distancia que las separa:
[tex]F=K*\frac{q1*q2}{d^{2} }[/tex]
donde:
F es la fuerza eléctrica de atracción o repulsión. En el Sistema Internacional (S.I.) se mide en Newtons (N). q1 y q2 son lo valores de las dos cargas puntuales. En el S.I. se miden en Culombios (C). d es el valor de la distancia que las separa. En el S.I. se mide en metros (m). K es una constante de proporcionalidad llamada constante de la ley de Coulomb. Depende del medio en el que se encuentren las cargas. Para el vacío K tiene un valor aproximadamente de 9*10⁹ [tex]\frac{N*m^{2} }{C^{2} }[/tex].En este caso:
F=?K= 9*10⁹ [tex]\frac{N*m^{2} }{C^{2} }[/tex]q1= -1.6*10⁻¹⁹ Cq2= 1.6*10⁻¹⁹ Cd= 5.3*10⁻¹¹ mReemplazando:
[tex]F=9*10^{9} \frac{N*m^{2} }{C^{2} }*\frac{(-1.6*10^{19} C)*(1.6*10^{19} C)}{(5.3*10^{-11} )^{2} }[/tex]
Resolviendo:
F= -8.2*10⁻⁸ N
La fuerza eléctrica es -8.2*10⁻⁸ N
What may also be called breakers? Crusher, Grappler, Hydraulic Hammer, Trencher
A 72 kg swimmer jumps into a pool from a diving board 3.25 m above the water. Use energy conservation to find his speed just as he hits the water if he jumps straight up (but just beyond the board!) at 2.5 m/s. A. 10.5 m/s B. 5.7 m/s C. 7.4 m/s D. 8.4 m/s
Answer:
8.06 m/s
Explanation:
It is given that,
Mass of a swimmer, m = 72 kg
He jumps from a diving board 3.25 m above the water.
We need to find the speed just as he hits the water if he jumps straight up. Using the conservation of energy to fin it as follows :
[tex]mgh=\dfrac{1}{2}mv^2\\\\v=\sqrt{2gh} \\\\v=\sqrt{2\times 10\times 3.25}\\\\ v=8.06\ m/s[/tex]
So, the required speed is 8.06 m/s.
If a wire lies within a magnetic field, what must be true for the magnetic field
to produce an electric current in the wire?
O A. The field must be produced by induced magnetism.
O B. The field must be produced by an electromagnet.
O C. The field must be moving.
D. The field must not be moving.
The wire that lies within a magnetic field must be true for the magnetic field to produce an electric current in the wire is, and the field must be moving. Hence, option C is correct.
What is magnetic Field?Magnetic forces can be seen in a magnetic field, an electric current, a changing electric field, or a vector field around a magnet. Compass blades and other ferromagnetic materials align in the path of magnetic fields like the one found on Earth.
Electrically charged particles are forced to move in a circular or helical pattern by magnetic fields. The operation of electric motors is caused by this force, which is applied to electrical impulses in wires in such a magnetic field.
Magnetization is stationary and is referred to as a magnetization field when it surrounds a magnetic core or a wire delivering a constant electric current in a single direction.
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Answer:
The field must be moving (C)
The psychologist who believed that behaviors that are followed by favorable consequences tend to be repeated was __________.
A.
James B. Watson
B.
B. F. Skinner
C.
Edward Thorndike
D.
Franz Mesmer
Answer:
the answer is B
Explanation:
The development of the theory of reinforcement by B. F. Skinner (Burrhus Frederick Skinner) and his behaviors support for its application to learning contributed to the emergence of the behaviorism and programmed instruction movements. Thus, option B is correct.
What psychologist believed that behaviors by favorable?Small instructional frames, self-pacing, active learner reaction to inserted questions, and fast feedback regarding behaviors the accuracy of a response are all characteristics of programmed instruction.
In essence, individualized education substitutes methodical or pre-programmed materials for the behaviors. Individualized teaching can be delivered by print, computer, or other medium as long as it is founded on the ideas mentioned above.
Therefore, The psychologist who believed that behaviors that are followed by favorable consequences tend to be repeated was B. F. Skinner.
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A jogger runs 5.0 km on a straight trail at an angle of 60° south of west. What is the southern component of the run rounded to the nearest tenth of a kilometer? -4.3 km -2.5 km 2.5 km 4.3 km
Given :
A jogger runs 5.0 km on a straight trail at an angle of 60° south of west.
To Find :
The southern component of the run rounded to the nearest tenth of a kilometre.
Solution :
We know, southern component is given by :
[tex]d = Dsin \ \theta\\\\d = 5\times sin \ 60^{\circ}\\\\d = -4.33\ km[/tex]
Here, negative sign indicates south direction.
Therefore, the southern component of the run rounded to the nearest tenth of a kilometre is 4.3 km.
Hence, this is the required solution.
The southern component of the run in nearest tenth is 4.3 km.
The given parameters:
Distance covered by the runner, d = 5 kmDisplacement, θ = 60⁰The southern component of the run is calculated by finding the equivalent vertical component of the distance covered by the runner as follows;
[tex]d_y = d \times sin(\theta)\\\\d_y = 5 \ km\times 60\\\\d_y = 4.3 \ km[/tex]
Thus, the southern component of the run in nearest tenth is 4.3 km.
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In which image below is the angle of refraction the greatest?
Answer:
Explanation:
Angle of refraction is the angle made by refracted ray with the normal at the point of incidence . In this figure , refracted ray has been shown by line having arrow-head . Normal has been shown by broken line .
We observe that in figure D , angle made by refracted ray with normal is greatest . So figure D is the answer.
The image where the angle of refraction is the greatest is the image D
What is the angle of refraction?The angle of refraction is the angle that the refracted ray made with the x-axis.
The higher the angle between the refracted ray and the x-axis, the higher the angle of refraction and vice versa.
From the given diagram, we can see that the image where the angle of refraction is the greatest is the image D
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