Answers
Answer:
b
Explanation:
Related Questions
A object moving at 20m/s slows uniformly at the rate of 30m/s² each second for a time of 4second determine A.its final velocity? B.its average velocity during the 4second? C.the distance moved in 6second
Answers
Answer:
a its final velocity
Explanation:
How is gravity involved in the formation of stars?
Group of answer choices
Causes a black dwarf to get dense enough for fusion to happen
Causes nuclear fusion, speeding up the atoms in the nebula
Causes nuclear fusion, slowing down the atoms in the nebula
Gravity causes a swirling nebula to contract into a ball
Answers
Gravity causes a black dwarf to get dense enough for fusion to happen.
How is gravity involved in the formation of stars?Gravity compresses the core of a protostar which leads to the increase in temperature. When the temperature is high enough that the star starts fusing hydrogen into helium. This fusion reaction is responsible for the formation of new stars.
So we can conclude that Gravity causes a black dwarf to get dense enough for fusion to happen.
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A 5.0 kg box is sitting on a scale in an elevator. Before the elevator moves, the scale reads 49.05 N. When the elevator accelerates into motion, the scale momentarily reads 46.75 N. If the acceleration due to gravity is 9.81 m/s2, what is the magnitude of the acceleration of the elevator? (1 point)
A) 0.46 m/s2
B) 0.57 m/s2
C) 0.87 m/s2
D) 0.91 m/s2
Answers
The magnitude of acceleration of the elevator is 0.46m/s². Details on how to calculate magnitude of acceleration can be found below.
How to calculate magnitude of acceleration?The magnitude of acceleration of the accelerator can be calculated by dividing the difference in force by the mass of the accelerator.
According to this question, a 5.0 kg box is sitting on a scale in an elevator. Before the elevator moves, the scale reads 49.05 N, however, when the elevator accelerates into motion, the scale momentarily reads 46.75 N.
Magnitude of acceleration = (49.05 - 46.75)/5
Magnitude of acceleration = 2.3/5
Magnitude of acceleration = 0.46m/s²
Therefore, the magnitude of acceleration of the elevator is 0.46m/s².
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in your own words, explain what friction is
Answers
Answer:
Friction is the resistance of motion when two objects rub against each other.
Explanation:
Hope this helps.
The groove wound around a screw is called a
Answers
Answer:
Thread
Explanation:
I made a powerpoint all about tools and things to use in woodwork.
A bicycle moves from rest to 8.0 m/s in 4.3 seconds. What was the acceleration?
Can please show me how you got it, I am so confused.
Answers
Answer:
1,86
Explanation:
V=V0+a x t
8 m/s=0 m/s + a x 4,3 s
8m/s=a x 4,3 s
a= 8m/s / 4,3 s
a=1,86
V=Last speed
V0=Initial speed
a=acceleration
t=time
Is the following chemical reaction balanced?
2H₂O2H₂O + 0₂
yes
no
Answers
Plot a graph showing the variation of stopping potential with the frequency of incident radiation for two different photosensitive materials having work Functions [tex]{\omega{1}}[/tex] and [tex]{\omega{2}}[/tex] [tex]{(\omega{1}>\omega{2})}[/tex]. On what factors does the (i) Slope and (ii) intercept of the lines depends?
Answers
We know By Einstein's Photoelectric Equation:
[tex]{:\implies \quad \sf h\nu =h\nu_{0}+\dfrac{1}{2}m{v^{2}}_{max}}[/tex]
[tex]{:\implies \quad \sf h\nu =h\nu_{0}+eV_{0}}[/tex]
[tex]{:\implies \quad \sf eV_{0}=h\nu -h\nu_{0}}[/tex]
[tex]{:\implies \quad \sf V_{0}=\dfrac{h\nu}{e}-\dfrac{h\nu_{0}}{e}}[/tex]
Since [tex]{\nu}[/tex] is plotted along X-axis and [tex]{V_0}[/tex] along Y-axis, it represents a straight line
(i) The slope of [tex]{V_{0}}[/tex] versus [tex]{\nu}[/tex] graph= (h/e) i.e it is a constant quantity and does not depend on the nature of the metal surface
(ii) The intercept on the [tex]{\nu}[/tex]-axis = [tex]{(h\nu_{0}/e)}[/tex] i.e it depends on the work function of the metal surface
Refer to the attachment for the graph
Einstein published three major scientific papers. One of these put forward a new way of calculating the size of molecules. Another explained Brownian motion — the random dance performed by specks of dust trapped in a fluid. Einstein suggested that the tiny particles making up the fluid — its atoms or molecules — were bouncing against the specks of dust and causing the motion. These papers helped to establish the reality of atoms and molecules. Another of Einstein’s 1905 papers explained the photoelectric effect — the way that metals could emit electrons (tiny charged particles) from their surface when light was shone on them. Most scientists believed that light travelled in waves — like sound or water waves. But Einstein suggested that the photoelectric effect could be explained if light could also behave as a stream of tiny packets of energy.
(2) Einstein’s paper on the photoelectric effect helped give birth to quantum theory, and it was for this paper that Einstein received the Nobel Prize in 1922. Quantum theory led, in the 1920s and 1930s, to another revolution in physics. Physicists showed that, as well as light waves behaving like particles, particles could sometimes act as waves. This theory established “objective probability” in physics. This was the idea that completely unpredictable chance events can take place at the subatomic level. Einstein never fully accepted the prevalent interpretation of quantum theory. But, while many of these interpretations involve wild metaphysical flights of fancy, the physical results are, like those of relativity, very well established.
(3) Marrying together the two pillars of 20th century physics — relativity and quantum theory — is a central problem for physics even today. Successfully doing this may require a revolution in science similar to those begun by Newton and Einstein. There are three main interconnected driving forces for such changes in science. The first is the development of technology. Changes in technology can make new experiments possible and they also influence the problems that scientists develop an interest in. Newton was fascinated by the new machines of the 17th century. Similarly, Einstein was fascinated by electricity and magnetism. This influence also works in a negative way. The governments and multinationals that control technology are often able to dictate what is researched.
(4) The second factor driving scientific progress is the way that the dominant ideas in society change. Ideas from the broader culture can impinge upon science. Newton’s ideas were part of a revolutionary new attempt at a rational explanation of both nature and society. On the other hand, the dominant ideas in society can also limit the development of science. This is most obvious in the social sciences, where delving too deeply into how society is organized might raise difficult questions for our rulers. Less is at stake in the natural sciences. Indeed, improvements in natural sciences are vital to our rulers if they want to compete effectively with each other. But the distorted worldview of capitalism still impacts on science. Extremely narrow and specialized bodies of knowledge develop—creating problems for scientists trying to bring about the kind of sweeping revolution heralded by Einstein.
(5) Finally, science moves forward because scientists seek to develop logically consistent theories. This can push them beyond the dominant or common sense ideas of their time. Einstein’s breakthrough cannot be reduced simply to changes in technology or wider cultural and ideological shifts. Science is not simply the gathering and ordering of data about the outside world. It also requires abstraction—developing theories about the underlying laws of nature that are usually not immediately apparent. This crucial role of theory is not just a feature of the natural sciences.
(6) Einstein argued that “common sense is the prejudices acquired by age 18”. Marxist theory, which is a social science topic, challenges “common sense” political ideas. If we, according to this theory, want to change the world, we need to combine our actions with theory that digs below the surface appearance of society to understand how the system works.
What is the main issue being discussed?
Answers
The main issue that is being discussed in the manuscript is the development of science.
What factors affect development of science?Capitalism impacts on science because extremely narrow and specialized bodies of knowledge creating problems for scientists to bring revolution. The dominant ideas in the society can also limit the development of science.
So we can conclude that the main issue that is being discussed in the manuscript is the development of science.
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A sports car can move 100.0 m in the first 3.8 s of constant acceleration. What is the car's acceleration?
m/s²
Answers
Answer:
6.9m/s^2
Explanation:
100m/3.8=26.3m/s^2
06.** A block takes twice as long to slide down an inclined plane that makes an angle of 35 with the horizontal as it does to fall freely through the same vertical distance h. What is the coefficient of kinetic friction? [μ = 0.16]
Answers
The coefficient of kinetic friction between the block and the incline is 0.168.
Coefficient of kinetic frictionThe coefficient of kinetic friction is determined from the principle of conservation of energy as follows;
distance traveled on the incline = L
L = h/sin35
L = 1.743 h
Since it takes twice the time travel down,
velocity to slide = 1.743 h/2t = 0.871 v
v is the velocity to drop from the vertical heightK.E of the block when it slides = ¹/₂mv₁² = ¹/₂m(0.871v)² = 0.871²(K.E to fall) = 0.758K.E to fall straight down
Energy lost to friction1 - 0.758 = 0.24
Conservation of energyμmgcos(35) = 0.24(mgsin(35)
μcos(35) = 0.24(sin(35)
μ = 0.168
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______ interference occurs when two waves are out of phase.
Answers
Answer:
What interference occurs when two waves are out of phase?
Image result for ______ interference occurs when two waves are out of phase.
Destructive interference
Destructive interference occurs when the maxima of two waves are 180 degrees out of phase: a positive displacement of one wave is canceled exactly by a negative displacement of the other wave. The amplitude of the resulting wave is zero.
2 kq kg of ice at -4 degress Celsius is heated at Water at room temperature of 25 degrees Celsius .how much heat is absorbed
Answers
Answer:
893.8 [kJ].
Explanation:
1) the total heat can be calculated as
E=Q₁+Q₂+Q₃, where Q₁ - energy to heat the ice from -4 to 0; Q₂ - energy to melt the ice; Q₃ - to heat the water at 0 °C to 25 °C;
2) Q₁=λ*m*Δt₁, ⇒ Q₁=2100*2*4=16800 [J];
3) Q₂=c₂*m; ⇒ Q₂=333500*2=667000 [J];
3) Q₃=c₃*m*Δt₂; ⇒ Q₃=4200*2*25=210000 [j];
4) finally, the required heat is
E=16800+667000+210000=893800 [J]=893.8 [kJ].
Calculate the current through the ammeter (look at photo)
Answers
Answer:
6 amps
Explanation:by Kirchhoff's loop rule the current at any point in the loop must be equal or charge would be building up. The current at the ammeter is equally to the total current through the sun of the paths in parallel which it is in series with
An elevator is moving upward with a speed of 9.2 m/s. 3.8 seconds later, the elevator is still moving upward, but its speed has increased to 15.8 m/s. What is the average acceleration, in m/s2, of the elevator during the 3.8-s interval? Please round your answer to one decimal place.
Answers
From the calculations, the acceleration of the elevator is obtained as 1.5m/s^2
What is acceleration?The term acceleration has to do with the rate of change of velocity with time.
Given that;
u = 9.2 m/s
v = 15.8 m/s
t = 3.8
a = ?
The v = u + at
a = v - u/t
a = 15 - 9.2/3.8
a = 1.5m/s^2
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A transformer has 120 turns on the primary coil and 70 turns on the secondary coil. If the output voltage is 220V, what is the input voltage?
Answers
answer : input voltage = 377.143
steps:
Vout/Vin = Ns/Np
p = primary
s = secondary
primary and secondary voltages
are the same as
induced EMF
V is voltage
N is number of turns
output voltage / input voltage = secondary turns / primary turns
220/input voltage = 70 / 120
input voltage * 70 = 220 * 120
input voltage = (220 * 120)/70
input voltage = 377.143
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Socratic
quizlet
Tom is sitting facing forward in the train as it is getting ready to leave the station. He puts a smooth ball on the train floor. The train jolts into motion, accelerating rapidly up to speed. According to Newton's first law of motion, what happens to the ball? (1 point)
A) Nothing changes.
B) The ball rolls forward slowly.
C) The ball rolls forward rapidly.
D) The ball rolls backward.
Answers
According to Newton's first law of motion, what happens to the ball is the ball rolls backward.
What is the first law?This means that an object at rest or in motion will remain uniformly rectilinear and tend to be in that state if the net force on it is zero.
In this case, we have to think that the ball is at rest and the train is moving with a velocity that way, the reaction of the ball will be to go in the opposite direction to the motion.
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8. How do you think that might be the reason why the Sun warms more in the summer? To give your explanation can rely on the angle of the sunlight falling in the months: January, March and June.
Answers
Answer:
Because the angle of the sun moves/rotates in the summer, the sun's rays move their angle and impact the earth.
A duck has a mass of 2.70 kg. As the duck paddles, a force of 0.110 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.220 N in a direction of 47.0° south of east. When these forces begin to act, the velocity of the duck is 0.120 m/s in a direction due east. Find (a) the magnitude and (b) the direction (relative to due east) of the displacement that the duck undergoes in 2.70 s while the forces are acting. (Note that the angle will be negative in the south of east direction.)
Answers
a) The magnitude will be 0.838m
b) The displacement will be -17.35°
What is displacement?The path covered by an object from its initial point to final point.
Forces acting on the duck
x-axis: 0.13 + 0.16*cos(-56°) = 2.7 * ax
ax = 0.0813 m/s^2
y-axis: 0.13*sin(-56°) = 2.7 * ay
ay = -0.0491 m/s^2
The displacement on the x-axis
X = Vox * t + ax/2 * t²
X = 0.12* 3.2 + 0.0813/2*3.2²
X = 0.8
The displacement on the y-axis:
Y = Voy * t + ay/2 * t²
X = 0 - 0.0491/2*3.2²
Y=-0.25m
So, the magnitude and angle of this displacement [0.8,-0.25] is:
0.838m at an angle of -17.35°
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On your vacation, you take a plane from Atlanta to San Francisco (3400 km). The flight takes 4.0 hours. The first ten minutes and the last ten minutes are spent speeding up and slowing down respectively. Therefore, you reach your top speed 10 minutes into the flight. What was your average speed on this flight?
Answers
Answer: S = 850 km/h = 235.11 m/s
Explanation:
average speed = total distance : total time elapsed
distance = 3400 km
total time = 4 hours
average speed = D : T = 3400 km : 4 h = 850 km/h
[ 850 km /h = 850 000 m : 3600 s = 236.11 m/s ]
which two forces operate over only very SHORT distances?
A. weak nuclear and gravitational
B. strong nuclear and gravitational
C. weak nuclear and electromagnetic
D. strong nuclear and weak nuclear
Answers
Strong nuclear and weak nuclear forces act only over short range distances.
What are forces?Forces are agents which bring about a change in the state or motion of an object.
Forces can be described as pull or push agents.
Forces can either be contact or non-contact forces.
Some non-contact forces are gravitational forces and nuclear forces.
Nuclear forces act only over short range distances. Example are the strong and weak nuclear forces.
Therefore, strong nuclear and weak nuclear forces act only over short range distances.
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The reason uranium mining is dangerous is that chain reactions occur naturally in uranium ore deposits
O True
O False
Answers
Answer:
False po cguro yung sagot d ko po kac Alam e Kaya I Wil study hard to get the correct answer and I will share to you pero I try to be a good friend of mine and I will be a great help to you and your family and your family and friends with you and your family and friends and family and friends with you and your family and friends and family and friends with you and your family and friends and family and friends with you and your family and friends and family and friends with you and your family and friends and family and friends with you and your family and friends and family and friends with you and your family and friends and family and friends with you and your family and and I hope I hope you you will be will be able to come to the next event in the future and hope to see you see you soon and hope you have a great day and I will see you see you soon and and will see you soon and hope you have a great day and I will see you soon and hope you have a great day and I will see you soon and hope you have a great day and I will see you soon and hope you have a great day and I will see you soon and hope you have a great day and I will see you soon and hope you have a great day and I will see you soon soon and and thank you for your thank you
Purpose: Determine the kinetic energy of a constant velocity car when it is switched on.
A. Design an experimental procedure to find the kinetic energy of a constant velocity car. Make a list of the equipment you would use.
B. Describe the overall procedure you would follow. Provide enough detail so another student could replicate the experiment, including any steps necessary to reduce experimental uncertainty.
C. Clearly list what data you need to collect.
D. List what equations you need to use with the data you collected to find the kinetic energy of the car.
E. Describe the energy conversion that occurs while the constant velocity car is running. What other types of energy does the car have, aside from kinetic energy?
F. If you were to actually complete this lab, what are some potential sources of error that could cause your answer to be incorrect?
Answers
Answer:
The kinetic energy is proportional to the square of the speed, so doubling the speed increases the kinetic energy by a factor of 4.
Discuss how wind energy was used in ancient times.
Answers
Answer:
People used wind energy to propel boats along the Nile River as early as 5,000 BC. By 200 BC, simple wind-powered water pumps were used in China, and windmills with woven-reed blades were grinding grain in Persia and the Middle East.
Explanation:
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A car starts from rest and reaches a velocity of 50.0 m/s in 41.0 seconds. What is the
acceleration
Please show how you got it
Answers
Answer:
1.21 or 1.2 acceleration
Explanation:
i think it is 50.0/41.0
which would equal 1.21(depending on if you round it)
Which diagram shows the resulting wave when they cross at point X?
A straight line.
A triangular crest.
A rectangular crest.
A triangular trough.
Answers
The resulting wave will have zero amplitude, thus it will form a straight line.
What is a crest?A crest is an upward displacement of a progressive wave.
What is a trough?A trough is a downward displacement of a progressive wave.
Superimposition of the two wavesWhen the two waves meet each other at point X, they will superimpose and cancel out since they have equal amplitude and are in opposite direction.
The resulting wave will have zero amplitude, thus it will form a straight line.
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If a box with a mass of 8.0 kg is sitting on a frictionless surface and experiences an acceleration of 4.0 m/s2 to the right, what is the net force acting on the box? (1 point)
A) 2.0 N
B) 12 N
C) 32 N
D) 45 N
Answers
The net force acting on a box of mass 8.0kg that experiences an acceleration of 4.0m/s² is 32N. Details about net force can be found below.
How to calculate net force?The net force of a body can be calculated by multiplying the mass of the body by its acceleration as follows:
Force = mass × acceleration
According to this question, a box with a mass of 8.0 kg is sitting on a frictionless surface and experiences an acceleration of 4.0 m/s2 to the right.
Net force = 8kg × 4m/s²
Net force = 32N
Therefore, the net force acting on a box of mass 8.0kg that experiences an acceleration of 4.0m/s² is 32N.
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Answer: 32N
Explanation: Force= Mass*Acceleration
Force=8*4= 32N
Which shows the correct order of processes leading up to the formation of a main sequence star?
(A Gases condense to form a nebula, gravity causes the nebula to collapse and spin, nuclear fusion occurs, and a protostar forms.
(B A protostar forms, nuclear fusion occurs, gases condense to form a nebula, and gravity causes the nebula to collapse and spin.
(C Gases condense to form a nebula, gravity causes the nebula to collapse and spin, a protostar forms, and nuclear fusion occurs.
(D A protostar forms, gases condense to form a nebula, gravity causes the nebula to collapse and spin, and nuclear fusion occurs.
Answers
The correct order of processes leading up to the formation of a main sequence star is : ( C ) Gases condense to form a nebula, gravity causes the nebula to collapse and spin, a protostar forms, and nuclear fusion occurs.
What is a main sequence star ?A main sequence star is a group of stars which forms a band of stellar types usually 90 percent when plotted on a graph ( spectrum vs luminosity) it also represents the life stages of a regular star in the galaxy.
In conclusion the correct order of the main sequence star is; Gases condense to form a nebula, gravity causes the nebula to collapse and spin, a protostar forms, and nuclear fusion occurs.
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What do Base Isolators act like on
earthquake resistant buildings?
A. suspension cables
B. rotating pistons
C. levers
D. shock absorbers
Answers
Suspension cables
Suppose an astronaut has landed on Planet * Fully equipped, the astronaut has a
mass of 120 kg and when the astronaut gets on a scale, the reading is 46 N. what is
the acceleration due to gravity on Planet X. (Answer to 2 decimal places) you
Answers
From the calculations, the value of the acceleration due to gravity is 0.38 m/s^2.
What is weight?The weight of an object is obtained as the product of the mass of the body and the acceleration due to gravity.
Thus;
When;
mass = 120 kg
weight = 46 N
acceleration due to gravity = 46 N/120 kg
=0.38 m/s^2
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