Answer: Please find the answer in the explanation
Explanation: According to the Newton 3rd law of motion which state that;
In every action, there will be equal and opposite reaction.
when the piston of a fountain pen with a nib is dipped into ink and and the air is released by pressing it, a force is applied which act on the molecules of the ink by pushing the molecules. When the force is released, there will be a reaction force by pulling the molecules of the ink into the pen. Thereby the ink fills in the pen.
What is the number at the end of an isotope’s name? atomic number neutron number mass number electron number
Answer:
C) mass number
Explanation:
I got it correct on edge
Answer: c
Explanation:
A student is conducting an experiment to determine how far a ballwill roll down a ramp based on the angle of incline what are the three possible controls for the experiment
Answer:ball, ramp, and angle
Explanation: these are the three things that are controls because you can control them
calculate the electric field acting on a proton so that proton remains stationary in a space a)2.04*10^-2 b)1.02*10^-7
Answer:
No electric field will exist.
Explanation:
Given the following:
In other to for the proton to remain stationary in space, the electric field acting on the proton will be 0 or no electric field will exist. From the formulae ;
F = qE ; where q = charge of the particle
E = electric field intensity
The electric field force = F
At a stationary position in space, the electric field intensity = 0
F = qE = q * 0 = 0.
Also according to Heisinberg, measuring the momentum and position of a quantum object becomes more and more uncertain when measured simultaneously.
Here, one of position or momentum is know, measuring the electric field becomes very uncertain.
You are in an elevator that is accelerating you upward at 4.55 m/s^2. How much time does it take you to reach a speed of 11.0 m/s?
Answer:
t = 2.01 seconds
Explanation:
It is given that,
The acceleration of the elevator is 4.55 m/s².
We need to find time taken by you to reach a speed of 11 m/s
The initial velocity of the person is equal to 0 (at rest). Let t is the time.
Using equation of kinematics as follows :
v = u +at
Acceleration = g-a and u = 0
So,
[tex]t=\dfrac{v}{g-a}\\\\t=\dfrac{11}{10-4.55}\\\\t=2.01\ s[/tex]
So, 2.01 seconds is taken to reach a speed of 11 m/s.
A student walks 6 meters due east and then walks 10 meters due west from the history room to the reading room. The total distance travelled by the student is. m
Answer:
16
Explanation:
10+6=16
How is energy related to the change of state represented by the model?
Answer: atoms gain energy as a solid changes to a gas
Explanation:
Answer:
atoms gain energy as a solid changes to a gas
Explanation:
The movement of thermal energy from a warmer object to a cooler object is called a. heat. b. temperature. c. motion. d. momentum. Please select the best answer from the choices provided
The energy responsible for temperature is referred as thermal energy. the movement of thermal energy from a warmer object to a cooler object is called heat.
What is heat?Heat is energy that is transferred from one body to another as a result of a temperature difference.
When two bodies at different temperatures come into contact, energy is transferred (i.e., heat flows) from the hotter to the colder.
Thus, the correct option is A.
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A crowbar having the length of 1.75 m is used to balance a load of 500 N If the distance between the fulcrum and the load is 0.5 calculate MA and VR and efficiency
load distance*l=effort distance*e
o.5*500=x*1.25
250/1.25=x
200=x
ma=load/effort
500/200
2.5
vr=ed/ld
1.25/0.5
2.5
effciency=ma/vr*100
100%
Which statement correctly applies to a spinning mobile that changes its velocity over a period of time?
A. The combination of all forces acting on it is zero.
B. No net force is acting on it.
C. Forces are acting on it.
D. A nonzero net force is acting on it.
Answer: D
Explanation:
First, we know that the acceleration is defined as the ratio of change of the velocity.
This means that, if we have a change in the velocity, then we also have acceleration.
And by Newton's second law we know that:
F = m*a
Force equals mass times acceleration.
So if we have acceleration different than zero, then we should also have force different than zero.
So we must have a nonzero net force acting on it.
The correct option is D
Hello!
----------
The statement in which correctly applies to a car that changes its velocity over a period of time would be "a nonzero new force is acting on it."
Hope this helps! Also, if you need help with the rest of this assignment, I make a study set on Quizlet that may help you out with the other question. Thanks and good luck!
Quizlet - Unit 6: Lesson 3 Newton's Second Law
h t t p s : / / q u i z l e t . c o m / 7 3 7 7 7 5 3 2 0 / u n i t - 6 - l e s s o n - 3 - n e w t o n s - s e c o n d - l a w - f l a s h - c a r d s / ? n e w
The escape velocity of a rocket from the earth is 11kms^-1. Taking the acceleration due to gravity as 9.8ms^-2, calculate the radius of the earth.
Answer:
6.37*10^6 m
Explanation:
We know that,
g = GM/R²
values given to us
acceleration due to gravity = g = 9.8 m/s²
Mass of the earth is= 6.4*10^24
G = 6.67*[tex]10^{-11}[/tex]
implementing
9.8 = 6.67*10^-11 * 6*10^24/R^2
9.8 = 40.02 * 10^13/ R^2
R^2 = 4002/98 * 10^12
R^2 = 40.83* 10^12
R= 6.37*10^6 m (approximately)
The modern standard of length is 1 m and the speed of light is approximately 2.99792 x 10^8 m/s. Find the time change in t for light to cover 1 m at the given speed.
Explanation:
Distance = rate × time
1 m = (2.99792×10⁸ m/s) t
t = 3.33565×10⁻⁹ s
Light is the fastest thing in the universe. The speed of light is 2.99792 x 10⁸ m/s . The time that light takes to cover a distance of 1 meter is just 3.39 x 10⁻⁹seconds.
What is speed?Speed is a physical quantity that means the distance in meter covered by a moving body in one second. The speed of light is 2.99792 x 10⁸ m/s. Light from sun only takes 8 min to travel to the earth surface.
The speed of a moving particle or wave is mathematically the ratio of distance and time. Thus time of travel can be found out from the distance and speed.
It is given that the distance travelled by light is 1 m and its speed is 2.99792 x 10⁸ m/s. Thus the time taken to travel is calculated as follows:
Time = distance/speed
= 1 m/ (2.99792 x 10⁸ m/s)
= 3.39 x 10⁻⁹s
Therefore, the time that light takes to cover a distance of 1 meter is just 3.39 x 10⁻⁹seconds.
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A 4 kg kitten is sliding at 12 m/s on a horizontal frictionless surface. A constant force is applied that slows it with an acceleration of 3 m/s/s. How much work must this force do to stop the kitten
Answer:
288 Joules
Explanation:
Work= delta kinetic energy. To find the work required to stop the kitten, you have to find the delta kinetic energy between when the kitten is moving and when it is stopped. Since it is not moving when it's stopped, it has no kinetic energy. So to find the work, just find the kinetic energy of the kitten moving at 12m/s.
KE=1/2((m)(v^2)), therefore
delta KE=(1/2)*((4kg)*((12m/s)^2))-0
The work done must this force do to stop the kitten will be "288 Joules". To understand the calculation, check below.
Work done and AccelerationAccording to the question,
Mass of kitten, m = 4 kg
Speed, v = 12 m/s
Acceleration, a = 3 m/s²
We know the formula,
→ Kinetic energy, K.E = [tex]\frac{1}{2}[/tex] mv²
then,
→ ΔK.E = [tex]\frac{1}{2}[/tex] mv² - 0
By substituting the values, we get
= [tex]\frac{1}{2}[/tex] × 4 × (12)² - 0
= [tex]\frac{1}{2}[/tex] × 4 × 144 - 0
= 2 × 144
= 288 Joules
Thus the above response is correct.
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What is the relation between the gravitational force acting between any two bodies object with their masses and the distance between their centres?
Answer:
The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other. ... increases, the force of gravity decreases. If the distance is doubled, the force of gravity is one-fourth as strong as before.
A basketball player runs a drill in which he runs the
length of the 30.0 meter court and back. He does
this three times in 50.0 seconds.
30. m
(Not drawn to scale)
1. The magnitude of the player's total displacement
after running the drill is
(1) 0.0 m
(2) 30.0 m
(3) 60.0 m
(4) 180 m
Answer: (1) 0.0 m
Explanation: In physics, displacement is defined as the change in position of a moving object. It is a vector, so has magnitude and direction, determined by a referential create to the system, i.e., the moving object. Mathematically, displacement is calculated by: [tex]\Delta x=x_{f}-x_{0}[/tex], in which:
[tex]x_{f}[/tex] is the final position;[tex]x_{0}[/tex] is the initial postion;[tex]\Delta x[/tex] is the diplacement;For the basketball player, he runs 30m, 3 times, court and back. Assuming the initial position is 0:
[tex]\Delta x=0-0[/tex]
[tex]\Delta x[/tex] = 0.0
Since displacement is given by, only, the initial and final position and the player started at the initial point and ended at the initial point of the court, displacement is 0.
Greek engineers had the unenviable task of moving large columns from the quarries to the city. One engineer, Chersiphron, tried several different techniques to do this. One method was to cut pivot holes into the ends of the stone and then use oxen to pull the column. The 4-ft diameter column weighs 13200 lbs, and the team of oxen generates a constant pull force of 1500 lbs on the center of the cylinder G. Knowing that the column starts from rest and rolls without slipping, determine the velocity of its center G after it has moved 5 ft and the minimum static coefficient of friction that will keep it from slipping.
The velocity is a vector quantity. The velocity of center G of the column after it has moved 5 ft is 5.18 ft.
From work Energy equation:[tex]U_{12} = T_2[/tex]First, the potential energy of column,
[tex]U_{12} = \int\limits^5_0 {F} \, dx[/tex]
Here, the column moves from zero and displaces 5 ft.
[tex]F[/tex] - force = 1500 lbs
Thus,
[tex]U_{12 } = 7500\rm \ ft\ lbs[/tex]
Now, total kinetic energy at position 2,
[tex]T_ 2 = \dfrac 12 mv_2^{-2} + \dfrac 12 \vec I \omega_2^2[/tex]
Where,
m = 372.67 slugs
r = 2 ft
Since,
[tex]\omega_2 = \dfrac {\vec V}{r}[/tex]
So,
[tex]7500 = \dfrac {12000}{2g}v_2^{-2}+\dfrac {12000}{4g}r^2 \times \dfrac {\vec V}{r}\\\\\vec v_2 = 5.18 \rm \ ft[/tex]
Therefore, the velocity of center G of the column after it has moved 5 ft is 5.18 ft.
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A company wants to build a new type of spaceship for transporting astronauts to the moon. What should the company do first?A. Test the prototype.B. Evaluate the design.C. Build a model.D. Identify needs.
Answer: Identify needs
As a company wants to build a new type of spaceship for transporting astronauts to the moon. The company should identify the needs first. The correct option is D.
What is spaceship?A spacecraft is a vehicle or machine that is designed to travel through space.
Spacecraft, a type of artificial satellite, are used for a variety of purposes, including communications, Earth observation, meteorology, navigation, space colonization, planetary exploration, and human and cargo transportation.
In addition to science instruments, a spacecraft has a number of critical components such as an engine, power subsystem, steering system, and communications system.
The majority of these systems are housed in the service module, while the science instruments are housed in the payload module.
A company wishes to construct a new type of spaceship capable of transporting astronauts to the moon. The company should start by identifying the needs.
Thus, the correct option is D.
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Several motorboats with the same mass are used in an experiment. The forces of the different motors versus their accelerations are graphed. What is the y-intercept of this graph? (1point) Does anyone know the answer?
Answer:
C. the velocity
Explanation:
Answer:
1.) As rocket mass increases, acceleration decreases
2.) The inverse of the mass of the boat
3.) Zero
4.) When the velocity increases
5.) It increases
Explanation:
took the test, all were correct
Hi i was wondering if you could help me understand Kelvins? My question on my work says "Which of the following is the SI unit used in measuring the temperature of a hot cup of coffee" and the other question says, "Which of the following would be the SI unit to use in measuring the temperature of a hot liquid?" I said both are Kelvin but i dont really understand and i dont want to be wrong.
Answer:
Hey there!
Kelvin is correct. Farenheit and Celsius are scales derived from the Kelvin scale. For example, K=C+273.15 is the conversion between Kelvin and Celsius.
Let me know if this helps :)
Does anybody have an answer key to the nightmare land lab activity for earth systems?? I need help I dont get it:(
Answer: the answer key is in the pdf files below
Explanation:
astronauts feel weightlessness, why?
Answer:
They are weightless because there is no external contact force pushing or pulling upon their body.
Explanation:
Answer:
nope because the ground created a normal force
Explanation:
Cell theory, the theory of evolution, the theory of relativity, and the big bang theory are all examples of scientific theories. The law of inertia, the law of universal gravitation, the laws of thermodynamics, and the law of independent assortment are all examples of scientific laws. What is the primary difference between scientific theories and scientific laws? A. Scientific theories are often discarded and replaced by completely different theories. B. Scientific laws have been proven without exception under certain stated conditions. C. Scientific laws can change over time as new technology is developed and new data is collected. D. Scientific theories are educated guesses still need to be verified through experimentation.
Answer:
B
Explanation:
Answer:
B. scientific laws have been proven without exception under certain stated conditions.
Explanation:
a taller trees has greater chance to fall down than a shorter tree during storm
Answer:
Hi! This is true.
Explanation:
During a storm, high winds are persistent. Taller trees have a longer length than short trees, making the structural integrity lesser. Shorter trees are closer to the ground and have a small chance of falling.
Hope this helped!
Describe the process by which a main sequence star turns into a black dwarf.
(draw a flow chart)
Answer:
A main sequence star that lacks the mass necessary to explode in a supernova so it goes KAbooM and then will become a white dwarf, a 'dead' star that has burned through all of its hydrogen and helium
eventually stop emitting light and heat and become black dwarfs.
I am primarily made of calcium. I protect and act as camouflage. I can be found as a filler in most household spices. What am I?
Answer:
Explanation:
Bones?
Bones are primarily made of calcium. Also, they protect the body, which is pretty much obvious. They also act as camouflage.
The only but I have is, can they be found as a filler in most household?
Asides that, bones pretty much fits in to the answer.
Calculate the pressure exerted on a level ground by a man whose mass is 75kg and the area of both his feet is 280 cm2. Give your answer in Pascal (Pa)
Given:-
Mass = 75 kg280 cm² = 280/10000 m² = 28/1000 m²To be calculated:-
Calculate the pressure exerted on a level ground.
Formula used:-
Pressure = Force/Area
Solution:-
First of all,
We have to find out Force ;
Force = m × g
Force = 75 kg × 9.8 m/s²
Force = 735 kg.m/s² [ 1 N = kg.m/s² ]
Force = 735 N
Now,
Pressure = Force/Area
Pressure = 735 / 28/1000
Pressure = 735 × 1000 / 28
Pressure = 735000 / 28
Pressure = 26,250 Pascal
12. You are building a go-cart. You want to know how you can make it go as fast as it can.
Explain how you can use both chemistry and physics to help you build your go-cart (5 points). I
Answer:
Physical measures: Reduction of internal friction, high static friction tire system
chemist. : air-fuel ratio as efficient
Explanation:
A go-Kart is a vehicle that can be with a motor or with pedals, which is in contact with the ground.
Physical measures that help increase vehicle speed are:
* Reduction of internal friction, use bearings, with greased joints to reduce friction
* Decreased friction when forward creating an aerodynamic raindrop shape, sharp at the front and with a rapid descent at the rear, but without abrupt cuts to the geometry
* Path difference for air passing through the top and bottom, to create a downward force help lower the car by increasing speed
* A high static friction tire system so you can move faster on surfaces and take turns faster
* A shifting system to have an effective torque either pedal or motor, gear shifting system
From the point of chemist.
* Obtain an air-fuel ratio as efficient as possible to increase the force per unit of fuel.
Can scientific ideas and concepts be changed? Why or why not?
Answer:
Yes
Explanation:
Scientific concept is a scientific theory or law that gives proof of how and why a natural event or process occurs.
Yes, scientific ideas and concepts can be changed because the research never stop and when scientists come with a new theory which is more strong than old theory, the old theory is required to be changed.
For example: In the scientific concept of classification of biodiversity, earlier organisms were classified into binomial system including plant and animal kingdoms but now we have five kingdoms that includes monera, protists, fungi, plant and animal kingdoms.
when a constant force acts upon an object the acceleration of the object varies inversely with its mass. when a certain constant force acts ipon an objec twith mass 21khm the accerlation of the object is 3 m/2^2. If the same force acts upon another object whose mass is 9kg. What would this object's acceleration be?
Explanation:
When a constant force acts upon an object the acceleration of the object varies inversely with its mass.
[tex]a\propto \dfrac{1}{m}[/tex]
or
[tex]\dfrac{a_1}{a_2}=\dfrac{m_2}{m_1}[/tex]
If m₁ = 21 kg, a₁ = 3 m/s², m₂ = 9 kg
We need to find a₂
So,
[tex]a_2=\dfrac{m_1a_1}{m_2}\\\\a_2=\dfrac{21\times 3}{9}\\\\a_2=7\ m/s^2[/tex]
So, if mass is 9 kg, its acceleration is 7 m/s².
Answer:
A AND B
Explanation:
If the maximum acceleration that is tolerable for passengers in a subway train is 1.21 m/s2 and subway stations are located 810 m apart, what is the maximum speed a subway train can attain between stations
Answer:
v = 44.27 m / s
Explanation:
This is an exercise in kinematics since they ask the maximum speed of the train
v² = v₀² + 2 a x
a train departs with zero initial velocity
v² = 2 a x
v = √ 2ax
calculate
v = √ (2 1.21 810)
v = 44.27 m / s
in this solution we have assumed that the train uses the entire distance with acceleration
The AC voltage source is connected to an inductor and a resistor in series. If the frequency of the source is increased the current in the circuit will _________.
Answer:
If the frequency of the source is increased the current in the circuit will decrease.
Explanation:
The current through the circuit is given as;
[tex]I = \frac{V}{Z}[/tex]
Where;
V is the voltage in the AC circuit
Z is the impedance
[tex]Z = \sqrt{R^2 + X_L^2}[/tex]
Where;
R is the resistance
[tex]X_L[/tex] is the inductive reactance
[tex]X_L[/tex] = ωL = 2πfL
where;
L is the inductance
f is the frequency of the source
Finally, the current in the circuit is given as;
[tex]I = \frac{V}{\sqrt{R^2 + (2\pi fL)^2} }[/tex]
From the equation above, an increase in frequency (f) will cause a decrease in current (I).
Therefore, If the frequency of the source is increased the current in the circuit will decrease.