A box having a mass of 0.2 kg is dragged across a horizontal floor by
means of a rope tied on the front of it. The coefficient of sliding friction
between the box and the floor is 0.2. If the angle between the rope and
the floor is 15º, what force must be exerted on the rope to move the box
at constant speed.
Answers
you can check attachment for answer.
kind regards
A force of 0.385 N must be exerted on the rope to move the box at a constant speed.
What is kinetic friction?Kinetic friction can be explained as a force that applies between moving surfaces of objects. A body moving on the surface will experience a force in the opposite direction. The friction force will depend on the coefficient of kinetic friction between the two bodies.
The mathematical expression of the kinetic friction can be represented as:
F = μ N
where 'μ' represents the coefficient of Kinetic friction.
Given, the mass of the box, m = 0.2 Kg
The coefficient of friction, μ = 0.2
The angle, θ = 15°
From the second law of motion:
F = ma
Fcosθ - f = 0
Fcosθ = μ N
[tex]\displaystyle F =\frac{\mu mg}{cos\theta + \mu sin\theta}[/tex]
[tex]\displaystyle F =\frac{0.2\times 0.2\times 9.8}{cos15 + 0.2 sin15}[/tex]
F = 0.385 N
Therefore, the force exerted is equal to 0.385 N.
Learn more about kinetic friction, here:
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Related Questions
A 24.8 tall object is placed in front of a lens, which creates a -3.09 cm tall image. What is the magnification?
Answers
Answer: 0.125
Explanation:
Given that the
Object height U = 24.8 cm
Image height V = 3.09 cm
Magnification M is the ratio of the image height to the object height. That is, divide the given image height by the given object height.
M = V/U
Substitute V and U into the formula above.
M = 3.09/24.8
M = 0.125
Magnification is therefore equal to 0.125 approximately
Answer:
-0.125.
Explanation:
The previous explanation is right except for that it doesn't take into account that the -3.09 is negative – therefore, the positive answer is incorrect.
-0.125 is correct on Acellus.
What is the mechanical advantage of the simple machine pictured?
A. 8.3
B. 14.7
C. 1.9
D. 20.4
Answers
Answer:
[tex]D.\ 20.4[/tex]
Explanation:
The simple machine in the attachment is a screw; so, I'll list the given parameters using related terms
Given
Radius of the screw (r) = 2.6m
Pitch (P) = 0.8m
Required
Calculate the Mechanical Advantage (M.A)
M.A is calculated as thus;
[tex]MA = \frac{2\pi r}{P}[/tex]
Substitute 2.6 for r; 0.8 for P and 3.14 for [tex]\pi[/tex]
[tex]MA = \frac{2\pi r}{P}[/tex]
[tex]MA = \frac{2 * 3..14 * 2.6}{0.8}[/tex]
[tex]MA = \frac{16.328}{0.8}[/tex]
[tex]M.A = 20.41[/tex]
From the list of given options, the approximated answer is D. 20.4
Which is developed during the process of technological design?
solution
experiment
conclusion
summary
Answers
Answer: SOLUTION
Explanation: A technological design is often adopted when there is a need to solve or find solution to a certain or identified problem. The technological design process is often required in other to develop technologically driven products which is capable of providing solution to a perceived problem. The steps involved includes;
Identifying the problem at hand, carrying out further and thorough research on them, proferring possible solutions out of which the best possible approach is selected. Then the solution is modeled, the model is tested and refinements are made depending on outcome of the test. Testing will have to be repeated upon refinement of the model before the final outcut is communicated.
Answer:
sulution
Explanation:
I took the test.
Which term describes an observable fact, event, or circumstance?
A. Experiment
B. Theory
C. Hypothesis
D. Phenomenon
Answers
Answer:
Phenomenon
Explanation:
phe·nom·e·non
/fəˈnäməˌnän/
noun
1.
a fact or situation that is observed to exist or happen, especially one whose cause or explanation is in question:
"glaciers are unique and interesting natural phenomena"
synonyms
occurrence, event, happening, fact, situation, etc.
2.
a remarkable person, thing, or event:
"the band was a pop phenomenon just for their sales figures alone"
synonyms
marvel, sensation, wonder, prodigy, miracle, etc.
How many electrons do carbon and oxygen share
Answers
Answer:
1
Explanation:
To satisfy the Octet Rule, Carbon needs 4 more valence electrons. Since each Oxygen atom has 3 lone pairs of electrons, they can each share 1 pair of electrons with Carbon; as a result, filling Carbon's outer valence shell
Answer:
The Answer Is 4!!
Explanation:
Hope This Helps:)))
Waves that collide with a barrier will reflect at an angle equal to the angle of incidence.
True
False
Answers
Answer:
True
Explanation:
This is a fundamental concept in physics dealing with the nature of waves where when the waves collide with a barrier such as wall or some form of surface will reflect at an angle equal to the angle of incidence.
The answer is true
PLS ANSWER (SCIENCE QUESTION) I WILL MARK U AS THE BRAINLIEST!!! PLS ANSWER REALLY EASY!!
Q1. Fill in the blanks:
1. __________________ are the building blocks of matter.
2. Each ________________ has a chemical symbol.
3. ________________ is used in oxy- acetylene flame for welding.
4. Noble gasses are also called __________________.
5. Dimitri Ivanovich Medeleeve arranged the elements systematically in _______________
6. Elements are the simplest kind of __.
7. Metals have __ melting and boiling points.
8. As you move from the left side of the periodic table to the right side, the elements become __________ .
Answers
Answer:
1. Atoms
2. element
Which of the following is an example of heat convection?
Answers
This is because : Everyday Examples of Convection
Boiling water - The heat passes from the burner into the pot, heating the water at the bottom. Then, this hot water rises and cooler water moves down to replace it, causing a circular motion. Radiator - Puts warm air out at the top and draws in cooler air at the bottom.
Not sure if it’s right tho!
Answer:
Liquid inside a beaker on a hot Bunsen burner circulates and heats through constant motion.
Explanation:
Transmission of heat by convection requires the movement of a liquid or gas. An example would be liquid in a beaker heating up as hot and cold parts of the liquid constantly circulate, which further heats the liquid. Heat from the sun is considered radiation, and the other two answers are examples of conduction.
The diagram illustrates the evolution of the universe, starting from the big bang. Each concentric circle represents a stage in the evolution as stated by the big bang theory. The arrows illustrate the changes that happened after the big bang and leading up to the stage where gases were formed that later led to the formation of stars and galaxies. Choose the inaccurate statements on the diagram.
Answers
Answer: The two correct answers are Universe became more dense and universe became less transparent.
Explanation: I took the test and those are correct
The incorrect statements on the diagram universe became more dense Universe became less transparent.
What is the universe?The universe is the whole cosmic system of matter and energy. The Earth, the Sun, the Moon, the planets, and the stars along with the dust, gases, and rocks form the universe.
The big bang is the theory that explains how the universe began. It says that the universe began with just a single point. It went on expanding and stretched to grow as large as possible. It is still now expanding.
The diagram (attached) illustrates the evolution of the universe, starting from the big bang. Each concentric circle represents a stage in the evolution as stated by the big bang theory.
Thus, the inaccurate statements on the diagram universe became more dense Universe became less transparent.
Learn more about the universe.
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Compute the conductivity of a conductor with a length of 2.0 cm and a cross-sectional area of 0.060 cm2, whose conductance is 3.5 x 103 ohms. σ = _____ ohm-1cm-1 A: 1.2 x 10 5 B: 2.9 x 10 -4 C: 1.1 x 10 2 D: 1.9 x 10 6
Answers
Answer: A
Explanation:
You are given the following parameters:
Length L = 2.0 cm and
cross-sectional area A = 0.060 cm^2
Conductance = 3.5×10^3 ohms
Conductance is a reciprocal of resistance R
Conductance = (σ × A)/L
Where σ = conductivity
Substitutes all the parameters into the formula
3.5×10^3 = (0.06 × σ)/2
Cross multiply
7×10^3 = 0.06σ
Make σ the subject of formula
σ = 7000/0.06
σ = 116666.67 ohm-1cm-1
σ = 1.2 ×10^5 ohm-1cm-1 approximately
Answer:
1.2 ×10^5
Explanation:
This is an example of A) alpha decay B) beta decay C) gamma decay D) half-life decay
Answers
Answer:
The answer is option A.
alpha decay
Hope this helps
Which method is used to separate parts of a solution when the entire solution can pass through a filter?
Answers
Answer:
Straining method
Explanation:
Straining method is the method that can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter.
A car has a mass of 8000 kg and a kinetic energy of 24,000 J. What is its
speed?
A. 1.7 m/s
B. 2.4 m/s
C. 6 m/s
D. 3 m/s
Answers
Answer:
2.4
Explanation:
48,000/8000=6
square root of 6 = 2.44948974278
so 2.4
AnswerB.2.4m/s
Explanations;
24000=1/2×8000×v^2
24000/4000=v^2
√ 6.=v
v=2.4
What is the resultant force?
8 NA
14 N
3N
3N
22 N
Answers
Answer:
option will be ''B'' 0N
Explanation:
There are two forces acting upward 8N and 14N which is equal to 22N(upward force)
since, 22N is also acting downwards
both the forces will cancel each other and the the outcome will be zero.
Now, there is a 3N force acting on the left and right. So, they too, will cancel each other and the result will be zero.
In simple words, the box won't move in any direction Since it's being pulled with equal strength from all sides.
hope this helps
Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal? increasing the inertia of the car decreasing the reaction force increasing the action force decreasing the mass of the car Mark this and return
Answers
Answer:
d. decreasing the mass of the car
Explanation:
Engineers are trying to improve race cars. Their goal is to increase the acceleration of the car using the same engine, it can be achieved by decreasing the mass of the car, therefore the correct answer is option C.
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
As given in the problem Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine,
The acceleration of the car can be increased by decreasing the mass of the car assuming the engine of the car is producing the same amount of force.
Thus, the acceleration can be increased by decreasing the mass of the car, therefore the correct answer is option C.
To learn more about Newton's second law, here refer to the link given below ;
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The degree to which a liquid resists flowing is called _____.
Answers
Answer:
Viscosity is a measure of how much a liquid resists flowing freely.
Answer:
velosity is the anser
Explanation:
sorry for the spelling
when taking a shower are girls suppose to wipe front to back ?
Answers
Answer:
Explanation:
I don't think it matters while taking a shower, however, while using the restroom, it is especially encourgaed to wipe front to back. The reasoning behind this is to prevent UTI's that are transferred by fecal particles and bacteria from the anus into the vagina. Hope this helps:)
What is the slope of the line plotted below?
A. 1
B. -2
C. 2
D.-1
Answers
Answer:
B. -2
Explanation:
Since the line is coming from the top left to the bottom right, you know the line is going to be negative.
If you take two points, so (0,1) and (1,-1), and use the formula y2-y1/x2-x1, after substitution you should get -1-1/1-0. If you simplify, the answer should be -2/1 or -2.
What type of quantity is momentum?
It is a scalar quantity because it involves magnitude only.
It is a vector quantity because it involves magnitude only.
It is a scalar quantity because it involves magnitude and direction.
It is a vector quantity because it involves magnitude and direction.
Answers
Answer: It is a vector quantity because it involves magnitude and direction.
Explanation:
momentum has magnitude and direction
Magnitude is a Scalar quantity
direction is a vector quantity
scalar times a vector is a vector
The type of quantity momentum has is that of a vector and it is denoted as option D.
What is a Vector quantity?
This is the type of quantity which has magnitude and direction present in it and momentum has the both.
The formula is mass × velocity in which velocity is a vector quantity which makes it that too.
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What happens to the gravitational force between two objects as the distance between them decreases?
Answers
Answer:
gravitational force increases
Explanation:
Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are brought closer to each other, the force of gravitational attraction between them also increases.
what are AR,L,K in the periodic table
Answers
Answer:
Argon, Lithium and Potassium
Explanation:
Answer:
AR=Argon, L=Lithium K=Potassiaum
Explanation:
Why is this equation wrong?
Answers
Answer:
It is not possible to find the square root in such a way
Explanation:
How is an ammeter connected to a circuit?
Answers
Answer:
Ammeter- It is an instrument use to measure the amount of current passing through the circuit.
In a circuit an Am-meter is connected in series with the device to measure its current.
Ammeter is a device which measures Current in an Electric Circuit
Ammeter is connected in series *before* the resistances in an Electrical Circuit
Hope it helps ya
Please answer this question
Answers
Answer:
Volume of the tank = 3m³
Mass of total water = 3,000 kg
Explanation:
Given:
Measurement of tank = 2m × 1.5m × 1m
Density = 1,000 kg/m³
Find:
Volume of the tank.
Mass of total water.
Computation:
⇒ Volume of the tank = lbh
Volume of the tank = 2m × 1.5m × 1m
Volume of the tank = 3m³
⇒ Mass of total water = Volume of the tank × 1,000 kg/m³
Mass of total water = 3m³ × 1,000 kg/m³
Mass of total water = 3,000 kg
Answer:
length x width x height = volume
2 x 1.5 x 1 = 3m
3m^3 is the volume
1000 km/ m^3 x 3m^3 = 3000^3 km
Hope this helps
Explanation:
Resistance and resistivity are related by a:
A: factor that is dependent on the length of the material
B: proportionality constant dependent on the source of the material
C: factor that is dependent on the area of the material
D: proportionality constant dependent on the identity of the material
Answers
Answer: D
Explanation: Resistance of current in a wire is directly proportional to the length of the wire and inversely proportional to the cross - sectional area of the wire. That is,
R = (rho × L)/A
Where
L = length of the wire
A = cross sectional Area of the wire
rho = resistivity = proportionality constant which depends on the quality of the wire.
Therefore, Resistance and resistivity are related by a:
proportionality constant dependent on the identity of the material.
When is a train on Earth in motion relative to the sun? A It is relative to the sun only when the train is not moving. B It is never in motion relative to the sun. C It is relative to the sun only when the train is moving. D It is always in motion relative to the sun.
Answers
Answer:
A. It is relative to the sun only when the train is not moving.
Explanation:
Which of the following is a personal decision that involves science A)It is immoral to cheat on your homework? B)what movie will I like the most this weekend? C)will an air purifier reduce the dust in my house? D)is $100 a reasonable price for a cell phone?
Answers
Answer:
C because air purifier is very essential in dusty homes .
Answer:C
Explanation: The answer is C because an air purifier purifies the air in your room which is science.
Which is not a compound?Which is not a compound? water gold sugar silicon dioxide
Answers
Answer:
gold, silicon
Explanation:
i think this is the write answer
Answer:
Gold is not a compound
Explanation:
Plz Help me with this ?
Answers
Answer:
the answer is c part.
Explanation:
hope it helps.
Answer:
The answer is C How many times the heart beats in one minute.
_____ is considered a significant digit when it is to the left or the right of the decimal point and it follows a non-zero digit, or when it is betwee two digits.
Answers
Answer:
Zero (0)
Explanation:
Zero is only counted significant in some cases, and some of those are listed in the question.
For eg, 0.0003 (here 0 is insignificant), however, 3000.003 (here all 0's are significant)