hi im a little stuck on this question that came from my textbook in class it got a little confusing for me because i really dont know how to taxle this problem especially because of the fact that the problem is talking about pushing and not tension.
it writes
"A 1,480-N crate is being pushed across a level floor at a constant speed by a force F of 370 N at an angle of 20.0 degrees below the horizontal, as shown in the figure a below. The floor has some amount of friction. "
The questions ask me to make a "free-body diagram"
- write an equation each for the x & y components of the resultant force
-determine the normal force and lastly what exactly is the coefficient of kinetic friction between the crate and the floor
Answers
Consult the attached free body diagram.
By Newton's second law, the net force on the crate acting parallel to the surface is
∑ F[para] = (370 N) cos(-20°) - f = 0
(this is the x-component of the resultant force)
where
• (370 N) cos(-20°) = magnitude of the horizontal component of the pushing force
• f = magnitude of kinetic friction
The crate is moving at a constant speed and thus not accelerating, so the crate is in equilibrium.
Solve for f :
f = (370 N) cos(-20°) ≈ 347.686 N
The net force acting perpendicular to the surface is
∑ F[perp] = n - 1480 N - (370 N) sin(-20°) = 0
(this is the y-component of the resultant force)
where
• n = magnitude of normal force
• 1480 N = weight of the crate
• (370 N) sin(-20°) = magnitude of the vertical component of push
The crate doesn't move up or down, so it's also in equilibrium in this direction.
Solve for n :
n = 1480 N + (370 N) sin(-20°) ≈ 1606.55 N ≈ 1610 N
Then the coefficient of kinetic friction is µ such that
f = µn ⇒ µ = f/n ≈ 0.216
Related Questions
Which of the following would you expect to
be a strong electrolyte in solution?
(a) H2O
(b) HCI
(c) sugar
(d) alcohol
Answers
Answer:
HCI
Explanation:
HCI is a strong electrolyte and an acid.
Dolphins communicate underwater using sound waves. This is called ________.
A. waving
B. radar
C. wave sensing
D. echolocation
Answers
Answer:
D. echolocation
Please mark my answer the brainliest and rate me 5 star and follow meplease please please please please please
Answer:
D. echolocation
Explanation:
Dolphins communicate underwater using sound waves. This is called echolocation
In a footrace between two runners, is it possible for the second-place finisher have a greater speed
at the finish line than the winner?
Answers
Answer:
no
Explanation:
this may be wrong, but i would assume no because they have to cover the same distance therefore the faster runner would cross the finish line first.
What is the effect of using uranium on the environment? Please don’t search it up at any other website.
Answers
Answer:
Positives:
- The Electricity is Carbon-free
- The Power Stations have a 'Small Land Footprint' and a very High Power Output
Negatives:
- Can produce decay products which are harmful such as Nuclear Waste
- Non-renewable Source of Energy
Answer:
Uranium is radioactive
Explanation:
By using and enriching uranium you will expose the environment to EM radiation which is harmful to organisms, either through the uranium directly or through its waste products.
There are two bulb with different watts. A bulb has heigher wattage than B.
Which will shine brighter in :-
series
parallel
Answers
A 6 volt battery delivers 48 watts to two identical light bulbs that are connected in parallel. Determine the resistance of each bulb.
Answers
Answer: 0.75 Ohms
Explanation:
Use the Joule heating law stating that the power is equal to the square of the voltage over the resistance:
[tex]P=V^2/R[/tex]
Plug everything in:
[tex]48=(6^2)/R[/tex]
[tex]R=6^2/48[/tex]
[tex]R=36/48=0.75[/tex]
If the mass of a car is 1,100 kg and its momentum is 22,000 kg
m/s, then what is its velocity?
Answers
In variable form, this is the same as p=mv.
Therefore:
22,000=1,100v
v = 20 m/s
The velocity of the car will be [tex]V=18.18\ \frac{m}{s}[/tex]
What will be the velocity of the car?As velocity is the movement of the car with respect to time.
It is given that
Mass m = 1100kg
Momentum= 22000 [tex]\frac{kgm}{s}[/tex]
The momentum is given as
[tex]P=mv[/tex]
[tex]v=\dfrac{p}{m}[/tex]
[tex]v=\dfrac{22000}{1100} =18.18 \ \dfrac{m}{s}[/tex]
Thus the velocity of the car will be [tex]V=18.18\ \frac{m}{s}[/tex]
To know more about momentum follow
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the period of a pendulum is measured to be 3.00s in the refrence frame of the pendulum.what is the period when measured by an observer moving at a speed of 0.960c relative to the pendulum?
Answers
Answer:
Δt = Δτ / (1 - β^2)1/2
Δt is the time observed
Δτ is the proper time (3.00 s)
β = v / c = .96
Δt = 3.00 / (1 - .96^2)^1/2 = 10.7 sec
greenhouse gases effect is caused primarily by which processes?
a- absorbing outgoing long wave radiation from the earth
b- absorbing incoming short wave solar energy.
c- heating of the earth stratosphere
d- blocking incoming short wave solar energy
Answers
Absorbing outgoing long wave radiation from the earth.
) The boy then walks to a village. The displacement from his starting point is (400, -50) m. How much gravitational potential energy did he lose going from the top of the hill to the village?
Answers
The boy would lose 25000 Joules going from the top of the hill to the village.
What is potential energy?Potential energy is the energy stored in an object as a result of its position in relative with another object. It is given by:
Potential energy = mass * acceleration due to gravity (g) * height.
g = 10 m/s²
Let us assume the boy has a weight of 50 kg. His starting point is (400, -50) m. This means the hill is 50 m high and 400 m from the village.
Potential energy = 50 * 10 * 50 = 25000 Joules
The boy would lose 25000 Joules going from the top of the hill to the village.
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A ball is moving up a hill at 20 meters per second, and is decelerating at a uniform rate of 2 meters per second squared. What is its velocity after 5 seconds? Assume the direction up the hill is positive.
Answers
Answer:
-12meters per secondExplanation:
2^5=32-20=-12 meters per sec (going backwards).
If this is correct pls mark me. brainly to let me know, tyy C:
please help oooooooo
Answers
Answer: Can't see clearly.
Explanation:
Which of the following is the most appropriate description of an electric current?
Answers
If this isn’t what your looking for I need the options they gave you
Block 1 is sliding toward identical block 2 on a surface of negligible friction. In situation 1, after the two blocks collide, the block 1 stops and block 2 moves off to the right. It situation 2, the two blocks collide and stick together. Which of the following claims correctly describes the motion of the center of mass of the two-block system and provides reasoning for that claim?
In situation 1, the center of mass never changes its speed, because block 1 is moving before the collision, and block 2 is moving after the collision.
Answer A: In situation 1, the center of mass never changes its speed, because block 1 is moving before the collision, and block 2 is moving after the collision.
A
In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.
Answer B: In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.,
B
In situation 2, the center of mass slows down after the collision but continues to the right, because the blocks are always moving to the right.
Answer C: In situation 2, the center of mass slows down after the collision but continues to the right, because the blocks are always moving to the right.
C
In situation 2, the center of mass slows down after the collision but continues to the right, because the direction of motion of the center of mass never changes direction in a collision.
Answer D: In situation 2, the center of mass slows down after the collision but continues to the right, because the direction of motion of the center of mass never changes direction in a collision.
D
In situation 2, the center of mass has a zero velocity, because the velocity of the center of mass of the system is always zero.
Answers
Answer:
Explanation:
Situation 1 describes an elastic collision in which momentum is conserved while situation 2 is an inelastic collision in which momentum is not conserved.
When momentum is conserved, the speed of center of mass will not change. So the correct answer is Answer B: In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.
Answer:
A
Explanation:
Answer A: In situation 1, the center of mass never changes its speed, because block 1 is moving before the collision, and block 2 is moving after the collision.
In situation 1, the center of mass never changes its speed, because there are no net external forces on the system before, during, or after the collision.
Hope it helped~
what is the formular for kinetic friction
Answers
Answer:
Kinetic friction is related to the normal force N by f k = μ k N f k = μ k N ; thus, we can find the coefficient of kinetic friction if we can find the normal force on the skier
Explanation:
The Himalayan mountains at the border of the Indo-Australian
and Eurasian plates is caused by a _________ boundary.
A. conservative
B. collision
C. constructive
D. destructive
Answers
Conservative
I think it’s A I hope this helps
The driver of a car driving at 72 km/h hits the brakes to stop the car. If the deceleration is 2.0 m/s², calculate the the time needed to stop the car.
HELP ASAP
Answers
Answer:
it is preaty simple
Explanation:
72/2=36
i hope, that helps, if no i'm sorry
Who will create a greater pressure, a heavy person standing on a bed or a lighter person lying on the bed? Explain your answer.
Answers
Answer:
a heavy person standing on a bed
Explanation:
The heavy person will have more mass than the lighter person, so they will create greater pressure.
A _________________ is one that forms where rays converge
Answers
Answer:
real image
I hope this helps you
:)
FIGURE 4.1 shows a rectangular wire loop 0.3 m x 0.2 m moving horizontally to the right at 12 ms -1 in a uniform magnetic field of 0.8 T. The induced current in the wire is 3 A.
(i) Determine the resistance of the wire loop
(ii) Determine the direction of the induced current. Explain how you determine the direction of the induced current.
Answers
[tex]\underline{\underline{\large\bf{Solution:-}}}\\[/tex]
(I) Emf developed,E in the loop is given as:
[tex]\begin{gathered}\\\implies\quad \sf E = BLv \\\end{gathered} [/tex]
[tex]\begin{gathered}\\\implies\quad \sf E = 0.8 \times 0.3 \times 12 \\\end{gathered} [/tex]
[tex]\begin{gathered}\\\implies\quad \sf E = 2.88 V \\\end{gathered} [/tex]
[tex]\longrightarrow[/tex]I = E/R
[tex]\quad[/tex]R = E/I
where
R = resistanceE = Induced EMFI = Current[tex]\begin{gathered}\\\implies\quad \sf R = \frac{2.88}{3} \\\end{gathered} [/tex]
[tex]\begin{gathered}\\\implies\quad \boxed{\sf{ R = 0.96 \;ohm}}\\\end{gathered} [/tex]
(ii) The direction of current induced is from P to Q which is given by B × V vector . It may also be explained by Lenz law. Since magnetic field is from S to N . The fingers of the right hand are placed around the wire so that the curling of fingers will show the direction of the magnetic field produced by the wire then the thumb points in the direction of current flow which is from P to Q.
what is photography ??
Answers
Answer:
Photography is the art, application, and practice of creating durable images by recording light, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film.
Explanation:
In the definition of photography:
the art or process of producing images by the action of radiant energy and especially light on a sensitive surface (such as film or an optical sensor)
Purpose of photography:
To communicate and document moments in time.
Explanation:
When you take a photograph and share it with others, you're showing a moment that was frozen through a picture. This moment can tell someone many things, from the environment to what people are doing.
Hope this helps you.
Answer:
It's an art or an application of clicking photos .
An object is 3.0 cm from a concave mirror, with a focal length of 1.5 cm. Calculate the image distance. Remember to include your data, equation, and work when solving this problem. A concave mirror is shown with curvature positioned at 8 on a ruler that goes from 0 to 14 centimeters. The object is located at 5, and the focal point is located at 6.5.
Answers
This question involves the concepts of focal length and mirror formula.
The image distance will be "1 cm".
MIRROR FORMULAThe mirror formula relates the focal length, image distance, and object distance through the following formula:
[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]
where,
f = focal length =1.5 cmp = object distance = 3 cmq = image disance = ?Therefore.
[tex]\frac{1}{1.5\ cm}=\frac{1}{3\ cm}+\frac{1}{q}\\\\\frac{1}{1.5\ cm}-\frac{1}{3\ cm}=\frac{1}{q}\\\\0.667 + 0.333 = \frac{1}{q}\\\\[/tex]
q = 1 cm
Learn more about mirror formula here:
https://brainly.com/question/3459308
Answer:
The image distance is 3.0 cm
Explanation:
Object distance: 3.0 cm Focal length: 1.5 cm Image distance: ? cm
1/f=(1/ do）+（1/di)
1/1.5=(1/3.0)+(1/x)
(2/3)-(1/3)=1/x
1/3=1/x
x=3.0 cm
The image distance is 3.0 cm.
The flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.27 rad/s^2. It accelerates for 27.5 s, then maintains a constant angular velocity. Calculate the total angle through which the wheel has turned 66.1 s after it begins rotating.
Answers
With a constant angular acceleration of 1.27 rad/s^2 and acceleration of 27.5 s, is mathematically given as
[tex]\theta = 1848 radians[/tex]
What is the total angle through which the wheel has turned 66.1 s after it begins rotating?Generally, the angular velocity is mathematically given as
w2 = 0 + 1.27*27.9
w2 = 35.43 rad/s
Therefore
[tex]\theta1 = 0.5*1.27*27.9*27.9[/tex]
[tex]\theta2 = w2*(66.1-27.9)\\\\\ \theta = \theta1 + \theta2[/tex]
[tex]\theta = 1848 radians[/tex]
In conclusion, the total angle is
[tex]\theta = 1848 radians[/tex]
Read more about Angle
https://brainly.com/question/14362353
Sally is investigating electromagnets. She is going to change the number of turns on the coil of
wire and investigate how this affects the strength of the electromagnet.
a I Name one variable Sally must keep the same each time she tests her electromagnet.
Answers
Answer:
The number of turns in a coil
Explanation:
Which of the following is not a sub-discipline of basic sciences?
a.
Physics
b.
Chemistry
c.
Mathematics
d.
Logic
Answers
Answer:
D
Explanation:
Physics and Chemistry are the most basic disciples in science, so the answer is not A or B.
Mathematics is the language of science; it could be the answer.
Most likely, you are looking for logic which describes the validity of an argument that has already been developed. I would pick D, but your marker may not agree.
explain 4 factors affecting centripetal acceleration
Answers
Answer:
it's speed
mass of the object
and the radius of the circle
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance?
Answers
The work done on the mouse by air resistance is equal to 196 Joules.
Given the following data:
Mass = 200 grams to kg = 0.2 kg.
Distance = 100 meters.
Scientific data:
Acceleration due to gravity = 9.8 [tex]m/s^2[/tex]
How to calculate work done.In Science, work done is generally calculated by multiplying force and the vertical distance or displacement experienced by an object.
Mathematically, work done is given by the formula:
[tex]Work\;done = force \times displacement = mgh[/tex]
Substituting the given parameters into the formula, we have;
[tex]Work\;done = 0.2 \times 9.8 \times 100[/tex]
Work done = 196 Joules.
Read more on work done here: brainly.com/question/22599382
Calculate the average acceleration of a car that changes speed 0 m/s to 15 m/s in 5 s
Answers
Answer:
Explanation:
average acceleration= (15-0)/5
=15/5
3ms-2
A hurricane that has winds between 74 and 95 miles per hour and causes some damage would be classified as a Category _______ storm.
1
3
2
4
Answers
Answer:
Category 1
Explanation:
I hope this helps
Answer: CAT-1
Explanation:
I need at least 20 lab safety hazards listed from this picture and I’m so lazy
Answers
Answer:
1. messy
2. unorganized
3. dangerous
4. not a safe place
5. chemicals everywhere
6. hazardous
7. no adult in room
8. no guidance
9. children do not know what their doing
10. sharp objects
11.messing around
12. child messing around on high areas
13. can cause dangerous chemical reactions
15.adult may not know the children are in the room
16 the adult may be irresponsible
17.do not have experience
18. unprofessional
19. may get adult in trouble
20. is responsible or may not be.
Unorganized
Dangerous
Not a safe place