An 870 N firefighter, F_ff, stands on a ladder that is 8.00 m long and has a weight of 355 N, F_ladder. The weight of the ladder acts at its center, and the ladder is leaning against a smooth wall at an angle of 50.0° between the ladder and the ground. The firefighter stands at a point 6.30 m from the base of the ladder. The ground is not smooth and exerts a force, F_ground, on the ladder to keep it from slipping. Determine the forces that the wall puts on the ladder, F_wall, and that the ground puts on the ladder, F_ground.
Answers
Answer:
Explanation:
Weight of the ladder is 355N
WL = 355N
The weight of the ladder acts at center of the ladder I.e at 4m from the bottom
Weight of firefighters is 870N
Wf = 870N
The fire fighter is at 6.3m from the bottom of the ladder.
N1 is the normal force exerted by the wall
N2 is the normal force exerted by the ground
Using Newton law
Check attachment
ΣFy = 0, since body is in equilibrium
N₂ - WL - Wf = 0
N₂ = WL + Wf
N₂ = 870 + 355
N₂ = 1225 N
This the normal force exerted by the ground on the wall.
Now to get N₁, let take moment about point A
So, before we take the moment we need to make sure that the forces are perpendicular to the plane(ladder), we need to resolve the weight of the ladder, firefighter and the normal of the wall to be perpendicular to the plane.
ΣMa = 0
Clockwise moment is equal to anti-clockwise moment
Moment Is the produce of force and perpendicular distance.
M = F×r
So,
WL•Cos50 × 4 + Wf•Cos50 × 6.3 —N₁•Sin50 × 8 = 0
355•Cos50 × 4 + 870•Cos50 × 6.3 =
N₁•Sin50 × 8
1825.52 + 3523.12 = 6.13N₁
6.13N₁ = 5348.64
N₁ = 5348.64/6.13
N₁ = 872.54 N.
The normal force exerted by the wall is 872.54N
Related Questions
A 1.31 kg flower pot falls from a window. What is the momentum of the pot when it
has fallen far enough to have a velocity of 2.86m/s?
00.458 kgm/s
06.35 kgm/s
O 3.75 kgm/s
02.18 kgm/s
Answers
the answer is 3.75 kgm/s
Momentum= mass x distance
1.31 x 2.86= 0.375kgm/s
True or false? An apple, potato, and onion all taste the same if you eat them with your nose plugged
Answers
Answer:
True!
Explanation:
Apples, potatoes and onions will all taste the same if somehow you were to block your sense of smell (plug your nose).
A 12-kg bowling ball is rolled toward a stationary, 0.9-kg bowling pin at 2.4m/s to the right. After the collision, the bowling ball continues to move in the same direction at 1.3m/s.
Determine the final velocity of the bowling pin.
Answers
Answer:
14.6m/s
Explanation:
elastic collision formula
mv1+mv2=mv1'+mv2'
mv1= mass times velocity of the first object
mv2= mass times velocity of the second object
mv1'=mass times velocity of the first object after the collision
mv2= mass times velocity of the second object after the collision.
we know that the pin is not moving so we multiply 0 or its velocity by the mass 0.9kg this equals zero so we don't add this part to the equation.
mv1=mv1'+mv2'
plugin the values and solve using order of operations
12kg(2.4m/s)=12kg(1.3m/s)+0.9kg(v2')
28.8kg.m/s=15.6kg.m/s+0.9kg(v2')
at this point you need to move 15.6kg.m/s to the other side of the equation so subtract 15.6kg.m/s to 28.8kg.m/s
28.8kg.m/s=15.6kg.m/s+0.9kg(v2')
28.8kg.m/s - 15.6kg.m/s= 0.9kg(v2')
finally Divide by 0.9kg in order to leave v2' in one side.
13.2kg.m/s=0.9kg(v2')
13.2kg.m/s÷0.9kg=v2'
14.6kg.m/s=v2'
A flask that weighs 345.8 g is filled with 225 mL of carbon tetrachloride. The weight of the flask and carbon tetrachloride is found to be 703.55 g. From this information, calculate the density of carbon tetrachloride.
Answers
Answer:
Well, I think the best answer will be is 1.59 g/mL Good Luck!
The density of carbon tetrachloride in the flask is calculated by subtracting the weight of the empty flask from the total weight to get the weight of the carbon tetrachloride. Then, use the formula density = mass/volume, which results to 1.589 g/mL.
Explanation:To calculate the density of carbon tetrachloride in the flask, first determine the weight of the carbon tetrachloride by subtracting the weight of the empty flask from the total weight. So, 703.55 g (the total weight) - 345.8 g (the weight of the flask) = 357.75 g (weight of carbon tetrachloride).
Next, we use the formula for density which is: density = mass/volume. Our mass (weight of carbon tetrachloride) is 357.75 g and our volume is 225 ml. Therefore, the density of carbon tetrachloride is 357.75 g / 225 ml = 1.589 g/mL.
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The work done by a force is greatest when the force and the displacement vectors are ________.
A.perpendicular
B.parallel
C.equal
D.balanced PLEASE HELP!!!!!!!!!
Answers
The diagra shows molecules in a fluid. Explain the
sequence of events that happens when this fluid cools down. Be sure to focus on what happens to the
molecules and to the fluid in general. Five events
should be included in your answer.
Answers
Answer:
Check below for the answers and explanations.
Explanation:
Note: You did not provide the diagram you mentioned but I will explain to you the sequence of events that take place as a fluid cools. I believe you can apply this to the particular diagram that you have.
Sequence of events that take place as a fluid cools down:
There is a reduction in the temperature of the fluidThe speed of movement of the molecules will reduceSince there is a reduction in speed, the Kinetic Energy also reduces. KE = 1/2 mv²The density of the fluid will increase as the temperature decreasesThe molecules will be closer to each other as opposed to in a gas where there is collision of moleculesThe sequence of events that occur when a fluid cools down are;
The temperature of the liquid will drop
When the temperature drops, the molecules will move more slowly.As a result of this decrease in velocity, the kinetic energy of the molecules will also decrease.As the temperature of the fluid decreases, the density of the liquid increases accordingly.The liquid molecules will draw closer together and intermolecular forces will become more significant.Liquid moleculesWe have to note that according to the kinetic theory of matter, the molecules of a liquid are in constant random motion. The kinetic energy of these molecules depend on the temperature of the liquid.
The five sequence of event that happens as liquid molecules cool down are;
The temperature of the liquid will dropWhen the temperature drops, the molecules will move more slowly.As a result of this decrease in velocity, the kinetic energy of the molecules will also decrease.As the temperature of the fluid decreases, the density of the liquid increases accordingly.The liquid molecules will draw closer together and intermolecular forces will become more significant.Learn more about liquid molecules: https://brainly.com/question/25667812
All of the following are common symptoms of all dissociative disorders except
A. wandering away from home
B. mental health problems
C. feelings of detachment
D. a blurred sense of identity
Answers
All of the following are common symptoms of all dissociative disorders except wandering away from home.
Dissociative disorder, or dissociative identity disorder, is a psychological disorder in which a person has changes in consciousness, memory, identity, emotion, perception of the environment, control of movements and behavior, which can happen after traumatic or high-stress events.
What types of dissociative disorder?Overview of dissociative disorders.
Depersonalization/derealization disorder.Dissociative amnesia.Dissociative identity disorder.See more about dissociative disorders at brainly.com/question/4566966
12 g of coal contains approximately 6 × 1023 atoms of carbon.
How many atoms would be in 1 kg of carbon?
Show your working.
Answers
Answer:
5*10^25 atoms of carbon
Explanation:
Check from the periodic table:
M(carbon) = 12.01 g/mol
Convert kg into g:
1 kg = 1000 g
Calculate the number of moles of carbon:
n(carbon) = (1000 g) ÷ (12.01 g/mol) = 83.26 mol
Convert moles into number of particles:
#(carbon) = n × NA = 83.26 mol × 6*10^23
= 5*10^25 particles
Note: NA represents the Avogadro's Number, which has the value 6.02*10^23 particles/mol.
This type of telescope uses a lens to collect
light.
Answers
Answer: optical telescope.
Use the drop down menus to identify the parts of the diagram labeled a b and c
Answers
Answer: your welcome
Explanation:
Answer:
a: river
B: tributary
Explanation:
Light includes which of the following?
A.Radio waves and microwaves
B.Visible light
C.X-rays and gamma rays
D.All of the above
Answers
Answer:
Light includes ALL of these answers: Radio/Microwaves. Visible light and X-rays/Gamma rays.
A pendulum completes 30 cycles every minute. What is the frequency of the pendulum?
Answers
For this case we have that by definition, the frequency is given by the number of cycles that are formed in a second.
According to the statement we have:
Cycles: 30
Time: 1 minute = 60 seconds
Thus, the frequency is:
[tex]f = \frac {30} {60} = \frac {3} {6} = \frac {1} {2} = 0.5[/tex]
Thus, the frequency of the pendulum is[tex]0.5 \ Hz[/tex]
Answer:
[tex]0.5 \ Hz[/tex]
When two ions with the same charge come together, their electric fields will
A. bend towards each other
B. bend away from each other
C. nothing will happen
Answers
Answer:
B. Bend away from each other
Explanation:
What kind of wave is this?
Answers
Answer:
I think its transverse
Explanation:
How do you find the volume of a cone with a height of 27 cm and a radius of 13 cm?
Answers
Answer:
1521π cm³
Explanation:
V = π·r²·h/3
= π·13²·27/3
= π·169·9
= 1521π cm³
A 60 W bulb is left on from 8:00 a.m. to 3:00 p.m. Calculate the energy usage of the bulb.
kWh
Answers
Answer:
.42
Explanation:
Answer:
0.42
Explanation:
what are mechanical waves?
Answers
Answer:
A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far from its initial equilibrium position.
Explanation:
Which sample has the lowest temperature?
Answers
Sample C has the lowest kinetic energy value and, assuming the same conditions for all samples, it would also have the lowest temperature. Therefore, option C is correct
The image contains a list of samples with their corresponding average kinetic energies of molecules in joules. To determine which sample has the lowest temperature, we would need to apply the principle that, at a given temperature, the average kinetic energy of molecules is proportional to the temperature itself. This is described by the equation:
[tex]\[ KE_{avg} = \frac{3}{2} k T \][/tex]
where [tex]\( KE_{avg} \)[/tex] is the average kinetic energy, [tex]\( k \)[/tex] is the Boltzmann constant [tex](\(1.38 \times 10^{-23} \text{ J/K} \))[/tex], and [tex]\( T \)[/tex] is the temperature in kelvins.
However, without additional information about the specific gases or the number of molecules involved, we cannot calculate the exact temperature from the average kinetic energy. Typically, the kinetic energy of a sample is directly proportional to its temperature (in an ideal gas scenario). Therefore, the sample with the lowest average kinetic energy would also have the lowest temperature.
Based on the average kinetic energy values provided in the image, we can conclude that:
- Sample A has [tex]\( 1.50 \times 10^4 \)[/tex] J
- Sample B has [tex]\( 1.73 \times 10^5 \)[/tex] J
- Sample C has [tex]\( 2.73 \times 10^3 \)[/tex] J
- Sample D has [tex]\( 5.06 \times 10^4 \)[/tex] J
Sample C has the lowest kinetic energy value and, assuming the same conditions for all samples, it would also have the lowest temperature.
please help me asap!!!!!!!
Answers
Answer:
you should have given the passage too bt i think option b is correct..
When two waves having displacements in opposite directions meet, _______________ occurs.
A, complete cancellation
B, destructive interference
c, constructive interference
D, no interference
Answers
Answer: D
Explanation:
Answer:
the answer is b
Explanation:
when there going against each other it would have to break, I hope this helps.
A series circuit has a current of 5 A. The circuit contains 10ohms resistor. What is the voltage of the circuit
Answers
Answer:
50 Volts
Explanation:
Using Ohm's Law
V= I x R
V= 5 x 10
V = 50 V
Which term refers to the bending of light rays when they encounter the edge of a barrier?
A
interference
B
reflection
C
refraction
D
diffraction
Answers
Answer: Refracrion
Explanation: it is the bending of light
What is the difference between negative and positive acceleration?
Answers
Answer: Positive acceleration means increase in velocity with time. Negative acceleration means the speed reduces with the time.
two +1C charges are separated by 3000m. What is the magnitude of the electric force between them?
Answers
Answer:
1000 N
Explanation:
The Electric Force between two charged particles with charges q1 and q2 respectively, separated by a distance, d, is given as:
F = (k * q1 * q2) / d²
Where k = Coulombs constant
From the question:
Charge of first particle = charge of second particle = q = +1 C
Distance between both particles, d = 3000 m
Therefore, Electric Force is:
F = (9 * 10^9 * 1 * 1) / (3000²)
F = (9 * 10^9) / (9 * 10^6)
F = 1 * 10^3 N = 1000 N
The electric force between both charges is 1000 N.
Answer:
1000 N
Explanation:
The electric force between two charges is given as
F = kq'q/r²......................... Equation 1
Where F = electric force between the charges, q' = magnitude of the first charge, q = magnitude of the second charge, r = distance between the charges, k = coulombs constant
Given: q' = q = 1 C, r = 3000 m, k = 9×10⁹ Nm²/kg²
Substitute into equation 2
F = 1²×(9×10⁹)/3000²
F = 1000 N.
Hence the magnitude of the electric force between them = 1000 N
What is the wavelength in nm of a light whose first order bright band forms a
diffraction angle of 30 degrees, and the diffraction grating has 700 lines per
mm? (give answer in whole number format) *
Answers
The wavelength of the first order bright band light light is 714 nm .
Explanation:
We have to find the wavelength of the first order brightness of a light. Here we are using Huygen's principle of light.
The formula is
nλ =d sinθ
where, n is the order of maximum
λ is the wavelength of light
d is the distance between the lines on diffraction grating.
θ is the angle.
For the given equation n is 1 because the problem states that the light forms 1st order bright band
λ is unknown.
d = [tex]\frac{1}{700,000}[/tex] or 0.0000014 m
sin (30) = 0.5
so,
1(λ) = (0.0000014)(0.5)
= 0.0000000714
= 714 nm
Thus, The wavelength of the first order bright band light light is 714 nm .
Which of the following is not a practical application of gravity?
O
A. It keeps the moon in orbit around Earth.
O
B. The moon has no gravity because it has no atmosphere.
O
C. It keeps the galaxies from flying apart.
O
D. It keeps Earth in orbit around the sun.
Answers
The option which is not practical application of gravity is The moon has no gravity because it has no atmosphere. The correct option is option B.
Practical application of gravityPractical Application of gravity is the use of gravity in ways that beneficial to man and earth. Gravity is one of the most important physical features of the earth and major contribution to our existence.
Examples of practical application of gravity
Gravity keeps the Earth orbiting around the Sun.Gravity keeps people on the Earth's surfaceGravity holds the feet down.Gravity holds the air down.Learn more about importance of gravity here
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We saw this image on the Physics Classroom. Maybe you have experienced this
with a slinky, or perhaps with a jump rope or thick string. Explain what you see or
may have seen or experienced if you move the slinky left to right, as compared
to up and down:
SEREBRNI KODINKO RESSORTU VODUSE Scored
Sliky waves can be made by vibrating
the first coil back and forth in either
a horizontal or a vertical direction.
Answers
Answer:
The left to right motion causes a pulse in the coils and it doesn't look like the wave is moving but it is a longitudinal wave. Moving it side to side causes a "snake like" motion of the slinky, which is a transverse wave
Explanation:
Which object would require the most amount of energy, or force, to set it into motion?
A. a school bus
B. a refrigerator
C. a microwave
D. a houseplant
Answers
Answer:
The answer is A
Explanation:
The school bus has the most mass so it would need the most energy and force to set it into motion
hope this helps ;)
A. a school bus is the object that would require the most amount of energy, or force, to set it into motion.
Force is equal to mass multiplied by acceleration. A refrigerator, a microwave, and a houseplant can be moved easily from one place to another using wheels to displace an object from one place to another. But the mass of a school bus is more than any of the options given if even it runs on wheels a more force is required to be used to set the school bus in motion.Hence, A. school bus is the correct option.
Learn more about force:
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The total thermal energy needed to raise the temperature of this ice cube to 0.0 °C and completely melt the ice cube is 5848 J
specific latent heat of fusion of ice = 334 000 J/kg
Calculate the mass of the ice cube.
Answers
Answer:
0.018kg
Explanation:
Q=mlf
m=?,Lf=334000J/kg,Q=5848J
5848=mx334000
5848=334000m
divide both sides by 334000
334000m/334000=5848/334000
m=0.018kg
As the ice melts into liquid water, what happens to the kinetic energy of the particles in the sample?
Answers
Answer:
it goes down
Explanation:
Answer:
The kinetic energy of the particles are being reduced.