The child's resultant velocity is 21.3 m/s.
Explanation:The resultant velocity of the child can be determined by subtracting the child's velocity from the velocity of the bus. In this case, the child is walking towards the back of the bus, so their velocity is negative. Therefore, the resultant velocity of the child is:
https://brainly.com/question/29136833
#SPJ2
When two waves having displacements in opposite directions meet, _______________ occurs.
A, complete cancellation
B, destructive interference
c, constructive interference
D, no interference
Answer: D
Explanation:
Answer:
the answer is b
Explanation:
when there going against each other it would have to break, I hope this helps.
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.
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
Controlling voluntary skeletal muscles is a function of the __________ nervous system.
A.
sympathetic
B.
somatic
C.
autonomic
D.
central
Please select the best answer from the choices provided
A
B
C
D
Answer:
Your answer is SOMATIC :)
The somatic nervous system is the part of the peripheral nervous system associated with the voluntary control of body movements and skeletal muscles.
The voluntary skeletal muscles that should be controlled represent the function of the somatic nervous system.
What is the somatic nervous system?The somatic nervous system refers to the system where it is the portion of the nervous system i.e. peripheral and should be associated with the controlling of the movement of the bonds through the skeletal muscles usage. Therefore, we can say that the option b is correct.
And, the rest of the options are wrong.
Learn more about muscles here: https://brainly.com/question/2687783
List at least five examples of minerals and their common uses.
Answer:
Gold
mica
halite
gypsum
copper
Explanation:
Gold:it is used in dentistry
mica: its is used in putting sparkle in rock
halite:its used in seasoning food and softening water
gypsum: it is used as fertilizer and road construction
copper: it is used for jewelry and currency
PLEASE HELP!!! 25 pts!!
to calculate the velocity of an object the_____of the position versus time graph should be calculated.
Answer:
The slope of the graph is what you need. That tells you the speed not the velocity. In order to find the velocity you would also need to know the direction of the motion.
Answer:
Slope
Explanation:
Rise over Run
What kind of wave is this?
Answer:
I think its transverse
Explanation:
Which sample has the lowest temperature?
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.
two +1C charges are separated by 3000m. What is the magnitude of the electric force between them?
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
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
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:
https://brainly.com/question/13191643
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.
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
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
Answer:
B. Bend away from each other
Explanation:
A pendulum completes 30 cycles every minute. What is the frequency of the pendulum?
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]
What is the difference between negative and positive acceleration?
Answer: Positive acceleration means increase in velocity with time. Negative acceleration means the speed reduces with the time.
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
Answer:
Light includes ALL of these answers: Radio/Microwaves. Visible light and X-rays/Gamma rays.
12 g of coal contains approximately 6 × 1023 atoms of carbon.
How many atoms would be in 1 kg of carbon?
Show your working.
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.
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
Answer: Refracrion
Explanation: it is the bending of light
what are mechanical waves?
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:
WILL GIVE BRAINLIEST AND 30 POINTS!
What is the magnitude of a nanometer?
10–3 m
10–6 m
10–9 m
10–12 m
The magnitude would be 10-9m
Based on scientific information and records, the magnitude of a nanometer is equal to: C. 10⁻⁹ m.
What is measurement?Measurement refers to a process through which the size, magnitude or other physical quantities associated with an object is taken, especially for the purpose of a scientific research (experiment).
What is a nanometer?In the metric system, a nanometer can be defined as a measure of length such as:
Wavelengths of light.Distances between atoms of a molecule.In conclusion, a nanometer is one billionth (10⁻⁹ m) of a meter.
Read more on a nanometer here: https://brainly.com/question/5753030
#SPJ2
Use the drop down menus to identify the parts of the diagram labeled a b and c
Answer: your welcome
Explanation:
Answer:
a: river
B: tributary
Explanation:
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) *
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 represents potential energy?
A) bread baking
B) lawnmower cutting grass
C) car racing downhill
D) weed whacker full of gas
Answer:
D) Weed whacker full of grass
Explanation: Its D) because the weed wacker full of grass is stil and not moving therefore making it potential energy.
According to Newton's first law of motion, what would happen to a car traveling at a constant velocity of 55 MPH to the west in the absence of an unbalanced force?
Explanation:
Newton's first law of motion says that an object will be at rest or it will be in motion until an unbalanced force acts on it.In this case, a car traveling at a constant velocity of 55 mph to the west in the absence of an unbalanced force.It would mean that the car will continue to move with a constant velocity of 55 mph to the west due to Newton's first law of motion.This type of telescope uses a lens to collect
light.
Answer: optical telescope.
True or false? An apple, potato, and onion all taste the same if you eat them with your nose plugged
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).
As the ice melts into liquid water, what happens to the kinetic energy of the particles in the sample?
Answer:
it goes down
Explanation:
Answer:
The kinetic energy of the particles are being reduced.
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.
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
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!!!!!!!!!
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.
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
https://brainly.in/question/5046226
#SPJ1
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.
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:
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
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