Answers
Given:
Different kinds of forces
To find:
Identify the contact forces and non-contact forces
Explanation:
A force that acts between two surfaces in contact is a contact force, while the force that acts between the two surfaces, not in contact, is a non-contact force.
The contact forces here are:
Sitting on a chair (friction)
Skateboard slows down on a rough surface (friction)
Slamming the door (friction)
Non-contact forces:
Magnet attracting paper clips (magnetic force)
Two like charges repel each other (electrostatic force)
When A peach falls from a tree (gravitational force)
Related Questions
The mass of 12 protons is approximately equal to ?
1 atomic mass unit
12 atomic mass units
The mass of 1 electron
The mass of 12 electrons
Answers
Answer:
Option 1, 1 atomic mass unit
Ohr's law describes the relationship between voltage, current, and
resistance. Which of the following equations represents Ohm's law?
O A V=I+R
B. V-R
C. V-IR
ODVEA
R
Answers
Which type of force describes the force applied to an object?
(10 Points)
Normal Force
Force of Gravity
Applied Force
Force of Friction
Tension Force
Plssss help!!!!
Answers
Answer: Force of Gravity
Explanation:
Because if a force is applied to an object then the force of gravity will move the object.
Hope this helps you!
A thin rod extends from
x = 0
to
x = 15.0 cm.
It has a cross-sectional area
A = 8.00 cm2,
and its density increases uniformly in the positive x-direction from 2.50 g/cm3 at one endpoint to 19.5 g/cm3 at the other.
(a)
The density as a function of distance for the rod is given by
= B + Cx,
where B and C are constants. What are the values of B (in g/cm3) and C (in g/cm4)?
B =
g/cm3
C =
g/cm4
(b)
Finding the total mass of the rod requires integrating the density function over the entire length of the rod. The integral is written as follows.
m =
allmaterial
dv =
all x
A dx =
15.0 cm
0
(B + Cx)(8.00 cm2) dx
What is the total mass of the rod (in kg)?
kg
Answers
(a) For the density function, the value of B is 2.5 g/cm³ and the value of C is 1.3 g/cm⁴
(b) The total mass of the rod is 1470 g.
What is the density function?The density of the rod is a function of distance and it is given as;
ρ = B + Cx
where;
B and C are constantsρ = 2.5 g/cm³ + (19.5 g/cm³ ) / ( 15 cm ) x
ρ = 2.5 g/cm³ + 1.3 g/cm⁴ x
The total mass of the rod is calculated by integrating the function;
dm = ( B + Cx)(8 cm² ) dx
m = 8B + 8Cx
m = 8Bx + 8Cx² / 2
m = ( 8 x 2.5 x 15 ) + ( 8 x 1.3 x 15² ) / 2
m = 1470 g
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.......................................
.
Answers
Explanation:
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True or False: The basketball should be dribbled below the waist.
Answers
What is the intensity of a sound wave with a relative intensity of 13.7 dB?
Answers
The intensity of a sound wave with a relative intensity of 13.7 dB is 5.01×10¹³w/m²(option -b).
How does the relative intensity of waves operate?The "decibel level" of a sound is a less formal term for the relative intensity level. Relative intensity level differs from intensity in that it employs a logarithmic scale to more closely resemble how people perceive loudness.
Given,
The relative intensity of the sound wave= 13.7dB.
To calculate the intensity of the sound wave, we will use the formula provided by.
B = log₁₀I/I₀
When we factor the value of B into the previously mentioned relation and solve for I/I0, we get:
13.7dB = 10×log₁₀I/I₀
solving,
I/I₀ = \(10^{13.7}\)
I/I₀ = 5.01×10¹³w/m².
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The uniform beam has a weight W and length L and is supported by a pin at A and cable BC ( figure 1)
Part A
Determine the horizontal and vertical components of reaction at A
Express your answers in terms of some or all of the variables W, R. Φ and θ). Enter your answers separated by a comma.
View Available Hint's)
Aa + Ay = ____
Parts B
Determine the one cable car necessary to hold the beans position shown
Express your answers in terms of some or all of the variables W, R. Φ and θ).
Answers
The reaction is in A in vertical direction is W(2cosϕsinθ−sinϕcosθ)/2sin(θ−ϕ).
What is Normal Stress and Strain?In terms of psychology, "stress" and "strain" are sometimes used interchangeably in popular culture, as in the expressions "I'm feeling stressed" or "I'm under a lot of pressure."
In engineering, these phrases have specific, technical meanings. If a hook in the steel wire is attached,
If you hang the wire from the ceiling while placing a weight on the lower end, it will sag. By dividing the length change by the starting length, the strain in the wire may be computed.
Thus, as per the given scenario, W(2cosϕsinθ−sinϕcosθ)/2sin(θ−ϕ) will be the equation.
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What would the position of arrows on a target need to be to illustrate measurements that are neither accurate nor precise
Answers
Answer:
The position of the arrows will not be on the target i.e. outside the bull's eye, neither will they be close to one another (widely scattered).
Explanation:
Accuracy refers to the closeness of a measurement to an actual or accepted value while precision refers to the closeness of measurements to one another.
Using archery as an illustration of precision and accuracy, measurements (arrows) that are neither accurate not precise are those arrows that will be far away or outside the bull's eye region (target) of the board and also far apart from one another.
In a nutshell, the arrows will be distant from the bull's eye or target (not accurate) and also distant from one another (not precise).
Problem B.2: Escaping a Star (6 Points) It takes many years for a photon produced in a star's centre to reach its surface and escape into space. This is due to its constant interaction with other particles. To estimate the time it takes for a photon to escape a star's interior, we assume that the photon is deflected in equal time intervals into a random direction in a two-dimensional space (i.e., a random walk): At each step i, the photon moves a constant distance in an angle, thus changing its position: cos(4) sin(y) Ai, - c (a) Determine the distance R(n) from the centre (0,0) after n steps.
Answers
Answer:
This problem involves the concept of a random walk, which is a mathematical model of a path consisting of a succession of random steps.
The question asks for the distance, R(n), from the center of a star after n steps of a photon, assuming a 2D random walk.
The random walk in two dimensions has a step length of A_i and the direction of the steps is uniformly distributed in [0, 2π). The change in position after each step can be written in Cartesian coordinates (Δx, Δy), where Δx = A_i cos(θ_i) and Δy = A_i sin(θ_i).
The displacement from the center after n steps is given by the vector sum of all the individual steps. This vector sum can be written in terms of its Cartesian coordinates, (X, Y), where X = Σ Δx and Y = Σ Δy. This sum over n random vectors is itself a random variable. The net displacement R(n) from the center of the star after n steps is given by the magnitude of the net displacement vector:
R(n) = √(X² + Y²)
Because each step is independent and has a random direction, the expected value of the cosine and sine for any step is zero. This means that the expected values of X and Y are both zero.
However, the mean square displacement is not zero. Because the steps are independent, the mean square displacement in each direction is additive. For a 2D random walk:
<X²> = Σ <(Δx)²> = n <(A cos θ)²> = n A²/2
<Y²> = Σ <(Δy)²> = n <(A sin θ)²> = n A²/2
Because <X²> = <Y²>, we can write:
<R²> = <X²> + <Y²> = n A²
So, the root mean square distance (the square root of the mean square displacement) after n steps is:
R(n) = √(<R²>) = √(n) * A
Therefore, the distance R(n) that the photon is expected to be from the center of the star after n steps grows as the square root of the number of steps, with each step having a length A. Please note that this result holds for a 2D random walk. A real photon in a star would be performing a 3D random walk, which would have slightly different characteristics.
Imagine a table that has a hole drilled through the center. Through this hole is a string that connects one mass that hangs under the table, to a mass that is on top of the table and spinning. mass M weighs 10kg, mass m weighs 5 kg, and the radius, R, of the circle mass M, traces out is 50cm.
1. Solve for Force centripetal
2. At what speed does the mass M need to rotate in order to keep mass m suspended
Answers
Answer: The speed at which mass M needs to rotate in order to keep mass m suspended is 0.7071067811865475 m/s.
Explanation:
In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force?
Answers
Answer: W.D = 1/2mv^2
Explanation:
If an external force or a single force is acting on a body. Just like the first law of thermodynamics, the force acting on the body will cause work done on the system.
Work done = force × distance
And the work done on the body will cause the molecules of the body to experience motion and thereby producing kinetic energy.
The work done will be converted to kinetic energy.
W.D = 1/2mv^2
How can you tell how objects differ in density?
Answers
Answer:
You have to compare the densities,
Explanation:
To find density:
1. Measure the object's weight
2. Divide the mass by the volume
what factors affect potential energy
Answers
A crate of mass
m = 26 kg
rides on the bed of a truck attached by a cord to the back of the cab as in the figure below. The cord can withstand a maximum tension of 69 N before breaking. Neglecting friction between the crate and truck bed, find the maximum acceleration the truck can have before the cord breaks. (Enter the magnitude of the maximum acceleration in the forward direction.)
m/s2
Answers
Answer:
Explanation:
The maximum tension the cord can withstand is 69 N, so we know that the tension in the cord cannot exceed this value. The tension in the cord is related to the acceleration of the truck through Newton's second law:
ΣF = ma
where ΣF is the net force on the crate, m is the mass of the crate, and a is the acceleration of the truck.
In this case, the only force acting on the crate in the horizontal direction is the tension in the cord. Therefore, we can write:
ΣF = T = ma
where T is the tension in the cord.
We can solve this equation for the acceleration:
a = T/m
We know that the tension cannot exceed 69 N, so the maximum acceleration the truck can have before the cord breaks is:
a = 69 N / 26 kg
a ≈ 2.65 m/s^2
Therefore, the maximum acceleration the truck can have before the cord breaks is 2.65 m/s^2.
What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 580 nm
Answers
Answer:
Explanation:
In case of soap film , light gets reflected from denser medium , hence interference takes place between two waves , one reflected from upper and second from lower surface . For destructive interference the condition is
2μt = nλ where μ is refractive index of water , t is thickness , λ is wavelength of light and n is an integer .
2 x 1.34 x t = 1 x 580
t = 216.42 nm .
Thickness must be 216.42 nm .
what is the pressure of a tank of uniform cross sectional area 4.0m2 when the tank is filled with water a depth of 6m when given that 1 atm=1.013 x 10^5pa density of water=1000kgm-3 g=9.8m/s2
Answers
The pressure of the tank, when filled with water at a depth of 6 m, is approximately 580.124 atmospheres (atm). To calculate the pressure of the tank, one can use the equation: Pressure (P) = Density (ρ) × g × Depth (h)
Pressure (P) = Density (ρ) × g × Depth (h)
Given: Density of water (ρ) = 1000 kg/m³
Acceleration due to gravity (g) = 9.8 m/s²
Depth (h) = 6 m
Using the given values, one can calculate the pressure:
Pressure = 1000 kg/m³ × 9.8 m/s² × 6 m Pressure
= 58800 kg·m⁻¹·s⁻²
Now, let's convert the units to pascals (Pa) using the conversion 1 atm = 1.013 x \(10^5\) Pa:
Pressure = 58800 kg·m⁻¹·s⁻² × (1 atm / 1.013 x\(10^5\) Pa)
Pressure = 580.124 atm
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A train travels 8.81 m/s in a -51.0° direction.
The train accelerates for 2.23 s, changing its
velocity to 9.66 m/s in a 37.0° direction.
What is [delta]x?
Answers
The displacement of the train after 2.23 seconds is 25.4 m.
Resultant velocity of the trainThe resultant velocity of the train is calculated as follows;
R² = vi² + vf² - 2vivf cos(θ)
where;
θ is the angle between the velocity = (90 - 51) + 37 = 76⁰R² = 8.81² + 9.66² - 2(8.81 x 9.66) cos(76)
R² = 129.75
R = √129.75
R = 11.39 m/s
Displacement of the trainThe displacement of the train is the change in position of the train after a given period of time.
The displacement is calculated as follows;
Δx = vt
Δx = 11.39 m/s x 2.23 s
Δx = 25.4 m
Thus, the displacement of the train after 2.23 seconds is 25.4 m.
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8. Main Idea How do animals reproduce?
Answers
Answer: Many multicellular animals like fishes, mammals, birds, etc. reproduce through sexual reproduction process. Even reproduction in domestic animals also occurs through the sexual process. Domestic animals (pets or farm animals) are an essential part of our life. MARK AS BRAINLIST PLZ
Explanation:
A toy car rolls down a ramp, even absence of non-conservative forces, it's
not possible for all of it's potential energy to convert into kinetic energy.
What is moving, within the car-system itself, that is also gaining energy
in order for this part of the car to move? How is this responsible for
consuming some of the mechanical energy?
Answers
Answer:
Hello i hope this helps you! Potential and Kinetic EnergyHold the car at the top of the ramp, and release to demonstrate the two main kinds of energy. Potential energy is placed into the car when it's lifted from the floor, and that energy is released as the car rolls down the ramp.
Explanation:
hope this helps
Given that the luminosity of a star is given as a function of its radius and temperature by the equation. I do not understand this last question in terms of what to put into the given equation.
Answers
The luminosity of this star in units of the solar luminosity would be: 483.7L.
How to calculate the luminosityTo calculate the luminosity, we would use the different values given and the formula for luminosity.
Temperature = 9305K
Star's radius = \(5.90 * 10^{9} m\\\)
Luminoisty of the star
Luminosity of the sun
= \(\frac{4π * (5.90 * 10^9)^2 * 5.67 * 10^-8 * 9305^4 W}{3.846 * 10^26 W}\)
= 483.7L
This is the unit for luminosity.
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water flows down from a spillway apron in a 2 ft wide rectangular channel at a rate of 10 ft3/s. the downstream water depth (y2) of a hydraulic jump is observed as 2.5 ft. select the correct statement.
Answers
The velocity is 2H/Sec, headed loss is 5.14H, water depth upstream is 0.228 H.
What is velocity?
The velocity of an object is the most crucial factor in establishing its location and rate of motion. It may be defined as the distance that an object covers in a specific length of time. Velocity is the measure of an object's movement over time.
What is hydraulic ?
Field of science focused on using fluids, usually liquids, in motion for practical purposes. It is connected to fluid mechanics, which serves as the theoretical underpinning for much of it.
wide B= 2H
Flow rate Q= 10H³/sec
Depth downstream y₂= 2.5H
velocity of downstream Q/BY₂= 10/2*2.5
=2H/Sec
Frauded number for downstream fr₂ = v₂/\(\sqrt{gr2}\)
=2/\(\sqrt{32.2*2.5}\)
=0.223
water depth upstream
y₁= y₂/2[\(\sqrt{1+8fr2-1}\)]
=3.5/2 [\(\sqrt{1+fr2*1.8*0.233}\)]
=0.228 H
Velocity of upstream v₁= Q/BY₁= 10/ 2*0.288
Frauded number = V₁/\(\sqrt{gr2}\) = 21.96/\(\sqrt{30.2*0.200}\)
=8.09
headed loss hl= (v₂-v₁)²
= (2.5-0.228)³
=5.14H
Therefore, velocity is 2H/Sec, headed loss is 5.14H, water depth upstream is 0.228 H.
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Question 4
10 pts
Que
A ping pong ball is thrown straight up into the air and has an initial velocity of 20.5 m/s.
Determine the peak height to which the ping pong ball rises.
Time Runnir
Attempt due:
30 Minutes
O 21 m
O 1 m
O 43 m
O Om
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Next
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Submit Ouiz
Answers
Answer:
I have no clue what this means or what the answer is i am just trying to get my points up so i can ask questions
Explanation:
i am going to put something here so it looks like an explanation so yeah this has no meaning whatsoever i am very sorry that i am not able to give you the answer try looking the answer up im very very very very sorry :(
What is the mass of a bullet in free fall with a force of 300N?
Answers
A woman pulls a 7.87 kg suitcase,
initially at rest, with a 29.2 N force
along the handle at 62.7° Friction
pulls back at 11.7 N, and the
suitcase moves 8.44 m. What is
the total work done?
(Unit = J)
Answers
Answer:
Effective Pulling Force = 29.2(cos 62.7°) = 13.393 N
Resistance to Pulling Force = 11.7 N
Net Force acting on suitcase = 13.393 - 11.7 = 1.693 N
Distance moved = 8.44 m
Net Work = 1.693(8.44) = 14.289 ≈ 14.3 J ANS
Explanation:
hope that makes sense homie
Answer:
14.3
Explanation:
right answer for acellus
what type of amplifier is depicted? b) for an ideal amplifier, what is the input resistance for vin, a ? c) show explicitly how vout is related to vin,a and vin,b.
Answers
There are 4 fundamental types of amplifiers, though they are categorized based on input and output parameters such as, current, voltage, trans conductor and trans resistance amplifier .
An amplifier that increases the input current is known as a "current amplifier." It has a low input impedance and a high output impedance.An amplifier that amplifies a given voltage for a higher voltage output is referred to as a voltage amplifier. It has a high input impedance and a low output impedance.Trans conductance amplifier, an amplifier whose output current fluctuates in response to input voltage variations.An amplifier that alters output voltage in response to altering input current is known as a trans resistance amplifier. It is sometimes referred to as a converter of current to voltage.To provide the greatest amplified voltage gain, the input resistance must be infinite and the output resistance must be zero. Practically speaking, however, it can be deduced that the voltage amplifier must have a high input resistance and a low output resistance.
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Using atleast 4 sentences. Please share three facts you have learned this year in Physical Education and how you will adapt what you have learned to your everyday life.
Answers
Three facts I have learned this year in Physical Education are:
a) The importance of stretching before and after exercising.
b) The benefits of cardiovascular exercise.
c) The importance of staying hydrated during exercise.
Firstly, I have learned the importance of stretching before and after exercising. Stretching helps prevent injury and improves flexibility. I will make sure to incorporate stretching into my daily routine, whether it's through a short stretching session in the morning or by taking a few minutes to stretch before and after a workout.
Secondly, I have learned the benefits of cardiovascular exercise. Cardiovascular exercise, such as running or cycling, helps improve heart health and endurance. I will try to incorporate more cardiovascular exercise into my daily routine, such as going for a run or bike ride after work.
Lastly, I have learned the importance of staying hydrated during exercise. Dehydration can lead to fatigue and muscle cramps, so it's important to drink plenty of water before, during, and after exercise. I will make sure to carry a water bottle with me throughout the day and refill it regularly to ensure that I am staying hydrated.
In summary, by incorporating stretching, cardiovascular exercise, and staying hydrated into my daily routine, I hope to improve my overall physical health and well-being.
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A bicyclist was moving at a rate of 3 m/s, and then sped up to 4 m/s. If the cyclist has a mass of 100 kg, how much work was needed to increase his velocity? (Hint: Use the work-kinetic energy theorem.) O A. 1250 J B. 450 J O c. 350 j D. 800 J
Answers
Answer:
i got b but urs is a little different tell me if right
Explanation:
i go 100 on my test
A tennis ball and a bag filled with sand have the same mass. They are dropped from the same height and they hit the ground. The bag of sand stays on the ground, while the tennis ball rebounds. Which experiences the larger impulse from the ground?
Answers
Answer:
The bag of sand
Explanation:
I think it is the bag of sand because according to the definition of impulse, impulse is the average force acting on a particule when an external force is being acted on it.
What characteristics determine how easily two substances change temperature? Check all that apply.
volume of the two substances in contact
amount of time the two substances are in contact
Oarea in contact between the two substances
specific heat of the material that makes up the substances
density of the two substances in contact
Answers
Answer:
The characteristics that determine how easily two substances change temperature are:
specific heat of the material that makes up the substancesarea in contact between the two substancesThe volume and density of the substances and the amount of time they are in contact do not directly affect how easily they change temperature.
Explanation: