The coefficient of kinetic friction between the box and the floor is 0.11.
What is coefficient of friction?Coefficient of friction is a measure of the amount of friction existing between two surfaces.
The coefficient of kinetic friction between the box and the floor is calculated as follows;
F - Ff = ma
where;
a is the acceleration of the boxm is mass of the boxFf is frictional forceF is applied forceF - μmg = ma
at a constant velocity, acceleration, a = 0
F - μmg = 0
F = μmg
μ = F/mg
μ = (52) / (50 x 9.8)
μ = 0.11
Thus, the coefficient of kinetic friction between the box and the floor is 0.11.
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A small pebble is dropped from the top of a very high cliff. approximately how fast is the pebble traveling (in m/s) by the time it has dropped a distance of 125 meters?
A small pebble is dropped from the top of a very high cliff, the pebble will be moving with a speed of 50 m/s.
Calculationvi=0
vf=?
a= 10m/[tex]s^{2}[/tex]
s= 125m
By newton's third law of motion,
2as = [tex]v_{f} ^{2}[/tex] - [tex]v_{i} ^{2}[/tex]
[tex]v_{f} ^{2}[/tex] = 2x 10 x 125
[tex]v_{f}[/tex] = [tex]\sqrt{2500}[/tex] = 50m/s
What are the three motion equations?These are the three equations:
v = u + at.
S = ut + 1/2a[tex]t^{2}[/tex];
[tex]v^{2}[/tex] = [tex]u^{2}[/tex]+ 2as.
Explain what the equation of motion is?The fundamental equation of motion in classical mechanics is Newton’s second law, which states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration an of its center of mass, or F = ma.
What different motions are there?Motion can be divided into three categories depending on its type, as follows: linear movement and Rotational Motion in oscillations.
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The speed of individual particle diffusion is influenced by temperature and particle size, not by concentration. True or false?.
Answer:
The speed of individual particle diffusion is influenced by temperature and particle size, not by concentration
Explanation:
If the speedometer of a car reads a constant speed of of 50 km/h can you say that the car has a constant velocity why or why not
No. You can say that the car had a constant speed, but not constant velocity if the speedometer consistently displays 50 km/h.
The car's velocity would change if its direction changed, even though it was moving at the same pace.
What is velocity?The speed at which something moves in a specific direction is known as its velocity.
Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is traveling along a path.
Consider the speed of a car driving north on a highway as an example. Because the velocity vector is scalar, its absolute value magnitude will always equal the motion's speed.
The standard unit of velocity magnitude is the m/s.
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How do signals from sensory neurons reach motor neurons?
Responses:
A-Signals move from dendrite to dendrite towards motor neurons.
B-Through interneurons in the brain and spinal cord that connect sensory neurons and motor neurons.
C-Motor neurons signal for the body to move the signal toward them.
D-Signals from sensory neurons do not get sent to motor neurons.
B. Signals from sensory neurons reach motor neurons through interneurons in the brain and spinal cord that connect sensory neurons and motor neurons.
What is sensory neurons?Sensory neurons are the nerve cells that work based on the sensory input from outside stimulus.
What is motor neurons?Motor neurons are special type of neurons or never cells that are found within the spinal cord and the brain.
How do signals from sensory neurons reach motor neurons?The sensory neurons carry afferent impulse to the central interneuron, which connects with the motor neuron.
The motor neuron carries efferent impulses to the effector, and cause the response observed.
Thus, signals from sensory neurons reach motor neurons through interneurons in the brain and spinal cord that connect sensory neurons and motor neurons.
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At a certain instant a moving object comes to
momentary rest.
Is that object accelerating at that moment?
Answer: no
Explanation:
momentary rest = object is NOT in motion at that instant of time
In the moment that the object is at rest, the velocity is 0 meaning that there is no acceleration.
What is Theoretical displacement
Displacement is the movement of unfavorable emotions from one thing or person to another.
As a kind of self-preservation, displacement is the act of shifting one's unfavorable emotions from one thing or person to another.
According to the notion, releasing stress or worry on a non-threatening target helps a person deal with negative emotions like fear or rage.
For instance, if a person feels angry because their boss yells at them, they might project those feelings onto someone or something else, such a member of their family or a piece of furniture.
For fear of losing their work, the person could feel unable to face their manager. As a result, they might vent their rage on a less dangerous person like their partner or housemate.
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How do scientific ideas change? Give an example
Explanation:
Question How do scientific ideas change? Give an exampleAnswerScientific ideas change over time as our evidence improves. The more experiments we do and the more data we collect, the better our scientific ideas become.I hope you are clear buddy.
The diagram above shows a current-carrying wire (the red dot),
that produces the magnetic field pattern shown in the diagram
when viewed from above.
Which direction is the current flowing in?
The direction of the current flowing in the wire is inside the plane when viewed from above.
The direction of a magnetic field in a current carrying conductor can be found out by using Right Hand Thumb Rule.
According to this rule. if we suppose a straight wire is carrying current, not if we align the thumb of our right hand in the direction of the flowing current, then the direction of the magnetic field is same as that of the the curling fingers.
In our question, if we apply this rule then we can find, if we align our fingers in the same manner as that of the magnetic field, then the direction of our pointing thumb will be inside. The direction of thumb pointing will be same as that of the current.
So, we can say that by Right Hand Thumb Rule, the direction of the flowing current is Inside when viewed from top.
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A spherical balloon is inflated with gas at a rate of 700 cubic centimeters per minute. how fast is the radius of the balloon changing at the instant the radius is 40 centimeters?
Rate of change is used to mathematically describe the percentage change in value over a defined period of time
A spherical balloon is inflated with gas at a rate of 700 cubic centimeters per minute. the radius of the balloon will be changing at a rate of 0.035 cm/min at the instant the radius is 40 centimeters
given
Radius = 40 cm
dv / dt = 700
to find
Rate by which radius of balloon is changing = ?
volume of sphere = 4/3 π [tex]r^{3}[/tex]
dv/dt = 4/3 * π [tex]r^{3}[/tex] dr/dt
dv/dt = 4/3 * 3 * π [tex]r^{2}[/tex] dr/dt
dv/dt = 4/3 * 3 * (3.14) * ([tex]40^{2}[/tex]) dr/dt
dv/dt = 20096 dr/ dt
700 = 20096 dr/dt
dr/dt = 700 / 20096
= 0.035 cm/min
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show work please .dsads
Answer:
what do u need for this question
which is larger
a, 4 km
b, 4 mi
c, same size
Answer: (b) 4 mi
Explanation:
We will convert both options to a singular unit.
4 km ≈ 2.49 miles
Now, we can more easily compare them.
4 miles ? 2.49 miles
4 miles > 2.49 miles
b, 4 mi is larger
a recipe calls for 30.0mL of baking soda. calculate the of the baking soda given its denstiy of 2.20g/mL
The mass of baking soda required that will have a volume of 30 mL is 66 g.
What mass of baking soda will have a volume of 30.0 mL given that the density of baking soda is 2.20 g/mL?The mass of a substance can be determined if the volume and the density of the substance are known.
The mass of a substance is related to the density and the volume of the substance by the following equation:
mass = density * volume
Considering the data provided about the baking soda:
volume of baking soda required = 30.0 mL
density of baking soda = 2.20 g/mL
Hence, mass of baking soda will be;
mass of baking soda = 2.20 g/mL * 30.0 mL
mass of baking soda = 66 g
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Who developed the equation that allowed the energy of the electron to be described quantum mechanically?.
Erwin Schrödinger developed the equation that allowed the energy of the electron to be described quantum mechanically.
Schrödinger's equation is,
Hamiltonian operator * Wave function = Energy * Wave function
It is partial differential equation which describes the wave function of a quantum - mechanical system. It is the most important part of quantum wave mechanics.
At first, Louis de Broglie stated that all particles could be treated as matter waves. Then Erwin Schrödinger specifically introduced a model of an atom, in which electrons are treated as matter waves.
Therefore, Erwin Schrödinger developed the equation that allowed the energy of the electron to be described quantum mechanically.
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Several wires of varying thickness are all made of the same material and all have the same length. If the wires are arranged in order of decreasing thickness, what can be said about the ordering of their resistance?.
The wires will be arranged in order of increasing resistance.
The resistance of a wire is given by
[tex]R=\frac{pL}{A}[/tex]
where
p is the resistivity of the material
L is the length of the wire
A is the cross-sectional area of the wire
The only quantity that varies in this problem is the thickness, which corresponds to the value of A for each of the many wires, all of which are constructed of the same material and have the same length (same L).
Since the resistance R is inversely correlated with the cross-sectional area A, we can infer from the formula that the smaller the value of A, the higher the value of R. Accordingly, if we arrange the wires in decreasing order of thickness, we are actually doing so in increasing order of resistance.
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If the falling time of an object is doubled, by what factor does the distance increase?
Answer:
length
Explanation:
If the falling time of an object is doubled, it will then that means that the length is doubled
Who discovered the nucleus by bombarding gold foil with positively charged particles and noting that some particles were widely deflected?.
Answer:
Ernest Rutherford (later Lord Rutherford)
3. A car speeds up from 10.0 m/s to 30.0 m/s in 3.0 s. What is its acceleration? In your response, show your work, the given and unknown quantities, the equation and any necessary algebra. Express your answer with the correct number of significant digits
Answer:
21.872
Explanation:
The mass of the car is 1200 kg.
(a) Calculate, for the first 20s of the motion,
(1) the distance travelled by the car
The distance travelled by the car in the first 20 seconds of the motion is 130 m.
What is the area under speed time graph?
The area under the speed-time graph is the distance the particle travels.
The distance traveled by the car in the first 20 seconds is calculated as follows;
From the speed - time graph, at 20 seconds, the speed of the car is 13 m/s.
Distance = area of the graph = area of triangle formed from time, 0 s to 20 seconds.
Distance = ¹/₂bh
where;
b is the base of the triangle formed = 20 s - 0 s = 20 sh is the height of the triangle formed = 13 m/sSubstitute the given parameters and solve for the distance traveled by the car.
Distance = ¹/₂bh
Distance = ¹/₂(20)(13)
Distance = 130 m
Thus, the distance travelled by the car in the first 20 seconds of the motion is 130 m.
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The missing graph is in the image attached.
an ink-jet printer steers charged ink drops vertically. each drop of ink has a mass of 10-11 kg, and a charge due to 751896 extra electrons. it goes through two electrodes that gives a vertical acceleration of 104 m/s2. the deflecting electric field is mv/m.
The deflecting electric field is 9.50 x 10^14 mv/m.
The force on the drop of ink due to vertical acceleration = ma
And the force on the drop due to electrodes = qE
To calculate the deflecting electric field, we need to equate both these forces,
Hence, qE = ma
As there are 751896 extra electrons, the charge due to them will be = 751896 x 1.6 x 10^-19
M = mass of each drop of ink = 11 kg
A = acceleration of the drop of ink = 104 m/s^2
Putting the above values in the equation, qE = ma
1.6 x 10^-19 x 751896 x E = 11 x 104
On solving the above equation
E = 9.50 x 10^14 mv/m
Hence, the deflecting electric field is 9.50 x 10^14 mv/m.
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What is the object displacement over the 9 seconds interval
The object displacement over the 9 seconds interval will be 0 m. Displacement can be define as the shift in the position of an object with respect to the reference frame.
What does a physical displacement mean?An object's location changes if it moves with regard to a reference frame, like when a passenger moves to the back of an airplane or a lecturer moves to the right with respect to a whiteboard. Displacement is the term used to explain this shift in position.
How is the displacement formula created?The distance an item travels from its starting point until it reaches a certain velocity can be calculated using the formulas t = (v vi)/g and y = gt2/2 + vit. The equation for the object's velocity at a particular distance from the starting point is the outcome of this.
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ILL GIVE 40 POINTS TO THE FIRST PERSON TO ANSWER
What is the most likely evidence of an energy transformation taking place when a wire that is twisted and turned breaks? (5 points)
1: Reddish glow is emitted as kinetic energy is transformed into thermal energy
2: Reddish glow is emitted as kinetic energy is transformed into electrical energy
3: Broken end of the wire turns hot as kinetic energy is transformed into thermal energy
4: Broken end of the wire turns hot as kinetic energy is transformed into electrical energy
Answer:
It is 3
Explanation:
the reason its 3 is the wire is electrical and it heats up like a phone screen after using it for too long and its kinetic energy to thermal because the energy in the wires stop when they are broken because there is no way the energy can jump the wires
What is the “fight or flight” response and how does caffeine trigger this response?
Answer: Caffeine can change your response pattern; that jlot of wonderful energy people love can send your brain and body panicking which in tow starts up your flight or fight response.
Suppose you go on a trip that covers 360 km and takes 6 Hours. What would your average speed be? 2. A car travels around a mountain. It travels a distance of 120 miles in 3 hours. What is the average speed of the car?
I need the answer for this and I want a step by step explanation on how you got the answer and if I need to use formulas.
Answer:
1. 360/6=60 Kilometers per hour
2. 120/3=40 Kilometers per hour
Explain why astronomers use light years or astronomical units to describe distances in space instead of miles or meters.
Both the solar system and interstellar space are very large. 150 million kilometers are equivalent to one astronomical unit. Instead of having to count everything in millions or billions of kilometers, it is much simpler to count the distances if they are in counts of Astronomic Units.
Why light years are used as a distance measurement in astronomy?Astronomers can establish how far back in time they are looking by measuring in light-years. Everything we see in the night sky has already happened since it takes light time to reach our eyes. In other words, if you see something from a distance of 1 light-year away, you see it precisely as it was a year ago.However, the fundamental justification for utilizing light years is due to the vast distances we deal with in space.Due to the fact that objects in space are too far apart from one another, astronomers measure distance in space using an astronomical unit called a light-year rather than kilometers. The distance that a beam of light travels in a single year on Earth is referred to as a "light-year."By counting the wavelengths—the separation between successive peaks of the wave pattern—between two places, laser light is commonly employed to measure distances. The approach is inherently very precise due to the short wavelength (633 nanometers for the most common red light utilized).Why do astronomers use light years or astronomical units to describe distances in space instead of miles or meters?
Both the solar system and interstellar space are very large. 150 million kilometers are equivalent to one astronomical unit. Instead of having to count everything in millions or billions of kilometers, it is much simpler to count the distances if they are in counts of Astronomic Units.
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A closed container holds 3,0 moles of co2 gas at stp. what is the total number of moles of ne that can be placed in a container of the same size at stp
By ideal gas approximation, the total number of moles of Ne is 3 moles.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
STP condition (P = 1.01 x 10⁵ Pa, T = 273 K)
n = 3 moles
The ideal gas depends on the number of moles. Hence, the total number of moles of Ne will be the same as CO₂ (3moles).
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I'm kind of in a hurry would love if you help me here
a string or rope will break apart if it is placed under too much tensile stress. thicker ropes can withstand more tension without breaking because the thicker the rope, the greater the cross-sectional area and the smaller the stress. one type of steel has density 7710 kg/m3 and will break if the tensile stress exceeds 7.0×108n/m2. you want to make a guitar string from a mass of 4.2 g of this type of steel. in use, the guitar string must be able to withstand a tension of 900 n without breaking. your job is the following.
The maximum length the strig can have is 1.89 x 10^10 m.
Tensile stress may be defined as the external forces acting per unit area on a material which cause the material to stretch. This stress acts along the axis of the material.
Density is given by the formula:
Density= mass/volume
So, volume is given by;
Volume= mass/density
Mass of string in kg= 4.2/1000= 0.0042 kg.
Density of steel is in kg/m^3.
Then volume V will be;
V= 0.0041/7710 = 5.31 x 10-7m^3
Now we know that stress = Force/Area
Thus, Area is given by; Area = force/stress => 900/7*10^8= 2795.95m^2
Length can be determined by= volume/Area =>5.31^10-7/2795.95
Therefore, the maximum Length of string is = 1.89 x 10^10 m.
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Complete Question:
If A string or rope will break apart if it is placed under too much tensile stress. Thicker ropes can withstand more tension without breaking because the thicker the rope, the greater the cross-sectional area and the smaller the stress. One type of steel has a density of 7710kg/m3 and will break if the tensile stress exceeds 7.0×108N/m2. You want to make a guitar string from a mass of 4.2 g of this type of steel. In use, the guitar string must be able to withstand a tension of 900 N without breaking. Your job is the following.
(a) Determine the maximum length the string can have
consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius aaa and positive charge qqq distributed evenly along its circumference.
Ez = kqz / (z^2+a^2)^3/2 is the answer.
The expression of the electric field is,
E=kq / r^2
Here, r is the distance and its value is [tex]\sqrt{z^2 + a^2}[/tex]
Substitute the value of r in the above expression.
E=kq / [tex]\sqrt{z^2 + a^2}[/tex]^2
The expression of the electric field along the z-direction is given by,
dEz=dEcos[tex]\int\limits {dEcosθ} \,[/tex]
Here, the value of the cosine function is z / [tex]\sqrt{z^2 + a^2}[/tex]
On integrating the above expression and substituting the value
[tex]\int\limits{dEz} \,[/tex] =[tex]\int\limits{dEcosθ}[/tex]
Ez = Ecosθ
Ez = kq / [tex]\sqrt{z^2 + a^2}[/tex]^2 * z / [tex]\sqrt{z^2 + a^2}[/tex]
Ez = kqz / (z^2+a^2)^3/2
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Although part of your question is missing the question is Consider a uniformly charged ring in the XY plane, centered at the origin. The ring has a radius a and positive charge q distributed evenly along its circumference. What is the magnitude of the electric field along the positive z-axis due to the ring? Use k in your answer, where k=1/4πε
what was a control variable in this experiment? group of answer choices type of wire used final length of wax original length of wax thermal conductivity of wire
In the given experiment, the length of the wire, the type of wire utilized, and the thermal conductivity of the wire are the independent variables.
In the mentioned experiment, three kinds of variables are used, that is, the independent variable, the dependent variable, and the controlled variable. Of these the independent variables are the one that does not get modified, however, can be modified by the scientist, while the dependent variables are the one that modifies when the independent variables modify, and the controlled variables are the ones that are maintained the same throughout.
In the given experiment, the length of the wire, the type of wire utilized, and the thermal conductivity of the wire are the independent variables.
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define center of gravity
Answer: a point from which the weight of a body or system may be considered to act. In uniform gravity it is the same as the center of mass.
Explanation:
look it up