The magnitude of the frictional force on the skier is 20 N.
The magnitude of the vertical force of skier is 666.14 N.
What is the frictional force on the skier?The value of the frictional force on the skier is determined by applying Newton's second law of motion as follows;
F - Ff = ma
where;
F is the applied force in horizontal directionFf is the frictional force m is the mass of the skier a is the acceleration of the skierAt a constant speed, the acceleration, a = 0
F - Ff = 0
F = Ff
20 N = Ff
The vertical force due to weight of the skier is calculated as follows;
Fₙ = mg cosθ
where;
θ is the angle of inclination of the hillFₙ = (75 x 9.8) cos(25)
Fₙ = 666.14 N
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Adding which object to a circuit will create a potential energy difference in a circuit?
OA) switch
OB) wire
OC) light bulb
OD) battery
Answer:
battery
Explanation:
A battery establishes an electric potential difference.
Answer:
D) Battery
Explanation:
Battery is a source that produces electric charges with different concentrative regions
[tex].[/tex]
6. If a graph is showing a positive slope, and the graph itself is a straight line, what must be the x and y axis if the straight
line is showing a constant velocity?
Answer:
See below
Explanation:
x = time y = position (displacemet)
PLEASE HELP ME
How does a psychologist compare to a biologist? Consider similarities and differences.
A psychologist differ from a biologist in that a psychologist deals with helping people solve their emotional and mental problems by way mind analysis while biologists are scientists who studies living organisms.
Understanding the biologistsBiology refers to the study of life. Someone who studies biology is called a biologist.
The biologists helps us to understand the following:
The cellular composition of living organismsThe various systems which effectively makes up our body.The variations which exist between organisms of the same or different species.The genetic makeup of plants and animals.Cellulose respiration and others.So therefore, a biologists helps us understand all about plants and animals while the psychologists deals with studying human minds.
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identify the forces on the car. check all that apply. identify the forces on the car.check all that apply. gravity f⃗ gf→g normal force n⃗ n→ friction f⃗ f→ drag f⃗ drag
Gravity, friction, and drag force are the forces that are acted on a car.
What are gravity, friction, and drag force?Gravity is defined as a force by which one body attracts other objects toward its center. Friction is the force that resists the relative motion of solid surfaces, fluid, and material that are sliding against each other. There are several types of friction force i.e. Dry friction is a type of force that opposes the relative motion of two solid surfaces that are in contact with each other.
Drag is a mechanical force that is generated by the interaction and physical contact of a solid body with a liquid or gas. It is not produced by a field force, gravitational field, or an electromagnetic field, in which one object can affect another object without any physical contact with each other.
So we can conclude that the forces acting on the car are gravity, friction and drag force.
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below are diagrams for the bright line spectra of four elements and the spectrum of a mixture of unknown gases.which elements are in the unknown?
A) Li
B) H
C)He
D)Na
The elements which are in the unknown according to the diagram given is He and is therefore denoted as option C.
What is a Spectra?This is referred to as a type of graph which shows the intensity of light being emitted over a range of energies and it varies with properties such as wavelength or frequency. When light is passed through a prism, band of colors are usually observed which signifies light spectrum with the plural being spectra.
In the diagram given , the element He and the unknown have the most similar spectra observed as a result of the lines which fall in almost the same range and place and it makes it the most likely component of the mixture of unknown gases.
This is therefore the reason why option C was chosen as the most appropriate choice.
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put a pipe over the end of a wrench when trying to turn a stubborn nut on a bolt, to effectively make the wrench handle twice as long, you will multiply the torque by
Answer:
Γ = r x F vector notation for torque
Doubling r (the length) will double the torque applied
a 11.8-m-long wire of mass 152 g is stretched under a tension of 266 n . a pulse is generated at one end, and 22.0 ms later a second pulse is generated at the opposite end.
First, with m = 0.123 kg, pressure force, T = 255N, and length = 10 m, Using the formula V = ?, we've haste of 144 m/s.
After 20 milli alternate = 0.02 s, the first palpitation would have run along the line for
This means that it only left 10m-2.88 m = 7.12 m for the 2 pulsesto run.
therefore, the distance which the 2 beats will first meet would be
from the position where the first pulse is transferred.
exactly the same as the answer at the reverse)
remaining distance is divided by 2 as the 2 pulse are moving with the same speed towards each other.
Mass
Mass is the volume of matter in a physical body. It's also a measure of the body's indolence, the resistance to acceleration( change of haste) when a net force is applied. An object's mass also determines the strength of its gravitational magnet to other bodies.
The SI base unit of mass is the kilogram( kg). In drugs, mass isn't the same as weight, indeed though mass is frequently determined by measuring the object's weight using a spring scale, rather than balance scale comparing it directly with known millions. An object on the Moon would weigh lower than it does on Earth because of the lower graveness, but it would still have the same mass. This is because weight is a force, while mass is the property that( along with graveness) determines the strength of this force.
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A car starts at rest and accelerates at a constant rate for 12 seconds to a speed of 30 m/s. a) What is the acceleration
Answer:
use the equations of motion
A basketball with a mass of 2.2 kg weighs 19.6 N on Venus. What is
the acceleration due to gravity on Venus? (show work)
Im not sure but no one can kek lskhd. akshd
Consider a 5.0 kg object traveling to the right at 25 m/s and colliding with a stationary 1.0 kg object.
a. What is the total momentum of the system?
b. If the first object continues at 20. m/s to the right after the collision, what is its
new momentum?
c. How much momentum was transferred to the 1.0 kg object?
d. What is the final velocity of the 1.0 kg object?
Momentum of system remains conserved before and after the collision. Thus, a. Total momentum of system, p = 125kg-m/s
b. New momentum of first object, p = 100kg-m/s
c. Momentum transferred to 1.0kg object, p = 41.6kg-m/s
d. Final velocity of 1.0kg object, v = 41.6m/s
Given, mass of first object [tex]m_{1}[/tex]= 5.0kg and mass of second object [tex]m_{2}[/tex] = 1.0kg
Velocity of first object [tex]v_{1}[/tex]= 25m/s and velocity of second object [tex]v_{2}[/tex] =0 m/s
Thus, Total momentum of the system, p = mv
[tex]p= m_{1} v_{1} +m_{2} v_{2}[/tex]
p = 5*25 + 1*0
p = 125kg-m/s
Now, after collision first object continues to move with final velocity 20m/s. Hence, new momentum, p = mv
p = 5*20
p = 100 kg-m/s
Momentum transferred to 1.0kg object, p= mv
where m = 1.0kg and v = final velocity of 1.0kg object
For calculating final velocity of second object,
[tex]v_{2f} = (\frac{2m_{1} }{m_{1} +m_{2} } )v_{1i}+ (\frac{m_{2}-m_{1} }{m_{1}+m_{2} } )v_{2i}[/tex]
[tex]v_{2f}[/tex]= [tex](\frac{2*5}{5+1} )25 + (\frac{1-5}{5+1} )[/tex]*0
[tex]v_{2f} = 41.6 m/s\\[/tex]
Thus, momentum transferred to 1.0kg object, p = mv
p = 1* 41.6
p = 41.6kg-m/s
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a book slides across a level, carpeted floor with an initial speed of 3.85 m/s and comes to rest after 3.25 m. calculate the coefficient of kinetic friction ???? between the book and the carpet. assume the only forces acting on the book are friction, weight, and the normal force.
The coefficient of kinetic friction between the book and the carpet is 0.23.
What is coefficient of kinetic friction?
The coefficient of kinetic friction is the ratio of the friction force to the normal force experienced by a body moving on a dry, rough or non-smooth surface.
From Newton's second law of motion, the coefficient of kinetic friction is calculated as follows;
F - Ff = ma
where;
F is the applied forceFf is the frictional forcem is mass of the objecta is the acceleration of the objectSince force of friction is the only force acting on the object, our final equation becomes;
-Ff = ma
-μmg = ma
-μg = a
-μ = a/g
μ = - a/g
The acceleration of the book is calculated as follows;
v² = u² - 2as
where;
v is the final velocityu is the initial velocitya is the accelerations is the distance traveledWhen the book stops, the final velocity, v = 0
0 = u² + 2as
-2as = u²
-a = u²/2s
-a = (3.85²) / (2 x 3.25)
a = - 2.28 m/s²
Coefficient of kinetic friction = - (-2.28 m/s² / 9.8 m/s²) = 0.23
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URGENT!! ILL GIVE
BRAINLIEST! AND 100 POINTS
A stack of newspapers is burned completely to ash in a laboratory. How does the resulting mass relate to the initial mass of the stack of newspapers?
A. The mass of the gases and the ash should be double the mass of the initial stack of newspapers.
B. The mass of the gases and the ash should be one-half the mass of the initial stack of newspapers.
C. The mass of the gases and the ash should equal the mass of the initial stack of newspapers
D. The mass of the gases and the ash should be one-fourth the mass of the initial stack of newspapers
C. The mass of the gases and the ash should equal the mass of the initial stack of newspapers. (conservation of mass)
Answer:
c
Explanation:
How does a decrease in temperature effect the volume of a balloon?
Due to the gas within cooling off due to the low temperature, the balloon's volume shrinks.
Briefing :The helium balloon rises because it is lighter than the same amount of air at ambient temperature. It is heavier than the same volume of air at low temperatures because its volume is too small. Because the average kinetic energy of the gas molecules in a balloon drops as temperature rises, the frozen balloon shrank. As a result, the molecules move more slowly and collide with the balloon's interior wall less frequently and weakly, causing the balloon to somewhat contract.
What causes the balloon's volume to change?If the temperature remains constant and the pressure decreases, the volume will increase (balloon expands). If the pressure increases while T remains constant (let's say you're holding the balloon underwater), V will decrease (balloon shrinks). When the temperature rises and the volume remains constant (like in an aerosol can), P increases.
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a car starts from rest and reaches a velocity of 15 m s– 1 in 5 seconds. Calculate how far the car travelled in this time
The car travels a distance of 75 m.
Given:
Initial velocity (u) = 0 m/s
Because the body stars from rest,
Time (t) = 5 sec
Final velocity = 15m/s
Using first equation of motion,
v = u + at
15 = 0 + a(5)
5a = 15
a = [tex]\dfrac{15}{5}[/tex]
a = 3 [tex]m/s^{2}[/tex]
∴Therefore Acceleration = 3m/s²
Using third equation of motion:-
s = Ut + ½ at²
s = (0 × 5) + ½ × 3 × (5)²
s = ½ × 3 × 25
s = [tex]\dfrac{75}{2}[/tex]
s = 37.5m
Hence the Distance moved by the car = 37.5 m
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a point charge q1 is held stationary at the origin. a second charge q2 is placed at point a, and the electric potential energy of the pair of charges is 5.4×10−8j. when the second charge is moved to point b, the electric force on the charge does −1.9×10−8j of work.
The electric potential energy of the pair of charges when the second charge is at point b is U at b = +7.3×10⁻⁸J.
Electric potential is the amount of work done in moving point charge from infinity to aspecific point.
Calculation of the electric potential energy:
Here the particle should be moved from the point at the time when the potential energy should be U a
The U b should be the change in the potential energy
W is work done.
(W at a )-(W at b) = U a - U b
U b = U a - (W at a )+(W at b)
So,
= 5.4 × 10⁻⁸J - ( -1.9×10⁻⁸ J)
= +7.3×10⁻⁸J.
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6.when trying to stop a car on icy pavement in as short a distance as possible, is it better to slam on the brakes and skid to a stop or apply the brakes more gently and roll to a stop? (hint: what type of friction is acting between your tires and the roadway if your tires are sliding along the road? what if your tires are rolling along the road?) briefly explain.
So there are two types of friction one is kinetic friction which acts when car skid on icy pavement and other is rolling friction which acts which helps tire to roll along the surface now as we know that coefficient of rolling friction μr is greater than coefficient of kinetic friction μk .
So due to which friction force will be more effective when tire rolls along the surface not skid so in order to stop car in minimum distance possible on icy pavement should apply brakes more gently.
Kinetic friction is defined as a force that acts between shifting surfaces. A body moving at the floor reviews a force in the opposite direction of its motion. The importance of the force will rely on the coefficient of kinetic friction among the two materials.
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List the factors that affect gravitational potential energy.
There are three factors that affect gravitational potential energy:
MassHeight (distance)GravityGravitational potential energy is potential energy an object holds when falls towards another object due to gravity.
for instance, if we lift a stone and try to throw it from a height, it will have gravitational potential energy whereas stones in the ground have no gravitational potential energy.
Height is directly proportional to the gravitational potential energy(GPE). The higher the height, the more GPE it will have. Mass is also directly proportional to GPE and so gravity does.the formula of GPE: E = mgh where
m = mass, g = gravity and h = height
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Consider an electron at rest and answer the question that follows, giving a reason for every reponse (a) can you make the electron begin to move with a very strong magnet (b) can you make an electron begin to move using as electric field
Answer: (a) No we cannot able to move the electron with strong magnet field.
(b) yes we can able to move the electron with strong electric field
Explanation: Theoretically, both the gravitational and electric fields might speed up a travelling electron, but in most situations, only the electric field will do so significantly. Since the magnetic force is always perpendicular to the velocity, it will not affect the speed of an electron in motion.
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By applying a strong magnetic field, the electron will not travel. By applying an opposite electric field or the same electric field, the electron will move in a different direction, respectively.
The definition of an electric field is the electric force per unit of charge. It is assumed that the field's direction corresponds to the direction in which a positive test charge would experience force. The electric field is directed radially inward toward a negative point charge and radially outward from a positive charge. a circumstance present in the vicinity of a magnet or an electric current, defined by the presence of magnetic poles and a discernible magnetic field at every point in the vicinity.
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A sand bag is dropped from a hot air balloon. It reached the ground 13 seconds later. What was the final velocity of the sand bag? (neglect air resistance)
a=
vf=
vi=
t=
Answer:
V = 127.4 m/s
Explanation:
Using the following expression:
V = V₀ + a * t
Applying to vertical movement:
V = 0 + g * t (Start at rest and a = g = 9.8 m/s²)
V = g * t
V = 9.8 * (13)
V = 127.4 m/s
Please pick the best TWO choices for the following statement:
Some fats are good for you like ______ & ________.
A.
Monounsaturated
B.
Hydrogenated
C.
Polyunsaturated
D.
Saturated
Some fats are good for you like Monounsaturated ( A ) and Polyunsaturated ( C ) fats.
Monounsaturated and Polyunsaturated fats lower the risk of disease. These are good unsaturated fats. Foods that are rich in good unsaturated fats are fish, seeds, nuts and vegetable oils. Some of the vegetable oils that are good for health are olive, canola, sunflower, soy and corn oil.
Hydrogenated oil produces trans fat. If trans fat is taken even in small quantities, it increases disease risk. Food items rich in saturated fats are butter, cheese, ice cream, coconut oil etc. Eventhough these are not as harmful as trans fats, it is better to be consumed in moderate quantities.
Therefore, some fats are good for you like Monounsaturated ( A ) and Polyunsaturated ( C ) fats.
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Calculate how many minutes it takes sunlight reach us from the sun. Light travels at 3 x 10^8
m/s and the sun is about 144 million km away
Sunlight will take 8 minutes to reach the Earth.
Sunlight is part of the electromagnetic radiation emitted by the Sun, especially infrared, visible and ultraviolet light.
Light is travelling with the speed of [tex]3 * 10^{8}[/tex] m/s
Distance between Sun and Earth is 144 million km
1 km = 1000 m
1 million km = [tex]10^{6}[/tex] km
[tex]10^{6}[/tex] km = [tex]10^{9}[/tex] m
144 million km = 144 * [tex]10^{9}[/tex] m
According to the speed, distance and time relationship, speed is directly proportional to the ration of distance and time.
Mathematically [tex]Speed = \frac{Distance}{Time}[/tex][tex]3 * 10^{8} = \frac{144 * 10^{9} }{Time}[/tex]
Time = [tex]\frac{144 * 10^{9} }{3* 10^{8} }[/tex]
Time = 480 sec
Time = 8 minutes
Time taken by the sunlight to reach the Earth's surface is 8 minutes.
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If an object has a mass of 4 kg and an acceleration of 8 m/s2, what is the force this object exerts?
The force acting on the object will be 32 N.
Newton's second law of motion states that, "the force is equal to the change in momentum per change in the time". The mathematical form of the law is given below.
[tex]F = \frac{dP}{dt}=\frac{d(mv)}{dt}=m\frac{dv}{dt}=ma[/tex]
Where P = momentum, t = time, m =mass, v = velocity, a = acceleration and F = force.
The mass of the object is 4 kg and acceleration is 8 m/s^2. Substitute the values in the equation and we will get the force.
F = ma
F = 4 kg * 8 m/s^2
F = 32 kg.m/s^2
F = 32 N
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Do automobiles rust quicker in hotter or colder climates? Explain.
Answer:
colder because of moisture
______ is the sum of all the kinetic energy and potential energy found in the particles of a material.
1. Thermal energy
2. Potential energy
3. Kinetic energy
4. Temperature
Answer:
1. Thermal Energy
Explanation:
to determine the weight of object, you could? (a) use a beam balance (B) Use a spring balance (c) find the force necessary to give it a certain acceleration (d) use none of the above (e) use any of these methods
Answer:
A physical balance can be used to measure both mass and weight of an object.
The girl is wearing shoes with an area of 150m2. What is the pressure?
The pressure exerted by the girl on the ground if she stands on two feet is 18333.33 N/m².
What is the pressure exerted by the girl on the ground if she stands on two feet?The pressure exerted by the girl on the ground if she stands on two feet is calculated as follows from the formula of pressure.
Pressure is defined as the force per unit area or the ratio of force exerted and the area in which the force is exerted.
Mathematically;
Pressure = force / areaTh unit of pressure is N/m²
The force exerted by the girl is equal to the weight of the girl
Force = 550 N
Area of one shoe = 150 cm²
Area of one shoe in m² = 150 cm² * 1 m²/10000 cm²
Area of one shoe in m² = 0.015 m²
Area of two shoes = 2 * 0.015 m² = 0.03 m²
Pressure = 550/0.03 N/m²
Pressure = 18333.33 N/m²
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Complete question:
A girl weighs 550 N. The girl is wearing shoes with an area of 150cm². What pressure will be exerted by the girl on the ground if she stands on two feet?
a proton beam in an accelerator carries a current of 126 ????a. if the beam is incident on a target, how many protons strike the target in a period of 22.0 s?
The number of protons that strikes the target is 1.7325 x 10²² protons.
What is quantity of charge?
The quantity of a charge is the amount of charge or electron flowing over a given period of time.
Mathematically, the quantity of a charge is given as;
Q = It
where;
Q is the quantity of charge of the protonI is the current t is the time of current flowQ = (126 A) x (22 s)
Q = 2,772 C
The charge of the proton is 2,772 C.
The number of protons in a 2,772 C charge is calculated as follows;
1.6 x 10⁻¹⁹ C ---------> 1 proton
2,772 C ---------------> ?
= (2,772 x proton) / (1.6 x 10⁻¹⁹)
= 1.7325 x 10²² protons
Thus, we can conclude that during a period of 22 seconds, a total of .7325 x 10²² protons struck the target.
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Remembering that the current in the filament is proportional to the electric field, what is the current in the filament following the doubling of its length?.
The current in the filament is halved following the doubling of its length.
Let the current flowing in the filament as I, the electric field in the conductor is E and the length of the conducting filament is L.
We know from ohm's law,
I = V/R
where V is the potential difference and R is the resistance of the conductor,
We also know,
R = ρL/A
where ρ is the resistivity of the conductor and the A is the area of the conductor,
I = VA/ρL
I/A = V/ρL
I = AE/ρ
if area and resistivity are constant,
I ∝ E
Here E = V/L
If V = constant,
E ∝ 1/L
Means we can conclude,
I ∝ E ∝ 1/L
So we can tell that on doubling the length of the filament will decrease the current by half.
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hellllllllllllllllllp asap! answering on less then 15 mins would be great :/ i need someone with a great knowledge of the earth, layers, astronomy, and convection,and density
Convection differs from radiation in the sense that in radiation, matter is not involved. Option D.
What is heat transfer?The term heat transfer has to do with the movement of heat from one point another. Recall that heat transfer is one of the things that does occur in nature. There are three kinds of heat transfer that occur in nature and these are;
ConductionConvectionRadiationLet us recall that in the process of convection, there is the movement of heat from one point to the other via the actual movement of the particles of the substance. On the other hand, radiation occur when heat is transferred without an movement or contact between the objects between which the heat is transferred. Thus, when air masses are moving, it is a process of convection taking place.
Hence, the difference between conduction and radiation is that matter is involved in convection but not in radiation.
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Which law motion explains why a ball hit softly doesn’t travel as far as one that is it hard?
you have too high of a spin rate with your driver and irons.
The faster the swing speed the longer the distance from the tee. Therefore, to get the ball as far down the fairway as possible, you need to swing as hard as possible without losing balance posture, or control of the club. A softer ball provides more control on off-center shots and more distance on low-impact shots. I downgraded it a bit due to the high price.
These Titleist Tour golf balls are perfect for the beginner golfer who needs a lot of forgiveness on their shots. All in all the Pro is a seasoned athlete who hits the ball so far because he plays on the courts in the best possible conditions. Athletic golf skill maximizes swing speed, thereby maximizing distance. Fairway agronomy, on the other hand, pushes the ball farther. The reason taller golfers hit longer is primarily that their size provides a framework for greater leverage with more muscles and joints.
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