what is the difference between contact and non contact forces?​

The man did 16 Joules of work on the table.

Work done is simply defined as the energy transfer that takes place when an object is either pushed or pulled over a certain distance by an external force. It is expressed as;

Work done = force × distance

Where force is the amount of force applied and distance is the distance the object was moved.

In this case;

So, substituting these values into the formula, we get:

Work done = force × distance

Work done = 8N × 2m

Work done = 16Nm

Work done = 16 Joules

Therefore, the work done on the table is 16J.

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player of baseball. Kinetic friction, normal force, and weight are the three forces at work on it.

The term "force" is defined precisely in science. An object does not have a force inside of it or within it. Another object applies a force to the first. Both living things and non-living things can be considered to be parts of a force.

Force is the pushing or pulling of an object. When objects interact with one another, push and pull are generated. You can also describe force using words like stretch and squeeze. An object's mass changes when a force is applied to it, and the definition of force in physics is:

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The moment of inertia of the given system about the axis of spin is 1.49376 Kg[tex]m^{2}[/tex] ≈ 1.5 kg[tex]m^{2}[/tex].

The moment of inertia of the system is given by the sum of the moment of inertia of the Disc and the moment of inertia of the clay.

Mathematically,

I=1/2 MR^2 +mr^2

Where M= mass of the disc

R= radius of the disc.

m= mass of lump or clay.

r= radius of clay or lump.

In the question given Data,

Potter wheel mass M=5.4Kg

The radius of potter disc R =0.65m

Lumps mass m=2.1Kg

lump  radius r= 0.41m

Now applying the moment of inertia equation we get,

I=1/2×5.4×(0.65)^2 + 2.1×(0.41)^2

I=1.49376

I=1.5kg[tex]m^{2}[/tex].

Hence the moment of Inertia is

I=1.5kg[tex]m^{2}[/tex].

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Answer:

seismograph

Explanation:

seismograph

Answer:

seismometers and seismograph

Explanation:

this instrument respond to ground noise and shake like quake and volcanoes eruption

The reactants in the given chemical equation are methane (CH₄) and oxygen (O₂), while the products are carbon dioxide (CO₂) and water (H₂O).

During a chemical reaction, the atoms of the reactants reorganize to form new compounds in the products. A chemical change is this atomic rearrangement.

A chemical change is the transformation of one or more substances into new ones with distinct chemical and physical properties. New substances are created when the original substances' atoms are rearranged and new chemical bonds are formed during a chemical change.

Typically, a transfer of energy in the form of heat, light, or sound occurs in conjunction with this kind of change. Reactions like combustion, oxidation, decomposition, and synthesis are all examples of chemical changes. Physical changes, on the other hand, involve alterations in a substance's physical properties without altering its chemical composition.

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The normal force on the truck due to the highway surface is 18109.26 N.

Centripetal force is the force that is directed towards the center of a circular path that keeps an object moving along that path. It is given by the equation:

Fc = mv²/r

where Fc is the centripetal force, m is the mass of the object, v is its velocity, and r is the radius of the circular path.

First, we need to convert the speed from miles per hour to meters per second:

75.0 mi/h = 33.5 m/s

Next, we can use the centripetal force equation:

F_c = (m*v²)/r

where F_c is the centripetal force, m is the mass of the vehicle, v is the velocity of the vehicle, and r is the radius of the curve.

We can find the angle of the banked curve in radians:

θ = tan⁻¹(v²/(r*g))

where g is the acceleration due to gravity, which is approximately 9.8 m/s².

A. For the car:

m = 1325 kg v = 33.5 m/s r = 255 m θ = tan⁻¹(v²/(r*g)) = tan⁻¹((33.5 m/s)² / (255 m * 9.8 m/s²) = 0.49 radians

The normal force on the car is given by:

N = mgcos(θ) + F_c*sin(θ)

where N is the normal force and cos(θ) and sin(θ) are the components of the gravitational force and the centripetal force, respectively, parallel and perpendicular to the surface of the road.

Plugging in the values, we get:

N = (1325 kg * 9.8 m/s² * cos(0.49)) + ((1325 kg * (33.5 m/s)²) / (255 m) * sin(0.49)) N = 12434 N

Therefore, the normal force on the car due to the highway surface is 12434 N.

B. For the truck:

m = 2050 kg v = 33.5 m/s r = 255 m θ = tan⁻¹(v²/(r*g)) = tan⁻¹((33.5 m/s)² / (255 m * 9.8 m/s²)) = 0.49 radians

The normal force on the truck is given by:

N = mgcos(θ) + F_c*sin(θ)

Plugging in the values, we get:

N = (2050 kg * 9.8 m/s² * cos(0.49)) + ((2050 kg * (33.5 m/s)²) / (255 m) * sin(0.49)) N = 18109.26 N

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4 N force must be. Marissa pulls on the window curtain, An object having mass changes its velocity in response to a push or pull.

In science, the concept of "force" is well defined. A force of this magnitude can be described as a push or a pull, which is perfectly fine. It is erroneous to state that a force "is in it" or "is contained" within an item. A force from another can exert pressure on something.

Force: An object's shape, as well as its condition when at rest or in motion, can all be changed physically by force. In the S.I., a Newton is a unit of force.

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Answer:

the asnsweis wavew

Explanation:

i just need rge points tbh

The length of the eraser is 4.6 cm. There are two significant figures in the measurement.

Measurement of length is the process of determining the distance between two points or the size of an object using standard units of length. The most commonly used unit of length in the International System of Units (SI) is the meter, which is defined as the distance traveled by light in a vacuum during a specific time interval.

In addition to the meter, other units of length are also used in different countries and applications.

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Answer:

Explanation:

The motion of the projectile can be modeled using the following kinematic equation:

h = vi*t + (1/2)at^2

where h is the height of the projectile, vi is the initial velocity, a is the acceleration due to gravity (approximately -9.8 m/s^2), and t is the time elapsed.

We want to find the time it takes for the projectile to reach a height of 375 m, so we can set h = 375 and solve for t:

375 = 100t + (1/2)(-9.8)*t^2

Simplifying and rearranging, we get:

4.9t^2 + 100t - 375 = 0

We can solve this quadratic equation using the quadratic formula:

t = (-b ± sqrt(b^2 - 4ac)) / (2*a)

where a = 4.9, b = 100, and c = -375.

Plugging in the values, we get:

t = (-100 ± sqrt(100^2 - 44.9(-375))) / (2*4.9)

Simplifying, we get:

t = (-100 ± sqrt(10000 + 7350)) / 9.8

t = (-100 ± sqrt(17350)) / 9.8

We take the positive value of t, since we are only interested in the time it takes for the projectile to reach a height of 375 m:

t = (-100 + sqrt(17350)) / 9.8

t ≈ 21.43 seconds (rounded to two decimal places)

Therefore, it takes the projectile approximately 21.43 seconds to reach a height of 375 m.

Answer:

We can use the work-energy theorem to find the average power produced by the rocket:

Work done = Change in kinetic energy = (1/2)mv_f^2 - (1/2)mv_i^2

where m is the mass of the rocket, v_f is the final velocity, and v_i is the initial velocity.

From the given information, we have:

m = 2.77*10^6 kg

v_f = 56 m/s

v_i = 0 m/s

Using the kinematic equation for displacement:

y = v_i*t + (1/2)at^2

where y is the displacement (altitude), t is the time, and a is the acceleration.

We can rearrange this equation to solve for a:

a = 2y/t^2 = 2(510 m)/(20.0 s)^2 = 1.275 m/s^2

Then, we can use the kinematic equation for velocity:

v_f = v_i + at

v_f = 0 m/s + (1.275 m/s^2)(20.0 s) = 25.5 m/s

Now we can calculate the work done by the rocket:

Work done = (1/2)(2.7710^6 kg)(25.5 m/s)^2 - (1/2)(2.7710^6 kg)(0 m/s)^2 = 9.065*10^8 J

Finally, we can calculate the average power produced by the rocket:

Average power = Work done / Time taken = 9.06510^8 J / 20.0 s = 4.5310^7 W

Therefore, the average power produced by the rocket was approximately 4.53*10^7 W.

The answer is: 9.1∗10^8 W.

Explanation:

The magnitude of the next external force acting on the system is 0 N.

The mass of the construction vehicle is 2320 kg.

The collision is inelastic.

The initial momentum of the system is given by:

Pinitial = m1v1 + m2v2

where m1 and v1 are the mass and velocity of the car, and m2 and v2 are the mass and velocity of the construction vehicle.

Pinitial = (1120 kg)(25 m/s) + (m2)(6.25 m/s)

Pinitial = 28000 kg·m/s + 6.25m2

The final momentum of the system is:

Pfinal = (1120 kg)(7.45 m/s) + (m2)(8.45 m/s)

Pfinal = 8364 kg·m/s + 8.45m2

The change in momentum is:

ΔP = Pfinal - Pinitial

ΔP = 8364 kg·m/s + 8.45m2 - (28000 kg·m/s + 6.25m2)

ΔP = -19636 kg·m/s + 2.2m2

According to the impulse-momentum theorem, the change in momentum is equal to the impulse applied to the system. Since the system is isolated, the net external force acting on the system is zero. Therefore, the magnitude of the net external force is 0 N.

To calculate the mass of the construction vehicle, we can use the conservation of momentum principle. Since the system is isolated, the total momentum before the collision is equal to the total momentum after the collision.

The total momentum before the collision is:

Pinitial = m1v1 + m2v2

Pinitial = (1120 kg)(25 m/s) + (m2)(6.25 m/s)

Pinitial = 28000 kg·m/s + 6.25m2

The total momentum after the collision is:

Pfinal = (1120 kg)(7.45 m/s) + (m2)(8.45 m/s)

Pfinal = 8364 kg·m/s + 8.45m2

Setting these equal, we get:

Pinitial = Pfinal

28000 kg·m/s + 6.25m2 = 8364 kg·m/s + 8.45m2

Solving for m2, we get:

m2 = 2320 kg

To determine whether the collision is elastic or inelastic, we can calculate the coefficient of restitution, which is a measure of the "bounciness" of the collision.

The coefficient of restitution, e, is defined as the ratio of the relative velocity of separation to the relative velocity of approach:

e = (v2f - v1f)/(v1i - v2i)

where v1i and v2i are the initial velocities of the two objects, and v1f and v2f are their final velocities.

In an elastic collision, e = 1, meaning that the objects bounce off each other perfectly. In an inelastic collision, e < 1, meaning that some of the kinetic energy is lost and the objects stick together or deform.

Using the given velocities, we can calculate the coefficient of restitution:

e = (8.45 m/s - 7.45 m/s)/(25 m/s - 6.25 m/s)

e = 0.231

Since the coefficient of restitution is less than 1, the collision is inelastic.

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The average velocity of the skier is 13.3 m/min East.

option A.

Average velocity is a measure of how fast an object has moved over a given period of time in a specific direction.

It is calculated as the displacement of an object divided by the time interval during which the displacement occurs.

Displacement is the straight-line distance between the object's initial and final positions, in a specific direction.

The formula for average velocity is:

Average Velocity = Displacement / Time

Average velocity of the skier = ( 40 m - 0 m ) / ( 3 min )

Average velocity of the skier = 13.3 m/min east

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The National Weather Service, a combination of warm air river air & cold air from Alaska combined to produce a dusting of snow to mojave desert sections of Southern Californian valleys on Saturday.In San Bernardino County, Rancho Loma and Fontana experienced a rare snowfall on Saturday.

On March 1, 2023, a winter storm passed across the area, and snow and graupel were seen falling in Disneyland near Anaheim, California.According to Camacho, the extraordinary incident lasted for roughly 10 minutes.

Conditions in some areas of California are very hazardous.Communities in the Santa Barbara Mountains have been buried by seven feet of snow, and rescue workers are bringing medicine and food to stranded locals.

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smallest possible potential energy The potential energy of the cart began to rise once more as it advanced higher up the loop as it entered the loop, but it was never able to match its level at the top of the hill.

Potential energy is the energy that is held in reserve by an object due to its position or condition. Potential energy exists in objects like a spring stretched out, a bicycle on a hilltop, and a book held above your head.

On the other hand, kinetic energy is the energy of an object or a system's particles in motion .The most gravitational potential energy between the cart and the Earth was stored at the top of the hill, which was the tallest point on the ride where the cart was stationary. When the cart was at the top of the hill, it had the highest potential energy due to its position above the ground. As the cart began to move downhill, some of this potential energy was converted into kinetic energy, which increased the cart's speed.

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The vector described as "40 feet to the right" can also be expressed as a displacement vector. It represents the change in position of an object as it moves from one point to another.

Specifically, the vector denotes a horizontal displacement of 40 feet in the positive x-direction from the starting point.

Another way to describe the vector is to use a coordinate system. If we place the starting point at the origin (0,0) and define the x-axis to be the horizontal direction and the y-axis to be the vertical direction, then the vector can be represented as (40,0), where the first number corresponds to the x-coordinate and the second number corresponds to the y-coordinate. This notation emphasizes the fact that the vector has no vertical displacement, only a horizontal displacement of 40 feet.

Alternatively, we could describe the vector using magnitude and direction. The magnitude of the vector is simply its length, which in this case is 40 feet. The direction of the vector can be described as "to the right" or "in the positive x-direction." This notation is useful when comparing vectors with different magnitudes but the same direction or vice versa.

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If an object continues to accelerate, the speed of the object will also increase.

Acceleration is the amount by which a speed or velocity increases (and so a scalar quantity or a vector quantity).

The relationship between acceleration and speed is direct.

If the speed is increasing, the car has positive acceleration. When the car slows down, the speed decreases. The decreasing speed is called negative acceleration

Therefore, as the object continues accelerating, the speed increases.

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Answer:

Atmosphere

Explanation:

Hydrogen,

H

2

, is one of the lightest gases that can be found on Earth. The other gas is helium, and these two gases are both lighter than air, because they have a high degree of buoyancy.

This means that the air below it is pushing up with a greater force than the air above it is forcing it down.

The correct answer is D. The height of a dam is only one of many factors that determine its ability to produce electricity. Other important factors include the volume of water that can be held in the reservoir, the flow rate of the water, and the efficiency of the power generation equipment. Therefore, it is impossible to determine which dam has the ability to produce the most electricity based solely on its height.

There are many kinds of handwriting characteristics, but commonly used are around 12-16.

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Since the initial velocity of ball A was 3.3 m/s east and the velocity of ball A after the collision is 6.7 m/s east, the velocity of ball A after the collision is 3.7 m/s east.

Velocity is a vector quantity that measures the rate and direction of an object's motion. It can be determined by measuring the displacement of the object over a certain period of time. Velocity is usually expressed in terms of distance per unit of time, such as meters per second (m/s). In physics, velocity is a fundamental concept that is used to describe the motion of objects.

The velocity of ball A after the collision can be calculated using the conservation of momentum equation. The equation is as follows:

m1v1 + m2v2 = m1v1' + m2v2'

where m1 is the mass of ball A, v1 is the initial velocity of ball A, m2 is the mass of ball B, v2 is the initial velocity of ball B, m1' is the mass of ball A after the collision, v1' is the velocity of ball A after the collision, m2' is the mass of ball B after the collision, and v2' is the velocity of ball B after the collision.

In this problem, the equation is:

(0.62 kg)(3.3 m/s east) + (0.62 kg)(1.6 m/s west) = (0.62 kg)(v1') + (0.62 kg)(1.2 m/s east)

We can solve this equation for v1':

(0.62 kg)(3.3 m/s east) + (0.62 kg)(1.6 m/s west) = (0.62 kg)(v1') + (0.62 kg)(1.2 m/s east)

0.62(3.3 + 1.6) = 0.62v1' + 0.74

4.9 = 0.62v1' + 0.74

4.9 - 0.74 = 0.62v1'

4.16 = 0.62v1'

v1' = 6.7 m/s east

Since the initial velocity of ball A was 3.3 m/s east and the velocity of ball A after the collision is 6.7 m/s east, the velocity of ball A after the collision is 3.7 m/s east.

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Answer:

If the friction force on an object is -210 N and the net force acting on the object is 190 N, then we can use the formula:

Net force = Applied force - Friction force

Solving for the applied force, we get:

Applied force = Net force + Friction force

Substituting the given values, we get:

Applied force = 190 N + (-210 N)

Applied force = -20 N

Therefore, the applied force on the object is -20 N. This means that the direction of the applied force is opposite to the direction of motion of the object.

Explanation:

When a particle is projected at 36 m/s from ground,

a) Time for which it is above a height of 63 m is 2.8s

b) The speed for which it has at this height of 63 m is 7.82 m/s

c) total time of flight is 7.34s.

Velocity is "rate of change of displacement with respect to time".

i.e. v= dx/dt

it is also defined as displacement over time. i.e. v=Displacement/Time.

Velocity shows how much distance can be covered in unit time. It's SI unit m/s.

Acceleration is rate of change of velocity with respect to time.

i.e. a = dv/dt

if an object changes its velocity in short time, we can say that it has grater acceleration.

a= dv/dt =Δv/Δt

Given,

Initial velocity u = 36 m/s

Height of the particle s =  63m

acceleration due to gravity g=9.8 m/s²

a) According to equation of kinematics,

s=ut+1/2gt²

putting all the values in equation,

63=36t+(1/2)(-9.8)t²

multiplying by 2

126=72t-9.8t²

9.8t² -72t +126 = 0  

on solving this quadratic equation, we get

t=4.4s or t=2.8s

(Correct option is t=2.8s)

Hence time to attain 63 m of height is 2.8s

b)According to equation of kinematics,

v²=u²+2as

v² = 36²+2(-9.8)×63 (negative sigh is for velocity and acceleration are oppositely directed)

v² = 61.2

v= 7.82 m/s

Hence Speed at this height is 7.82 m/s

c) Total time of the flight is

at max position of height, final velocity v=0

v= u+at

0=36+(-9.8)t

t= 36/9.8

t = 3.67s .......this is time taken by particle to complete journey from bottom to top,

now it will take same time for particle to come from bottom to top.`

therefore total time taken by particle to go from bottom to top then return back is 2×3.67s

t= 7.34s

Hence total time taken by flight is 7.34s

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Answer:

The word is "wind".

Explanation:

The sentence would be:

"The sun is also the reason wind exists. The wind is moving air."

Hope this helped !

When the elevator is ascending at a constant speed of 2.1 m/s the scale will read 696.51 N.

What do you mean by speed?

Speed is a measure of how fast an object is moving, and is defined as the distance traveled per unit time. It is a scalar quantity, which means that it has only magnitude and no direction. The standard unit of speed in the International System of Units (SI) is meters per second (m/s).

Speed can be calculated using the following formula:

                    Speed = Distance / Time

When the elevator is ascending at a constant speed of 2.1 m/s, the scale will read the person's normal weight, which is the force exerted on the scale by the person's mass due to gravity.

This is because at a constant speed, the person and the scale are not experiencing any net acceleration, and so the force experienced by the person is the same as their weight.

The weight of the person is given by the formula:

Weight = mass x gravitational acceleration

where mass = 71.0 kg and gravitational acceleration = 9.81 m/s^2 (assuming the elevator is on Earth).

So the weight of the person is:

Weight = 71.0 kg x 9.81 m/s^2 = 696.51 N

Therefore, the scale will read 696.51 N.

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Answer:

Below

Explanation:

Blue ( 6)   OR  green ( 4)   is 10 out of  ( 6 + 5 + 5 + 4)

10 / 20 = 1/2 chance of blue OR green

Yes, the average hourly earnings in the United States have increased since 1980, both nominal wages and in real terms.

What are nominal wages?

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Yes, External forces can cause elastic materials to vibrate around them

What drives the external forces?

External factors are those brought on by an outside the system agent. Regardless of the place of application, an external non-zero net force causes the system's center of mass to accelerate. Internal forces are the forces that the system's objects trade.

A system's momentum is altered by an external source that exerts force on it. This may appear as a shift in the system's position, velocity, or acceleration.

An elastic material deforms in response to an external force, and internal resistance develops as a result of molecular cohesion. Within elastic bounds, the internal resistance's effort is stored as strain energy. Resilience is the term for this stress force.

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