A shopper is pushing a cart down a grocery store aisle. Starting from rest, the shopper applies a constant force to the cart for 4.0 s. From t = 4s until t = 4 s until t = 8 s, the shopper applies just enough force to balance the friction on the cart. Finally, the shopper applies a constant force to slow the cart until it comes to rest att = 12 s. The resulting position-time graph is shown below. What is the average acceleration of the shopping cart during its 12s motion?​

Answer:

F= mass× acceleration

14000 = mass × 5

mass= 14000÷5

mass= 2800

A body continues in its state of rest until it is acted upon by an unbalanced external force.

According to Newton's first law of motion, the reason for motion is the action of unbalanced forces. A body will continue in its state of rest or uniform motion unless it is acted upon by an unbalanced  external force. This law also referred to as the law of inertia.

Hence, an object will continue moving uniformly on a plane friction-less surface till the resultant force acting on it is not zero according to this law. Thus, the reason is an explanation for the assertion.

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Answer:

A hypothesis is a tentative statement about the relationship between two or more variables. is a specific, testable prediction about what you expect to happen in a study.

Explanation:

This is answer

Answer:

hey there

hypothesis is a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can test it. Scientists generally base scientific hypotheses on previous observations that cannot satisfactorily be explained with the available scientific theories

Explanation:

hope it helps

have a nice day : )

#Case -1

If Pulling force is less than frictional force the object won't move .

#Case-2

If Pulling force is greater than frictional force then object will be .

In order to calculate friction force you need Limiting friction first .

[tex]\\ \sf\longmapsto F_L=\mu sN[/tex]

Answer:

p = w/t = mgh/t = 60kg*7.2m*10.4sec/10.4 = 432 watt

Answer:

As position is the product of velocity and time, the area under the velocity-time curve will be the position.

Between 2 and 4 s, the area increases linearly to 20(4) = 80

Between 4 and 6 s, the additional area is 0(2) = 0

Between 6 and 8 s the area increases linearly by -10(2) = -20

which is a decrease.

In the angular-position vs time graph;  The angular position is derived from the area under the velocity vs time graph

Attached below is the angular position vs time graph

Given that : Angular position = Angular Velocity * time

As Time increases from 0 to 4 secs the area increases from 0 to 80 rad

As Time increases from 4 to 6 secs the area remains constant i.e. 0 rad

As Time increases from 6 to 8 secs the area under the graph decreases 80 to 60 rad

Hence we can conclude that the Angular position of the graph is derived from the area under the velocity vs time graph.

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Answer:

C. Gold

Explanation:

Why?

Because air , water, glucose is pure substance or liquid

Answer:

Hshahahjahajjajjajaisjsjs

Answer:

-1.5 m/s/s + (3.0 s + 2.0 m/s) = -7.5 m/s/s

-7.5 m/s/s x 3.0 s × 3.0 s × 3.0 s = - 202.5

Answer:

thanks thanks thanks thanks for your points

Answer:

Explanation:

The plane travels a distance of 200 m/s(20.0 s) = 4000 m

A 90° turn is π/2 radians

4000 = (π/2)R

R = 8000/π m

a = v²/R = 200²/8000/π = 5π m/s² ≈ 15.7 m/s²

When a airplane makes the graduall 90 turn at constant speed the average acceleration is 14.14 m/s.

Acceleration equals the change in velocity. The rate of change of velocity per unit time is called acceleration. The unit of acceleration is m/s². It represents the speed of the object along with direction.

Acceleration(a) = dv/dt, dv represents change in velocity and dt represents change in time. Velocity is defined as rate of change of position with time. Acceleration has both magnitude and direction and it is a vector quantity.

Acceleration is of two types- Instantaneous acceleration and average acceleration. Instantaneos acceleration gives the acceleration at that instant where as the average acceleration is obtained by rate of change of velocity with elapsed time.

Average acceleration = Δv / Δt.  Δv is the change in velocity and Δt is the elapsed time.

From the given,

An airplane makes 90° turn,

v₁ = 200 i^ (before 90 turn)

v₂ = 200 j^ (after 90 turn)

Δt = change in time

Average acceleration = Δv / Δt

                                   = v₂ - v₁ / 20

                                   =  200 i^  - 200 j^ /20

                     avg.acc    = 10(-i) + 10 (j)

| avg.acc | = √ 10(-i) + 10 (j)

                 = √2×10

                 = 14.14 m/s²

Hence, the average accleration is 14.14 m/s².

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Answer:

Для ответа на этот вопрос нужно открыть терадочку в том месте, где ты записывала определение материальной точки. На случай, если ты этот момент успешно проспала (что не стало бы сюрпризом), поясню - материальной точкой можно считать тело, размерами которого можно пренебречь. А теперь скажи мне, как можно измерить размер, которым пренебрегаешь?

Answer:

B

Explanation:

Answer:

F - The skin is the body's first physical barrier, hairs in the nose filter air as it enters the body, pores in the skin release toxins and pathogens

With lower, the mechanics have to work harder to give water. Resulting in faster spray. But with upper, they do not have to work as hard which makes it not work as fast.

Answer:20

Explanation:

[tex]A_x = 5.0[/tex]

[tex]A_y = -6.3[/tex]

1 newton / square metre =0.0001 newton / square centimetre

Formula = divide the pressure value by 10000

The force required to extend a rod increases as the cross sectional area

increases.

The rod that experiences the largest force is rod B

Reason:

The elongation of a rod by the application of a force is given by the

following formula;

[tex]\Delta L = \dfrac{F \cdot L}{A \cdot E}[/tex]

From the above equation, we have that the elongation is inversely

proportional to the cross sectional area, such that the extension of a rod by

a given force reduces as the cross sectional area of the rod increases.

Therefore, the force required to extend the length of a rod by a specific

amount increases as the cross sectional area of the rod increases,

indicating that the rod with the largest cross sectional area require the

most force and therefore, experiences the largest force.

The rod that experiences the largest force is the rod with the largest cross

sectional area, which is rod B

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Explanation:

the force to pull or push the block upwards (with the rope being parallel to the inclined plane) with 0 acceleration (moves with constant velocity) and therefore the tension on the rope is

Ft = m×g×sin(angle) + y×m×g×cos(angle)

force of gravity force of friction

down (down)

m = the mass of the object = 200kg

g = Earth's gravity acceleration = 9.8m/s²

y = the Greek letter mu, the coefficient of friction (it does not say "static" or "kinetic", I assume kinetic because the object is moving with a constant velocity, but it does not matter here) = 0.05

angle = 25 degrees

the result is N (Newton).

so, let's put the numbers into the equation and calculate :

200×9.8×sin(25) + 0.05×200×9.8×cos(25) =

≈ 828.33 N + 88.82 N ≈ 917.15 N

the closest answer option is B (936 N).

I don't know why there is this difference.

Answer:

The notable examples are metal bearings, with occasional lumps on the otherwise smooth surfaces catching against each other, and the flow of an electric

Conversions of Kinetic energy to and from potential energy in vacuum converts with very little loss. If you throw a rock up against gravity in a vacuum, that rock will reach a potential energy that is almost exactly equal to the initial kinetic energy. When the rock reaches its peak and comes back down, its kinetic energy will be almost exactly the same when it reaches the original altitude.

Answer:

Individual H2O molecules are V-shaped, consisting of two hydrogen atoms (depicted in white) attached to the sides of a single oxygen atom (depicted in red). Neighboring H2O molecules interact transiently by way of hydrogen bonds (depicted as blue and white ovals).

Answer:

Potential energy can transfer into other forms of energy like kinetic energy. Kinetic energy is energy an object has because of its motion. ... If released, as the ball moves faster and faster toward the ground, the force of gravity will transfer the potential energy to kinetic energy.

On a microscopic scale, conduction occurs as rapidly moving or vibrating atoms and molecules interact with neighboring particles, transferring some of their kinetic energy. Heat is transferred by conduction when adjacent atoms vibrate against one another, or as electrons move from one atom to another.

In steam engine , pistons remove some heat energy from hot gases and  then uses these moving pistons to power the device attached that is hooked up . This is how heat energy can be converted to kinetic energy.

Heat engine with their thermal energy can lift up weights or pumping water to a certain height is an example that how thermal energy can be used to move an automobile to higher altitude .

Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another.

In steam engine , pistons remove some heat energy from hot gases and the steam engine then uses these moving pistons to power the device attached that is hooked up . This is how heat energy can be converted to kinetic energy.

Similarly heat engine with their heat energy can lift up weights or pumping water to a certain height is an example that how heat energy can be used to move an automobile to higher altitude.

learn more about heat energy

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Answer:

1. S

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3.×

4.×

I hope this can help u