Three students observe a toy car rolling across a level floor until it slows to a stop. After the observation, they make these statements: Max: "Energy is conserved, but friction turned it into heat, warming the floor and wheels." Chris: "But it stops. Energy is not conserved. The car's kinetic energy disappeared." Sam: "But energy can't just disappear. It must have become potential energy." Which student was correct?

Answer:

The Answer is D!

Explanation:

I checked it on Khan Academy.

The correct free body diagram of the hanging carrot is option B, where, the forces from two ropes and the net force acting upward and the gravitational force acting downwards.

A free body diagram is a representation of a body with different kinds of forces acting upon it with respect to its position and direction.

There are different kinds of forces namely magnetic force, tension force, nuclear force, gravitational force and the normal force  etc. The force acting on a massive moving body will be the product of its mass and acceleration.

The direction of each force acting upon a body will be different and the displacement also. Here, the carrot hanged by the two ropes will experience forces from both ropes which hangs it down but the force acting is upwards and thus the net force  is upward.

The gravitational force Fg acting on a body is always downward and thus the correct diagram depicting the free body of the carrot with forces is option B.

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Explanation:

Newton's third law states that " Every action has an equal and opposite reaction ".

Since, the Tension force acting on the rope is same.

So, the net force is the same everywhere along the entire rope.

Use Newton's third law to construct an argument that the net force is the same everywhere along the entire rope. The argument is tension force acting on the rope is same so net force is same.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Newton's third law states that " Every action has an equal and opposite reaction ".

Since, the Tension force acting on the rope is same.

So, the net force is the same everywhere along the entire rope.

The argument is tension force acting on the rope is same so net force is same.

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==>  The total mass resting on the table is (5 kg + 3 kg) = 8 kg.

==>  The total weight of that mass is (8 kg) x (9.8 m/s) = 78.4 newtons

==>  The boxes are stacked.  So the table doesn't know if the weight on it is coming from one box, 2 boxes, 3 boxes, or 100 boxes in a stack.  The table only knows that there is a downward force of 78.4 newtons on it.

==>  The table stands in a Physics classroom, and it soaks up everything it hears there.  It knows that every action produces an equal and opposite reaction, and that forces always occur in pairs.  

Ever since the day it was only a pile of lumber out behind the hardware store in the rain, the table has known that in order to maintain the good  reputation of tables all over the world, it must resist the weight of anything placed upon it with an identical upward force.  This is the normal thing for all good tables to do, up to the ultimate structural limit of their materials and construction, and it is known as the "normal force".

So the table in your question provides a normal force of 78.4 newtons. (d)

The displacement of the car is 180 m it traveled.

Displacement is the distance between two points in a certain direction. It is usually measured in terms of length, such as kilometers or miles. Displacement is a vector quantity, which means that it has both magnitude and direction. It is different from distance because displacement is the shortest distance between two points, while distance is the total amount of space traveled between two points. Displacement is commonly used in physics to calculate the change in position of an object over time. It can also be used to measure the change in velocity or acceleration of an object.

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Its a Conduction NO FOR REAL ITS A

Answer:

c, convection

Explanation:

edge 2020

93.64 grams

Explanation:mass of platinum =number of moles x molar mass molar mass = atomic mass of any element ,0.48 ×195.084 = 93.64 grams

The velocity of the water at the given points (2.0, 4.0) is approximately 5.06 m/s.

To find the velocity of the water at the point (2.0, 4.0), we need to calculate its components: the horizontal velocity (v_x) and the vertical velocity (v_y).

Given that v_x is constant at 5.0 m/s, the horizontal velocity component remains the same regardless of the position.

To find the vertical velocity component, we can differentiate the equation for the path of the water with respect to x:

y = 4.0 + 0.8x - 0.40x^2

Differentiating both sides with respect to x:

dy/dx = d/dx (4.0 + 0.8x - 0.40 \(x^2\))

= 0 + 0.8 - 0.80x

Now, substitute the x-coordinate of the point (2.0, 4.0) into the derivative:

dy/dx at x = 2.0 = 0.8 - 0.80(2.0)

= 0.8 - 1.6

= -0.8 m/s

Therefore, the vertical velocity component (v_y) at the point (2.0, 4.0) is -0.8 m/s.

To find the resultant velocity (v) at that point, we can use the Pythagorean theorem:

v = \(\sqrt{v_x^2 + v_y^2}\)

\(= \sqrt{5.0^2 + (-0.8)^2}\)

\(= \sqrt{25.0 + 0.64}\)

\(= \sqrt{25.64}\)

\(\approx 5.06 , \text{m/s}\)

Hence, the velocity of the water at the point (2.0, 4.0) is approximately 5.06 m/s.

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Answer:

40 seconds. 15,509/390=40.

P.s.

Can you please give me brainliest for my next rank.

Answer:

about 343 metres per second

Answer:

Solution given:

height [H]=25m

initial velocity [u]=8.25m/s

g=9.8m/s

now;

a. How long is the ball in flight before striking the ground?

Time of flight =?

Now

Time of flight=\(\sqrt{\frac{2H}{g}}\)

substituting value

b. How far from the building does the ball strike the ground?

Horizontal range=?

we have

Horizontal range=u*\(\sqrt{\frac{2H}{g}}\)

Examples of student-led organizations are:

The benefits of getting involved in any of these are many. They include but are not limited to:

Learn more about student organizations in the link below:

In order to avoid injury to driver, The force constant of this spring should be 73.82 N/m

Calculation of force constant to this spring:

Here  

vertical drop is 15 m.

mass of the car, m= 113 kg

gravitational acceleration, g= -9.8 m/s^2

spring compression before car stops, x= 3.0 m

In order to avoid injury to the driver,

we need to use Hooke's law and Newton's second law:

F(net) = F(x)

m*a=-k*x

here a=g

k= -(m*g) / x

here k is force constant of this spring

substituting the values we get,

k = -(113* -9.8) / (15)

k = 73.8266 N/m

Hence,  the force constant of this spring should be 73.82 N/m

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The particle moves to the right through a potential difference of Vb-Va =0.500 V. The correct answer is C.

We can use the relationship between the electric potential difference (V) and electric force (F) on a charged particle to identify the direction and potential difference through which the particle moves.

The equation describes the work an electric force does on a charged particle.

Fdcos = W∅

where ∅ is the angle formed between the force's direction and the particle's displacement, d is the distance traveled by the particle, and F is the electric force.

In this instance, the angle between the force's direction and the particle's displacement is zero since the particle is solely affected by the electric force and moves along the x-axis, and the work done by the electric force is represented by W = Fdx.

Therefore, Vb - Va = W/q, where q is the particle's charge, gives the potential difference between points a and b.

The work-energy principle stipulates that work done on a particle is equal to the change in kinetic energy, therefore we can say that the work done on the particle is equal to 1.60x10⁻¹⁹ J given that the particle's kinetic energy increases by this amount.

The sign of the potential difference can now be used to determine the force's direction because the electric force is provided by

F = -q(dV/dx).

Since the electric force is directed in the opposite direction to the direction the particle is moving because of the positive potential difference, the particle is moving to the right.

As a result, the particle goes to the right through a Vb-Va = 0.500 V potential difference.

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The chief disadvantage of multiple-staged launch vehicles is that it's hard to recover and re-use the spent stages.

This is because the stages are designed to separate during launch and fall back to Earth, making it difficult to recover and refurbish them for future launches.

Additionally, the cost of developing and producing multiple stages can be expensive, although it's not necessarily ten times more expensive than single-stage launch vehicles. While single-stage launch vehicles may have an advantage in terms of reaching orbit, multiple-staged vehicles can still be designed to efficiently and effectively reach orbit with the use of various propellants.

Overall, the biggest challenge with multiple-staged launch vehicles is the complexity of their design and the difficulty in recovering and reusing their components.

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Answer:

600 metres

Explanation:

1 minute = 60 seconds

1 second = 10 metres

60 seconds = 60 x 10 = 600

Athlete Mesert Defar runs 600 m in 1 minute. The speed of an object is equal to the distance traveled divided by time elapsed.

The speed of an object is equal to the distance traveled divided by time elapsed.

\(s = \dfrac dt \rm \ \ \ or\)

\(d = s \times t\)

Where,

\(d\) - distance

\(t\) - times = 1 minute = 60 sec

\(s\)  - speed = 10 m /s

Put the values in the formula,

\(d = 10 \times 60 \\\\ d = 600 \rm \ m\)

Therefore, Athlete Mesert Defar runs 600 m in 1 minute.

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she will be 30.7 m ahead of the intersection.

Physics equations called equations of motion describe how a physical system acts in terms of how its motion alters over time. The behavior of a physical system is described in further detail by the equations of motion as a collection of mathematical functions expressed in terms of dynamic variables.

We use equation of motion,

v² = u² + 2as

Here, v is final velocity of the body with u as the initial velocity of the body, a is acceleration of the body and s is distance covered by body.

She travels a distance of

= 18.2 x 0.350

= 6.37 m.

Therefore, she is [20 - 6.37] = 13.63 m from the intersection.

her car is able to decelerating at a rate of 3.65 m/s2

So,

u² = (18.2m/s)² - 2×(3.65m/s²)ss

u = 44.38m

She doesn't get stopped before the intersection.

∴ she is 44.38-13.7 = 30.7 m ahead of the intersection.

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Electric potential at 4m away would be 50 V.

Electric potential is nothing but a collections of charges, which effects travels in the form of electric rays.

we have formula for electric potential as below:

V = \(\frac{Kq}{r}\)

where, V is the electric potential.

q is the charge and r is the distance and K is the constant.

putting th evalues for the firat case,

100 = kq/2

kq = 200

again calculating for the 4 m distance

V = kq/r = 200/4 = 50 V

Hence the electric potential at the 4m away would be 50 V.

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Answer:

a=m/f

a=270/30

a=90

this is the correct answer

Answer:

In contrast, our atmosphere blocks most ultraviolet light (UV) and all X-rays and gamma-rays from reaching the surface of Earth. Because of this, astronomers can only study these kinds of light using detectors mounted on weather balloons, in rockets, or in Earth-orbiting satellites.

Explanation:

Answer:

Ultraviolet

Explanation:

Along with gamma rays and x-rays.

As a result, X heat required = 27Q is the amount of heat needed to raise the temperature.

first case

Q = Specific Heat * Density of Sphere* (4/3*pi*D^3) * (7-4)     -1

Second case

X = Specific Heat * Density of Sphere* (4/3*pi*(3D)^3) * (7-4)    -2

Dividing 1 and 2 we get

Q/X = 1/27

27

where Q is the amount of heat that is transported to or from the item, m is the object's mass, C is the material's specific heat capacity, and T is the resultant temperature change of the object.

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Explanation:

According to newtons first law of motion " A body is at a state of rest or uniform motion unless acted upon by a force (external)" which will either

1. change the direction

2. change the acceleration

3. change the velocity(moves or stop the body from moving)

4. change the shape or size

An object in motion, such as a car or a bird, has kinetic energy but not potential energy.

An object in motion has kinetic energy, but it doesn't necessarily have potential energy. Potential energy is the energy that an object possesses due to its position in a gravitational field or an electric field. An object that has the potential to move, but isn't moving, has potential energy. However, if an object is already in motion, it doesn't have the potential to move, and hence it doesn't have potential energy. This is because potential energy is directly proportional to an object's position or height above a surface with a gravitational or electric field.For instance, when a car is traveling down a road, it has kinetic energy, which is proportional to its mass and velocity, but it doesn't have potential energy because it's not at any height or position above the ground that can produce potential energy. Similarly, a bird that's flying through the air has kinetic energy because it's in motion, but it doesn't have potential energy because it's not above the ground or any surface with a gravitational or electric field.

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Answer:   Eat only when you're truly hungry instead of when you are tired, anxious, or feeling an emotion besides hunger.

Plan meals ahead of time to ensure that you eat a healthy well-balanced meal.

Keep more fruits, low-fat dairy products (low-fat milk and low-fat yogurt), vegetables, and whole-grain foods at home and at work.

Explanation:

Answer:

I know that some foods have a lot of sugar. I read online that I don’t need any more than 25 grams of added sugar a day. One kind of pop that I like to drink has 40 grams of sugar per can. I can start by drinking less pop. Next, I learned that some food makers are now putting nutrition keys on the front of their boxes. I love all kinds of breakfast cereal, so I can use the nutrition key to compare brands. Cereal high in fiber is good, but cereal high in sugar isn’t. I’ll be more careful, too, when ordering fast food. Sometimes fast-food places want to change the size of my order from medium to large for a higher price. From now on, I won’t pick the bigger meal. Picking the medium-sized meal should be better for me and can even save me money.

Explanation: Plato

The spring constant of an air-track glider attached to a spring is 16.3 N/m.

To find the spring constant using the following:

where:

Mass of the glider, m = 150 g = 0.15 kg

Amplitude of the oscillation, A = 9.8 cm = 0.098 m

Time for 12 oscillations, T = 18.0 s

The period of oscillation, T = 18.0 s / 12 = 1.5 s

The period of oscillation is related to the spring constant, k, and the mass of the glider, m, by the equation:

T = 2π√(m/k)

Solving for k:

k = m(2πT)²

k = 0.15 kg × (2π × 1.5 s)² = 16.3 N/m

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Apply Boyle's law:

P1 V1 = P2 V2 =P3 V3 = P4 V4

(33.3)(100) = P4 ( 12.5 )

3330 = 12.5 P4

3330/12.5 = P4

P4 = 266.4 kPA

Answer:

A. 266.4 kPa

Answer:

A (Crystallization of fish sauce)

Explanation for Answer:

The answer is A because the fish sauce is changing physical forms; it goes from being a liquid to a crystalized solid.

More Explanation on Physcal Changes:

Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.

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When a rightward moving car is skidding to a stop across the roadway with locked wheels, car will experience a decrease in velocity and come to a stop.

Option (c) is correct

When a car with locked wheels is skidding to a stop, the frictional force between the tires and the road is the primary force acting on the car. This force opposes the car's motion and causes it to slow down.

As the car's wheels are locked, there is no rolling resistance, and the only force opposing its motion is the kinetic friction between the tires and the road. This frictional force acts in the opposite direction to the car's velocity, decelerating it.

As the car continues to skid, the frictional force gradually reduces its speed until it comes to a complete stop. During this process, the car's kinetic energy decreases as it is converted into other forms of energy, such as heat generated by the friction between the tires and the road.

Ignoring air resistance, the car will eventually come to a stop as the frictional force brings its velocity to zero. Therefore, the correct option is (c)

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A rightward moving car is skidding to a stop across the roadway with locked wheels. (Ignore air resistance) Options:

a) The car will accelerate in the opposite direction.

b) The car will continue moving at a constant velocity.

c) The car will experience a decrease in velocity and come to a stop.

d) The car will start moving leftward.

Answer:

The rays do not polarize after reflection. The rays are dispersed after reflection. The rays are polarized after reflection.