A 66 kg student traveling in a car with a constant velocity has a kinetic energy of 1. 1 104 J. What is the speedometer reading of the car in km/h?

The minimum coefficient of static friction required to prevent the box from sliding is μ > (a/g), which is option d).

In this scenario, the box is in a state of rest before the truck accelerates. Once the truck starts accelerating, a pseudo-force acts on the box in the direction opposite to the acceleration of the truck. In order for the box to not slide, the force of friction between the box and the flatbed of the truck must be equal to the maximum value of the static friction. This maximum value of static friction can be calculated using the formula:
\(f_{max}\) = μ\(_s\) * N
where \(f_{max}\) is the maximum force of static friction, μ\(_s\) is the coefficient of static friction, and N is the normal force acting on the box.
In this case, the normal force acting on the box is equal to its weight, which is given by:
N = mg
where m is the mass of the box and g is the acceleration due to gravity.
Now, we can set up an equation for the net force acting on the box in the direction of the truck's acceleration:
\(f_{net}\) = \(f_{friction}\) - \(f_{pseudo}\)
where \(f_{friction}\) is the force of friction, and \(f_{pseudo}\) is the pseudo force acting on the box.
Since the box is not sliding, \(f_{friction}\) = \(f_{max}\), and \(f_{pseudo}\) = ma, where a is the acceleration of the truck.
Substituting the values, we get:
μ\(_s\) * mg = m * a
Simplifying, we get:
μ\(_s\) = a/g

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The drift velocity (v) of charge carriers in a conductor is given by the following equation: v = I / (n \(\times\) A \(\times\) q).

v = I / (n \(\times\) A \(\times\) q)

where:

v is the drift velocity, measured in meters per second (m/s)

I is the current flowing through the conductor, measured in amperes (A)

n is the number of charge carriers per unit volume of the conductor, measured in per cubic meter (\(m^(-3)\))

A is the cross-sectional area of the conductor, measured in square meters (m^2)

q is the charge of a single carrier, such as an electron, measured in coulombs (C)

This equation relates the drift velocity of the charge carriers to the current flowing through the conductor, the number of charge carriers per unit volume, the cross-sectional area of the conductor, and the charge of a single carrier. The drift velocity represents the average velocity of the charge carriers as they move through the conductor in response to an applied electric field.

The number of charge carriers per unit volume (n) depends on the material of the conductor and the temperature. In metals, the charge carriers are typically electrons, and the number density is on the order of 10^28 to 10^29 electrons per cubic meter.

The cross-sectional area (A) of the conductor is the area of the cross-section of the conductor perpendicular to the direction of the current flow, and is a measure of the amount of material available for the charge carriers to move through.

The charge of a single carrier (q) is typically the charge of an electron, which is approximately 1.6 x \(10^{-19\) coulombs.

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A 1.2 kg ball moving due east at 40 m/s strikes a stationary 6.0 kg object. The 1.2 kg ball rebounds to the west at 25 m/s. What is the speed of the 6.0 kg object after the collision, the speed of the 6.0 kg object after the collision is 13 m/s.

To solve this problem, we can use the principle of conservation of momentum. According to this principle, the total momentum before the collision is equal to the total momentum after the collision, assuming there are no external forces acting on the system.

Let's denote the velocity of the 6.0 kg object after the collision as v.

Before the collision:

Momentum of the 1.2 kg ball = (mass of the ball) * (velocity of the ball) = (1.2 kg) * (40 m/s) = 48 kg·m/s

Momentum of the 6.0 kg object = 0 (since it is stationary)

After the collision:

Momentum of the 1.2 kg ball = (mass of the ball) * (velocity of the ball after the collision) = (1.2 kg) * (-25 m/s) = -30 kg·m/s

Momentum of the 6.0 kg object = (mass of the object) * (velocity of the object after the collision) = (6.0 kg) * v

According to the conservation of momentum:

Initial momentum = Final momentum

48 kg·m/s + 0 = -30 kg·m/s + (6.0 kg) * v

Simplifying the equation:

48 kg·m/s = -30 kg·m/s + (6.0 kg) * v

78 kg·m/s = (6.0 kg) * v

Dividing both sides by 6.0 kg:

v = 78 kg·m/s / 6.0 kg

v = 13 m/s

Therefore, the speed of the 6.0 kg object after the collision is 13 m/s.

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Answer: D

Explanation:

I took the quiz and B was wrong

Tetrachloromethane is the name given to the CCl4 chemical.

Structure of carbon tetrachloride chemically. The liquid CCl4 is transparent, nonflammable, and heavy. It evaporates quickly and has a distinctive sweet smell that is similar to that of chloroform. The term "volatile organic compound" refers to CCl4 (VOC).

The secondary prefix for four carbon atoms is tetra. The first prefix for chlorine is chloro. Meth represents the word's root, which is carbon. Tetrachloromethane, which may also be written as 1,1,1,1, is the name of the substance. a week ago With the chemical formula CCl4, carbon tetrachloride is an organochlorine chemical compound that goes by several different names.

covalent substance Since it has four non-polar covalent connections between carbon and chlorine, carbon tetrachloride (CCl4) is classified as a covalent molecule.

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Answer:

Yes, that is correct, although most velocity is calculated via m/s and therfore you would multiply your 3 hours by 60 twice. Much of the information given is irrelevant and just trying to confuse.

Explanation:

Inner Planets:

- Rocky

- Small

- Only 3 moons total

- Very close to each other (for space)

- Underweight

Outer Planets:

- Gassy oop-

- GIANT

- Over 200 moons total

- VERY far from each other

- Obese

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Good luck foe.

Lb.

At an atomic level, electrostatics is responsible for most of the physical phenomena that we encounter in our everyday life. Every object we see around us, such as chairs, buildings, and people, are made up of atoms, and every atom has electrons that are negatively charged, protons that are positively charged, and neutrons that have no charge.

Electrostatics is the study of electric charges at rest and of the forces and fields associated with these charges. Electrons are held in atoms by the attraction of the positive nucleus for the negative charge of the electrons. This attraction is known as electrostatic force. The protons in the nucleus are also held together by electrostatic forces, which are much stronger than those that bind electrons to the nucleus.
The forces between charged objects are governed by Coulomb's Law. This law states that the force between two charged objects is proportional to the product of their charges and inversely proportional to the square of the distance between them. If the charges have the same sign, the force is repulsive; if they have opposite signs, the force is attractive.
Electrostatic forces play an important role in many physical phenomena, such as the attraction of dust particles to a TV screen, and the Van de Graaff generator, which uses electrostatic forces to build up very high voltages.

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Answer:

n =1.33 revolutions

Explanation:

Uniform Circular Motion

The angular speed can be calculated in two different ways:

\(\displaystyle \omega=\frac{v}{r}\)

Where:

v = tangential speed

r = radius of the circle described by the rotating object

Also:

\(\omega=2\pi f\)

Where:

f = frequency

Solving for f:

\(\displaystyle f=\frac{\omega}{2\pi}\)

Since the frequency is calculated when the number of revolutions n and the time t are known:

\(\displaystyle f=\frac{n}{t}\)

We can solve for n:

n=f.t

The particle moves in a circle of r=90 m with a speed v=25 m/s. Thus the angular speed is:

\(\displaystyle \omega=\frac{25}{90}\)

\(\displaystyle \omega=0.278\ rad/s\)

Now we calculate f:

\(\displaystyle f=\frac{0.278}{2\pi}\)

\(f=0.04421\ Hz\)

Calculating the number of revolutions:

n = 0.04421*30

n =1.33 revolutions

The exiting electron has an energy of 6.03 x 10⁻¹⁹J

The photoelectric effect is the emission of electrons while electromagnetic radiation, which includes light, hits a material. Electrons emitted in this way are referred to as photoelectrons.

In keeping with the well-known Einstein explanation of the photoelectric impact: The electricity of the photon could be sum total of electricity needed to put off the electron and kinetic energy of the emitted electron. consequently h nu= W + E.

The photoelectric effect is the manner wherein the electricity from electromagnetic radiation, together with visible light, gamma radiation or different hits an atomic electron wherein the power of the radiation is transferred in its entirety to the electron causing the electron to be ejected from the atom.

Calculation:-

KE =  hv - work function

    = 6.626 × 10⁻³⁴ ×1.8 x 10¹⁵ - 5.9 x 10⁻¹⁹

    = 11.93 x 10⁻¹⁹ -  5.9 x 10⁻¹⁹

    = 6.03 x 10⁻¹⁹ J

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The matrix is ​​the set of extracellular materials that will form a certain tissue. Through this there will be a physiological integration of the cells.

In the matrix there will be different macromolecules, mainly collagen, enzymes, glycoproteins, among others which will give support to the cells that will be immersed in the matrix. It will also be involved in the process of cell multiplication and cell movement, since it will allow communication between the different cells to coordinate their cell functions.

The extracellular matrix is ​​going to be composed, broadly speaking, of two components: interstitial matrix and the basal membrane. The interstitial matrix is ​​one that will be formed by polysaccharides and fibrous proteins that gives it the characteristic to be able to cushion the compressions to which it may be subjected.

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Answer:

Select the crown at the bottom of an answer where the speech bubble icon is.

Answer:

Conduction is the transfer of heat between substances that are in direct contact with each other. ... Conduction occurs when a substance is heated, particles will gain more energy, and vibrate more. These molecules then bump into nearby particles and transfer some of their energy to them.

Explanation:

The most critical component determining the kinetic energy of a projectile is its mass.

The kinetic energy (KE) of a projectile is determined by various factors, but the most critical component is its mass.

The formula for kinetic energy is given by:

KE = (1/2) * m * v^2

Where KE is the kinetic energy, m is the mass of the projectile, and v is its velocity.

Mass (m): The mass of the projectile plays a crucial role in determining its kinetic energy. The greater the mass of the projectile, the higher its kinetic energy will be for a given velocity. This is because kinetic energy is directly proportional to the mass of an object. A heavier projectile will have more mass, and hence, more kinetic energy.

Velocity (v): While velocity also contributes to the kinetic energy, it is the mass that has a more significant impact. The velocity is squared in the kinetic energy formula, meaning that doubling the velocity will result in four times the kinetic energy. However, doubling the mass will also double the kinetic energy.

Considering the relationship between mass and velocity in the kinetic energy formula, it becomes apparent that mass has a more critical effect on determining the kinetic energy of a projectile. Increasing the mass of the projectile will have a greater impact on its kinetic energy compared to increasing its velocity.

Therefore, the most critical component determining the kinetic energy of a projectile is its mass.

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The Lunar Excursion Module (LEM) was designed to make a soft landing on the lunar surface, which required that the LEM must not bounce back into space upon impact. The LEM, therefore, was modeled as a mass that was supported by four symmetrically located legs.

Each of these legs could be approximated as a spring-damper system with negligible mass.The design of the springs had to be such that the total energy of the system was dissipated during the landing without causing any structural damage to the LEM. This is because the energy of the landing must not cause the spacecraft to bounce back into space.The design of the springs was also affected by the nature of the lunar surface. The lunar surface was not homogeneous and, therefore, the spacecraft had to be designed to deal with different types of soil and rocks.

This meant that the springs had to be able to adjust to different soil types and absorb the energy of the impact.In addition, the design of the springs was also affected by the lunar environment. The temperature on the moon fluctuates widely between day and night. Therefore, the springs had to be designed to withstand extreme temperatures without losing their resilience.

Finally, the design of the springs was affected by the mass of the spacecraft. The springs had to be able to support the weight of the spacecraft without collapsing while also being light enough to not add too much weight to the spacecraft. This meant that the springs had to be designed using lightweight and strong materials such as titanium alloys.

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1) when we light a matchstick,the energy which got consumed in while rubbing the matchstick against the surface,turns into heat and hence ,it lights , therefore,the energy gets transferred from one type to another which proves the law of conservation of energy.

2) The coal gets burn and generate into electricity which further used by us for various purposes like lighting lamp and since the energy gets transferred from one source to another instead of ceasing, it proves the statement of conservation of energy.

3) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will come to rest .

4) No ,it doesn't , because due to the force of friction,the disturbance in the movement of it ,takes place, making it stop at a specific point after some time.

5) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will eventually come to rest .

6)

7)

8) In the previous problem ,the kinetic energy increases as continues rolling and the potential energy decreases in this process of prolongation of the movement ,while ,when an object comes to rest after the process of moving or falling, it's potential energy is at the highest while the kinetic energy is just the opposite .

9)

10)

11)

In perfectly elastic collision, there's no loss of energy, hence ,the energy that got used up in the starting to bounce the ball ,will remain the same throughout the whole collision and the height would be the same 6 meters and kinteic energy would be 117.6J

Answer:

b

Explanation:

the solar system is smaller then nebula nebula is smaller then a galaxie and a galaxie is smaller then a universe

Answer:

On Edg 2021, the answer was "B = The moon's orbital period and distance from Earth"

Explanation:

I hope this is correct for you, if it isn't I am very sorry. Good luck! :)

Newton's principles of motion and the universal law of gravitation can be used to derive Kepler's third law. Make the centripetal force equal to the force of gravity. The following expression, which may also be written as P2=42a3GM, can be obtained by inserting an expression for the planet's velocity: GMr=4r2P2. Thus, option B is correct.

Newton demonstrated that the force that causes something to fall toward the ground, like an apple, is the same force that causes the moon to orbit the Earth. The Sun, as well as any other star and its satellites, are affected by this universal force.

Newtonian physics and Kepler's laws serve as the foundation for planetary motion and orbital laws. Because these fundamental rules govern everything in the cosmos, they also govern how planets and artificial satellites move.

Therefore, If two things experience the same acceleration when the same force is applied to them, then they have the same inertial mass. Newton's second law makes use of the same mass.

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We know that the Sun within our solar system is not a first-generation star born after the Big Bang because the Sun contains heavier elements.

A first-generation star is a star made of essentially only hydrogen and helium. First-generation stars are predicted to be enormous in size. They also live fast and die young.

An important component of stars is hydrogen gas. The nuclear fusion of hydrogen atoms produces the energy that sustains a star throughout its life. The nuclear fusion of hydrogen atoms also produces other elements including helium, carbon and oxygen.

Elements that the stars produce and that are heavier than hydrogen and helium are labeled metals. The Sun has been found to be metal-rich. This means it is at least a second-generation star.

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1.) The AMA is 2.5

2.) The VR is 5.

3.) The efficiency is 50%.

Given that the object has a weight of 250 N and the effort needed to push it up the ramp is 100 N, we can calculate the AMA as follows:

AMA = Load / Effort

AMA = 250 N / 100 N

AMA = 2.5

Therefore, the AMA is 2.5.

To calculate the VR, we need to find the distance moved by the effort and the distance moved by the load. The distance moved by the effort is the length of the ramp, which is 50 m. The distance moved by the load is the height it is raised, which is 10 m. Therefore, we have:

VR = Distance moved by effort / Distance moved by load

VR = 50 m / 10 m

VR = 5

Therefore, the VR is 5.

To calculate the efficiency, we need to find the work done by the load and the work done by the effort. The work done by the load is:

Work done by load = Load x Distance moved by load

Work done by load = 250 N x 10 m

Work done by load = 2,500 J

The work done by the effort is:

Work done by effort = Effort x Distance moved by effort

Work done by effort = 100 N x 50 m

Work done by effort = 5,000 J

Therefore, the efficiency is:

Efficiency = (Load x Distance moved by load) / (Effort x Distance moved by effort)

Efficiency = (2,500 J) / (5,000 J)

Efficiency = 0.5 or 50%

Therefore, the efficiency is 50%.

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Answer:

A. 4.5 x 10^-5 kg.m2

B. 108 x 10^-3 kg.m2

C. 54 x 10^-5

Explanation:

A. I = m(r^2)

point mass m = 0.005 g = 5 x 10^-6 kg

I = (5 x 10^-6 kg) x (3 m)^2 = (5 x 10^-6 kg) x 9 m^2 = 4.5 x 10^-5 kg.m2

B. I = m(r^2)

point mass m = 0.3 kg = 3 x 10^-1 kg

I = (3 x 10^-1 kg) x (0.6 m)^2 = (3 x 10^-1 kg) x 0.36 m^2 = 108 x 10^-3 kg.m2

C. KE = 1/2I(w^2)

KE = 1/2(3 x 10^-2 kg.m^2)(0.6 rad/s)^2 = 54 x 10^-5

Answer:

Given that

speed u=4*10^6 m/s

electric field E=4*10^3 N/c

distance b/w the plates d=2 cm

basing on the concept of the electrostatices

now we find the acceleration b/w the plates  to find the horizontal distance traveled by the electron when it hits the plate.

acceleration a=qE/m=\(1.6*10^{-19}*4*10^3/9.1*10^{-31} =0.7*10^{15}\)=\(7*10^{14}\) m/s

now we find the horizontal distance traveled by electrons hit the plates

horizontal distance

\(X=u[2y/a]^{1/2}\)

=\(4*10^6[2*2*10^{-2}/7*10^{14}]^{1/2}\)

=\(3*10^{-2}\)= 3 cm

The magnetic field of an electromagnet can be strengthened in the following ways.

Increasing the current through the coil. The magnetic field's strength is inversely proportional to the current through the coil. The magnetic field of electromagnet will get stronger as the current increases.

Increase the number of wire turns in the coil to increase the magnetic field's strength.

By inserting a ferromagnetic core, such as iron, inside the coil, the magnetic field's intensity can be greatly increased.

Reducing the space between the coil and the core. The magnetic field gets stronger as the space between the coil and the core gets smaller.

Expanding the coil's surface.

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Answer:

Explanation:

is this marked??

(a). The car's average velocity between t = 1.0s to t = 1.5s will be - \(1\;m/s\)

(b). The car's acceleration at t = 1.5s will be - \(0.4\;m/s^{2}\)

(c). Car's speed is increasing with time.

We have a a remote controlled toy car that starts from rest and begins to accelerate in a straight line.

We have to determine -

        t = 1.0 s  to  t = 1.5 s.

The rate of change of velocity with respect to time is called Acceleration. Mathematically -

\($a=\frac{dv}{dt}\)

According to the question, we have the following data for the Car -

t = 0s → x = 0m

t = 0.5s → x = 0.1m

t = 1.0s → x = 0.4m

t = 1.5s → x = 0.9m

t = 2.0s → x = 1.6m

PART - A

The car's average velocity between t = 1.0s to t = 1.5s will be -

\($v_{avg} = \frac{0.9-0.4}{1.5-1}= 1 m/s\)

PART - B

Velocity at t = 1.5 s will be -

\($v(1.5)=\frac{0.9}{1.5}= 0.6\;m/s\)

The car's acceleration at t = 1.5s will be -

\($a(1.5) = \frac{v}{t} = \frac{0.6}{1.5} = 0.4\;m/s^{2}\)

PART - C

Since, the acceleration of the car is positive, this means that the car is accelerating in the forward direction. Hence, its speed is increasing with time.

[ The following data was missing in your answer. The complete question would include this data also -

t = 0s → x = 0m

t = 0.5s → x = 0.1m

t = 1.0s → x = 0.4m

t = 1.5s → x = 0.9m

t = 2.0s → x = 1.6m ]

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Answer:

Gravity creates stars and planets by pulling together the material from which they are made.

Explanation: Thats the only thing i have im stuck on the tga quiz

Answer:

T = 486.6 K

Explanation:

The final temperature of the block can be found using the following formula:

\(Q = mC\Delta T\\\)

where,

Q = Thermal Energy Transferred = 3.35 x 10⁵ J

m = mass of aluminum block = 2 kg

C = Specific Heat = 897 J/kg.K

ΔT = Change in Temperature = T - 300 K

T = Final Temperature of the Block = ?

Therefore,

\(3.35\ x\ 10^5\ J = (2\ kg)(897\ J/kg.K)(T-300\ K)\\\\5.38\ x\ 10^5\ J + 3.35\ x\ 10^5\ J = (1794 J/K)(T)\\\\T = \frac{8.73\ x\ 10^5\ J}{1794\ J/K}\)

T = 486.6 K

If Shelley's cup of tea cools 1/2 of a degree in 10 minutes, the rate of her tea cooling down is 0.05 degrees per minute.

10 minutes = 1 / 2 degrees

1 minute = 1 / 2 / 10 degrees

1 minute = 1 / 20 degrees

1 minute = 0.05 degrees

If a value is given for x amount of a factor, to calculate for unit amount of the factor, divide the value by the value of x. Similarly, if a value is given for unit amount of a factor, to calculate for x amount of factor, multiply the value by x.

Therefore, the rate of her tea cooling down is 0.05 degrees / minute.

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