A 4000kg truck is parked on a 15.0∘ slope.

How big is the friction force on the truck?

Explanation:

Given that,

Acceleration of the treadmill, [tex]a=4.7\times 10^{-3}\ m/s^2[/tex]

Time, t = 5 min = 300 s

Acceleration is given by :

[tex]a=\dfrac{v-u}{t}[/tex]

(a) (v-u) is the change in speed.

[tex]v-u=a\times t[/tex]

[tex]v-u=4.7\times 10^{-3}\times 300[/tex]  

[tex]v-u=1.41\ m/s[/tex]

So, the change in speed of the treadmill is 1.41 m/s.      

(b) Initial speed of the treadmill, u = 1.7 m/s

The final speed is given by using equation as :

[tex]v=u+at[/tex]

[tex]v=1.7+4.7\times 10^{-3}\times 300[/tex]

v = 3.11 m/s

Hence, this is the required solution.

Answer:

Electric current is the flow of a charge

Explanation:

Electric current is defined as the flow of electric charges. Mathematically, it is given by :

[tex]I=\dfrac{q}{t}[/tex]

Where

q = electric charge

t = time interval

The SI unit of electric current is ampere. It is denoted by letter A. According to Ohm's law, electric current can be given by  voltage divided by resistance of the circuit. Hence, the correct option is (c) " Electric current is the flow of a charge ".                      

Egenuity says the answer is False ^-^

Answer: The given statement is false.

Explanation:

In the United states, both men and women are treated equally and like men, women also work for living.

Also women has the responsibility to do house hold chores so most of the time women are busy with their family or work. Hence, they do not get enough leisure time.

Therefore, the statement women in the United States have 10 hours more leisure time per week than men, is false.

Less heat would be removed from the refrigerator.

The box will travel 4.17 meters with a given coefficient of kinetic friction of 0.15 and with an initial speed of 3.5 m/s.

It is known as a force that acts between moving surfaces as kinetic friction. A force acting in the opposite direction of the movement of a body on the surface is felt. The coefficient of kinetic friction between the two materials will determine the size of the force.

It is simple to define friction as the force stopping a sliding item. Everything has kinetic friction, which impedes the motion of two or more objects. When an object desires to slide in one direction, the force acts in the opposing direction.

According to the question, the given values are :

Coefficient of kinetic friction, [tex]\mu[/tex] = 0.15

Initial speed, V(i) = 3.5 m/s

Final speed, V(f) = 0 m/s

F = ma and,

[tex]F_r[/tex] = ma

[tex]\mu F_r[/tex] = ma

[tex]\mu[/tex]g = a

a = 0.15 / 9.8

a = 1.47 m/s².

V²(f) = V²(i) + 2ad

d = [V²(f)- V²(i)] / 2a

d = 0 -(3.5)² / 2(-1.47)

d = 4.17 m

Hence, the box with travel 4.17 meters.

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Answer:

Absolute Zero

Explanation:

The lowest limit of thermodynamic temperature is called as absolute zero. By international agreement, on kelvin scale it is 0 K and on Celsius scale it is equal to -273.15° C. This is considered as the lowest possible temperature. At this temperature the particle vibration is minimum and no heat energy remain in the substance.

The strength of an ionic bond is best represented by lattice energy, which measures the energy required to separate one mole of a compound into gas phase ions. Factors that affect lattice energy include the magnitude of ionic charges and the size of the ions. Higher lattice energy indicates stronger ionic bonds.

The type of energy that best represents the strength of an ionic bond is known as lattice energy. Lattice energy is the energy required to separate one mole of a compound into its gas phase ions. This energy measurement is crucial because it reflects the strength of the electrostatic attraction between the ions in an ionic compound. The stronger this attraction, the greater the lattice energy, indicating a stronger ionic bond. Factors influencing lattice energy include the magnitude of the ionic charges and the size of the ions; higher charges and smaller ion sizes contribute to stronger ionic bonds due to closer ion proximity and stronger electrostatic forces.

Lattice energies are often calculated using the Born-Haber cycle, a process that accounts for all energetic steps in converting elements into an ionic compound. Higher lattice energy corresponds to stronger ionic bonds, which directly impacts the compound's physical properties, such as its melting point. For instance, a compound with high lattice energy will have a high melting point, affirming the strong ionic bonds holding the compound together.

The greater the force exerted by the engine of a car over a set distance, the greater the change in  momentum.

The definition of force in physics is: The push or pull on a massed object changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. A spring balance can be used to calculate the Force. Newton is the SI unit of force.

According to Newton's second law of motion:

Force = rate of change in momentum per unit time.

Hence, The magnitude of the change in momentum increases with the amount of force applied by a car's engine over a given distance.

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Final answer:

Instantaneous speed and instantaneous velocity are related but different concepts in physics. The instantaneous speed refers to the speed of an object at a specific instant in time, while instantaneous velocity includes both magnitude and direction. If the instantaneous speed of an object remains constant, its instantaneous velocity can change if there is a change in direction of motion. Similarly, if the instantaneous velocity remains constant, the instantaneous speed can change if the object accelerates or decelerates.

Explanation:

Instantaneous speed and instantaneous velocity are related but different concepts. Instantaneous speed refers to the speed of an object at a specific instant in time, while instantaneous velocity refers to the velocity of an object at a specific instant in time, including both magnitude and direction. Although the instantaneous speed of an object can remain constant, its instantaneous velocity can change if there is a change in direction of motion. For example, if an object is moving in a circular path at a constant speed, its instantaneous speed remains the same, but its instantaneous velocity constantly changes because the direction of motion is constantly changing.

Similarly, if the instantaneous velocity of an object remains constant, its instantaneous speed can still change if the object speeds up or slows down. This can occur when an object experiences an acceleration or deceleration. For example, if a car is moving at a constant velocity of 50 km/h and suddenly accelerates, its instantaneous velocity remains constant but its instantaneous speed increases.

Final answer:

The skater's velocity at his lowest point, where all his potential energy has been converted to kinetic energy, is approximately 3.96 m/s given his initial height of 8.0 meters and mass of 75 kg.

Explanation:

The question you're asking involves the principles of conservation of energy, particularly how potential energy is converted into kinetic energy. Since the skater starts at a height of 8.0 meters and ends at a height of 0 meters, all of the potential energy due to gravity would be converted to kinetic energy (assuming no air resistance and a frictionless surface). The potential energy at the start (PEstart) equals the kinetic energy at the lowest point (KElowest).

To find the velocity of the skater at the lowest point, we use the formula for gravitational potential energy (PE = mgh) and set it equal to the formula for kinetic energy ½ mv2, where 'm' is mass, 'g' is the acceleration due to gravity (9.81 m/s2), 'h' is the initial height, and 'v' is the velocity.

So, PEstart = mgh = KElowest = ½ mv2. Plugging in the values, we get 75 kg × 9.81 m/s2 × 8.0 m = ½ × 75 kg × v2. Solving for 'v', the velocity of the skater at his lowest point, we find that:

(75 kg × 9.81 m/s2 × 8.0 m) / (0.5 × 75 kg) = v2
(588.6 kg*m2/s2) / (37.5 kg) = v2
15.7 m2/s2 = v2
v = √(15.7 m2/s2)
v ≈ 3.96 m/s

Therefore, the skater's velocity at his lowest point is approximately 3.96 m/s.

Static electricity occurs when electrons are transferred between atoms, often triggered by friction (triboelectric effect). This effect can be observed in real-life examples such as rubbing a balloon against hair or the operation of a Van de Graaff generator. Materials' conductivity affects the ease of electron transfer and therefore, static electricity production.

Static electricity occurs because electrons, which carry negative charge, are relatively easy to scrape off or transfer between atoms. In everyday scenarios, static electricity is often produced by friction - a process scientifically referred to as 'triboelectric effect'. For instance, when you rub a balloon on your hair, the friction between the balloon and the hair can strip electrons off from your hair atoms. Consequently, the balloon becomes negatively charged and your hair positively charged, enabling them to attract each other due to the interaction of their opposite charges.

The behavior of static electricity can also be illustrated by the principle working behind the Van de Graaff generator. Inside it, electrons are transferred from one part to another through physical contact and motion, creating a build-up of static charge. This further causes the charges to repel each other and spread to the outer surface of the machine.

It's important to note that not every material conducts static electricity equally well. Conductors, such as metals, have free electrons that allow easy flow of electricity. Insulating materials, on the contrary, resist the flow of electricity due to the absence of free electrons.

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Answer : The correct option is, distance times force

Explanation :

Work : It is defined as the force acting on an object to cause a displacement. Or we can defined as the work is equal to the product of the force of an object and displacement of an object.

The formula of the work is written as,

[tex]W=F\times d[/tex]

where,

W = work done

F = force applied on an object

d = displacement of an object

Hence, the work is equal to distance times force.

Work is equal to distance times force in Physics. The force must be directly causing motion of the object for work to be calculated. For instance, pushing a box 5 meters with a force of 10 Newtons would result in 50 Joules of work.

In the field of Physics, work is defined as the force applied on an object times the distance that the object moves. In other words, work is equal to the product of distance times force. The force must be causing the object to move in the direction of the force in order for work to happen. For example, if you push a box 5 meters with a force of 10 Newtons, the work done would be 50 Joules (10 Newtons x 5 meters).

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Answer:

Gamma rays and its uses are discussed below.

Explanation:

Characteristics of Gamma rays

Uses of Gamma rays

In a water molecule, oxygen has the greatest electronegativity, leading to the polar nature of water and its ability to form hydrogen bonds.

Because oxygen has an electronegativity of 3.44 compared to hydrogen's 2.20, it attracts the shared electrons in the molecule more strongly than the hydrogen atoms do. Consequently, the shared electrons spend more time near the oxygen atom, resulting in a higher electron density around it and making the oxygen end of the water molecule slightly negative. This imbalance in electron density is significant, as it contributes to the molecular polarity of water, where hydrogen atoms acquire a partial positive charge and oxygen atoms a partial negative charge. The high electronegativity of oxygen relative to hydrogen in water molecules leads to its well-known polar properties and its ability to form hydrogen bonds.

Explanation:

A free body diagram shows all the forces acting on the object- all the magnitudes and the directions. The forces acting at an angle on an object are written in the form of their components in the horizontal and vertical direction.  The forces in the single direction are added up. Thus, a free body diagram shows the net force acting on an object.

The movement of electrons due to a difference in electric potential energy is the electric charge.

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The velocity of an object dropped from a height of 300m at the moment it hits the ground is approximately 77.46 m/s.

The subject of the question is on kinematics under gravity, also referred to as free-fall motion. Here, you are asked to find the velocity of an object just before it hits the ground, having dropped from a height of 300m.

We can use the equation of motion for this operation: v² = u² + 2gH, where v is the final velocity, u is the initial velocity, g is the acceleration due to gravity (approx 9.8 m/s²) and H is height. In this case, the object is dropped, meaning its initial velocity (u) is zero. Substituting the values, we have v² = 0 + 2*9.8*300. Solving this, we get v = sqrt(2*9.8*300) = 77.46 m/s (approx). This is the velocity of the object at the moment it hits the ground when it is dropped from a height of 300 m.

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Answer:

Explanation: B. A change in particle position

Answer: Option (B) is the correct answer.

Explanation:

Melting point is defined as the point at which a solid substance changes into liquid state.

During the melting point temperature of substance remains constant until the whole solid substance changes into liquid state.

At the melting point, particles of the solid vibrate rapidly and as a result position of the particles changes from one place to another.

Thus, we can conclude that as a solid reaches its melting point intermolecular bonds have been disrupted, causing a change in particle position.

In physics, a vector is a quantity that has both magnitude and direction. It can be represented by an arrow and is used to describe physical quantities such as displacement, velocity, force, and electric and magnetic fields.

In physics, a vector is a quantity that has both magnitude and direction. It can be represented by an arrow, where the length of the arrow represents the magnitude and the direction of the arrow represents the direction. Vectors are used to describe physical quantities such as displacement, velocity, force, and electric and magnetic fields.

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The initial velocity of the skydiver is 0 ft/s. After 5 seconds, the velocity is approximately 34.5 ft/s. After 15 seconds, the velocity is approximately 60.2 ft/s.

(a) To find the initial velocity of the skydiver, we need to evaluate v(t) at t = 0. Substitute t = 0 into the equation v(t) = A(1 − e^-kt) . Plugging in A = 64 and k = 0.19, we get v(0) = 64(1 - e^0) = 64(1 - 1) = 0 ft/s.

(b) To find the velocity after 5 seconds, substitute t = 5 into the equation. v(5) = 64(1 - e^(-0.19 * 5)) = 64(1 - e^(-0.95)) ≈ 34.5 ft/s .

To find the velocity after 15 seconds, substitute t = 15 into the equation. v(15) = 64(1 - e^(-0.19 * 15)) = 64(1 - e^(-2.85)) ≈ 60.2 ft/s .

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The initial velocity of the skydiver is 0 ft/s. After 5 seconds, the velocity is approximately 39.2 ft/s, and after 15 seconds, it is approximately 60.3 ft/s.

Let's solve the problem about the skydiver's velocity over time. The velocity function given is [tex]v(t) = A(1 - e^{-kt})[/tex] where A = 64 ft/s and k = 0.19 s⁻¹.

(a) Initial Velocity

The initial velocity of the skydiver occurs at t = 0. Plugging t = 0 into the velocity equation:

[tex]v(0) = 64(1 - e^{-0.19*0})[/tex]

Since e0 = 1:

v(0) = 64(1 − 1) = 0 ft/s

Therefore, the initial velocity of the skydiver is 0 ft/s.

(b) Velocity after 5 s and 15 s

Let's find the velocity after 5 seconds (t = 5):

[tex]v(5) = 64(1 - e^{-0.19*5})[/tex]

Calculating the exponent:

e-0.95 ≈ 0.387

So:

v(5) = 64(1 − 0.387) = 64(0.613) ≈ 39.2 ft/s

Now, let's find the velocity after 15 seconds (t = 15):

[tex]v(15) = 64(1 - e^{-0.19*15})[/tex]

Calculating the exponent:

e-2.85 ≈ 0.058

So:

v(15) = 64(1 − 0.058) = 64(0.942) ≈ 60.3 ft/s

Therefore, the velocities after 5 and 15 seconds are approximately 39.2 ft/s and 60.3 ft/s, respectively.

The correct answer to the question is : 2.976 miles/hour.

CALCULATION:

As per the question, the distance travelled by the bird X = 1000 miles.

 The time taken by the bird to cover that distance t = 2 weeks.

                                                                                     = 2 × 7× 24 hours

                                                                                     = 336 hours

We are asked to calculate the speed of the bird.

The speed of the bird is calculated as -

                         speed v = [tex]\frac{distance}{time}[/tex]

                                        = [tex]\frac{1000}{336}\ miles/hour[/tex]

                                        = 2.976 miles/hour                   [ans]

Hence, the velocity of the bird is 2.976 miles/hour.

If the number of loops in a coil of wire is increased on an electromagnet, the magnetic field strength of the coil will increase.

An electromagnet is a type of magnet that generates a magnetic field by using an electric current. Electromagnets are typically made of wire twisted into a coil. A current flowing through the wire produces a magnetic field that is concentrated in the coil's central hole.

When the current is switched off, the magnetic field vanishes. The wire turns are frequently wound around a magnetic core consisting of a ferromagnetic or ferrimagnetic material, such as iron; the magnetic core concentrates the magnetic flux, resulting in a stronger magnet.

As the current grows, so does the strength of the magnetic field. The coil's number of turns grows. An iron core creates a powerful electromagnet that is easily magnetized and demagnetized.

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