100 PTs HELP PLS MARKING BRANLIST TAKING TEST RN


John is running 4 m/s when he decides to make a final sprint to the finish line. He crosses the finish line 6 seconds later
running 8 m/s. What was his acceleration in the last 6 seconds of the race?

-1.33 m/s2

1.33 m/s2


0.67 m/s2

-0.67 m/s2

Answer:

7.5m/s

Explanation:

Law of conservation of momentum: momentum in a system before collision equals to that after collision/

5kg*3m/s=2kg*v

15kgm/s=2kg*v

v=7.5m/s

To make 4 amperes flow through a resistance of 20 ohms, 80 volts of voltage are required.

Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. In other words, the greater the voltage, the greater the current that flows through a given resistance.

The voltage required to make 4 amperes flow through a resistance of 20 ohms can be calculated using Ohm's law:

Voltage (V) = Current (I) x Resistance (R)

Therefore, V = 4 A x 20 Ω = 80 V

So, to make 4 amps flow through a resistance of 20 ohms, 80 volts of electricity are required.

To know more about the Resistance, here

https://brainly.com/question/4712184

#SPJ1

The time taken by the croissant before it strike on the head is 5.4 s

Lets assume the height of the man is 1.3 m

Given height of the Eiffel Tower is 144.3 m

So the distance croissant travel before it hits the man on the head

= 144.3 - 1.3 m

= 143 m

According to the Second Equation of Motion which relates distance with the acceleration and time, we can say that

\(S = ut + \frac{1}{2} a t^{2}\)

here u = 0

a = g = 9.81 m/s²

S = 143 m

therefore \(S = \frac{1}{2} gt^{2}\)

\(t = \sqrt{\frac{2S}{g} }\)

\(t = \sqrt{\frac{2 * 143}{9.81} }\)

\(t = \sqrt{29.154}\)

t = 5.4 s

Therefore, if the air resistance is neglected the croissant will drop 5.4 s before it tagged the man on his head.

To know more about Eiffel Tower,

https://brainly.com/question/28408197

#SPJ1

The statement that the terminal voltage of a DC generator decreases due to armature reaction effect and armature resistance voltage drop is true.

A shunt generator will build up its voltage when its field resistance is less than the critical value. When the field resistance is lower, it allows more field current to flow, resulting in a stronger magnetic field and increased generator voltage output.

A DC motor has a linear mechanical characteristic when it is shunt connected. In a shunt connection, the field winding is connected in parallel with the armature winding. This configuration allows for independent control of the field current, resulting in a more stable and linear mechanical response of the motor to varying loads.

The terminal voltage of a DC generator decreases due to the combined effects of armature reaction and armature resistance voltage drop. Armature reaction refers to the distortion of the magnetic field caused by the current flowing through the armature windings, which leads to a reduction in the generated voltage. Additionally, the resistance of the armature windings causes a voltage drop, further decreasing the terminal voltage of the generator.

To learn more about, resistance, click here, https://brainly.com/question/31367014

#SPJ11

A 18.5-cm-diameter loop of wire is initially oriented perpendicular to a 1.2-T magnetic field. The loop is rotated so that its plane is parallel to the field direction in 0.26 s ,the average induced emf in the loop is approximately -0.347 T·m²/s.

To calculate the average induced electromotive force (emf) in the loop, we can use Faraday's law of electromagnetic induction, which states that the induced emf is equal to the rate of change of magnetic flux through the loop.

Given:

The magnetic flux through the loop (Φ) can be calculated as:

Φ = B * A

where A is the area of the loop.

For a circular loop, the area can be calculated as:

A = π * r^2

The rate of change of magnetic flux (dΦ/dt) is given by:

dΦ/dt = B * dA/dt

Since the loop is being rotated, the change in area with respect to time (dA/dt) can be calculated as the rate of change of the area of a circle with radius r:

dA/dt = π * (2r * Δr/dt)

The average induced emf (ε) is then given by:

ε = -dΦ/dt

Substituting the values into the equations and solving:

A = π * r^2

= π * (0.0925 m)^2

≈ 0.0269 m^2

dA/dt = π * (2r * Δr/dt)

= π * (2 * 0.0925 m * 0.185 m/0.26 s)

≈ 0.289 m^2/s

dΦ/dt = B * dA/dt

= (1.2 T) * (0.289 m^2/s)

≈ 0.347 T·m²/s

ε = -dΦ/dt

≈ -0.347 T·m²/s

Therefore, the average induced emf in the loop is approximately -0.347 T·m²/s.

To learn more about induced emf (ε)  visit: https://brainly.com/question/13744192

#SPJ11

Answer:

   I = 2 A

Explanation:

Electric current is defined as the amount of face per unit of time

         I = Q / t

where Q is the charge and t is the time

let's reduce the time to the SI system

         t = 1 min (60s / 1 min) = 60 s

let's calculate

         I = 120/60

         I = 2 A

In the context of the system implementation phase of the Systems Development Life Cycle (SDLC), the riskiest form of installation is a plunge installation.

A plunge installation involves abruptly shutting down the old system and introducing the new system all at once. This approach can be highly risky because there is no gradual transition or fallback option if any issues arise with the new system. If unforeseen problems or errors occur during the implementation, the organization may face significant disruptions and potential loss of data or functionality. As a result, a plunge installation requires careful planning, thorough testing, and extensive preparation to mitigate risks and ensure a smooth transition to the new system.
The other installation approaches listed, such as immersion, pilot, parallel, and phased, involve more gradual and controlled transitions, allowing for a smoother implementation process and reduced risks compared to a plunge installation.

To know more about immersion, click here https://brainly.com/question/16988727

#SPJ11

Answer:

both statements are truth

Explanation:

a-The Joule effect, also called Joule's law, is the thermal manifestation of electrical resistance. ... In all these cases, it is intended to generate thermal energy with electricity passing through its conductors. This heat they give off is due to the Joule effect.

b-sure of a liquid tank depends only on the density of the liquid and depth from the free surface. It is a scalar quantity and is same in all directions, at a point.

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

However, it's proximity to the Sun means that its average orbital velocity is a speedy 47.362 kilometers a second or 29.429 miles per second – approximately 170,500 km/h; 105,945 mph. At this rate, it takes Mercury 87.969 days, or the equivalent of 0.24 Earth years, to complete a single orbit of the Sun.

The force F1 is equal and opposite to the downward force thus, F1 is equal to 60 N. The force F2 is inclined to 30 ° from leftward force and it is equal to 38.97 N in magnitude.

Force is an external agent acting on a body to deform it or to change its state of motion or rest. Force is a vector quantity and it is characterised by its magnitude and direction.

If two forces acting on a body from the same directions, then the net force will be the sum of these two forces. If they are acting from opposite directions, they will cancel each other in magnitude.

The force F1 is equal and opposite to the force acting downward. Thus its magnitude is 60 N. The force F2 is inclined to 30 ° from horizontal direction.

F2 = 45 cos 30 = 38.9 N.

To find more on force, refer here:

https://brainly.com/question/28875770

#SPJ1

The maximum corresponding percentage error in computing the cube's surface area is 7.8%. This error is due to the error in measuring the edge length of the cube, which can be at most 1 3%.

To find the maximum percentage error in computing the cube's surface area, we need to use the formula for the surface area of a cube, which is 6x^2, where x is the edge length. Since the edge x is measured with an error of at most 1 3%, we can assume that the measured value of x is x' = x(1 ± 0.013), where the ± sign depends on whether the error is positive or negative. Using this value of x', we can compute the surface area as S' = 6(x')^2. To find the maximum percentage error in S', we can take the derivative of S' with respect to x and multiply it by Δx/x, which is the percentage error in x. Doing this, we get a maximum percentage error of 7.8%, which means that the computed surface area can be off by at most 7.8%.

To know more about percentage error  visit:

brainly.com/question/30760250

#SPJ11

Explanation:

Domestic wiring is house wiring were phase/live wire,neutral wire,earth wire is used that functions in giving the electricity to our home except in case of neutral wire

When a star is so dense that its atoms have their electrons smashed in toward the nucleus (resulting in densities about a million times greater than water), the resulting material is called a Neutron star.

Stars are present in the galaxy that have the ability to generate their own light. They are both quite hot and very huge.

They are largely formed of hydrogen, with a trace of helium thrown in for good measure.

The sun is also a star, and its energy and light play an important part in the survival of all kinds of life on Earth.

When a star is so dense that its atoms have their electrons smashed in toward the nucleus (resulting in densities about a million times greater than water), the resulting material is called a Neutron star.

Hence the correct answer is a neutron star.

To learn more about the stars refer to the link;

https://brainly.com/question/24493066

#SPJ1

Answer: Circuit breakers and fuses have different parallel circuits

Explanation: That means that if one circuit gets overloaded (tripping the circuit breaker or blowing the fuse), it won't have any effect on the other circuits.

Answer:heheh it does, number 54

Explanation:

because number 36 Im WOULDNT be right

Match the volcano type with its correct

1. Cinder Cone:

Plate Tectonic Setting: Mostly Spreading Ridges, some Mantle Plumes

2. Composite/Stratovolcano:

Plate Tectonic Setting: Subduction Zones (Convergent Margins)

3. Shield Volcano:

Plate Tectonic Setting: Mostly Mantle Plumes, some Spreading Ridges

4. Large Igneous Provinces (LIPs):

Plate Tectonic Setting: Various tectonic settings

Volcano types can be associated with specific plate tectonic settings and magma compositions. Let's match the volcano types with their correct plate tectonic settings and magma compositions:

1. Cinder Cone:

Plate Tectonic Setting: Mostly Spreading Ridges, some Mantle Plumes

Magma Composition: Mafic

Cinder cones are typically small, steep-sided volcanoes that form from the eruption of basaltic magma. They are commonly found in volcanic regions associated with spreading ridges, where tectonic plates are moving apart, or in areas influenced by mantle plumes, such as hotspot volcanism.

2. Composite/Stratovolcano:

Plate Tectonic Setting: Subduction Zones (Convergent Margins)

Magma Composition: Intermediate, varies from felsic to mafic

Composite or stratovolcanoes are characterized by their steep slopes and alternating layers of lava flows and pyroclastic materials. They are commonly found in subduction zones, where an oceanic plate is being subducted beneath  continental plate. The magma composition of these volcanoes varies, ranging from felsic (high silica content) to mafic (lower silica content).

3. Shield Volcano:

Plate Tectonic Setting: Mostly Mantle Plumes, some Spreading Ridges

Magma Composition: Mafic

Shield volcanoes are large, broad, and gently sloping volcanoes that form from the eruption of basaltic magma. They are often associated with mantle plumes, such as those found in hotspot regions, as well as in volcanic areas influenced by spreading ridges.

4. Large Igneous Provinces (LIPs):

Plate Tectonic Setting: Various tectonic settings

Magma Composition: Mafic

Large Igneous Provinces (LIPs) are extensive regions of volcanic and intrusive rock formations that are associated with massive outpourings of mafic magma. They can occur in various tectonic settings, including continental rifts, hotspot regions, and flood basalt provinces.

5. Seafloor Volcanism, Pillow Lava:

Plate Tectonic Setting: Mostly Spreading Ridges

Magma Composition: Mafic

Seafloor volcanism is primarily associated with spreading ridges, where magma wells up and creates new oceanic crust. The lava erupted underwater cools rapidly, forming pillow-shaped structures known as pillow lavas. The magma composition is typically mafic, dominated by basaltic lavas.

These associations between volcano types, plate tectonic settings, and magma compositions provide insights into the geological processes and Earth's dynamics that shape the Earth's surface.

Learn more about magma composition here:

https://brainly.com/question/862669

#SPJ11

Answer is b

Explanation:

The photoelectric effect is the phenomenon where electrons are ejected from a metal surface when light of a certain frequency, called the threshold frequency, is shone on it. When electrons are ejected, they have kinetic energy and can be stopped by a potential difference applied across the metal. This potential difference at which the electrons are just stopped is called the stopping potential.

The stopping potential depends on the frequency of the light and not on its intensity because the kinetic energy of the ejected electrons depends on the energy of the incident photons, which is determined by the frequency of the light. Electrons require a minimum energy to escape from the metal surface, and this energy is proportional to the frequency of the light.

On the other hand, the intensity of the light determines the number of photons incident on the metal surface, but it does not affect their energy. Therefore, changing the intensity of the light does not change the stopping potential.

In summary, the stopping potential in the photoelectric effect depends on the frequency of the light because this determines the energy of the incident photons, whereas the intensity of the light does not affect the stopping potential because it only determines the number of photons incident on the metal surface.
In the photoelectric effect, the stopping potential depends on the frequency of the light but not on the intensity because of the following reasons:

1. The energy of individual photons is determined by their frequency, as per the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency. Higher frequency photons have higher energy and can more effectively eject electrons from the metal surface.

2. The stopping potential is the minimum voltage needed to prevent ejected electrons from reaching the anode, thus stopping the photoelectric current. As the energy of the ejected electrons is determined by the energy of the photons, the stopping potential will also depend on the frequency of the light.

3. The intensity of light affects the number of photons incident on the metal surface but not their individual energies. Increasing the intensity of light increases the number of electrons ejected but does not change the energy of each electron. Therefore, the stopping potential remains the same, even if the intensity of the light changes.

In summary, the stopping potential in the photoelectric effect depends on the frequency of the light, which determines the energy of the photons and thus the energy of the ejected electrons. The intensity of light does not affect the stopping potential as it only influences the number of electrons ejected, not their energies.

To know more about kinetic energy visit

https://brainly.com/question/999862

#SPJ11

We would need a volume of about 1.244 × 10³³ cubic light years of interstellar medium to gather enough atoms to make up the Sun.

The conclusion would be that an enormous volume of interstellar medium is required to gather the atoms required to form a star like our sun.

The interstellar medium has an average density of 1 atom per cubic cm (1 atom/cm³).

If our Sun is made up of about 10⁵⁷ atoms, we have to find out how large of a volume of the interstellar medium we would need in order to gather enough atoms to make up the Sun.

The required volume of interstellar medium is 2.524 × 10¹⁴ cubic light years.

To find the required volume of interstellar medium, we can use the following formula:

                    Volume = Mass/Density

Let's calculate the mass of the Sun using the given number of atoms.

                    Mass of the Sun = 10⁵⁷ atoms × 1.99 × 10⁻²⁷ kg/atom

                                                = 1.99 × 10³⁰ kg

Now, let's calculate the required volume of interstellar medium.

                     Volume = 1.99 × 10³⁰ kg / (1 atom/cm³ × 10⁶ cm³/m³ × 9.461 × 10¹² km³/m³)

                                   = 2.524 × 10¹⁴ km³

                                   = 2.524 × 10¹⁴ (3.26 ly/km)³

                                   = 1.244 × 10³³ ly³

Therefore, we would need a volume of about 1.244 × 10³³ cubic light years of interstellar medium to gather enough atoms to make up the Sun.

The conclusion would be that an enormous volume of interstellar medium is required to gather the atoms required to form a star like our sun.

To know more about mass of the Sun, visit:

https://brainly.com/question/31458396

#SPJ11

Answer:

Matter, Force

Explanation:

In scientific contexts, mass is the amount of "matter" in an object (though "matter" may be difficult to define) whereas weight is the force exerted on an object by gravity. Objects on the surface of the Earth have weight, although sometimes the weight is difficult to measure.

The mass of the object attached to the spring is approximately 0.119 kg.

To determine the mass of the attached object using the spring, we can utilize Hooke's Law, which states that the force exerted by a spring is directly proportional to the displacement of the spring from its equilibrium position.

Hooke's Law can be expressed as:

F = k * x

Where:

F is the force exerted by the spring,

k is the spring constant, and

x is the displacement of the spring from its equilibrium position.

The frequency of the spring's motion (f) can be related to the mass (m) and the spring constant (k) using the equation:

f = (1 / (2π)) * √(k / m)

Rearranging this equation, we can solve for the mass:

m = (k / (4π² * f²))

Given:

Spring constant (k) = 3 N/m

Frequency (f) = 0.8 Hz

Substituting these values into the equation, we get:

m = (3 N/m) / (4π² * (0.8 Hz)²)

Calculating this expression:

m ≈ 0.119 kg

Therefore, the mass of the object attached to the spring is approximately 0.119 kg.

To know more about equilibrium position visit:

https://brainly.com/question/30229309

#SPJ11

The mass attached to the spring is approximately 0.238 kg.

To find the mass attached to the spring, we can use the formula for the angular frequency (ω) of a mass-spring system:

ω = √(k / m),

where ω is the angular frequency, k is the spring constant, and m is the mass.

Given:

k = 3 N/m (spring constant),

f = 0.8 Hz (frequency).

First, let's convert the frequency from Hz to radians per second (rad/s):

ω = 2πf = 2π(0.8) ≈ 5.03 rad/s.

Now, we can solve the formula for m:

ω = √(k / m),

m = k / ω^2,

m = 3 N/m / (5.03 rad/s)^2.

Calculating the value:

m ≈ 3 N/m / (5.03 rad/s)^2 ≈ 0.238 kg.

Therefore, the mass attached to the spring is approximately 0.238 kg.

To know more about frequency, visit:

https://brainly.com/question/29739263

#SPJ11

This is an example of the ideal gas law, which is a combination of the three laws of thermodynamics.

The ideal gas law relates the pressure, volume, temperature, and number of particles in a gas:

PV = nRT

where;

When the car is driven, the friction between the tires and the road causes the tires to heat up. As the temperature of the air inside the tires increases, the gas particles move faster and collide more frequently with the tire walls, causing the pressure inside the tires to increase.

According to the ideal gas law, an increase in temperature causes an increase in pressure, assuming that the volume and number of particles remain constant. Therefore, the expansion of the tires due to heating is an example of the ideal gas law.

Learn more about ideal gas law here: https://brainly.com/question/12873752

#SPJ1

Answer:

4.1 km/m

Explanation:

The average speed=Total distance/total time

so

Total distance=25+40=65

Total time=4+12=16

so

the average speed is 65/76=4.1 km/m

Answer:  Distance is a scalar quantity and direction is not applicable.  We can use graphs to depict an object's change in position over time.  Create a large number line in the classroom by taping index cards on the floor or wall 1 meter apart.

Explanation: I really hope that was helpful.

Answer:

The frequency, 'f', of a wave is given by the speed, 'v' of the wave and the wavelength, λ, of the wave

f = v/λ

The frequency, 'f', of a wave is also given by the inverse of the period, 'T', of the wave which is the time it takes the wave to complete an oscillation or a cycle

f 1/T

Therefore, the variables to be known to determine the frequency of a wave includes either, the velocity and the wavelength of the wave or the period of oscillation (the wave cycle) of the wave

Explanation:

c. The amount of energy transferred between 2 groups of molecules at different temperatures.

Heat transfer is given with a difference of temperatures

Location of the ball is top of the circle and acceleration is 3g.

Since tension force is more, surely ball is having net force upward and hence, the location of the ball in this case is top of the circle.

Any object that moves in a circle has an acceleration vector towards the center of that circle. This is known as Centripetal acceleration.

total force/ net force when ball is top of the circle is sum of tension force and gravity force.

\(F_{net\) = T + mg

Because of this net force, there is centripetal acceleration towards the center.

so, T + mg = ma

2mg + mg = ma

3mg = ma

a = 3 × force of gravity

To know more about centripetal acceleration here

brainly.com/question/11324711

#SPJ4

Answer:

Newton's Third Law states that "For every action, there is an equal and opposite reaction." An example of this law is the following scenario:

Imagine you are pushing a heavy box across the floor. According to Newton's Third Law, the box will exert an equal and opposite force back on you, making it harder to push. The more force you apply to the box, the greater the force it will exert back on you. This reaction force is what makes it difficult to push the box. The same idea applies when jumping off a diving board or jumping on a trampoline - the force you apply to the board or trampoline is equal and opposite to the force it applies back on you.

When a body is positively charged, it implies that there is positive as well as negative charge in the body but the positive charge is more than negative charge.

Most of the materials that make up our world are composed of atoms, which are made up of a nucleus containing protons and neutrons surrounded by electrons. When an atom loses or gains electrons, it becomes positively or negatively charged, respectively. This is because the number of protons in an atom, which determines its atomic number and chemical properties, does not change.

When there are more protons than electrons, the atom becomes positively charged, and when there are more electrons than protons, it becomes negatively charged.Positive charge is the property of a material that has lost one or more electrons and therefore has more protons than electrons. Positive charges repel other positive charges, while negative charges attract positive charges.

To know more about neutrons visit:

https://brainly.com/question/31977312

#SPJ11