14. A 75 kg BASEBALL PLAYER RUNS AT A VELOCITY OF 10 m/s TO GET TO SECOND BASE. IN
ORDER TO GET TO THIRD BASE QUICKLY SHE INCREASES HER SPEED TO 12 m/s.
DETERMINE THE WORK DONE BY THE BASEBALL PLAYER.
A. 1650 J
B. 1550 J
C. -1650 J
D. -1550 J

The potential energy of a 25 kg bicycle resting at the top of a hill 3 m high will be 735 J

potential energy = m*g*h

where

m = mass

g = acceleration due to gravity

h = height

potential energy = 25 * 9.8 * 3 = 735 J

The potential energy of a 25 kg bicycle resting at the top of a hill 3 m high will be 735 J

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Answer:

|F| = 393750  N

Explanation:

Given that,

Total mass of the train, m = 750000 kg

Initial speed, u = 84 m/s

Final speed, v = 42 m/s

Time, t = 80 s

We need to find the net force acting on the train. The formula for force is given by :

F = ma

\(F=\dfrac{m(v-u)}{t}\\\\F=\dfrac{750000\times (42-84)}{80}\\\\F=-393750\ N\)

So, the magnitude of net force is 393750  N.

Answer:

Explanation:

A simple pendulum consists of a mass (usually represented as a small object or bob) attached to a string or rod of negligible mass. The mass is free to swing back and forth under the influence of gravity.

In the figure, the point of suspension is denoted by "O," and the mass (bob) is represented by the small circle. The string or rod is represented by the vertical line connecting the point of suspension to the bob.

Amplitude:

The amplitude of a pendulum refers to the maximum displacement or swing of the bob from its equilibrium position. In the figure, the amplitude can be represented by the angle formed between the vertical position and the position of the bob when it swings to its maximum distance on one side. It is usually denoted by the symbol "A."

Effective Length:

The effective length of a pendulum refers to the distance from the point of suspension to the center of mass of the bob. It represents the distance over which the mass swings back and forth. In the figure, the effective length can be measured as the length of the string or rod from the point of suspension to the center of the bob. It is usually denoted by the symbol "L."

It is important to note that the amplitude and effective length of a simple pendulum affect its period of oscillation (the time taken for one complete swing). The relationship between these parameters and the period can be described by mathematical formulas.

Overall, the simple pendulum is a fundamental concept in physics and provides a simplified model for understanding oscillatory motion and the principles of periodic motion.

The granules on the surface of the Sun appear to be plasma boiling because of convection processes which occurs within the solar plasma. Convection is the transfer of heat from the movement of a fluid, Here it is from the plasma within the Sun.

The interior region of sun is very hot causing the plasma to heat and rise the temperature towards the sun. As the plasma rises it causes  upwellings or convective cells which carries heat and energy from interior to the surface which results in boiling of granules.

The granular pattern seen on the Sun's surface is because of the rising plasma's magnetic and thermal fields. The darker regions within the granules are downdrafts, which are pockets of somewhat cooler plasma that are reserve in the interior protion of the plasma. The Sun's surface is constantly changing, and this dynamic convection process plays a crucial role in sustaining both its energy output and magnetic activity.

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Answer:

60m/s

Explanation:

Whenever two objects are moving in opposite direction the relative speed is obtained by adding the speeds of the two objects.

Here the two vehicles are moving with speed 20m/s and 40m/s .

So the relative speed of the car relative to that of the truck will be,

(40 + 20 ) m/s

60m/s

hope this helps!

Answer:

Horsehair, cotton, or linen

Explanation:

A electric ring with a impedance of 6 ohms needs 9 volts to generate a power of 1.5 amps.

The electromotive force is measured in units known as volts, which express the electric strain or the charge difference between two sites. Voltage is represented by the writings V or E. The electromotive force between two places is measured in volts.

Ohm's Law can be used to fix this matter. As according Ohm's Law, the voltage (V) equals the current (I) times the resistance (R):

V = I * R

Inputting the values provided output:

V = 1.5 amps * 6 ohms

V = 9 volts

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Please find attached photograph for your answer. Hope it helps. Please do comment

Answer:

hope this help pls give me brainless

The speed of the volleyball with a mass of 0.28 kg and height of 12 m will be 15.336 m/s.

Speed is the rate of change of distance of an object with respect to time. Speed is a scalar quantity as it has only magnitude and no direction. The SI unit of speed is meter per second (m/s).

PE = KE

Potential Energy = Kinetic energy

mgh = 1/2 mv²

where, m is the mass of object,

g is the acceleration due to gravity,

h is the height of the object,

v is the speed of the object

gh = 1/2v²

2gh = v²

v = \(\sqrt{2gh}\)

v = \(\sqrt{2(9.8)(12)}\)

v = \(\sqrt{235.2}\)

v = 15.336 m/s

Therefore, the speed of the volleyball will be 15.336 m/s.

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Answer:

256782

Explanation:302-320+3223

Answer:

true

Explanation:

they can cause skin damage

Answer:

drawing of ear step by step

The objects with a speed higher v = 7668 m/s than that number are likely to go into orbit. (Y & Z)

The orbital speed of an astronomical body or object (e.g. planet, moon, artificial satellite, spacecraft, or star) is the speed at which it orbits around either the barycenter or if one object is much more massive than the other bodies in the system, its speed relative to the centre of mass of the most massive body.

The term can be used to refer to either the mean orbital speed, i.e. the average speed over an entire orbit, or its instantaneous speed at a particular point in its orbit.

Maximum (instantaneous) orbital speed occurs at periapsis (perigee, perihelion, etc.), while minimum speed for objects in closed orbits occurs at apoapsis (apogee, aphelion, etc.).

In ideal two-body systems, objects in open orbits continue to slow down forever as their distance to the barycenter increases.

g = v^2 / r

so v = square root ( r x g )

v = 7668 m/s will be the minimum speed needed to go into orbit.

Based on that, objects with a speed higher than that number are likely to go into orbit. (Y & Z)

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Image orientation is the placement or direction of an object in relation to its reflection in a mirror. When setting up the mirror across the center of a fresh piece of paper, it's essential to ensure that the mirror is perpendicular to the paper's surface.

This will ensure that the reflection of the object in the mirror is true, i.e., the image will not be distorted. Once the mirror is in place, an object triangle is drawn in front of the mirror. The object's triangle should be placed such that its base is on the mirror line, and the vertex is pointing away from the mirror. Once the triangle is drawn, its reflection in the mirror is observed.

The base of the triangle is still on the mirror line, and the vertex still points away from the mirror. When labeling the triangle, it's essential to label both the object triangle and the image triangle, distinguishing between the two triangles. Thus, when setting up a mirror, it's important to ensure it is perpendicular to the paper, draw the object triangle, observe the image triangle, and label both the object triangle and the image triangle. These steps are crucial when studying image orientation.

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The technique that Hubble used to discover Hubble's Law was spectroscopic redshift.

Hubble's Law, formulated by astronomer Edwin Hubble in the 1920s, describes the relationship between the recession velocity of galaxies and their distance from Earth. It states that the recessional velocity of a galaxy is directly proportional to its distance from us.

To measure the distances and recession velocities of galaxies, Hubble used the spectroscopic redshift method. Spectroscopic redshift involves analyzing the light emitted by galaxies and measuring the shift in the wavelengths of specific spectral lines towards longer wavelengths (redshift) compared to their rest wavelengths. Hubble observed that the light from distant galaxies exhibited a redshift, meaning that the spectral lines were shifted towards longer wavelengths. By measuring the extent of this redshift, he could determine the velocity at which the galaxies were moving away from Earth. Hubble then compared these recession velocities with independently measured distances to various galaxies, often using Cepheid variable stars as standard candles. Through his analysis, he discovered a clear linear relationship between recession velocity and distance, which became known as Hubble's Law.

By utilizing spectroscopic redshift measurements and combining them with distance determinations, Hubble provided compelling evidence for the expansion of the universe and established a fundamental principle of modern cosmology.

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Answer:

translational energy

Explanation:

because is diatomic

Answer:

The most likely items to be used are;

Ultrasound and X-rays

Explanation:

A routine visit to a dentist consists of two areas of activities, including;

a) Dental examination and check up

b) Oral prophylaxis, and dental cleaning

The dental examination may involve the use of X-rays, which allow the detection of cavities between the teeth

The dental cleaning can be carried out with the use of an ultrasound cleaner, which allow the cleaning of sensitive teeth without hurting the patient

Therefore, the items most likely to be used during a routine dental visit are ultrasound and X-rays

Answer:

ultrasound and x-rays

Explanation:

The net force acting on the wagon at a constant speed is 0.

The value of the force of friction acting on the wagon is 55 N.

The net force acting on the wagon is calculated by applying Newton's second law of motion as shown below.

F - Ff = ma

where;

At a constant speed, the acceleration of the wagon = 0

F - Ff = 0

F - Ff = F(net)

Thus, the net force is zero, when the speed of the wagon is constant.

The force friction acting on the wagon if the force on the wagon increased to 30 N is calculated as;

F - Ff = 0

( 30 N + 25 N ) - Ff = 0

Ff = 55 N

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ANSWER:

1st option: left

STEP-BY-STEP EXPLANATION:

Direction is the location of something in relation to something else. Direction can be described in relative terms, such as up, down, in, out, left, right, forward, backward, or sideways. L

A motion map can look like this:

Which means that by saying backwards, on the map it has a movement to the left

So the correct answer is the 1st option: left

Answer:

Sodium and water

Explanation:

We are given with the word equation :

sodium + water + sodium hydroxide + hydrogen

It is required to find that the reactants of the above equation.

In terms of chemical formula we can write it as :

\(Na+H_2O\rightarrow NaOH+H_2\)

Reactant of a chemical equation are the elements that are present on its LHS. These are the components of which the equation is composed of. So, the reactants of the given equation are sodium and water.

The reactant are :

-Reactants are Sodium and water.

-Hence, option b is correct.

Word equation :sodium + water + sodium hydroxide + hydrogen

In terms of chemical formula ,we can write it as :

\(Na+H_2O\rightarrow NaOH+H_2[/tex

Reactants In a chemical equation, reactants are the elements that are present on its LHS(left hand side).

So, the reactants of the given equation are sodium and water.

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If the lead can be extracted with 92.5 efficiency, the mass of ore is required to make a lead sphere with a 7.00 cm radius is 17.707 kg.

To find the mass of ore, the given values are,

The radius of the lead sphere is r = 7.0 cm,

The lead can be extracted with, η = 92.5% = 0.925 efficiency.

Density is the substance's mass per unit of volume.

We know the density of lead as,

⇒ p = 11.4 g/cm³ .

The volume of the lead sphere is,

V = 4/3πr³

   = 4/3π(7)³

V = 1436.7 cm³.

Mass of the lead present in the lead sphere is,

m = p . V

    = 11.4  × 1436.7

    = 16379 g

m = 16.379 kg

From the expression of efficiency, we calculate the mass of the ore,

η = Mass of lead obtained / Mass of the ore to be taken

0.925 = 16.379 kg / Mass of the ore to be taken

Mass of the ore to be taken = 17.707 kg

If the lead can be extracted with 92.5 efficiency, the mass of ore is required to make a lead sphere with a 7.00 cm radius is 17.707 kg.

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Answer:

silver

Explanation:

It is because it contains a higher number of movable atoms ( free electrons)

Answer:

A. planet < solar system < galaxy < universe

Explanation:

The universe is all the existing space, so it is formed by galaxies which are set of stars that hold together. This starts from solar system because they are surrounding by planets and other objects.

Therefore, the order form smallest to largest is

A. planet < solar system < galaxy < universe

If you have fewer than three data points/values, you cannot remove any of them as an outlier (i.e., the Grubbs test is irrelevant).

The Grubbs test is a statistical method used to detect outliers in a dataset.

It is based on the assumption that the data follow a normal distribution. The test identifies extreme values that deviate significantly from the mean of the dataset.

To perform the Grubbs test, you need a minimum number of data points. Specifically, you need at least three data points to calculate the test statistic and determine if any values should be considered outliers.

If you have fewer than three data points, it is not possible to perform the Grubbs test because there are not enough data points to analyze and identify outliers. In such cases, the test becomes irrelevant since there are no values to evaluate for potential outliers.

Therefore, if you have fewer than three data points or values in your dataset, the Grubbs test cannot be applied, and the concept of outliers becomes irrelevant in this context.

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a. Kinetic Energy = 49j

b.  Potential Energy= 147 j

c. Mechanical Energy = 196 j

Kinetic energy of an object is the energy that it possesses due to its motion which is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.

a. Kinetic Energy = 1/2 * m * v^2,

KE = 1/2 * 3kg * (7m/s)^2 = 49 J.

b. Potential Energy  = m * g * h,

PE = 3kg * 9.8 m/s^2 * 5m = 147 J.

c. Mechanical Energy  = KE + PE,

ME = 49 J + 147 J = 196 J.

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Taking into account the definition of kinetic, potencial and mechanical energy, if a 3kg ball 5m in the air is moving at 7m/s, the kinetic energy is 73.5 J, the potential energy is 147.15 J and the mechanical energy is 220.65 J.

Kinetic energy is the energy possessed by a body or system due to its movement.

Kinetic energy is defined as the amount of work necessary to accelerate a body of a certain mass and in a position of rest, until it reaches a certain speed. Once the final speed is reached, the amount of kinetic energy accumulated will remain constant, that is, it will not vary, unless another force acts on the body again.

Kinetic energy is represented by the following expression:

Ec = 1/2×m×v²

Where:

Gravitational Potential Energy is the energy that an object possesses due to its position in a gravitational field and represents the potential that an object has to do work as a result of being located in a particular position within that gravitational field.

For an object with mass m, at height h, the expression applied to the gravitational energy of the object is:

Ep= m×g×h

Where:

Mechanical energy is that which a body or a system obtains as a result of the speed of its movement or its specific position, and which is capable of producing mechanical work. This is:

Potential energy + kinetic energy = total mechanical energy

The principle of conservation of mechanical energy indicates that the mechanical energy of a body remains constant when all the forces acting on it are conservative (a force is conservative when the work it does on a body depends only on the initial and final points and not the path taken to get from one to the other.)

In this case, you know:

Replacing the definition of kinetic energy:

Ec = 1/2×3 kg× (7 m/s)²

Solving:

Ec= 73.5 J

The kinetic energy is 73.5 J.

You know:

Replacing in the definition of potential energy:

Ep= 3 kg× 9.81 m/s²× 5 m

Solving:

Ep= 147.15 J

The potential energy is 147.15 J.

Being:

the mechanical energy can be calculated as:

Potential energy + kinetic energy = total mechanical energy

147.15 J + 73.5 J = total mechanical energy

Solving:

220.65 J = total mechanical energy

The mechanical energy is 220.65 J.

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The answers include the following below:

This is referred to as the propagation of disturbances from place to place in a regular and organized way and there are different types of waves.

An example is the longitudinal wave which has the vibration of the particles takes place in the same direction as that of the wave.

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Answer:

\(8.5\frac{m}{s}\)

Explanation:

Use Kinematics:

\(v = v_0 + at\)

\(v = 3 + 1.1 * 5\)

\(v = 8.5 \frac{m}{s}\)