A 10 kg box initially at rest is pulled with a 50 N horizontal force for 4 m across a level surface. The force of friction acting on the box is a constant 20 N. How much work is done by the 50 N force?

Minimum 14 times in a year is the time in which a full moon is observed from earth’s surface.

The Moon is not like Earth. It does not have oceans, lakes, rivers, or streams. It does not have wind-blown ice fields at its poles. Roses and morning glories do not sprout from its charcoal gray, dusty surface. Redwoods do not tower above its cratered ground.

Dinosaur foot prints cannot be found. Paramecium never conjugated, amoeba never split, and dogs never barked. The wind never blew. People never lived there—but they have wondered about it for centuries, and a few lucky ones have even visited it.

The lunar surface is charcoal gray and sandy, with a sizable supply of fine sediment. Meteorite impacts over billions of years have ground up the formerly fresh surfaces into powder. Because the Moon has virtually no atmosphere.

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According to the problem The barbell's mass is 178 kg.

What is barbell's mass ?

The mass of a barbell can vary depending on the size and type of barbell. Standard barbells typically range from 10 kilograms (22 pounds) to 45 kilograms (99 pounds). Olympic barbells are typically 25 millimeters (1 inch) in diameter and are available in weights ranging from 15 kilograms (33 pounds) to 25 kilograms (55 pounds). Barbells with a smaller diameter, such as a women's barbell, usually weigh between 5 kilograms (11 pounds) and 15 kilograms (33 pounds). Powerlifting barbells are thicker and longer than standard barbells and usually weigh between 20 kilograms (44 pounds) and 25 kilograms (55 pounds).

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Out of the given options, Natural gas is a non-renewable source of energy.

Energy sources are categorized into two types, renewable and non-renewable source of energy. renewable sources of energy are those which can be use more than once. like: wind energy, solar energy, and tidal energy, etc. On the other hand non-renewable energy cannot be used more than once. they got vanished after one use. They are one-time use energy sources. Some examples of non-renewable sources of energy are, natural gas, petrol, diesel, coal, etc.

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The speed of countershaft drive gear is 225 RPM.  To find it, you have to compare both STM value.

To calculate the the speed of countershaft drive, we use the formula of the surface teeth per minute (STM) where the formula is:

the surface teeth per minute (STM) = Speed x number of teeth

Because of the main drive gear is connected with the countershaft drive gear, the STM of both are equivalent. So.

Main gear speed x Main gear number of teeth = countershaft speed x countershaft  number of speed

35 teeth x 450 RPM = 70 teeth x "x" RPM

450 RPm = 2 x "x" RPM

x = 450 : 2 RPM

x  = 225 RPM

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Answer:

W =  - 16450 J  

Explanation:

Force of friction = - 329 N ( Friction acts opposite to the direction of motion )

Displacement = 50 m

W = F s

   =  - 329 × 50

W =  - 16450 J

∴ The work done by the force of the friction is - 16450 J .

The work done on the car to stop it by the frictional force of 329 N over 50 m is 16450 J.

Friction is a type of force which resists the motion of an object. Thus friction opposes the force that make the object moving. When a force is making a displacement on object or make it stop.

The work done in physics is the product of the force acting on it to stop or displace and the displacement.

Given  displacement = 50 m

friction  force = 329 N

Work done =  Force ×  displacement

                   = 329 N × 50 m = 16450 J

Therefore, the work done on the car by the frictional force to stop it is 16450 J.

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The force of an electron cannot be calculated directly. However, the force of an electron can be determined indirectly by measuring the electric field around the electron and calculating the force on the electron using the equation F=qE, where q is the charge of the electron and E is the electric field.

The electric field around an electron can be measured using various experimental methods. One of the most common methods is to use a laser to measure the electric field of an electron. This is done by shining a laser beam onto a charged particle and then measuring the intensity of light that is scattered from the particle.

The electric field of the electron can then be calculated from the measured intensity of the scattered light.

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Part other than hydrogen that acid contain- is called anion in dissolved form.

A Bronsted-Lowry acid or Lewis acid is a molecule or ion that can either donate a proton (the hydrogen ion, H⁺) or establish a covalent bond with an electron pair.

The proton donors, also known as Bronsted-Lowry acids, are the first class of acids. Proton donors, also referred to as Arrhenius acids, generate the hydronium ion H₃O⁺ under the unique situation of aqueous solutions. The Arrhenius theory was expanded upon by Bronsted and Lowry to take non-aqueous solvents into account.

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According to the question, the velocity of ball 2 after the collision is 30 m/s.

What is velocity?
Velocity is a vector quantity that describes the rate and direction of an object's motion. It is the displacement of an object over a period of time and is usually expressed in terms of distance (meters, feet, or kilometers) divided by time (seconds). It can also be expressed as the speed of an object in a particular direction. Velocity is a key factor in describing the motion of objects, as it accounts for both the speed and direction of an object's motion. It is an important concept in physics, and it is used to calculate forces and potential energy.

From the laws of conservation of momentum, the final velocity of ball 2 can be calculated as follows:

m1u + m2v = m1v1 + m2v2

0.2 x u + 0.2 x v = 0.2 x u + 0.2 x v2

v2 = u - (6N x 0.1s)/0.2kg

v2 = u - 30 m/s

Therefore, the velocity of ball 2 after the collision is 30 m/s.

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The distance between the director and the drum is 132 m.

Sound is a vibrate that move through a medium that can be solid, liquid or gas in the form of mechanical wave. In short, sound is an energy made by vibration. the intensity of the sound is decrease by the length of the travel it pass or we can say, the far the sound source from the listener, the minor the sound they can hear. The formula of the sound in correlation with time of hear and distance is time of hear = speed of sound : distance. As per data given, time of hear = 0.40s; speed of sound = 330 m/s. The distance will be:

time of hear = speed of sound : distance

0.40 = 330 : distance

distance = 330 : 0.40

distance = 132 m

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The mass of the object with a kinetic energy of 16,000 joules has a velocity of 8 m/s is 500kg.

Kinetic energy refers to the energy possessed by an object because of its motion, equal (nonrelativistically) to one half the mass of the body times the square of its speed.

Kinetic energy of a body can be calculated using the following formula:

K.E = ½mv²

Where;

According to this question, an object with a kinetic energy of 16,000 joules has a velocity of 8 m/s. The mass can be calculated as follows:

16,000 = ½ × m × 8²

16,000 = 32m

m = 16000/32

m = 500kg

Therefore, 500kg is the mass of the object.

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Answer: A vibrating object is the common source of wave.

Explanation:

The cause of all wave motion is a vibrating object. The motion of waves is caused by the vibrations of the substance they are made of, and these vibrations lead them to move in an oscillatory fashion.

For instance, when the air surrounding us vibrates, sound waves are created. On the other hand, charged particles that are oscillating, like they are in the antenna, produce electromagnetic waves.

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Answer:

The first one is tangent, second is tangential.

Answer:A 1000 kg car and a 2000 kg truck have the same momentum when the car is travelling at twice the speed of the truck, i.e. 38 m/s.

When a 1000kg car and a 2000kg truck have the same momentum, the speed of 1000 kg car is twice that of the  2000kg truck.

The product of a particle's mass and velocity is its momentum. Being a vector quantity, momentum possesses both magnitude and direction. According to Isaac Newton's second equation of motion, the force applied on a particle is equal to the time rate of change of momentum.

As  a 1000kg car and a 2000kg truck have the same momentum,

1000 kg × v₁ = 2000 kg × v₂

v₁ = 2v₂

Hence, the speed of 1000 kg car is twice that of the  2000kg truck.

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Answer:

As electrons move from higher energy levels to lower energy levels a photon (particle of light) will be given off. This is the process of emission.

Explanation:

electrons and photons also do this

Angular momentum and linear momentum are two physical concepts that have some similarities and differences. They are both measures of motion, but they describe different types of motion.

Similarities:

Differences:

The term angular momentum and linear momentum are similar in that they are both conserved and vector quantities, but they differ in that angular momentum describes rotational motion and linear momentum describes translational motion.

In summary, angular momentum depends on both mass and distance from the axis of rotation, while linear momentum depends only on mass and velocity.

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One minute has 60 seconds, One hour has 60 minutes and one day has 24 hours. Thus, 80 x 60 x 24 = 86,400 seconds in a day.

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A higher pitch siren is audible to this person. The sound waves become less frequent as they get more spaced apart as the police car moves off.

The distance between identical points (adjacent crests) in adjacent cycles determines how far a waveform signal has traveled in space or over a wire. In wireless systems, this length is frequently specified in meters (m), centimeters (cm), or millimeters (mm) (mm).

The wavelength, which is also the distance between two wave crests and troughs, is the measurement of wave length. In cycles per second (Hz), the term "frequency" refers to the number of vibrations that cross a specific area in a second (Hertz).

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The force of gravity which is the same as weight of the object is 11.8 N

Weight can be defined as a gravitational pull on any object in space under the influence of acceleration due to gravity. The force of gravity acting on an object is also known as weight.

To find the force of gravity acting on the 1.2 Kg rabbit, let us use the formula below

W = mg

Where

Substitute all the parameters

W = 1.2 × 9.8

W = 11.76 N

Therefore, the force of gravity acting on the 1.2 kg rabbit is 11.8 N approximately.

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A sculptor uses a constant volume of modeling clay to form a cylinder with a large height and a relatively small radius. The clay is molded in such a way that the height of the clay increases as the radius decreases, but it retains its cylindrical shape. At time t=c, the height of the clay is 8 inches, the radius of the clay is 3 inches, and the radius of the clay is decreasing at a rate of 12 inch per minute. The expression for the rate of change of the radius of the clay with respect to the height of the clay in terms of height h and radius r is dr/dh =- r/2h

The following formula determines a cylinder's volume:

V = πr²h,

where V is the volume, r is the cylinder's radius, and h is the cylinder's height.

In terms of height h and radius r, we must express the rate at which the clay's radius changes in relation to its height.

That means that height h and radius r are used to express dr / dh. To accomplish this, we must first compare the volume to the height, or find dV / dh:

V = πr²h

dv/dh = d/dh ( πr²h)

dv/dh =πr²+2 πrh dr/dh

The volume constance dV/dh = 0

dv/dh =πr²+2 πrh dr/dh

0=πr²+2 πrh dr/dh

-πr² =2 πrh dr/dh

dr/dh = - -πr² / 2 πrh

dr/dh =- r/2h

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Answer:

If there were no transformation of energy in the world, everything would come to a standstill.

Explanation:

Energy is required for all processes and interactions to occur, including movement and chemical reactions. Without energy, matter would not be able to move or change in any way. This would mean that living organisms would not be able to survive, as they rely on energy to carry out metabolic processes and maintain their body's functions.

The sun would not shine, the wind would not blow and the water would not flow, as they are all driven by energy transformations. The weather would not change, and there would be no seasons. The temperature would not vary and the weather patterns would not change.

Machines and technology would not work, as they also rely on energy to operate. There would be no electricity, transportation, or communication. The economy would come to a standstill as all the industry, trade, and commerce would stop.

In short, without energy transformation, the world would be a static, lifeless place, and life as we know it would not be possible.

Answer:

it is refracted

Explanation:

Wave B will be louder than wave A.

Let the amplitude of wave A be a1 and the amplitude of wave B be a2.

Similarly, let the loudness of wave A be L1 and the loudness of wave B be L2.

We know,

[tex]\frac{L1}{L2}[/tex] = [tex]\frac{a1^{2} }{a2^{2} }[/tex]

By substitution we see:

[tex]\frac{L1}{L2}[/tex] = [tex]\frac{3^{2} }{4^{2} }[/tex]

We get:

[tex]\frac{L1}{L2}[/tex] = [tex]\frac{9}{16}[/tex] .

Thus we see that the loudness of wave A is 9Hz while that of wave B is 16Hz. So we conclude that wave B is louder than wave A.

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The potential energy associated with the conservative force is +40 j. As the particle moves from a to b, the force does +25 j of work on the particle, all of which results in an increase in the kinetic energy only. Hence, the value of the potential energy at point b is -25J.

Given:

Mass of the particle= 0. 40 kg

Speed=10m/s

Initial workdone =+25J

Initial Potential enrgy=+40J

Now to find the value of the potential energy at point b use the following statement i.e.

∴ The change in potential energy of the given system is the -ve of the internal work done by the conservative force on the particle.

Hence,

ΔU=−W int

ΔU=-(+25J)

ΔU=-25J

Hence, -25Jis the value of the potential energy at point b.

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Answer:

16 m

Explanation:

(4 m/s)(t + 2 s) = (8 m/s)t

4t + 8 = 8t

8 = 4t

t = 8/4 = 2 sec

This means that after Car A has traveled for 4 sec, Car B catches up to it after it has traveled 2 s (having left 2 s after Car A).

Where do they meet up:

d = rt

Car B:  d = (8 m/s)(2 s) = 16 m

Car A:  d = (4 m/s)( 2 s + 2 s) = 16 m   **always check both equations to make sure your answer is correct

Answer:

The substance would of been frozen

Explanation:

A substance did not change its chemical nature in a reaction. Which most likely describes the reaction? It was frozen.

General physical appearance best describes the mineral habit.

External physical appearance, which a mineral tends to have is known as its habit. It may be long slender ones, blocky crystals, or aggregates of some type, etc.

Blocky crystal is a box-like or ball-like appearance.  Tabular crystal is just like a deck of playing cards(thick). Prismatic shape is like end faces are parallel to each other. They may be long, and short based on the ratio of length to lateral width ratio.

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When riding down a hill, the two types of energy which a moving bike has are kinetic energy and thermal energy.

Kinetic energy is the energy of motion, observable as the movement of an object or subatomic particle. Every moving object and particle have kinetic energy. Example of kinetic energy, such as: a race car speeding around the corner, a bicycle crushing down the hill, and students running home from the school.

Thermal energy refers to the energy contained within a system which is responsible for its temperature. Heat is the flow of thermal energy. An example of thermal energy is boiling water on the stove.

So, when riding down a hill, a bike has kinetic energy, and when brakes apply, the energy into thermal energy on the brake (heat).

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Follow my lead or ur answer is very wrong