You push on a large box with 120 N of force, but it doesn’t move. How large is the friction force?

Answer: slow revolution and fast rotation

Solar system has 8 planets. 4 inner rocky planets - Mercury, Venus, Earth and Mars and 4 outer gaseous planets - Jupiter, Saturn, Uranus and Neptune.  The outer planets have few common features.

They are gaseous. There  period of revolution is larger than the inner planets which means that they have slow revolution about the Sun. One day on the outer planets is smaller than the inner planets which means they have fast rotation.

For example, Jupiter has revolves around sun in 11.86 Earth years and rotates about axis in 9.8 Earth hours. Uranus revolves around sun in 84 Earth years and rotates on its axis 17.9 Earth hours.

fast rotation

slow revolution

This is possible due to inertia of motion. which is nothing but newton's first law.

according to this law , an object tries to retain its state of motion or rest unless acted upon by an external force.  

consider an object placed on a paper, initially both the object and paper are at rest. to pull the paper , we apply force on the paper and paper gains velocity. but the object keeps its motion of rest and hence the paper can be removed without moving the object.

Technician A is Correct.

You can see this when he says that conductors have more free electrons than insulators. This statement is True.

While Technician B says that, insulators have the lower resistance than conductors. This statement is False.

The answer is Solvent. The reason is in the wording, 'the substance that does the dissolving.' A solvent does the dissolving, a solute is something that can be dissolved.

Answer:

solvent

Explanation:

Answer: Option (c) is the correct answer.

Explanation:

When two or more small nuclei combine together to form a larger nuclei then this process is known as nuclear reaction.

The smaller is an atom, the more energy it requires to release an electron. This energy is known as binding energy.

Thus, when two small nuclei fuse together then there will be more binding energy as compared to when two large nuclei fuse together.

For example, fusion of two hydrogen atoms release more energy then one helium atom, and upon binding excess energy is released into the space.

Hence, we can conclude that energy is released in a nuclear fusion reaction based on mass-energy equivalence because for small nuclei, the binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus.

Final answer:

Energy is released in a nuclear fusion reaction because the mass of the original nucleus is greater than the mass of the products. This is due to mass-energy equivalence and the conversion of mass into energy.

Explanation:

In nuclear fusion reactions, energy is released because the mass of the original nucleus is greater than the mass of the products. This is based on the concept of mass-energy equivalence, as described by Einstein's equation E=mc². The missing mass in the reaction is converted into energy, and the products of the fusion reaction have a greater binding energy per nucleon (BE/A). Therefore, the larger nucleus formed in the fusion reaction has a greater binding energy and less mass per nucleon, resulting in the release of energy.

The height of the ball above the ground is 38.45 m

First we will calculate the velocity of the ball when it touch the ground by using first equation of motion

v=u+gt

v=0+9.81×2.8

v=27.468 m/s

now the height of the ground can be calculated by the formula

v=√2gh

27.468=√2×9.81×h

h=38.45 m

It will most likely expand when hot and contract when cold.

When a concrete road is heated by energy from the Sun, the Concrete will most likely expand.  If no expansion joints have been provided during construction, then it will eventually crack.

it is 55 mph that is ok

Final answer:

The average speed of a car that traveled 330 miles in 6 hours is calculated by dividing the distance by the time, resulting in an average speed of 55 mph.

Explanation:

To calculate the average speed of the car, we need to divide the total distance travelled by the total time taken for the trip. In this case, the car travelled 330 miles in 6 hours.

The formula for average speed is:

Average Speed = Total Distance ÷ Total Time

Inserting the given values into the formula:

Average Speed = 330 miles ÷ 6 hours = 55 miles per hour (mph)

This means the car's average speed was 55 mph on that particular trip.

Answer

The ways are;

• By commercializing low earth orbit

• By supporting water purification efforts worldwide

• By bringing space station ultrasound equipment on earth

• By improving eye surgery with space hardware

Explanation

There is a revolutionary commercial pathways that is currently opening access to space.For example, NASA is purchasing commercial cargo resupply to space station which enable U.S business to develop a competition in selling services to others while freeing NASA resources for deep space exploration. Using  technology developed in space, the Water Security Corporation has deployed systems using NASA water-processing technology to ensure drinkable water availability for human survival. Medical care in remote regions is now  facilitated by use of small ultrasound units, tele-medicine  and remote guided methods similar to those used in space. The Eye Tracking Device experiment has enable researchers to have an insight into corrective laser surgeries.

Answer:c

Explanation:

let the tension force in the rope attached to the sledge be "T"

θ  = angle of rope with the horizontal = 40 deg

X = horizontal component of tension force "T" = 100 N

horizontal component of tension force "T" is given as

X = T Cosθ

100 = T Cos40

T = 130.54 N

Y = vertical component of the tension force = ?

vertical component of the tension force is given as

Y = T Sinθ

inserting the values

Y = (130.54) Sin40

Y = 83.91 N

Acceleration is defined as rate of change in velocity

So we can write its formula as

[tex]a = \frac{v_f - v_i}{t}[/tex]

here we know that

[tex]v_f[/tex] = final velocity = 56 m/s

[tex]v_i[/tex] = initial velocity = 7.6 m/s

t = time interval to change the velocity = 3 s

now we will plug in all values in the above equation

[tex]a = \frac{56 - 7.6}{3}[/tex]

[tex]a = \frac{48.4}{3}[/tex]

[tex]a = 16.13 m/s^2[/tex]

so here roller coaster will accelerate at rate of 16 m/s^2 and hence correct answer is "option d"

Answer:

The height of the cliff in meters = 27.44

Explanation:

 The potential energy of a body is given by the expression, PE = mgh, where m is the mass of the body, g is the acceleration due to gravity value and h is the height of the body.

 Here we have mass of rock = 13 kg

                          Potential energy = 3500 J

                          Acceleration due to gravity  = [tex]9.81m/s^2[/tex]

                          Substituting   3500 = 13 * 9.81 * h

                                                       h = 27.44 meter

      The height of the cliff in meters = 27.44

ATP is the primary energy currency of the body, providing the energy needed for various processes, including muscle contraction, nerve impulses, and metabolic functions.

Energy for daily tasks is primarily derived from the food we consume. The body breaks down carbohydrates, fats, and proteins from our diet through digestion.

These macronutrients are then converted into a molecule called adenosine triphosphate (ATP) through cellular respiration, occurring in the mitochondria of our cells.

ATP is the primary energy currency of the body, providing the energy needed for various processes, including muscle contraction, nerve impulses, and metabolic functions. So, when we do chores, go to school, or play sports, it's the result of our cells producing and utilizing ATP to power these activities.

Proper nutrition and a balanced diet are essential to ensure a steady supply of energy for our daily lives.

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The gravitational force between two objects is directly proportional to the products of the masses and inversely proportional to the square of the distance between them.

The law of universal gravitation defines the gravitational force between two objects.

Using the Formula :

[tex] F = \frac{m_{1}m_{2}}{r^{2}}[/tex]

From the formula ;

Therefore, the product of the masses are directly proportional and the inversely proportional to the square of the distance apart.

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According to Newton's law of gravitation, the gravitational force between two objects is directly proportional to the products of the masses and inversely proportional to the square of the distance between them.

Mathematically, the formula for expressing Newton's law of gravitation is calculated as [tex]C \alpha\frac{Mm}{r^2}[/tex]

If the proportionality sign is removed, we will introduce a constant known as gravitational constant to have: [tex]C =\frac{GMm}{r^2}[/tex]

Hence based on the formula, the complete statement will be the gravitational force between two objects is directly proportional to the products of the masses and inversely proportional to the square of the distance between them.

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Given:

u(initial velocity)=0

v(final velocity)=31.4ft/s=9.57m/s

time taken to cover the distance=1.2 s

Now we know that

v = u + at

Where v is the final velocity

u is the initial velocity

a is the acceleration

t is the time taken to cover the distance

Substituting the given values in the above formula we get

v= u + at

9.57=0+ ax1.2

a=26.17 m/s^2

The dependent variable in an experiment is also called the responding variable, as it responds to changes in the independent variable.

In the context of an experiment, the dependent variable is also known as the responding variable. This is because it is the variable that responds to the changes made to the independent variable, which is referred to as the manipulated variable due to it being purposefully altered by the researcher. Other variables in the experiment, known as control variables, are kept constant so they do not affect the outcome of the dependent variable.

Yes, According to law of conservation of energy the total energy of any system remains conserved (same).

Example.

If a body is placed at some height it possesses some potential energy.

As P.E =mgh

When this body is starting moving downwards its height becomes decreases so P.E decreases but at the same time it is moving I.e having some velocity. K.E =1/2(m)(v^2).

Hence here P.E decreases but K.E increases at the same time. So total energy is conserved.

Final answer:

The conservation of mechanical energy principle states that in a system where only conservative forces act, the total mechanical energy (KE + PE) remains constant, represented by the equation KEi + PEi = KEf + PEf.

Explanation:

When discussing the scenario where the total mechanical energy, which is the sum of kinetic energy (KE) and potential energy (PE), remains constant, we are addressing a concept from Physics known as the conservation of mechanical energy principle.

This principle states that, in the absence of non-conservative forces like friction, the total mechanical energy of a system (KE + PE) does not change. The equation representing this principle is often displayed as KEi + PEi = KEf + PEf, where the subscripts i and f represent the initial and final states respectively.

This is a direct consequence of the work-energy theorem for conservative forces. It's important to note that this conservation applies only when all acting forces are conservative. Energy within such a system transfers between kinetic and various forms of potential energy, but the total amount of mechanical energy remains unchanged.

Kinetic energy is the amount of energy a object has while it's in motion, and thermal energy is heat energy. In this case when the heat rises in substances for example a solid it will transform into a liquid causing the molecules to move faster which is a increase of kinetic energy. So the answer is "when the heat in substances increase the kinetic energy increases."

Hope this helps!

Answer:

All matter is made up of particles that are constantly moving. The motion of the particles results in kinetic energy. The part of total internal energy that can be transferred is thermal energy. As temperature increases, the particles in a substance move faster and have greater kinetic and thermal energy.

Answer:

10lb

Explanation:

d work = force times distance ... if force is constant

Answer:

Work, W =Fd

Explanation:

Work is said to be done when a force is applied on an object in order to create some displacement. The mathematical expression for work done is given as:

W = F. d

Where

F is the applied force

d is the displacement

Work done also depend on the angle between the force and the displacement i. e.

[tex]W=Fd\ cos\ \theta[/tex]

[tex]\theta[/tex] is the angle between F and d

When the force and displacement are in same direction then [tex]\theta=0[/tex]. It gives W = F. d

When the force and displacement are perpendicular to each other, [tex]\theta=90[/tex]. It gives W = 0

Similarly, When force and displacement are in opposite direction, [tex]\theta=180[/tex]. It gives W = - F. d

So, the correct option is (D) '' W =Fd ''

60 mph

hope this helps

the equation is total distance/total time

180/3

60

1. When the object is waiting to be released, it is storing a lot of potential energy. When it is released, the potential energy that was once stored is converted into kinetic energy.

Continents move slowly over time Today, we know that the continents rest on massive slabs of rock called tectonic plates. The plates are always moving and interacting in a process called plate tectonics. The continents are still moving today. :P

Continents move due to plate tectonics, which explains how the Earth's lithosphere is divided into plates that interact and move. Plate boundaries are the regions where plates meet and their movement is responsible for the movement of continents.

The movement of continents is known as plate tectonics. The theory of plate tectonics explains how the Earth's lithosphere (the rigid outer layer of the Earth) is divided into several large and small plates that move and interact with each other. These plates can contain entire continents, and their movement is driven by convection currents in the Earth's mantle. When two continental masses are moving towards each other, they collide and can create mountain ranges, such as the Alps formed by the African and Eurasian plates.

Plate tectonics is the scientific explanation for why continents move. It involves the movement and interaction of several large and small plates that make up the Earth's lithosphere. By understanding plate tectonics, scientists have been able to explain the movement of continents as well as other geological phenomena such as earthquakes and volcanic activity.

Plate boundaries are the regions where two plates meet. There are three types of plate boundaries: divergent boundaries (where plates move apart), convergent boundaries (where plates collide), and transform boundaries (where plates slide past each other). The movement of these plates at the boundaries is responsible for the movement of continents over long periods of time.

Normal reaction force on the block while it is at rest on the inclined plane is given as

[tex]F_n = mgcos\theta[/tex]

here we know that

m = 46 kg

[tex]\theta = 29^o[/tex]

now we will have

[tex]F_n = 46*9.8*cos29 = 394.3 N[/tex]

now the limiting friction or maximum value of static friction on the block will be given as

[tex]F_s = \mu_s * F_n[/tex]

[tex]F_s = 0.6 * 394.3 = 236.56 N[/tex]

Above value is the maximum value of force at which block will not slide

Now the weight of the block which is parallel to inclined plane is given as

[tex]F_{||} = mg sin\theta[/tex]

here we know that

[tex]F_{||} = 46*9.8 sin29 = 218.55 N[/tex]

Now since the weight of the block here is less than the value of limiting friction force and also the block is at rest then the frictional force on the block is static friction and it will just counter balance the weight of the block along the inclined plane.

So here friction force on the given block will be same as its component on weight which is 218.55 N

The frictional force acting on the 46 kg mass is approximately 202.70 N.

The frictional force acting on the 46 kg mass can be found using the formula ƒk = µkN, where µk is the coefficient of kinetic friction and N is the normal force. The normal force can be found using N = mg cos(theta), where m is the mass of the block and g is the acceleration due to gravity. Plugging in the values, we get N = (46 kg)(9.8 m/s^2) cos(29°) = 397.67 N.

Now, we can calculate the frictional force using ƒk = µkN = (0.51)(397.67 N) = 202.70 N.

Therefore, the frictional force acting on the 46 kg mass is approximately 202.70 N.

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The answer here is A) 7.4 m.

As per the question Bob drops the bag full with feathers from the top of the building.

The mass of the bag(m)= 1.0 lb

Let the air resistance is neglected.As the bag is under free fall ,hence the only force that acts on the bag is the force of gravity which is in vertical downward direction.

Here the acceleration produced on bag due to the free fall will be nothing else except the acceleration due to gravity i.e g =9.8 m/s^2

Here we are asked to calculate the distance travelled by the bag at the instant 1.5 s

Hence time t= 1.5 s

From equation of kinematics we know that -

                S=ut + 0.5at^2     [ here S is the distance travelled]

For motion under free fall initial velocity (u)=0.

Hence   S= 0×1.5+{0.5×(-9.8)×(1.5)^2}

           ⇒ -S =0-11.025 m

            ⇒ S= 11.025 m

                   =11 m

Here the negative sign is taken only due to the vertical downward motion of the body .we may take is positive depending on our frame of reference .

Hence the correct option is B.

Answer

The steps in order to explain how a tornado forms are;

1. An extreme difference in wind speed at two elevations causes the wind shear

2. The difference in wind speed causes a column of air to rotate horizontally

3. A strong updraft connects the rotating air with clouds above

4. The column of air stretches to form a tornado

Explanation

The typical steps of tornado formation follow the below steps;

• Occurrence of a large thunderstorm which happens in the cumulonimbus clouds

• There is a change in wind direction and speed at higher attitudes that makes the air to swirl horizontally

• Air rising from the ground pushes up on the swirling air and tips over it

• The swirling air funnel starts to suck up more warm air from the ground

• The funnel enlarges and stretches towards the ground

• The funnel touches the ground level to form a tornado

The formation of a tornado involves wind shear caused by extreme differences in wind speed at various elevations, leading to horizontal air rotation that becomes vertical when connected to an updraft from the clouds. Tornadoes result from severe thunderstorms and can produce destructive winds up to 500 km/h.

To understand how tornadoes form, it is essential to arrange the steps of their formation in the correct sequence:

Tornadoes are associated with severe thunderstorms, particularly supercells, that involve a horizontally rotating column of air. The horizontal rotation shifts to a vertical axis due to the contrasting wind speeds, such as the strong cold winds from the jet stream and warmer winds rising from the Gulf of Mexico. A tornado is a violent rotating column of air that extends from a thunderstorm down to the ground and can reach wind speeds as high as 500 km/h (approximately 300 miles/h), particularly at the bottom where the funnel is narrowest.

Storm reports reveal that atmospheric pressure plays a crucial role in weather determination, and significant pressure differences can lead to strong winds capable of producing tornadoes. The understanding of rotational motion and angular momentum are integral to comprehending why tornadoes spin and increase in velocity; as their radius decreases, similar to an ice skater pulling in her limbs to spin faster.

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Stars exhibit a diverse range of temperatures and luminosities, determining their colors and types. The HR Diagram helps classify them, with main sequence stars like the sun, high-temperature blue supergiants, low-temperature red dwarfs, and evolved stars such as white dwarfs and red supergiants, showcasing the rich tapestry of stellar evolution.

5 - The color of the stars with the highest surface temperature is blue.

Stars emit different colors of light depending on their temperature. Higher temperatures, like those of blue stars, result in shorter wavelengths, while lower temperatures, like those of red stars, result in longer wavelengths.

6 - The color of the stars with the lowest surface temperature is red.

Red stars generally have lower surface temperatures, and they emit light at the longer, red end of the spectrum.

7 - The color of the stars from hottest to coldest is: blue, white, yellow, orange, red.

The sequence represents the color of stars from the hottest (blue) to the coolest (red). White stars fall between blue and yellow.

8 - Most of the stars on the HR Diagram are classified as main sequence stars.

The Hertzsprung-Russell (HR) Diagram is a graph of stars' luminosity (brightness) against their surface temperature. Most stars, including our Sun, fall into the main sequence category, where they spend the majority of their lives.

9 - The type of star that has a high temperature but a low luminosity is a white dwarf.

White dwarfs are hot but have low luminosity because they are small and no longer undergoing nuclear fusion in their cores.

10 - The type of star that has a high temperature and high luminosity is a blue supergiant.

Blue supergiants are massive stars with high temperatures and luminosities. They are in the later stages of their evolution and have expanded in size.

11 - The type of star that has a low temperature but high luminosity is a red supergiant.

Red supergiants are large, cool stars with high luminosities. They are in the late stages of their evolution.

12 - The type of star that has low temperature and low luminosity is a red dwarf.

Red dwarfs are small, cool stars with relatively low luminosities. They are the most common type of star in the universe.

Plotting Table: Letter - Temperature - Luminosity - Color - Type Of Star

A - 6,000 K - 10^1 - Yellow - Main Sequence

B - 20,000 K - 10^6 - Blue - Blue Supergiant

C - 20,000 K - 10^3 - White - White Dwarf

D - 2,500 K - 10^2 - Red - Red Supergiant

E – 4000 K – 10^-2 - Orange - Red Dwarf

Viscous force on the plate is given by

[tex]F = \eta A \frac{dv}{dx}[/tex]

[tex]F_v = 2.5* 1.5*1.5 * \frac{0.1}{1.2* 10^{-3}}[/tex]

[tex]F_v = 468.75 N[/tex]

Buoyancy force on the plate is given as

[tex]F_b = \rho V g[/tex]

[tex]F_b = 950* 1.5*1.5*1.2*10^{-3} * 9.8[/tex]

[tex]F_b = 25.14 N[/tex]

Weight of the plate = 50 N

Now for constant speed of plate the net force on it must be zero

SO here we can say

[tex]F_v + W = F_b + F[/tex]

[tex]468.75 + 50 = 25.14 + F[/tex]

[tex]F = 493.6 N[/tex]

So it will require a constant force of 493.6 N

The total force required to lift the metal plate at a constant speed of 0.1 m/s through the oil-filled gap is 72.5N. The power required to do this is 7.25 Watt.

The subject of this problem can be understood with fluid mechanics, particularly focusing on the concepts of viscosity and drag. Using the formula for viscous force: F = ηAv/d where η is the viscosity of the liquid (2.5 N.s/m²), A is the area of the plate (1.5m x 1.5m = 2.25 m²), v is the velocity of the plate (0.1 m/s), and d is the distance of the gap (25mm = 0.025 m). The force can be calculated as F = 2.5 x  2.25 x  0.1 / 0.025 = 22.5 N.

This is the extra force required to overcome the drag due to the viscosity of the oil. But we should also lift the weight of the plate, so the total force required is 50N (weight) + 22.5N (Viscous force) = 72.5N.

Power is calculated by multiplying the total force by the velocity of the motion. Hence, power = force x velocity = 72.5N x 0.1m/s = 7.25 Watt.

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