the frictional force that holds an object in place is called ______ friction.

Answer:

m is the mass of the sample, C is the specific heat, and T is the temperature

Explanation:

khan academy

The average velocity of the object in the first 5 seconds is 4 m/s.

The average velocity of an object can e defined as the average of the velocities of the object throughout its motion.

Average velocity can also be defined as the ratio of the total displacement of the object and the total time taken.

Considering the given object:

total displacement in the first 5 seconds = 40 m

time taken = 5 seconds

Average velocity = 40 m / 5 seconds

Average velocity = 4 m/s

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The magnitude forces of each one of the forces is F₁ = 75N and F₂ = 25N.

Any action that tends to preserve, modify, or deform a body's motion is considered to be a force in mechanics. Usually, Isaac Newton's three laws of motion from his Principia Mathematica are used to explain the concept of force (1687).

A body at rest or moving uniformly in a straight line will stay in that state until a force is applied to it, according to Newton's first law. According to the second law, any external force that interacts with a body causes it to accelerate (change its velocity) in the force's direction.

If two forces act on an object in opposite directions, the net force is the difference between the two forces, which means

F₁ - F₂ = Net force

Here net force = 50N, so

F₁ - F₂ =  50N

We have given that F₁ = 3F₂

Now substituting the value of F₁ in F₁ - F₂ =  50N, we get

3F₂ - F₂ =  50N

2F₂ = 50N

F₂ = 50/2

F₂ = 25N

And F₁ in  F₁ = 3F₂ is

F₁ = 3(25)

F₁ = 75N

Thus, The magnitude forces of each one of the forces is F₁ = 75N and F₂ = 25N

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Push the ball out away from her on the first step. Option B.

The key to consistent shots is the angle at which you pocket the ball. For right-handed bowlers, the pocket is between the 1st and 3rd pins. If you are left-handed it will be between pins 1 and 2. Keep your arms straight as you bring them back for the backswing and try to stay close to your body throughout the throw. Timing is important when releasing the ball.

A simple way to determine where the ball should exit the edge of the oil sample is simply to apply the rule of 31. Subtract 31 from the oil pattern distance. This will give you the board number where the ball ends the pattern. As a rule of thumb, right-handed bowlers place the inside of their left foot on the midpoint, and left-handed bowlers do the same with their right foot. Then stand with your other leg slightly behind you about 2 inches apart.

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Answer:

Maria can improve her arm swing motion in bowling by developing a free swing, where instead of controlling the ball with her arm, the ball controls her arm. This can be achieved by putting only mild to light grip pressure on the ball and pushing it back while standing relaxed. This will let the ball down and the gravitational energy will get her arm to the apex. As soon as she reaches the apex, she’ll have to slide forward and release the ball without pulling and grabbing.

Out of the options you provided, pushing the ball out away from her on the first step seems to be a good way for Maria to improve her arm swing motion in bowling.

So your answer would be (A) pushing the ball out away from her on the first step.

The angle is 53.5 degrees.

What is a flat mirror?

A plane mirror is a mirror with a flat (planar) reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence.

This ques have been solved in two steps:

Step 1:

given that;

Θ=107 degrees

from figure,

∠BAC=180-ψ-(90-φ)

∠BAC= 90-ψ-φ

∠AOC=180-2(ψ-φ)-2φ

∠AOC=180-2φ

Step 2: part(a)

writing an expression for the psi at point o:

Θ+180-2ψ=180

2ψ=Θ

ψ=Θ/2

above is the expression for ψ

Step 3: part(b)

The angle of ψ is,

ψ=Θ/2

ψ=107/2

ψ=53.5 degrees

Hence, the angle is 53.5 degrees.

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Let's use the formula of power.

Where P = 48 watts and V is 12 volts, let's use these magnitudes and solve for I.

Divide both sides by 12V.

Chemical energy is stored in the batteries.

What is chemical energy?

Chemical energy is the energy that is released when chemical substances engage in a chemical reaction and change into other substances. Batteries, food, and gas are a few examples of chemical energy storage mediums. Energy can be absorbed by or evolved from a chemical system when breaking and creating chemical bonds.

The energy transformation occurring when a battery-powered toy car is set into motion when switched on is chemical to electrical to mechanical.

When a remote-controlled toy car begins to move, potential energy is converted into kinetic energy.

A battery has chemical energy stored within it.

When switched on, the circuit within the toy car closes.

This causes the chemical energy to be converted to electrical potential energy.

When the remote is pressed to make the toy car move, this potential energy is converted to mechanical kinetic energy.

In this way, energy transformation takes place from chemical to electrical to mechanical.

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The magnitude and point of application of the resultant of the four forces

R=200N

AB=CD=125mm

BC=216.5mm

Point to of application

z axis=200mm

y-axis= 63.4mm

This is further explained below.

Generally, the Radius of the quarter circle,

r=250mm

Force, P=40N

Resultant force,

R=-80+120+200-PR

=-80+120+200-40

R=200N

Therefore

cos60=AB/AC

0.5=AB/250

AB=CD=125mm

sin60=BC/AC

√3/2=BC/250mm

BC=216mm

The result of the four forces.Taking moments about the z-axis

[tex]\sum[/tex] My =200*250-80*CD

[tex]\sum[/tex] My=40000N-mm

[tex]\sum[/tex]=R*z

z=200mm

Taking moments about the z-axis

[tex]\sum[/tex]120*250-80*BC

[tex]\sum[/tex] Mz=12680N-mm

12680=200*4

Y=63.4mm

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The mass of the substance is 14.58g.

Solution:

Heat  ΔQ = 350J

Initial temperature  T = 10°C

Final temperature [tex]T^{1}[/tex] = 30°C

Change in temperature:  

ΔT =[tex]T^{1}[/tex]  - T

= 30 - 10

=  20°C

Specific heat: 1.2 J/g°C

The mass of a substance:

ΔQ = mcΔt

m = ΔQ/cΔt

= 350/1.2 x 20

= 14.58 grams.

Molecular weight is the sum of the average masses of the atoms in the molecule of a substance. It is calculated by adding together the atomic masses of the elements in the substance and multiplying each by the index of the molecular formula. The mass of 1 mole of a substance in 1 gram is called molar mass.

Find the atomic weight of each element in the formula, multiply by the number of atoms of that element in the compound, and add to all other elements. This gives the 1 mole mass of the molecule in grams. The molar mass of a substance is the mass in grams of one mole of that substance. This mass is the atomic mass of the chemicals that make up the substance, expressed in atomic mass units AMU.

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A body is pulled along horizontal plane by a constant force of 10N applied pavement to the plane. The work done in moving a distance 20m is (W)= 200 J.

When some amount of force is acted on the object and it moves some distance that means some work has been done on the object. It can be measured in Joule.

To calculate the work done we are using the formula here is,

W=Fd

We are given here,

F= The amount of force acting on the body. = 10N

d= The distance the object move. = 20m

We have to calculate the values of work done = W

Now we put the values in the equation we get,

W= Fd

Or, W= 10*20

Or, W= 200N

From the calculation we can say that, The work done in moving a distance 20m is (W)= 200 J.

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A body is pulled along horizontal plane by a constant force of 10N applied pavement to the plane. calculate work done in moving a distance 20m

When car accelerates away from a stop sign, back of the seat exert a greater force on the rear passenger seat.

The reason is that when the car is accelerating, the frictional moment of the ground that give the rear wheel of the car its driving wheel is more than the gravity moment of the car. This is the reason that the car will tilt its head.

Newton’s first law states that objects in motion stays in motion and objects at rest stays at rest. So the accelerating car is overcomes the inertia the body mass is exerting on the seat.

When car accelerates forward, the backward sensation is caused by body's inertia.

The driver is less affected because the driver’s seat is adjusted to have better control on the car. The steering wheel also serves as a support to  the forces applied to the driver . The passenger’s seat is generally adjusted for maximum comfort that’s why the passenger is not as supported on the seat as compared to the driver.

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Photons are massless.

What is electromagnetic radiation?

Electromagnetic radiation consists of electromagnetic field-propagating waves that carry electromagnetic radiant energy. Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays are included. All of these electromagnetic waves comprise the electromagnetic spectrum.

Given that:

E= Energy

h= Plank's constant = 6.6*10^-34 Js

c= speed of light = 3*10^8 m/s

E=hv = hc/λ

λ=745 nm = 745*10^-9 m

E=6.6*10^-34 * 3*10^8/745*10^-9

E= 2.657* 10^19 = 2.66* 10^19 J

hence, the energy of one photon of this light is 2.66* 10^19 J

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Correct question:

Electromagnetic radiation with a wavelength of 745 nm appears as a red light to the human eye. The energy of one photon of this light is...............  A) 2.67 x 10-28 B) 2.67 x 10-19 C) 1.48 x 10-22 D)1.48 × 10-31 E) 3.75 × 1018

An object with mass attracts another object with mass; the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects.

The percentage of Weight change =( 140-32.56) / 140  X100

                                     = 76.74 %.

F = force

G = gravitational constant

m_1 = mass of object 1

m_2 = mass of object 2

r = distance between centers of the masses

F =[tex]G \frac{ m_1 m_2}{r^2}[/tex]

F = 140N (object on the surface of the earth)

radius of the earth = 6 378.1 x 10^3 m

new distance = [tex]6.3781 x 10^6 + 6.7 x10^6. =13.07 x 10^6.[/tex]

F1/F2 =[tex](13.07 x10^6)^2/(6.3x10^6)^2[/tex].

F1/ F2 = 4.3

140 N /F2 = 4.3

F2 =140/ 4.3 = 32.56 N

The percentage of Weight change =( 140-32.56) / 140  X100

                                     = 76.74 %.

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Since Intensity depends on power and area, star b will have the same brightness as star a but look smaller

Luminous Intensity is the magnitude or quantity of the brightness of light emitted by a luminous object.

If two stars have the same luminosity, but star b is three times farther away from us than star a. If we are to compare star a with star b, star b will look bright but small.

The reason is due to the fact that Intensity is directly proportional to power and inversely proportional to area and not to the distance or length.

Therefore, star b will look bright but small.

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Pressure (P) is 0.1309 atm.

A gas that meets the definition of an ideal gas has extremely small molecular volumes and molecular forces that have no impact on the behavior of the gas.

When the parameters are kept within the proper ranges throughout a large range around normal temperature and pressure, many gases, including nitrogen, oxygen, hydrogen, noble gases, some heavier gases like carbon dioxide, and mixtures like air, can be handled as ideal gases.

Given,

Number of moles n =  0. 02 mol

Temperature T = 399 k

Pressure P = ?

Volume V = 5L

The ideal gas constant is equal to 0.08206L atm/mol K.

Number of moles

n = P V/R T

0. 02 = P × 5/0.08206 × 399

0.02 = P × 5/ 32.741

0.65482 =  P × 5

P = 0.1309 atm.

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Answer:

I'm not going to give you the direct answer because you shouldn't cheat but I will give a hint

Explanation:

Physics, chemistry, astronomy, geology and other disciplines concerned with the study of non-living things are examples of physical science.

Weight is the force of gravity on mass, which is intrinsic to matter. Remember that F=ma. The acceleration due to gravity is independent of the mass of the object falling, but the force it feels, and thus the weight of the object, is.

They record the depth of the hole made in the sand by each student's object  gives the idea about the mass of the objects.

Naveed's object has less mass

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To launch a 60 kg human at the given speed, the spring constant needed is 1500 N/m.

This is the proportion of a spring's extension to the force applied to it. Utilizing the energy conservation principle, the spring's spring constant is determined. The human will transform the elastic potential energy of the spring into kinetic energy in order to launch at the desired speed.

U = K.E

¹/₂kx² = ¹/₂mv²

k = mv²/x²

where;

m is mass of the human

v is the speed of the cannon

x is the extension of the spring

k is the spring constant

Substitute the given parameters and solve for the spring constant.

k = (60x 15²) / (3²)

k = 1500 N/m

A spring constant of  1500 N/m is need to maintain the law of conservation of energy, from elastic potential energy of the spring to kinetic energy of the human,

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The complete question is -

In order To launch a 60 kg human so that he leaves a cannon moving at a speed of 15 m/s, you need a spring with an appropriate spring constant. This spring will be compressed 3.0 m from its natural length to launch the person. The cannon oriented at an angle of 37⁰ above the horizontal?

a) Which spring constant should the spring have so that the cannon functions as desired?

Answer:

348.7 N

Explanation:

Static friction coeff not needed.

This is a little complicated because some of the force on the rope (F) is making the Normal Force ( and thus the frictional force) less

Normal force will be      ( 100 ( 9.81) - F sin(50) )

  then friction becomes  .3  ( 100(9.81) - F sin 50)

Force pulling horizontally will have to be

  F = ma

         100 kg * .1 m/s = 10 N      PLUS the effort to overcome friction

   So the horizontal force will be  

        10 +  (  .3( ( 100)(9.81) - F sin50 ))      <===simplify a bit

         10 + 294.3  - .3 F sin50

          304.3 - .3 F sin50  = horizontal force

The horizontal force is also given by   F cos 50      Now we can equate the two underlined items above

304.3 - .3 F sin 50   =  F cos 50

304.3   = F ( cos50 + .3 sin50)

304.3 / ( cos 50 + .3 sin 50) = F        = 348.7 N        

Asin+1200sin51.3+1400sin42=Asin+1896 N is the resulting force in the vertical direction. This also equals zero.

When a three-force member is in equilibrium, the forces must be contemporaneous if they are not parallel. As a result, the lines of action of all three forces operating on such a component must cross at some point; hence, any single force is the equilibrant of the other two forces.

When the outcome of three vectors is a Null vector, i.e. it has no magnitude and direction, the three vectors are at equilibrium. The product of three vectors equals the vector sum of the vectors.

When a thing is in equilibrium, its forces are balanced.

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compared to a giant iceberg, a hot coffee cup has a higher temperature but low internal energy.

The temperature of a hot cup of coffee is higher because the average kinetic energy of the molecules of hot coffee are higher than the molecules of a giant ice cap. If we put a thermometer in both, we would clearly see the difference.

Despite having a higher temperature, hot coffee has lower internal energy as compared to icebergs because the giant iceberg contains a lot of particles whose combined energy will make the total internal energy of the iceberg much larger than the hot coffee cup.

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Energy is stored in the electric field between the tubes is 5.85 x 10-11 J.

What is electric field?

Any charge results in an electric field being connected to a specific spot in space. The value of E, often known as the electric field strength, electric field intensity, or just the electric field, expresses the magnitude and direction of the electric field. Without any precise information of what created the field, knowing the value of the electric field at a certain location is sufficient to predict what would happen to nearby electric charges.

We have inner tubes.

A1 = \pi ro2 = (3.14) [(0.03 m) / 2] 2

A1 = (3.14) (0.000225 m2) (0.000225 m2)

A1 = 0.0007065 m2

We have outer tubes.

A2 = \pi ri2 = (3.14) (3.14) [(0.04 m) / 2] 2

A2 = (3.14) (0.0004 m2) (0.0004 m2)

A2 = 0.001256 m2

The conducting tubes' total area is provided by -

A = (0.0007065 m2) + (0.001256 m2) (0.001256 m2)

A = 0.0019625 m2

We have a formula that yields

(8.85 x 10-12 C2/Nm2) (0.0019625 m2)/d = C = varepsilon0 A (0.3 m)

C = 5.78 x 10-14 F

The energy stored in the electric field between the tubes when these are coupled to a 45 volt battery is provided as:

U = (1/2) C V2 = (0.5) (5.78 x 10-14 F) (45 V)

U = 5852.2 x 10-14 J

U = 5.85 x 10-11 J

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Initial velocity = 8 m/s

Final velocity = 23 m/s

Time for the velocity change  = 3 s

By definition, the average acceleration is

(23 - 8)/3 = 5 m/s²

Answer: 5 m/s²

Hope this helps!! have a great rest of your day!

A periodic or cyclic motion's wave velocity is the distance it travels in a unit of time (in any direction).(I) the wave velocity 60 m/s.(ii) The three other position of the crest are 8m, 13m, 18m (iii) time period= 0.083 sec (iv) equation of the wave y(x, t)= 1.3 sin (kx-ωt+Ф)

what is wave velocity?

(I) according to the wave velocity equation

v= wavelength* frequency= 5*12=60 m/s

(II) x=3m,

three other position of crest x1= x+λ= 3+5= 8m

x2= x+2λ= 3+10=13m , x3=x+3λ= 3+15=18m

(iii)  time period= 1/ frequency=0.083 sec

(iv) amplitude given= 1.5 m

equation of wave y(x, t)= A sin (kx-ωt+Ф)

k=  wave number

ω=angular frequency

A= amplitude of wave

x= horizontal position variable

t=time period

Ф=Phase

equation of the wave

y(x, t)= 1.3 sin (kx-ωt+Ф)

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Answer:

0.9 m

Explanation:

Hooke’s Law

[tex]\large\boxed{F = ke}[/tex]

where:

Given values:

Substitute the given values into the formula to find k:

[tex]\implies 2.0=0.30k[/tex]

[tex]\implies k=\dfrac{2.0}{0.30}[/tex]

[tex]\implies k=\dfrac{20}{3}\; \sf N/m[/tex]

To find the extension if the force applied is 6 N, substitute the found value of k and the given value of F into the formula and solve for e:

[tex]\implies 6=\dfrac{20}{3}e[/tex]

[tex]\implies 18=20e[/tex]

[tex]\implies e=\dfrac{18}{20}[/tex]

[tex]\implies e=0.9\; \sf m[/tex]

Hence,option D . The rod is made up of plastic, the positive charge from the cloth to the rod.

Static charge or an electrostatic charge is a deficiency or extra of electrons that occurs on ungrounded or insulating surfaces. it's miles produced by way of triboelectric costs, expenses which can be generated by friction among surfaces, including the motion of paper thru a copier or printer.

An electrical charge is created when two materials come into contact or are rubbed collectively. when the substances are in touch, electrons can be actually rubbed off of one object and onto the alternative.

Static power is an imbalance of electric fees within or on the floor of a material. The fee stays till it could pass away by way of an electric present-day or electric-powered discharge.

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The speed of light is 3.00 x 10^8 meters per second. A "light-year" is the measurement for this distance.

time = 31536000 seconds

First, We have to calculate the number of seconds in a year.

time = (365 days)

(24 hours/day)

(3600 seconds/hour)

time = 31536000 seconds

We can calculate the distance that light travels in this many seconds. distance = speed x time

distance = (3.00 x 10^8 m/s) (31536000 seconds)

distance = 9.46 x 10^{15} meters

A light year is 9.46 x 10^{15} meters

What is light year?

A light-year, also spelled lightyear, is a significant unit of length that is used to express astronomical distances. It is roughly 9.46 trillion kilometers in length.

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Answer:

a

Explanation:

The statement is true. Solar radiation, also referred to as ultraviolet or shortwave radiation, is emitted by the Sun. Longwave or infrared radiation is emitted by the Earth.

Because they are cooler than the surface of the sun, the earth and its atmosphere emit infrared radiation with longer wavelengths than solar radiation. The 3 - 100 m range contains the majority of the energy of the infrared radiation that the earth and its atmosphere emit. Infrared is the thermal emission (or heat) from our planet that earth scientists study. Some of the energy from incident solar radiation that strikes Earth is absorbed by the atmosphere and the surface, warming the planet. Infrared radiation, which is emitted by the Earth, is what causes this heat.

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The magnetic domains in an unmagnetized nail are oriented at random, which causes the net magnetism to sum to zero. Many of the magnetic domains in a magnetized nail are aligned.

A magnetized iron nail has aligned domains, while an unmagnetized iron nail has domains that are orientated arbitrarily.

The material will be drawn to a magnet in its unmagnetized state but won't function as a magnet. In other words, two ferromagnetic materials that are not magnetically attracted to one another will not attract one another.

Iron becomes magnetized when it is exposed to a magnetic field because the atoms start to align their electrons with the magnetic field's direction. The two magnetic objects then become attracted to one another as a result of this.

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