Which action is not an example of work?


picking up a box off the floor


pushing a box across the floor


holding a tray in the cafeteria line


raising a barbell over your head

Answer:

c)both

Explanation:

The laws of reflection hold true for all the reflecting surfaces either spherical or plane. Therefore, the plane mirror, concave mirror and the convex mirror all will follow the laws of reflection.

Answer:

It holds for only plane mirrors

It states that the angle of incidence is equal to the angle of reflection.

This is only possible in plane mirrors only

Answer:

1. 8437500 N

2. The force between the two charges is attractive.

Explanation:

1. Determination of the force between the two charges.

Charge 1 (q₁) = –2.0 C

Charge 2 (q₂) = 3.0 C

Distance apart (r) = 80 m

Electrical constant (K) = 9×10⁹ Nm²/C²

Force (F) =?

F = Kq₁q₂ / r²

F = 9×10⁹ × 2 × 3 / 80²

F = 5.4×10¹⁰ / 6400

F = 8437500 N

Thus, the force of attraction between the two charges is 8437500 N

2. From the question given, the charges are:

Charge 1 (q₁) = –2.0 C

Charge 2 (q₂) = 3.0 C

We understood that like charges repels while unlike charges attract. Since the two charges (i.e –2 C and 3 C) has opposite signs, it means they will attract each other.

Thus the force between them is attractive.

Answer:

c - Association soccer

because there is football in form of American football, hence it's soccer

Answer:

B.

Explanation:

Soccer was the only football-type game in the United States until American-style football became popular in the 1870s

Answer:

The foundation was somewhat bad

Explanation:

The leaning was caused by the uneven settling of the building's foundations in the soft ground. Three of its eight stories had been completed when the uneven settling of the building’s foundations in the soft ground became noticeable. At that time, war broke out between the Italian city-states, and construction was halted for almost a century. This pause allowed the tower’s foundation to settle and likely prevented its early collapse.

hope this helps:)

Answer:

R = mg

F = µsR

Fs= 0.4 × ( 88 × 10)

Fs = 772 N

Fk= µk R

Fs= 1.33 × 880 N

Net force = (772+(1.33×880))-240 N

Answer:

Explanation:

In order for one to carry something, they need to be exerting a force that is equal to the weight of the object. For Antonio therefore to hold the 1-pound bag, he needs to apply a 1-pound force.

Pounds measure the mass of an object. On his left hand Antonio has 1 pound and on the right he has 2. He is therefore carrying more mass on his right hand than on his left.

Answer:

36 J

Explanation:

Let's start off with the Kinetic Energy formula: 1/2m[tex]v^{2}[/tex]

So to find the change in Kinetic Energy, you would first have to find the Kinetic Energy in the beginning and in the end.

*Note: Mass: you incorrectly wrote weight = 6 kg- because weight is a force you have to write 6 Newtons. If you are talking about the mass, you would write 6 kg. If you are talking about weight, you would write 6 Newtons. The difference will make significant changes to the answer, so I will give you the answer for both.

If 6 kg is the MASS:

Beginning: find the kinetic energy.

Plug in all parts of the formula: 1/2mv^2 = [tex]\frac{1}{2}[/tex](6)(2 squared)= [tex]\frac{1}{2}[/tex](6)(4)= 12 J

End: find the kinetic energy.

Plug in all parts of the formula: 1/2mv^2=[tex]\frac{1}{2}[/tex](6)(4 squared)=[tex]\frac{1}{2}[/tex](6)(16)= 48 J

Answer:

36 J

If 6 kg is the WEIGHT:

We know that the weight formula is mg, or mass times acceleration due to gravity (which is always 9.8 m/s^2). Plug in the numbers:

Weight = mass x acceleration due to gravity

6 = mass x 9.8

6 = 9.8m

*Divide both sides*

mass = 0.6 kg

Now, we can use the mass to find the kinetic energy.

Beginning: find the Kinetic Energy

Plug in all parts of the formula: 1/2mv^2 = [tex]\frac{1}{2}[/tex](0.6)(2 squared)= [tex]\frac{1}{2}[/tex](0.6)(4)= 1.2 J

End: find the Kinetic Energy

Plug in all parts of the formula: 1/2mv^2=[tex]\frac{1}{2}[/tex](0.6)(4 squared)=[tex]\frac{1}{2}[/tex](0.6)(16)= 4.8 J

Answer:

3.6 J

(this answer is not very feasible, so 36 J is the way to go. But just remember, don't mix up weight and mass again- as you can see, they lead to different answers!)

Answer:

Shrijesh should be located at 4[m] from the fulcrum point.

Explanation:

We must keep in mind that the moment around the point of rotation (fulcrum) must be equal, so that the bar remains in balance.

The moment for shrijan is:

[tex]M=F*d\\M=600*2\\M_{shrijan}=1200[N*m][/tex]

So if the moment should be equal, the distance can be obtain from the same equation using the shrijesh's force or weight.

[tex]M_{shrijesh}=F*d_{2}\\1200=300*d_{2}\\d_{2}=4[m][/tex]

Explanation:

Numbers of accepted genera

The numbers of either accepted, or all published genus names is not known precisely; Rees et al., 2020 estimate that approximately 310,000 accepted names (valid taxa) may exist, out of a total of c.

Answer:

B. reflection

Explanation:

Have a good day! :)

The bouncing back of a ray of light, sound, or heat when the ray hits a surface that it does not penetrate is called a reflection, so option B is correct.

Reflection is the abrupt change in a wave's propagation direction when it encounters a boundary between two media. The approaching wave disturbance is still present in the same medium, at least in part. At plane borders, reflection happens regularly and follows a straightforward law.

Angles of incidence (between the oncoming wave's direction of motion and a perpendicular to the reflecting surface) are identical to angles between the reflected wave's direction of motion and a perpendicular (angle of reflection). Diffuse reflection occurs at uneven or irregular boundaries. The percentage of the wave's energy that is reflected by a surface material is known as its reflectivity.

Therefore, the bouncing back of a ray of light, sound, or heat when the ray hits a surface that it does not penetrate is called a reflection.

To know more about Reflection:

https://brainly.com/question/2254222

#SPJ6

Explanation:

"The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution. A concentrated solution is one that has a relatively large amount of dissolved solute. A dilute solution is one that has a relatively small amount of dissolved solute."

Answer:

a) The angular speed of the child is approximately 1.257 rad/s

b) The angular speed of the teenager is approximately 1.257 rad/s

c) The tangential speed of the child is approximately 1.257 m/s

d) For the child, r = 2 m

The tangential speed of the teenager is approximately 2.513 m/s

Explanation:

The revolutions per minute, r.p.m. of the merry-go-round = 1 revolution/(5 s)

The radius of the merry-go-round = 2 m

The location of the child = 1 m from the axis

The location of the teenager = 2 m from the axis

1 revolution = 2·π radians

Therefore, we have;

The angular speed, ω = (Angle turned)/(Time elapsed) = (2·π radians)/(5 s)

∴ The angular speed of the merry-go-round, ω = 2·π/5 radians/second

a) The angular speed of the child = The angular speed of the merry-go-round = 2·π/5 radians/second ≈ 1.257 rad/s

b) The angular speed of the teenager = The angular speed of the merry-go-round = 2·π/5 radians/second ≈ 1.257 rad/s

c) The tangential speed, v = r × The angular speed, ω

Where;

r = The radius of rotation of the object

For the child, r = 1 m

The tangential speed of the child = 1 m × 2·π/5 radians/second = 2·π/5 m/s ≈ 1.257 m/s

d) For the child, r = 2 m

The tangential speed of the teenager = 2 m × 2·π/5 radians/second = 4·π/5 m/s ≈ 2.513 m/s

Answer:

The final volume of the gas is 2.25 L.

Explanation:

Given;

initial volume of the gas, V₁ = 1.5 L

initial pressure of the gas, P₁ = 3 atm

final pressure of the gas, P₂ = 2 atm

final volume of the gas, V₂ = ?

Apply Boyle's law to determine the final volume of the gas;

P₁V₁ = P₂V₂

V₂ = (P₁V₁) / P₂

V₂ = (3 x 1.5) / (2)

V₂ = 2.25 L

Therefore, the final volume of the gas is 2.25 L.

Answer:

alcohol

Explanation:

alcohol is drives under the influence

Answer:

Has lost the ability to make wise decisions

Answer:

12 grams

Explanation:

To calculate mass, we can use the following formula:

Mass = density × volume

Plug in the values

Mass = 1.5 × 8

Mass = 12

Therefore, the mass of the object is 12 grams.

I hope this helps!

Answer:

ans 5

Explanation:

hope it's help It seems to me

Answer:

The velocity of the blades is 88.185 m/s.

Explanation:

Given;

length of the blade, r = 80 m

angular speed, ω = 1 rev per 5.7 seconds

The velocity of the blades is calculated by applying the following circular motion equation that relates linear velocity (V) and angular speed (ω);

[tex]V = \omega r\\\\V = (\frac{1 \ rev}{5.7 \ s} \times \frac{2 \pi \ rad}{ 1 \ rev} )(80 \ m)\\\\V = 88.185 \ m/s[/tex]

Therefore, the velocity of the blades is 88.185 m/s.

Answer:

5 Newtons Up and 5 Newtons Right

Explanation:

Treat each force vector as a value and choose the upward and rightward directions to be positive. Downward and Leftward forces will be considered "negative". For the vertical net force we have a positive 10 N upwards and a negative 5 N downwards. The net force in the vertical will be 5 N upwards. In the horizontal we have 10 N to the right and 5 N to the left. The net force in the horizontal will be 5 N to the Right.

It is easier if you split the motion into horizontal and vertical components.

Answer:

78.4 m

Explanation:

To obtain the height of the cliff;

We can use the Relation to obtain the final velocity, v

v = u + at

a = acceleration due to gravity = 9.8m/s²

v = 0 + (9.8*4)

v = 0 + 39.2

v = 39.2 m/s

To obtain the Height, S

v² = u² + 2aS

39.2^2 = 0 + 2(9.8)S

39.2^2 = 0 + 19.6S

1536.64 = 19.6S

S = 1536.64 / 19.6

S = 78.4 m

Answer:

D. diaphragm

Explanation:

The question above is related to the different parts of the microscope. Among the choices above, it is the diaphragm that regulates the amount of light passing through the specimen. This is located below the stage (the platform where the slide of specimen is placed). With the help of the diaphragm, the intensity of light is controlled, which allows the observer to see the specimen in the best contrast.

Additional Information:

The arm links the base of the microscope to its head.

The base simply supports the microscope.

The body tube links the objective lenses to the eyepiece.

Answer:

Sound waves have a low speed of 330 m/s

Sound waves are mechanical waves

Electromagnetic waves have a greater speed of 3.0×10^8 m/s

Electromagnetic waves are due to disturbance of electromagnetic objects.

Answer:

I think the answer might be C

C. Carbon is not a product of a complete combustion reaction of a hydrocarbon.

Complete combustion is a process in which all carbon contained in a fuel or gas stream is converted to carbon dioxide.

The generic equation for the complete combustion of a hydrocarbon is:

CxHy + O₂ ⇒ CO₂ + H₂O + Energy

Let's consider which of the following is a product of a complete combustion reaction of a hydrocarbon.

A. energy. YES.

B. carbon dioxide. YES.

C. carbon. NO.

D. water. YES.

C. Carbon is not a product of a complete combustion reaction of a hydrocarbon.

Learn more about complete combustion here: https://brainly.com/question/9913173

Answer:

This situation happens because radius of Jupiter is 10 times greater than radius of the Earth.

Explanation:

According to Newton's Law of Gravitation, weight is directly proportional to the mass of the planet ([tex]M[/tex]), measured in kilograms, and inversely proportional to the square of the radius of the planet ([tex]R[/tex]), measured in meters. That is:

[tex]W \propto \frac{M}{R^{2}}[/tex]

[tex]W = \frac{k\cdot M}{R^{2}}[/tex](1)

Where [tex]k[/tex] is proportionality constant, measured in Newton-square meters per kilogram.

Then, we eliminate the proportionality constant by constructing this relationship:

[tex]\frac{W_{J}}{W_{E}} = \left(\frac{M_{J}}{M_{E}}\right)\cdot \left(\frac{R_{E}}{R_{J}} \right)^{2}[/tex]

Where subindices J and E mean "Jupiter" and "Earth", respectively. If we know that [tex]\frac{M_{J}}{M_{E}} = 300[/tex], [tex]W_{E} = 500\,N[/tex]and [tex]W_{J} = 1500\,N[/tex], then the ratio of radii is:

[tex]\frac{R_{E}}{R_{J}} = \sqrt{\left(\frac{W_{J}}{W_{E}} \right)\cdot \left(\frac{M_{E}}{M_{J}} \right)}[/tex]

[tex]\frac{R_{E}}{R_{J}} = \sqrt{3\cdot \left(\frac{1}{300} \right)}[/tex]

[tex]\frac{R_{E}}{R_{J}} = \frac{1}{10}[/tex]

Therefore, this situation happens because radius of Jupiter is 10 times greater than radius of the Earth.

Answer:

The amount of kinetic energy lost during the collision is 60.75 J

Explanation:

The given parameters are;

The mass of the object moving in the +x direction, m₁ = 1.00 kg

The velocity of the object moving in the +x direction, v₁ = 10.0 m/s

The mass of the object moving in the -x direction, m₂ = 1.50 kg

The velocity of the object moving in the +x direction, v₂ = 5.00 m/s

The final velocity of the 1.00 kg mass after collision, v₃ = 4.00 m/s

The direction of motion of the 1.00 kg mass after collision = -x direction

The total initial kinetic energy of the system, [tex]K.E._{total \ initial}[/tex] = 1/2·m₁·v₁² + 1/2·m₂·v₂²

∴ [tex]K.E._{total \ initial}[/tex]  = 1/2×1.00×10² + 1/2×1.50×5² = 68.75 J

The final kinetic energy of the system, [tex]K.E._{final}[/tex]  = 1/2·m₁·v₃²

[tex]K.E._{final}[/tex] = 1/2×1.00×4² = 8 J

The amount of kinetic energy lost during the collision, [tex]\Delta K.E._{system}[/tex] is given as follows;

[tex]\Delta K.E._{system}[/tex] =  [tex]K.E._{final}[/tex] -[tex]K.E._{total \ initial}[/tex] = 8 J - 68.75 J = -60.75 J

The amount of kinetic energy lost during the collision = 60.75 J.

Answer:

I think D is correct option

Answer:

When two objects interact, each one exerts a force on the other that can cause energy to be transferred to or from the object. For example, when energy is transferred to an Earth-object system as an object is raised, the gravitational field energy of the system increases.

Explanation:

Force and work are directly proportional to each other, while force and displacement are indirectly propotional. The equation showing the relationship is W= Fd. W represents work measured in joules; F represents force in newtons; and d represents distance in meters.