Greek engineers had the unenviable task of moving large columns from the quarries to the city. One engineer, Chersiphron, tried several different techniques to do this. One method was to cut pivot holes into the ends of the stone and then use oxen to pull the column. The 4-ft diameter column weighs 13200 lbs, and the team of oxen generates a constant pull force of 1500 lbs on the center of the cylinder G. Knowing that the column starts from rest and rolls without slipping, determine the velocity of its center G after it has moved 5 ft and the minimum static coefficient of friction that will keep it from slipping.

Answer:

To indicate that energy has been added or removed as heat or work to a system, the internal energy of the system is calculated.

This is because:

1- the internal energy follows the formula:

ΔU = Q - W

2- the internal energy is indicated by any alternation in temperature

Therefore, the answer is:

internal energy

Answer:

Away from all ppl

Explanation:

Answer:

Explanation:

idk

Explanation:

32. The area under the curve from t = 0 and t = 2 is the area of the triangle.  The base of the triangle is 2 seconds, and the height of the triangle is 2 m/s.  The area is therefore:

A = ½ bh

A = ½ (2 s) (2 m/s)

A = 2 m

33. The car is not moving when the velocity is 0 m/s.  This occurs at t = 0, t = 6, and t = 10.

Answer:

(D. Gestalt psychology) , is the school of psychology that believes perception is more than the sum of its parts, it involves a whole pattern .

This type of school of psychology studied how all components of sensations are assembled into one's perception .

hope this helps :)

Answer:

Gestalt psychology is the school of psychology that believes perception is more than the sum of its parts—it involves a whole pattern.

Answer:

170km/hr

Explanation:

Vav=v1+v+v3.....

A car travels for an hour at a speed of 20 km/hour, the next two hours at a speed of 65 km/hour, and the final hour at a speed of 85 km/hour, then the average speed of the car in the entire trip would be  56.25 kilometers/hour.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.

As given in the problem,if a car travels for an hour at a speed of 20 km/hour, the next two hours at a speed of 65 km/hour, and the final hour at a speed of 85 km/hour,

The total distance traveled by car =  20×1 + 65×2 +85×1

                                                        =225 kilometers

The total time taken by the car = 4  hours

The avearge speed of the car = 225/4

                                                    =56.25 kilometers/hour

Thus,the average speed of the car would be 56.25 kilometers/hour.

To learn more about speed from here,refer to the link;

brainly.com/question/7359669

#SPJ2

Answer:

vernier calipers....................

Answer:

d. vernier calipers

Explanation:

manometer is used for measuring pressure

measuring cylinder is for liquids

micrometer can only measure objects less than 2.5 cm (like a  thin wire)

so the answer is vernier calipers, they have a measuring range of 1-15 cm.

Answer:

[tex] \boxed{\sf Time \ taken = 10 \ seconds} [/tex]

Given:

Initial velocity (u) = 10 m/s

Final velocity (v) = 30 m/s

Acceleration (a) = 2 m/s²

To Find:

Time taken (t) by bike to increase its velocity from 10 m/s to 30 m/s with an acceleration of 2 m/s²

Explanation:

[tex]\sf From \ equation \ of \ motion:[/tex]

[tex] \boxed{ \bold{v = u + at}}[/tex]

Substituting values of v, u & a in the equation:

[tex] \sf \implies 30 = 10 + 2t[/tex]

Substract 10 from both sides:

[tex] \sf \implies 30 - 10 = (10 - 10) + 2t[/tex]

[tex] \sf \implies 20 = 2t[/tex]

20 = 2t is equivalent to 2t = 20:

[tex] \sf \implies 2t = 20[/tex]

Dividing both sides by 2:

[tex] \sf \implies \frac{ \cancel{2}t}{ \cancel{2}} = \frac{20}{2} [/tex]

[tex] \sf \implies t = \frac{10 \times \cancel{2}}{ \cancel{2}} [/tex]

[tex] \sf \implies t = 10 \: s[/tex]

So,

Time taken (t) by bike to increase its velocity from 10 m/s to 30 m/s with an acceleration of 2 m/s² = 10 seconds

Explanation:

F = ma

F = m Δv / Δt

F = (1500 kg) (0 m/s − 30 m/s) / 3 s

F = -15,000 N

Answer:

a = (v² − v₀²) / (2 (x − x₀))

Explanation:

v² = v₀² + 2a(x − x₀)

Subtract v₀² from both sides.

v² − v₀² = 2a(x − x₀)

Divide both sides by 2 (x − x₀).

(v² − v₀²) / (2 (x − x₀)) = a

Explanation:

F = mv²/r

If the velocity is halved:

F' = m(v/2)²/r

F' = ¼ mv²/r

F' = ¼ F

The centripetal force is reduced by a factor of 4.

Answer:

Calcium sulphide

Explanation:

If we look at the compound, we will discover that it is an ionic compound. The compound is comprised of Ca^2+ and S^2-.

The cation Ca^2+ is the calcium ion while the anion S^2- is the sulphide ion hence the compound is rightly named calcium sulphide.

Answer:

607.6g

Explanation:

Assume each mark on the scale represented 1 g. That is 1 cm = 1g

To estimate how much a sheet of paper would mass a sheet of paper is 28 cm by 21.7 cm, first calculate the area.

Area = 28 × 21.7 = 607.6 cm^2

Mass = 607.6 × 1g = 607.6 g

Therefore, the estimation will be 607.6g

Explanation:

a. Average speed = distance / time

= 100 m / 70 s

= 1.43 m/s

b. Average displacement = displacement / time

= 0 m / 70 s

= 0 m/s

Distance is the length of the path traveled.  Displacement is the difference between the final position and initial position.

Given:-

To be calculated:-

Calculate its volume.

Formula used:-

Density = Mass/volume

=> 25 = 125/Volume

=> Volume = 125/25

=> Volume = 5 cm³

Answer:

3. you need to ask your available lab instructors what to do.

4. You immediately have to drop down your cloth and roll it to extinguish the fire or move to the emergency shower if available

5. You have too keep calm and report to the lab instructor but do no shout.

6. Move immediately to the eye rinse basin if available and wash your eyes gently and thoroughly

Answer:

a person climbs a set of stairs

Explanation:

A person climbing a set of stairs increases his height, which also increases his gravitopotential energy. Gravitopotential energy increases with height as you move further away from the surface of the Earth.

A wind up toy winding down is already expending its stored up potential energy. An apple falling from a tree is already losing its gravitipotential energy. A firecracker that explodes is already using up the potential energy stored in its chemical. All these are cases where the potential energy is decreasing.

Explanation:

It is given that, a cross-country skier moves 32 meters westward, then 54  meters eastward, and finally 68 meters westward.

The attached figure shows the whole scenario. He starts walking 32 m west and finally it walks 68 m west.

Let west is negative and east is positive.

Displacement = final position - initial position

= -68 - (-32)

= -36 m

The magnitude of displacement is equal to 30 m westwards.

Explanation:

When spring is used to shoot an arrow, the Elastic Potential Energy is converted into Kinetic Energy.

The efficiency of Spring Toy = 69%

According to Conservation of Energy :

P. E. = K. E.

NOW,

69% of P. E. = m * v^2 / 2

[tex]P.E. = \frac{0.0342 \times 5.5 \times 5.5}{2 \times 0.69} = 0.75J[/tex]

Answer: Yes. Please find the answer in the explanation.

Explanation:

Yes. Since velocity is a vector quantity, that is, it has both magnitude and direction.

If the displacements covered are not of the same direction, the velocity will not also of the same direction.

Take for instance, if the velocity in a positive is 40 m/s and velocity in the opposite direction is - 20 m/s . Then, the resultant velocity will be 40 - 20 = 20 m/s

Therefore,  it is possible that at any time during their trip their velocity was -20 m/s.

Explanation:

One parsec is the distance to an object whose parallax angle is one arcsecond. The radius of the Earth's orbit equals one astronomical unit (AU), so an object that is one parsec distant is 206,265 AU (or 3.26 light-years) away

Answer:

Parsec is a unit of distance used in astronomy, equal to about 3.26 light years (3.086 × 10^13 kilometres). One parsec corresponds to the distance at which the mean radius of the earth's orbit subtends an angle of one second of arc.

Hope this helps!

Answer:

2u

Explanation:

2u

W = Vq

q = CV

W = V.CV

W = CV²

W/C = V²

V = √(W/C)

√(W1/C1) = √(W2/C2)

√(u/c) = √(x/2c)

x = 2u

Answer:

Fundamental units are the units of the fundamental physical quantities in SI system. They are not formed from other units. There are a total of seven fundamental units such as meter, kilogram, ampere, and second. Derived units are those units that are used for derived quantities.

Explanation:

Hope it helps

Answer:

Newtons law of universal gravitation is the phenomena in which Newton said that every particle in environment will attract other particles in the space.  

Explanation:

Newton law of motion and gravitation attract forcefully which is direct proportional to the masses of the particles and inversely proportional to the square of the distances between the centers. Other physicist used Newtons law in research related to motion or to find out the distance between earth and sun. Because this law is about the mass of the objects. When the mas of an object is doubled, the force between the objects get too doubled. When the mass of the two objects is doubled the gravitational pull between these two objects gets doubled. Sir Isaac Newton first gave this law when see fall down an apple from tree.

Formula is : F = G  Mm/r2 Here G is gravitational pull that is constant.

Answer:

Neither A nor B

Explanation:

The charge rate of a battery is the rate at which charge is added to the battery in a given time unit. The unit of charge rate is Coulombs/second or amps

The time to charge a battery, is given by  the battery charging formula which is given as follows;

Battery charging time, t = Battery Ah(Ampere hour)/(Charging current, A)

T = Ah/A

Where;

T = Time (Hours)

Ah = The rating of the battery in Ampere Hour

A = The Current applied given in Amperes

The charging current should 10% of the Ah battery rating, such that a 120 Ah battery requires about 12 Amperes charging current

However, due to losses in the system, the current can be set at 13A

the time for charging will then be t = 120/13 = 9.23 hours

Answer:

--->

Explanation:

1. Air Resistance- this is a type of frictional force that acts upon objects as they travel through air. It usually opposes the motion of an object and it is mathematically difficult to predict its value.

2. Gravity- the force of gravity is the force that the earth, and moon use to attract an object towards itself. The moon has far less gravity than earth. All objects on earth experience a force of gravity that pulls them downward, towards the center of the earth.

3. Tension- the tension force is the force that is transmitted through a string, rope, cable or wire when it is pulled from opposite ends. The tension force is directed along the length of the wire and pulls equally on the objects on the opposite ends of the wire

4. Friction- this is the force exerted by a surface when an object moves across it. Friction results from the two surfaces being pressed together closely.

5. Electromagnetic force- although they don't seem similar, electricity and magnetism are related. Flowing electrons produce magnetism, and a moving magnet produces electricity.

6. Upthrust- this is the upward force that a liquid or gas exerts on a body floating in it.

7. Spring force- The spring force is the force exerted by a compressed  spring upon any object that is attached to it. This object is always acted upon by a force that restores the object to its rest or equilibrium position.

8. Applied force- An applied force is a force that is applied to an object by a person or another object.

9. Electrostatic force- The types of forces exerted by all electrically charged bodies on another charged bodies in the universe are ‘electrostatic forces’. They can be either positively or negatively charged.

10. Nuclear force- these are the forces that act between two or more nucleons. They bind protons and neutrons into atomic nuclei. The nuclear force is about 10 millions times stronger than the chemical binding that holds atoms together in molecules.

Answer:

Walked on a circular nature trail

Explanation:

We are told that you walked 3 miles.

Now, we are also told that the reference point used to calculate the total distance that you walked was the same as the ending point.

For, one to end up at the same place where he started a journey using the same reference point, it means the journey was not a straight line but a circle because the radius would have to be constant for that to happen.

Thus, it means you walked on a circular nature trail.

Answer:

Explanation:

In this problem we are expected to calculate the velocity of Georges movements.

Given data

Total distance covered by  George= 850+250= 1100 meters

Time taken  by  George to cover the total distance= 25 seconds

We know that velocity is, v= distance/ time

Therefore substituting our data into the expression for velocity we have

v= 1100/ 25= 44 m/s

Hence the velocity in m/s is 44

The velocity of George is 44 m/s.

Since

Total distance covered by  George= 850+250= 1100 meters

Time is taken by  George to cover the total distance= 25 seconds

We know that

velocity is, v= distance/ time

So,

v= 1100/ 25

= 44 m/s

Hence the velocity in m/s is 44.

Learn more about velocity here: https://brainly.com/question/13568037