An elevator cable winds on a drum of radius 771 cm that is connected to a motor.
If the elevator moves down 8.60 m, how many revolutions has the drum made?

Answers

Answer 1

The relationship between the length of the circle and its radius allows to find the result for the revolutions turned when the distance decreases  8.60m is:

           Angle = 17.8 rev

The length of a circle is given by the expression.

         L = 2π r

Where L is the length of the circle and r is the radius of the circle.

They indicate the radius of the drum is r = 7.71 cm = 7.71 10⁻² m, let's find the length of the circle.

         Lo = 2 π 7.71 10⁻²

         Lo = 0.4844 m

Let's find the angle that the drum has rotated, using a direct proportional rule. If rotate an angle of 2π radians when you descend 0.4844 m, what angle you rotate when you descend 8.60 m.

          #_ angles =  [tex]8.6 m \ \frac{2\pi \ rev} { 0.4844 m}[/tex]  

          #_angle = 111.55 radians

Let's reduce to revolutions.

         # _angles = 111.55 radians ( [tex]\frac{1 rev }{2\pi rad}[/tex] )

         #_angulo = 17.8 rev

In conclusion, using the relationship between the length of the circle and its radius, we can find the result for the revolutions turned when the distance decreases is:

           Angle = 17.8 rev

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Related Questions

Several lawmakers argue that constructing coal plants is a necessity. Which statement describes scientific evidence people can use to disagree with the lawmakers’ claim?

Burning fossil fuels increases greenhouse gas emissions.
Coal mining creates many kinds of jobs.
Energy production rates are the highest with the use of coal plants.
Forests are destroyed as storage facilities for electricity are constructed.

Answers

Answer:

Burning fossil fuels increases greenhouse gas emissions.

Waves can travel but the medium does not "travel" with it, even though they may move up and down.

False
True

Answers

Answer:

TRUE

Explanation:

The  statement "Waves can travel but the medium does not "travel" with it, even though they may move up and down." is a true statement

Option A is correct

What are Waves?

A wave is simply defined as a disturbance in a medium that carries energy from point to point and can take the form of elastic deformation, a change in pressure, magnetic strength, electric potential, or temperature.

In conclusion, Mediums are the pathways or channel for travelling waves

Read more about Wave

https://brainly.com/question/3004869

If a person paddles a canoe up a creek, a distance of 13.09 km, how fast does she need to move in order to get to the end of the creek within 2.371 hours?

Answers

Answer:

Below

Explanation:

To find the velocity of the person you can use this formula

     velocity = displacement / time

     velocity = 13.09 km / 2.371 hours

     velocity = 5.5208 km/h

                   = 5.521 km/h

Hope this helps!

When Beakman pushes Liza back of the swing he is storing _____ energy.

A. stopped
B. moving
C. potential
D. kinetic

Answers

D kinetic energy

converts potential energy to kinetic energy, then kinetic energy back into potential energy, over and over again. The kinetic energy is the fast part of swinging; it's the speed you have as you rush back and forth.

Once you start pulling your object with less force than friction, what should you expect your object to do? What about when your object is pulled with more force than friction?​

Answers

#Case -1

If Pulling force is less than frictional force the object won't move .

#Case-2

If Pulling force is greater than frictional force then object will be .

In order to calculate friction force you need Limiting friction first .

[tex]\\ \sf\longmapsto F_L=\mu sN[/tex]

u s is coefficient of static friction and N is normal reaction

Or

[tex]\\ \sf\longmapsto F_L=\mu smg[/tex]

If a ball is kicked horizontally off of a building at 8.0 m/s, what is the horizontal velocity (vx) after 3
seconds?

Answers

The characteristics of the projectile launch allows to find the result for the velocity on the x axis is:

In the horizontal axis there is no acceleration and therefore the speed must be kept constant. The horizontal speed is  vₓ = 8.0 m / s

In projectile launching we have an application of kinematics to motion in two dimensions near the surface of the Earth.

In this case, on the vertical axis we have an acceleration directed towards the center of the planet and called the gravity acceleration.

In the horizontal axis or x axis there is not acceleration, except in special cases that we tone is how much the resistance of the air.

Consequently in the horizontal axis there is no acceleration and therefore the speed must be kept constant, the result for the horizontal speed is:

           vₓ = 8.0 m / s

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Can air make shadows?

Answers

Answer:

Yes, air can indeed make shadows. A shadow occurs when an object in a light beam prevents some of the light from continuing on in the forward direction. When the light beam hits a wall or the ground, a darker shape is visible where less light is hitting the surface. Refraction is responsible.

Explanation:

Here is a clip of an example of air making a shadow

https://www.seeker.com/stories/air-shadows/

A 20 N force pulls to the right and friction pulls 5 N. If the mass is 5 kg, find acceleration.​

Answers

Answer:

Explanation:

Force - frictional Force = m * a

20N - 5N = 5 * a

15N = 5*a

15N / 5 = a

a = 3 m/s^2

You should note a couple of things.

1. The frictional Force always opposes the direction of motion. In this case it is minus and the 20 N is plus. It makes the acceleration less. If the friction force was not there then 20 N = m * a

20N = 5 kg * a

a = 20/5

a = 4 m/s^2.

You throw a ball upward with an initial speed of 3.0 m/s from an initial height of 1.5 m. After you throw the ball, its acceleration is 9.81 m/s downward. Taking upward to be the positive direction, write the position-time equation for the ball's motion​

Answers

Answer: An object undergoing a constant acceleration can have its motions be described by the kinematic equations. These equations relate the position of the particle, its velocity, acceleration, and time.

Explanation:

Answer:

vf^2=vo^2+2ay(y1-y0)

Explanation:

For an experiment to produce useful data, what must happen?

A. It must be performed by a famous scientist.

B. It must prove a hypothesis correct.

C. It must be published in a famous journal.

D. It must be repeated several times.

Answers

Answer: D

Explanation: It must be repeated several times. (You could have different results everytime. Kind of like a dice. If you only roll it once and get a 3, you will only think it rolls a 3 unless you roll it and get different results or unless you've seen a dice before.)


A simple pendulum oscillates 40 times in 20 second. What is the time period of the pendulum?​

Answers

Time period =
Number of oscillations in time t
t

=
40
4

=0.1 s
Frequency =
Time period
1

=

what are the similarities between standard units and non-standard units? ​

Answers

Standard units of measurement are units of measurement that are typically used within each measurement system, such as inches, feet, ounces, pounds, kilograms, or cups. ... Nonstandard units of measurement are units of measurement that aren't typically used, such as a pencil, an arm, a toothpick, or a shoe.

Help ma pls !

As the sun goes down the air contains a certain amount of water vapor in the air then begins to cool and eventually the air reaches the dew point.

What is the dew point and what form at
this point?


please no bs ill mark the crown thingy thingy ​

Answers

Press the photo to see the answer I couldn’t put the explanation only the answer like you said no bs

Which are characteristics of matter? (Select all that apply.)

It has mass.

It only has one type of atom in it.

It is the smallest part of an element.

It takes up space.

Answers

Answer:

It has mass, it takes up space

Explanation:

A train slows down for 40 m/s to 10 m/s in 60 seconds how far does it travel in that time

Answers

Answer:

It will travel a distance of 1500 m within the time of 60 seconds.

What is represented in this picture? (50 points and brainliest for the correct answer!!!!)

Answers

Answer:

I don't know

Explanation:

Please give me Brainliest answer

Answer:

PRESSURE ???

you hit a ball with a bat. the ball acts on the bat, and the bat exerts equal and opposite force on the ball. This will cause the ball to be in (equilibrium or acceleration). Explain your answer.

Answers

Answer:

equilibrium because its equal force on the ball.

Explanation:

Answer:

good

Explanation:

The weight of an astronaut plus his space suit on the Moon is only 260 N.
how much is the weight on earth assuming the gravity on the moon is 1.67?

Answers

Answer:

2.68

Explanation:

sana maka tulong hehe
djddndndnd the answer is 2.68

Two balls were dropped at the same time from the top of a ladder. The balls are of equal size but ball A has more mass than Ball B. Which best describes the time it would take for the two balls to hit the ground

A .Not enough information
B. Ball B would hit the ground first
C. Ball A and B will hit the ground at the same time.

Answers

Answer:

A

Explanation:

If we ignore air resistance or friction, the balls would hit the ground at the same time. The question does not state whether or not there is air resistance.

If there was air resistance, ball A would hit the ground first.

Again, there is no information provided on whether is is air resistance or not, so there is not enough information.

how did you get your eye color?

Answers

Answer:

Humans get their eye color from Melanin, the protective pigment that also determines skin and hair shades. ... The little that isn't absorbed by the iris is reflected back, producing what we see as eye color. Now, that color depends on the kind and density of melanin a person is born with..

Explanation:

Hope it helps you..

Your welcome in advance..

(ㆁωㆁ)

ra body of mass x is raised to a height of 2m above the ground what it's potential energy if the body is allowed to fall what is it's kinetic energy when half way down​

Answers

Answer:

Explanation:

PE = mgh = 2xg

Half way down, half of the potential energy will have been converted.

KE = xg

how is the ionization, E, related to a period of elements?

Answers

Answer:

2 Answers. Ionization energies increase across a Period, and decrease down a Group.

Explanation:

Answer:

The ionization energy of an element increases as one moves across a period in the periodic table.

Explanation:

The electrons are held tighter by the higher effective nuclear charge.

At the instant shown in Figure 3, the blocks are moving toward each other with the same speed of 0.35 m/s. The blocks collide 0.50 seconds later. What is the speed of the two=block system's center of mass just before the blocks collide?

Answers

Answer:

The blocks c

Explanation:

A snowboarder drops from rest into a halfpipe of radius R and slides down its frictionless surface to the bottom

(a) Show that the snowboarder's speed at the bottom of the halfpipe is
v = 2gR (use conservation of energy)
(b) Show that the snowboarder's centripetal acceleration at the bottom is
ac = 2g (Apply the expression for centripetal acceleration)
(c) Show that the normal force on the snowboarder at the bottom of the halfpipe has a magnitude of 3mg (Use Newton's second law of motion)

Answers

A snowboarder drops from rest into a halfpipe of radius R and slides down its frictionless surface to the bottom, the snowboarder's speed is [tex]\mathbf{v = \sqrt{2gR}}[/tex]

The snowboarder's centripetal acceleration at the bottom is [tex]\mathbf{a_c = 2g}[/tex]. The normal force acting on the snowboarder at the bottom of the halfpipe = 3mg

According to the conservation of energy, at any given point of motion, the energy of a system will always be constant.

Using the conservation of energy at rest and also at the bottom of the pipe.

Total potential energy of the person(since its at rest = Total kinetic energy at the bottom of the pipe.

[tex]\mathbf{mgR = \dfrac{1}{2}mv^2}[/tex]

The objective is to make the velocity (v) the subject of the formula:

[tex]\mathbf{gR = \dfrac{1}{2}v^2}[/tex]

[tex]\mathbf{2gR = v^2}[/tex]

[tex]\mathbf{v = \sqrt{2gR}}[/tex]

(b)

Using the expression for centripetal acceleration;

[tex]\mathbf{a_c = \dfrac{v^2}{R}}[/tex]

here,

let's replace [tex]\mathbf{v \ \ \ with \ \ \sqrt{2gR}}[/tex];

Then;

[tex]\mathbf{a_c = \dfrac{(\sqrt{2gR})^2}{R}}[/tex]

[tex]\mathbf{a_c =2g}[/tex]

From the image attached below;

Provided that:

n = normal forcew = mg  weight of the person[tex]\mathbf{F_c}[/tex] = centripetal force

Then, we can infer that the normal net force acting on the person can be computed as:

[tex]\mathbf{F_c = n -mg}[/tex]

By rearrangement;

[tex]\mathbf{n =F_c +mg}[/tex]

where;

[tex]\mathbf{F_c = 2 mg}[/tex]

n = 2mg + mg

n = 3mg

Therefore, we can conclude that the snowboarder's speed, centripetal force, and normal force are proved.

Learn more about centripetal force here:

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a uniform rod 8m long weighing 5kg is supported horizontally by two vertical parallel strings at p and q and at distance 2m and 6m from one end.
Weight of 1kg, 1.5kg and 2kg are attached at distance of 1m 5m and 7m respectively from the same end.
find the tension in each vertical string

Answers

Answer:

Fp = 36 N

Fq = 58 N

Explanation:

Let the left end be the reference end with string p closest to it.

Let CCW moments be positive

Sum moments about p to zero

1(9.8)[2 - 1] + Fq[6 - 2] - 5(9.8)[8/2 - 2] - 1.5(9.8)[5 - 2] - 2(9.8)[7 - 2] = 0

                                                                              Fq[4] = 23.5(9.8)

                                                                                  Fq = 57.575 ≈ 58 N

Sum moments about q to zero

1(9.8)[6 - 1]  - Fp[6 - 2] + 5(9.8)[6 - 8/2] + 1.5(9.8)[6 - 5] - 2(9.8)[7 - 6] = 0

                                                                                                     Fp = 35.525 N

or

Sum vertical forces to zero

Fp + 57.575 - (9.8)(1 + 1.5 + 2 + 5) = 0

Fp = 35.525  ≈ 36 N

100k points pls solve asap or no points

Answers

Answer:

Explanation:

You have given us a very weird question. Things do not mesh

If the mass is 500 kg and sits 25 m above the lowest spot on the track, the potential energy is

PE  = mgh = 500(9.8)(25) = 122500 Joules,

not the reported 61250 Joules

So either the Joules is incorrect or the mass is supposed to be 250 kg.

In either case, in the absence of friction, the potential energy will convert to kinetic energy.

½mv² = mgh

     v = √2gh

which does not involve the use of either Joules or kilograms.

Maximum velocity when starting from rest is

v = √(2(9.8)25) = √490 = 22.135943...

v = 22 m/s

A 10 kg box initially at rest accelerates uniformly to a speed of 20 m/s in 2 seconds. Determine the A. energy gained by the block, B. Power developed by the box at the end of 10 seconds.​

Answers

Answer:

20 40

Explanation:

A 10 kg box initially at rest accelerates uniformly to a speed of 20 m/s in 2 seconds, energy gained by the block 2000 J and Power developed by the box at the end of 10 seconds 5000 Watt

What is work done?

The total amount of energy transferred when a force is applied to move an object through some distance

The work done is the multiplication of applied force with displacement.

Work Done = Force * Displacement

As given in the problem A 10 kg box initially at rest accelerates uniformly to a speed of 20 m/s in 2 seconds

By using the first equation of motion

v = u + at

20 = 0 + 2a

a = 10 m/s²

By using the third equation of motion

v² - u² = 2as

20² - 0² = 2×10×s

s = 400/20

s = 20 m

Force = ma

          = 10 ×10

          = 100 N

work done = Force × displacement

                   = 100 ×20

                   = 2000 J

Velocity after 10 seconds

V= u + at

  = 0 + 10×10

  = 100 m/s

work done after 10 seconds

= 1/2mv²

= 0.5×10×10²

=50000 J

Power = work done  / time

           = 50000/10

           = 5000 Watt

Thus, energy gained by the block 2000 J and Power developed by the box at the end of 10 seconds 5000 Watt

Learn more about work done here

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#SPJ2

How much gravitational potential energy is stored in a 2.0kg object that has been raised up to a height of 3.5m

Answers

Answer:

68.6 joules

Explanation:

g.p.e=mass × gravity × height

= 2 × 9.8 × 3.5

=68.6 joules

HELP ME PLS THIS IS DUE TODAY I NEED HELP!!!!

Answers

Explanation:

i wish I could help you but its not clear...

Consider three properties of the net force on an object: a magnitude, direction, and angle with respect to the objects path. For the following situation select the choice that indicates wether these quantities are constant or changing during the course of the motion.

1. The magnitude and the angle of the net force with respect to path are constant, but the direction is changing

2. The direction and the angle of the net force with respect to path are constant, but the magnitude is changing.

3. The magnitude and direction of the net force are changing, but the angle of the net force with respect to path is constant.

4. The magnitude, direction, and angle with respect to path for the net force are constant.

5. The magnitude and direction of the net force are constant, but the angle of the net force with respect to path is changing.

Answers

Answer:

Explanation:

yeah i dont know i need the answer too

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