Wednesday

June 29, 2016
**physics **

How much will it cost you (in cents) to operate a 29 Ω electric skillet on a standard 120 V outlet for 5 hours and 36 minutes? The unit price for electrical energy in this case is 7.350 cents/kWh.
*Friday, April 8, 2016 by Jay*

**physics **

1. A typical household circuit is capable of carrying 15.0 Amps of current at 120 V before the circuit breaker will trip. How many 1500-W hair dryers can run off one such circuit? In the rush to get ready for lecture, a physics professor leaves the hair dryer described in the ...
*Friday, April 8, 2016 by Jay*

**Physics**

1 m pendlum on Earth has a period of 2 s. What would it's period be on the moon where the acceleration due to gravity is 1.63 m/s2 ?
*Friday, April 8, 2016 by Aminah *

**physiçs**

What precautions shouĺd i apply when doing a coefficieñt of friction.force applied to a blocķ on a hořizontal plane?
*Friday, April 8, 2016 by Anonymous*

**physics**

A mass of 6•5 kg has a weight of 20N on a certain planet calculate the acceleration due to gravity on this planet?
*Thursday, April 7, 2016 by boniface*

**Physics**

An 80 kg hunter gets a rope around a 400 kg polar bear. They are stationary and on frictionless level ice, initially 60 m apart. When the hunter pulls the polar bear to him, the polar bear will move: 1. 10 m 2. 30 m
*Thursday, April 7, 2016 by Anonymous*

**Physics**

A(n) 12600 lb railroad car traveling at 7.4 ft/s couples with a stationary car of 6490 lb. The acceleration of gravity is 32 ft/s2. What is their velocity after the collision?Answer in units of ft/s. What impulse did the first car receive?Answer in units of lb s.
*Thursday, April 7, 2016 by Anonymous*

**Physics**

An ocean liner leaves New York City and travels 26.9 ° north of east for 217 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship's displacement vector in the directions (a) due east and (b) due north?
*Thursday, April 7, 2016 by Jane*

**physics**

Consider air to be a mixture of 80% nitrogen and 20% oxygen. How much work is required to raise the temperature of 7 mol of air by 9 ∘C in an adiabatic process?
*Thursday, April 7, 2016 by lizbeth*

**Physics**

A 0.19 kg ball of dough is thrown straight up into the air with an initial speed of 13 m/s.The acceleration of gravity is 9.81 m/s. b) What is its momentum halfway to its maximum height on the way up? Answer in units of kg · m/s.
*Thursday, April 7, 2016 by Anonymous*

**Physics**

A 5.8 kg object is accelerated from rest to a speed of 53.3 m/s in 55 s. What average force was exerted on the ob- ject during this period of acceleration? Answer in units of N.
*Thursday, April 7, 2016 by Bob*

**Physics **

A 2.30 kg block is initially at rest on a horizontal surface. A horizontal force ModifyingAbove Upper F With right-arrow of magnitude 4.92 N and a vertical force ModifyingAbove Upper P With right-arrow are then applied to the block (see the figure). The coefficients of ...
*Thursday, April 7, 2016 by Sara*

**physics**

A mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.35 cm. If the spring constant is 222 N/m and the mass is 0.580 kg, determine the mechanical energy of the system. Determine the maximum speed of the mass. Determine the maximum ...
*Thursday, April 7, 2016 by Anonymous*

**Physics**

Two golf carts are driving towards each other. The first has a mass of 390 kg and is driving east at 20 m/s. The second has a mass of 500 kg and is driving west at 8 m/s. When the two collide their bumpers lock and are stuck together, what is the final speed of the connected ...
*Thursday, April 7, 2016 by Kevin*

**Physics**

A man is in a boat out away from shore. The mass of the man and the boat is 188 kg. The boat is not moving. The man throws and anchor with a mass of 22 kg straight out from the boat with a speed of 13.8 m/s. What is the resulting speed of the boat?
*Thursday, April 7, 2016 by Kevin*

**Physics**

A meter stick has mass 39 g, and has a pivot placed at the center at the 50 cm mark. A mass of m1 is place at the 5 cm mark. Another mass of 10 g is placed at the 70 cm mark. What mass m in grams has to be placed at the 80 cm mark to create translational and rotational ...
*Thursday, April 7, 2016 by Dridien*

**physics **

A certain pendulum on Earth has a period of 1.6 s. What would be the period of this pendulum if it were taken to another planet that had 1.75 times the mass of the Earth and 2.5 times the Earth's radius? Express your answer in seconds to three significant digits.
*Thursday, April 7, 2016 by Zac*

**physics**

A house painter stands 3.0 m above the ground on a 5.0-m-long ladder that leans against the wall at a point 4.7 m above the ground. The painter weighs 680 N and the ladder weighs 120 N. Assuming no friction between the house and the upper end of the ladder, find the force of ...
*Thursday, April 7, 2016 by nada*

**physics **

With what frequency would you have to push a child on a swing that had supporting chains that were 2.3 m long? Express your answer in Hz to 3 significant digits.
*Thursday, April 7, 2016 by Zac*

**physics **

A simple harmonic oscillator has a frequency of 2.05 Hz. What will be its amplitude of oscillation if it's started from its equillibrium position with a velocity of 1.9 m/s? Express your answer in m to three significant digits.
*Thursday, April 7, 2016 by Zac*

**Physics - urgent**

A pipe 0.14 meters long and capped at one end exists in a room where the speed of sound is 350 m/s. Determine the three lowest frequencies that will resonate within the tube. [Enter the frequencies in order from lowest to highest.]
*Thursday, April 7, 2016 by Ayden*

**Physics**

A girl standing on a stationary uniform plank 10m long. The plank can move with negligible friction along the surface of the water. A) the girl walks along the plank with a velocity of 2ms-1 relative to the plank until she reaches the end of the plank. The centre of mass of ...
*Thursday, April 7, 2016 by Peter*

**Physics**

A certain circuit consists of an inductor of 50 mH in series with a resistor of 130 Ω. At one moment, the current in the circuit is 12 A, and decreasing. How long will it take for the current to fall to 4.8 A? Answer in units of s.
*Thursday, April 7, 2016 by Ayo*

**Physics**

A 0.26 mH inductor has a length that is four times its diameter. If it is wound with 34.4 cm−1 turns per centimeter, what is its length? Answer in units of m.
*Thursday, April 7, 2016 by Ayo*

**Physics**

A string of length L vibrates with a fundamental frequency f when under a tension of 100 N. What is the fundamental frequency of the string when its tension is increased to 2500 N?
*Thursday, April 7, 2016 by Ayden*

**Physics**

the weight of the block if wood is 96.5 N. the coefficient of static friction between the block of wood and vertical wall is 0.45. what minimum force is required to prevent the block from sliding down the wall
*Wednesday, April 6, 2016 by Serge*

**Physics**

When the rubber band in a slingshot is stretched, it obeys Hooke's law. Suppose that the "spring constant" for the rubber band is k = 44.2 N/m. When the rubber band is pulled back with a force of 9.38 N, how far does it stretch?
*Wednesday, April 6, 2016 by Shakira*

**Physics**

A figure skater is spinning with an initial angular speed of 5.6rad/s. He then pulls his arms in, reducing his moment of inertia to 0.31 times its original value. What is his angular speed after pulling in his arms?
*Wednesday, April 6, 2016 by Timone*

**Physics**

A 3.50-kg bucket is attached to a cylindrical, massive pulley with a radius of 0.440 m. The bucket starts from rest and falls for 1.3 s into a well. The tension in the rope is 13.03N. What is the magnitude of the linear acceleration of the falling bucket?
*Wednesday, April 6, 2016 by Timone*

**Physics**

A horizontal circular platform (m = 110.1 kg, r = 3.21m) rotates about a frictionless vertical axle. A student (m = 98.3kg) walks slowly from the rim of the platform toward the center. The angular velocity, omega, of the system is 3.9 rad/s when the student is at the rim. Find...
*Wednesday, April 6, 2016 by Emily *

**Physics 1**

A textbook of mass 1.95 kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.100 m , to a hanging book with mass 3.08 kg . The system is released from rest, and the books are observed to move a distance 1.27 m ...
*Wednesday, April 6, 2016 by David*

**11 physics**

a20Kg box is suspended from the ceiling by arope that weighs 1Kg . find the tension at the top of the rope.
*Wednesday, April 6, 2016 by biks*

**Physics**

An AC power supply operating at a frequency of 220 Hz is connected across an inductor. The maximum voltage of the source is 4 V, and the maximum current is 65 mA. What is the inductive reactance? What is the inductance of the circuit?
*Wednesday, April 6, 2016 by SomeoneSexy*

**Physics**

A steam-electric power plant delivers 900 MW of electric power. The surplus heat is exhausted into a river with a flow of 2.91×105 kg/s, causing a change in temperature of 1.07 oC. A. What is the efficiency of the power plant? B. What is the rate of the thermal source? ...
*Wednesday, April 6, 2016 by Abbey*

**Physics**

Calculate the formula for coefficient of kinetic friction in an inclined plane with a pulley and two masses coonected by a rope. You can only use the weight of the two masses, the height where the second object is and the distance that the first object does and the angle of ...
*Wednesday, April 6, 2016 by Arthur*

**PHYSICS**

When a person wears a hearing aid, the sound intensity level increases by 35 dB. By what factor does the sound intensity increase?
*Wednesday, April 6, 2016 by Orla*

**PHYSICS**

An amplified guitar has a sound intensity level that is 11 dB greater than the same unamplified sound. What is the ratio of the amplified intensity to the unamplified intensity?
*Wednesday, April 6, 2016 by Orla*

**PHYSICS**

Assuming an object at infinity, a person has far points of 5.2 m from the right eye and 6.2 m from the left eye. Describe the lens required (diopters) as seen in a prescription for the refractive power of each corrective contact lens.
*Wednesday, April 6, 2016 by Orla*

**physics **

The distance between the lenses of a microscope is 18 cm. The focal length of the eyepiece is 1.8 cm. If the microscope is to produce an angular magnification of -260 when used by a person with a normal near point (20 cm from the eye), what must the focal length of the ...
*Wednesday, April 6, 2016 by Orla*

**Physics **

An object has an angular size of 0.0140 rad when placed at the near point (20.0 cm) of an eye. When the eye views this object using a magnifying glass, the largest possible angular size of the image is 0.0490 rad. What is the focal length of the magnifying glass?
*Wednesday, April 6, 2016 by Orla*

**Physics **

The mass of a string is 6 grams, and it is stretched so that its tension is 150 N. A transverse wave travelling on this string has a frequency of 160 Hz and a wavelength of 0.40 m. What is the length of this string? (ii) A chain saw has a measured sound level of 80 dB. What is...
*Wednesday, April 6, 2016 by Orla*

**PHYSICS**

A string on a violin is tuned to vibrate at a fundamental frequency of 65.0 Hz. If the tension in the string were increased by a factor of three, what would be the new fundamental frequency?
*Wednesday, April 6, 2016 by Orla*

**physics**

Use conservation of energy to determine the angular speed of the spool shown in the figure below after the 3.00 kg bucket has fallen 4.05 m, starting from rest. The light string attached to the bucket is wrapped around the spool and does not slip as it unwinds. the spool, ...
*Wednesday, April 6, 2016 by david*

**Physics**

An ac power supply with frequency 60 Hz is connected to a capacitor C=40uF. The maximum instantaneous current that passes through the circuit is 2.26A. What is the maximum voltage?
*Wednesday, April 6, 2016 by SomeoneSexy*

**Physics**

1. Does the center of gravity coincide with the fulcrum? Why? 2. why does a meter stick balance if the moments in one side equals the moment on the right side? 3. When do you solve for percent difference? Percent error?
*Wednesday, April 6, 2016 by help me please*

**physics**

!.How does work affect power with time constant? 2.how does the weight of the stair-climber affect work and power?
*Wednesday, April 6, 2016 by jerdean*

**Physics**

Please solve and answer. Need done ASAP. A speeder passes a parked police car at 35.0 m/s. The police car starts from rest with a uniform acceleration of 2.39 m/s2. (a) How much time passes before the speeder is overtaken by the police car? __ s (b) How far does the speeder ...
*Tuesday, April 5, 2016 by Cheyenne*

**Physics**

an object is dropped from rest the top of a building 19.6 m hi. calculate the a) time for the object to reach the ground and b) object's speed just before it strikes the ground
*Tuesday, April 5, 2016 by Rocio*

**physics**

A ball bounces to 34 percent of its original height. *1) What fraction of its mechanical energy is lost each time it bounces? *2) What is the coefficient of restitution of the ball-floor system? - I was able to solve part one and get an answer of .66, but part two I don't ...
*Tuesday, April 5, 2016 by David*

**physics**

A ball bounces to 34 percent of its original height. *1) What fraction of its mechanical energy is lost each time it bounces? *2) What is the coefficient of restitution of the ball-floor system? - I was able to solve part one and get an answer of .66, but part two I don't ...
*Tuesday, April 5, 2016 by David*

**Physics (light)**

A soap film is viewed in white light. If the film is much thinner than the wavelength of blue light, what is the appearance of the film? The soap film appears totally transparent because it reflects no visible light. The soap film appears blue because all others colors are ...
*Tuesday, April 5, 2016 by jacob*

**physics**

The system of small objects shown in the figure below is rotating at an angular speed of 2.0 rev/s. The objects are connected by light, flexible spokes that can be lengthened or shortened. What is the new angular speed if the spokes are shortened to 0.15 m? 1.0m x 1.0m distance.
*Tuesday, April 5, 2016 by mark*

**physics **

A meter stick is rotated about the end labeled 0.00 cm, so that the other end of the stick moves through an arc length of 6.20 cm. Through what arc length s does the 25.0-cm mark on the stick move? any help, please?
*Tuesday, April 5, 2016 by Madison Smith*

**physics**

A 1400-N uniform boom at ϕ = 70.0° to the horizontal is supported by a cable at an angle θ = 20.0° to the horizontal as shown in the figure below. The boom is pivoted at the bottom, and an object of weight w = 2250 N hangs from its top. (a) Find the tension ...
*Tuesday, April 5, 2016 by mark*

**PHYSICS. HELP!my work **

two force of 20N and 34N act on a body in such a way that they make an angle of 35 with each other. find the resultant of the two force
*Tuesday, April 5, 2016 by shemsa *

**Physics**

A pendulum with length of 80cm was set vibrating on the moon. It takes 1.08s to travel between a point of maximum velocity to the next point of velocity. What is the period of ascillation?
*Tuesday, April 5, 2016 by Wissal*

**physics**

A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternative to batteries in electric ...
*Tuesday, April 5, 2016 by reghuir*

**physics**

an inclined plane, which slopes at 37degree is used to raise a 10 kg object to a heghit of 4m if the efficency is 80% determine a,the load (t@ke sin 37=0.6,cos 37 =0.8) b,the cofficent of kinetic friction c,the effort force
*Tuesday, April 5, 2016 by sami*

**Physics**

A block of mass 0.585 kg is placed on the end of a spring which has a stiffness of 294 N/m. It is pulled down 2.80 cm and released. What is the frequency of oscillation?
*Tuesday, April 5, 2016 by Em*

**Physics**

A block with a mass of 0.357 kg is attached to a spring of spring constant 599 N/m. It is sitting at equilibrium. You then pull the block down 4.80 cm from equilibrium and let go. What is the amplitude of the oscillation? I know A=D/F... I keep getting the wrong answer though...
*Tuesday, April 5, 2016 by Em*

**physics**

When is the kinetic energy equal to zero?
*Tuesday, April 5, 2016 by sara*

**Physics- Optics**

A double lens system is made of +35.0 cm lens (lens #1) and a - 26.0 cm lens (lens #2). Lens #1 is placed at x = 0 cm on a meter stick and lens #2 is placed at x = 30.0 cm. Where on the meter stick will the final image be formed when looking at a distant object? s2"=f2(f1...
*Tuesday, April 5, 2016 by B*

**Physics-Lens**

The focal length of your camera lens is 70mm. It is used for taking pictures of your friend who is 1.5m tall. What is your friends distance from the lens if the image just fills the 24mm vertical dimension of the film? I tried M=hi/ho=.16 .16=di-f/f di=-68.88
*Tuesday, April 5, 2016 by B*

**Physics**

Blue light (λ vac= 440 nm) shines onto a puddle of water (n water = 1.33). There is a thin layer of oil (n = 1.47) on top of this water. What is the minimum thickness of the oil if there is constructive interference for the light? I tried 2t=(m+ 1/4)λ/noil but it ...
*Tuesday, April 5, 2016 by B*

**Physics**

A 25 N box is pulled vertically upward by means of a cord.Find the acceleration of the box if the tension in the cord is 35 N.
*Tuesday, April 5, 2016 by Arcel*

**PHYSICS PLS GUYSS**

What does the slope of a Kinetic Energy V.S Gravitational Potential Energy graph represent? I found 1 but I dont know what it represents I know that PE+KE=constant
*Tuesday, April 5, 2016 by Amelie*

**Physics **

Span of a bridge is 32.0m and has a mass of 5.38x10^4 kg. A truck of mass 11700kg is stopped at 11.4m from one end. Find upwards force that must be exerted by each pair
*Tuesday, April 5, 2016 by Sihle*

**physics**

How can we increase the rate of change of magnetic flux? ( i want to check my answer)? Can it be : a) using a stronger magnet b) increasing the rate of movement of the conductor? are these correct?? both of them
*Tuesday, April 5, 2016 by clive*

** physics**

A car starts travelling from rest and undergoes constant acceleration for 10 seconds. If it is travelling at 6m/s after 3 seconds what will be its final velocity?
*Tuesday, April 5, 2016 by anabelle*

**Physics**

You and your little cousin sit on a see-saw. You sit 0.39 m from the fulcrum, and your cousin sits 1.53 m from the fulcrum. You weigh 620 N. How much does she weigh?
*Monday, April 4, 2016 by Tim*

**PHYSICS!!! **

A skier traveling 12.0 m/s reaches the foot of a steady upward 18 degree incline and glides 12.2 m up along this slope before coming to rest. What was the average coefficient of friction?
*Monday, April 4, 2016 by Anne*

**PHYSICS!!!!**

It is 5.0 km from your home to the Physics lab and your car is out of gas. You could run that distance at 10 km/h, which uses up energy at the rate of 700 W; or you could walk it leisurely at 3.0 km/h, which uses energy at 300 W. (a) Calculate how much energy both choices ...
*Monday, April 4, 2016 by TOM*

**Physics **

A sledder has 800 J of potential energy and 200 J of kinetic energy at one point on a steep hill. How much kinetic energy will the sledder have at the bottom of the hill? (Assume negligible air resistance and friction.)
*Monday, April 4, 2016 by Rickyia *

**PHYSICS!!**

It is 5.0 km from your home to the Physics lab and your car is out of gas. You could run that distance at 10 km/h, which uses up energy at the rate of 700 W; or you could walk it leisurely at 3.0 km/h, which uses energy at 300 W. (a) Calculate how much energy both choices ...
*Monday, April 4, 2016 by Vanessa*

**Physics--Angular Momentum**

A square shaped block of mass m travels to the right with velocity v on a frctionless table surface. The block has side-length 2a. The block hits a very small, immovable obstacle on the edge of the table and starts to tip. The block has moment of inertia I=(2/3)ma^2 about an ...
*Monday, April 4, 2016 by Help PLZZZZZZZZ*

**PHYSICS!!**

A person thought it would be a good idea to change a tire on the side of a hill. The tire has a width of W = 0.30 m and a radius of R = 0.40 m. The inside of the wheel is empty, but the wheel is solid from a radius of R/2 to R with uniform density. The density of the material ...
*Monday, April 4, 2016 by Vanessa*

**PHYSICS!!**

The human body loses heat at a rate of 120W when sitting quietly at rest. If a 65 kg student takes 100 hours to read War and Peace by Leo Tolstoy, how high could they have been lifted if all the heat energy lost was utilised to lift them against gravity (assuming that the ...
*Monday, April 4, 2016 by Vanessa*

**Physics**

A 21-kg child starts at the center of a playground merry-go-round that has a radius of 3.5 m and rotational inertia of 500 kg⋅m2 and walks out to the edge. The merry-go-round has a rotational speed of 0.20 s−1 when she is at the center. What is its rotational speed...
*Monday, April 4, 2016 by Jordann *

**Physics**

water leaves a hose at a rate of 1.5 kg/s with a speed of 20m/s and its aimed at the side of a car, then splashes back from the car at a speed of 18m/s. what is the average force between the water and car during contact?
*Monday, April 4, 2016 by Gabrielle*

**physics**

consider a series R-C circuit consisting of a 30 ohm resistor and 20*10^-6F capacitor connected to a 100V,50Hz power supply.find the magnitude of the current and the angle by which the current leads the voltage.
*Monday, April 4, 2016 by ruth*

**physics**

consider an inductive circuit suppose we want the current amplitude in a radio reciever to be 250*10^-6 A when the voltage amplitude is 3.6V at a frequency of 1.6MHz. what inductance reactance is needed?what inductance is needed?
*Monday, April 4, 2016 by selina*

**Physics**

a merry-go-round of radius 2 m and a moment of inertia 651 kgmm is stationary. a 78 kg woman runs at 1.6 m/s and jumps on tangentially to the rim of the merry-go-round. what is the final angular velocity of the merry-go-round?? 0.383 rad/s? 17.672 rad/s? 0.554 rad/s? 0.259 rad...
*Monday, April 4, 2016 by Anonymous*

**physics**

A space station consists of two donut-shaped living chambers, A and B, that have the radii shown in the drawing. As the station rotates, an astronaut in chamber A is moved 1.99 102 m along a circular arc. How far along a circular arc is an astronaut in chamber B moved during ...
*Monday, April 4, 2016 by jb*

**Physics**

A force of 5.0 N acts on a 15 kg body initially at rest. Compute the work done by the force in (a) the first,(b) the second, and (c) the third seconds and (d) the instantaneous power due to the force at the end of the third second.
*Monday, April 4, 2016 by Hammad*

**Physics**

A circular dam has a radius of 10.0 m and a height of 3.0 m. Of the dam will be filled with water from a pipe with an inside diameter of 10 cm and a water flow of 10 litres per second, calculate the time taken to fill the dam to a point 10 cm from the top of the dam.
*Monday, April 4, 2016 by Basil*

**physics**

When a spring is compressed by 3 cm it's P.E. Is U..it's P.E when it is compressed by 6 cm
*Monday, April 4, 2016 by kritika*

**physics**

A car cruise down an expressway at 25m/s it decelerates for 2m/s and last for 3secs. (a) what velocity will the car have at the end (b) calculate the distance the car would cover
*Monday, April 4, 2016 by Olamide *

**physics **

How to distinguish between a stationary wave and a progressive wave?
*Monday, April 4, 2016 by Aya *

**physics**

Can the value of equilibrant be equal to zero? If yes, why?
*Monday, April 4, 2016 by christina*

**physics **

From the roof of a 64 metres high building a ball was thrown which is of 5kg mass.how long it takes to reach the ground? Please show the process with answer
*Monday, April 4, 2016 by Zarine*

**physics **

A cricket ball is thrown vertically upward and it ups and downs for 6 seconds.what is the maximum height of it and how much does it take time to reach the height?
*Monday, April 4, 2016 by Zarine*

**Physics**

In the figure below, a wheel of radius 0.275 m is mounted on a frictionless horizontal axle. A massless cord is wrapped around the wheel and attached to a 1.95 kg box that slides on a frictionless surface inclined at angle θ = 32.7 ° with the horizontal. The box ...
*Sunday, April 3, 2016 by Kimberley*

**physics **

What is the maximum velocity of a spring oscillator with a mass of 0.7 kg and a spring constant of 74 N/m that is released from rest at a position of x = 0.1 m?
*Sunday, April 3, 2016 by Zac*

**physics **

A mass hung from a spring stretches the spring by 11 cm when the mass is resting at its equillibrium position. What will be the frequency of oscillation of this system if the mass is put in motion?
*Sunday, April 3, 2016 by Zac*

**Physics 203**

A spring has its right end fixed and is installed on a horizontal table so that the free end, at equilibrium, is at x=3.00m. A 1.65kg block coming from the left slides along the table. When it passes the origin, it is moving at 5.58m/s. It strikes the spring, compresses it ...
*Sunday, April 3, 2016 by Dorian *

**physics**

prove that I=square root of (I^2avarage). using I=Iosin(wt)
*Sunday, April 3, 2016 by ruth*

**physics**

find heat 45 g at 43c to 23 caculate sph
*Sunday, April 3, 2016 by nuradiin*

**physics**

A playground merry-go-round of radius 2.00 m has a moment of inertia I = 255 kg·m2 and is rotating about a frictionless vertical axle. As a child of mass 25.0 kg stands at a distance of 1.00 m from the axle, the system (merry-go-round and child) rotates at the rate of ...
*Saturday, April 2, 2016 by jojo*

**physics**

The system of small objects shown in the figure below is rotating at an angular speed of 2.0 rev/s. The objects are connected by light, flexible spokes that can be lengthened or shortened. What is the new angular speed if the spokes are shortened to 0.15 m? (An effect similar ...
*Saturday, April 2, 2016 by jojo*

**physics**

In a circus performance, a large 5.0 kg hoop of radius 3.0 m rolls without slipping. If the hoop is given an angular speed of 3.0 rad/s while rolling on the horizontal and allowed to roll up a ramp inclined at 10° with the horizontal, how far (measured along the incline) ...
*Saturday, April 2, 2016 by jojo*