Wednesday

June 29, 2016
**physics**

A 9.94-m ladder with a mass of 21.6 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 226 N. At the instant the top of the ladder leaves the ground, the ladder experiences an angular acceleration of 1.71 rad/s2 ...
*Tuesday, April 19, 2016 by nj*

**physics**

A 0.280 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with half the original speed of the first ball. (a) What is the mass of the second ball? (b) What fraction of the original kinetic energy (ΔKE/KE) ...
*Tuesday, April 19, 2016 by GG*

**physics **

A car with a mass of 1100kg can accelerate on a level road from rest to 2m/s in 14sec.what is the steepest slope this car can climb.(hint:the plane is smooth.)
*Tuesday, April 19, 2016 by lily*

**Physics**

A child sitting 1.80 m from the center of a merry-go-round moves with a speed of 1.45 m/s . Calculate the centripetal acceleration of the child.Calculate the net horizontal force exerted on the child. (mass = 28.5 kg )
*Tuesday, April 19, 2016 by Brittney*

**Physics **

Use the work-energy theorem to solve each of these problems. You can use Newton's laws to check your answers. Neglect air resistance in all cases.
*Tuesday, April 19, 2016 by Bout*

**Physics**

An electric field measured near a point charge of 3.0 X 10^-6 C has a strength of 1.50 X 10^5 N/C How far is the point from the source charge
*Tuesday, April 19, 2016 by John*

**Physics**

A -6 x10^-6 point charge is .030 m from another point charge and experiences a repulsive fore of 180 N what is the magnitude of the other charge
*Tuesday, April 19, 2016 by Tina*

**Physics**

In the Biomedical and Physical Sciences building at MSU there are 135 steps from the ground floor to the sixth floor. Each step is 16.0 cm tall. It takes 5 minutes and 40 seconds for a person with a mass of 63.9 kg to walk all the way up. How much work did the person do? What ...
*Tuesday, April 19, 2016 by Kevin*

**physics**

A capacitor A1B1 of capacitance C1=2microF is charged under a voltage U1=20V and then isolated. a) Calculate the voltage U (A1B1) between its plates, and it's charge Q1 and energy W1. b) The plates A1 and B1 are connected to those A2 and B2 of an uncharged capacitor of ...
*Tuesday, April 19, 2016 by angy*

**science-college physics**

2. A certain wire of length L, cross-sectional area A is extended by an amount ‘e’ by a force F. Given that the young’s modulus of the material of the wire is E, Show that the; a. Energy stored in the wire is given by the expression (5) b. Energy per unit volume...
*Tuesday, April 19, 2016 by hamunyela morga*

**Physics**

In the Biomedical and Physical Sciences building at MSU there are 135 steps from the ground floor to the sixth floor. Each step is 16.0 cm tall. It takes 5 minutes and 40 seconds for a person with a mass of 63.9 kg to walk all the way up. How much work did the person do? What ...
*Tuesday, April 19, 2016 by Kevin*

**Physics**

An ocean liner leaves New York City and travels 25.1 degrees north of east for 110km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ships displacement vector in the directions, a) due east and b) due north
*Tuesday, April 19, 2016 by Ellie*

**Physics**

one charge of +10 uC is placed at the origin, a second charge of +5uC is placed at (2cm, 4cm) and a third charge (-15 uC) is placed at (4cm, 1 cm). What is the magnitude and direction of the electric force exerted on the first charge by the other two? I drew out the triangle, ...
*Monday, April 18, 2016 by Alec*

**Physics**

If one charge (+5 uC) is placed at origin and a second charge of (+7 uC) at x = 100 cm, then where can a third charge be placed and of what size, so that it has no electrostatic force on it. I know the magnitude of the force will not matter, however, I'm not sure as to how...
*Monday, April 18, 2016 by John*

**Physics**

An object is placed 18m from a screen. At what points between the object and the screen may a lens with focal length of 4m be placed so that an image can form on the screen. I have an exam in a few days, and this is one example my prof never really explained, he just stated. ...
*Monday, April 18, 2016 by William*

**PHYSICS**

When a car engine is turned off, the angular speed of the flywheel decreases linearly with time from 1200 rev/min to zero. a) Find the average angular acceleration b) How many revolutions does the flywheel make before stopping?
*Monday, April 18, 2016 by Hammad*

**Physics**

Calculate the acceleration of a car that is travelling at a constant speed of 100 km per hour on a straight road. The radius R of the Earth is 6370 km. Why do we not feel this acceleration?
*Monday, April 18, 2016 by Hammad*

**science-college physics**

1. A mass of 20 kg is suspended at the end of a rubber cord of diameter 2.0 mm and length 100 cm. Find the period of vertical oscillations of the mass. [Take young’s modulus E, for the rubber = 2.0 x 108 Nm - 2].
*Monday, April 18, 2016 by hamunyela morga*

**physics **

Two bodies a and b masses 4kg and 2kg move towards each other with velocities 3m/s and 2m/s and collide. If the collision is perfectly inelastic, find the velocity of the 2 bodies after collision. Find the tolal kinetic energy of the system before and after collision, hence ...
*Monday, April 18, 2016 by wealth *

**physics**

David Wetterman drops a 5 kg watermelon from the top of a 30 m building. What is the velocity of the watermelon as it smashes into the ground (neglecting air resistance)?
*Sunday, April 17, 2016 by Eli Garrett*

**Physics**

An elevator and its load have a total mass of 800kg .find the tension T in the supporting cable when the elevator originally moving downwards at10m/s is brought to rest with constant acceleretion in distance of25m
*Sunday, April 17, 2016 by Abidemi*

**Physics**

A Ball Of Mass 0.25kg Losses Half Of Its Velocity When It Makes A Head On Collision With An Identical Ball Q At Rest.After The Collision,Q Moves off with a speed of 2m/s in the original direction of p.calculate the initial velocity of p.
*Sunday, April 17, 2016 by Richard*

**Physics**

Brett stats from rest on his skateboard and accelerates at 0.5 m/s2 [N] for 12s, and then maintains his velocity for 15s before falling off his board. He slides along on his back until he comes to rest, accelerating at -2.4 m/s2. a) Calculate the highest instantaneous velocity...
*Sunday, April 17, 2016 by Nancy*

**physics little folks **

a mass is attached at the spring perform SHM with frequency of 15 hz find the acceleration when displacement is 1.6cm
*Sunday, April 17, 2016 by raahim*

**Physics**

A string is 2.4 m long, and the speed of sound along this string is 450 m/s. Calculate the frequency of the wave that would produce a first harmonic. Assume the string has nodes at both ends. What I've Tried Ln=2.4m v= 450 m/s f=? n=2 Ln=(4-1)/4 * Wavelength Wavelength = 2...
*Sunday, April 17, 2016 by AlphaPlus*

**Physics**

Home Economics Math Music Physical Education Science Social Studies GRADE LEVELS Preschool Kindergarten Elementary School 1st Grade 2nd Grade 3rd Grade 4th Grade 5th Grade 6th Grade 7th Grade 8th Grade High School 9th Grade 10th Grade 11th Grade 12th Grade College Adult ...
*Sunday, April 17, 2016 by Rameel*

**Physics**

A brick has mass 10kg and dimensions (10*5*20)cm Find the maximum and minimum pressure it can exert on ground
*Sunday, April 17, 2016 by Clive*

**physics**

The drawing shows a jet engine suspended beneath the wing of an airplane. The weight W with arrow of the engine is 11900 N and acts as shown in the drawing. In flight the engine produces a thrust T with arrow of 64500 N that is parallel to the ground. The rotational axis in ...
*Sunday, April 17, 2016 by nj*

**physics**

a helium nuclide of mass M1 moving with initial velocity V is incident on a stationary of mass M1. After collision M1 was deflected through an angle x and M2 an angle y. If the velocities of the nuclides after collision were V1 and V2 respectively, show that for an elastic ...
*Sunday, April 17, 2016 by Henry*

**Physics**

The volume of a fixed mass of a gas is 200cm cube at 27 degrees celcius.calculate its temperature when the volume is reduced to 1/2 its original at the same temperature
*Sunday, April 17, 2016 by Nimi*

**physics**

before 1900 the activity per mass of atmospheric carbon due to the presence of carbon-14 averaged about 0.255bq/g of carbon 1. what fraction of carbon is carbon-14
*Sunday, April 17, 2016 by jay*

**physics**

before 1900 the activity per mass of atmospheric carbon due to the presence of carbon-14 averaged about 0.255bq/g of carbon 1. what fraction of carbon is carbon-14
*Saturday, April 16, 2016 by jay*

**physics!**

In its search for flying insects, a bat uses an echolocating system based on pulses of high frequency sound. These pulses are 2.0 ms in duration, have a frequency of 50 kHz, and an intensity level of 100 dB at 1.0 m from the bat’s mouth. Assume the bat produces acoustic ...
*Saturday, April 16, 2016 by Jamie*

**physics**

After giving an intense performance, a confused and disoriented flautist has wandered onto the motorway! They are playing a constant 300Hz on their flute and are essentially stationary If you are driving along the motorway at 100 km/h(27.8 m/s). What is the frequency you hear ...
*Saturday, April 16, 2016 by TOM*

**Physics**

PHYSICS HELP PLS!!How does the equation of a displacement v. speed graph (cart moving down an incline through a speed gate) relate to the work-energy principle. Pls answer asap! Thanks!
*Saturday, April 16, 2016 by PLS HELP!!*

**physics 11**

Timmy twirls a dead rat (mass = 2 kg) attached to a rusty chain (length = 1m) in a vertical circle. With what velocity should Timmy rotate the rodent so that the chain just goes slack (no force in the chain) at the top? pls answer :(
*Saturday, April 16, 2016 by Jeremy*

**PHYSICS **

Mars rotates slowly about its axis, the period being 687 days. The mass of mars is 6.39 x 10^23 kg. Determine the radius for a synchronous satellite in orbit around Mars. (assume circular orbit)
*Saturday, April 16, 2016 by Kelly*

**physics HELP PLS :(**

Mark saxby is set to kick the field goal to win the state championship for Olathe East. He is 47.0m away from the goalposts and he kicks the ball at a speed of 25.0m/s at an angle of 30.0 degrees. (a.) If the cross bar on the goalposts is 3.00m above the ground will the ball ...
*Saturday, April 16, 2016 by Debbie*

**Physics**

An elliptical loop of wire has an area of 2m^2.The magnetic field coming out of the page starts from zero and increases according to B(t)=3t^3 Tesla.(a)At what point in time will the voltage measured across 10 ohm resistor is 1 volt.(b)What will be the magnitude and direction ...
*Saturday, April 16, 2016 by Samrah*

**physics**

a body starting from rest attains a speed of 8 m/s in 2 seconds. find the acceleration of the car.
*Saturday, April 16, 2016 by har!@#$%^&a*

**Physics**

Jason approaches a rotary in her 3,500kg Mercedes. Its radius of curvature 95m but his speed is 25m/s. The acceleration is 6.6 m/s^2. What is the coefficient friction between his tires and the road? I know Mu mg=mv^2/R but I am unable to complete my equation and continue to ...
*Friday, April 15, 2016 by Rosie*

**physics**

Trevor skis down a hill at a speed of 25 m/s. Friction slows him down to a speed of 20 m/s. Which free-body diagram shows the forces acting on him
*Friday, April 15, 2016 by diana ramirez*

**Physics**

Eli went for his driving test in an ice storm. He told the registry tester not to worry. He can negotiate an exit ramp at 35 km/hr that has a radius of curvature of 95m. a) What was his speed in meter/second? b)Find required angle for his banked curve to handle an ice filled ...
*Friday, April 15, 2016 by Rosie*

**Physics**

A geostationary satellite orbits the Earth in such a manner that it is always directly above the same point on the equator as the Earth rotates. Assuming that this orbit is circular, what is its radius? (The mass of the Earth is approximately 5.97 × 1024 kg and the ...
*Friday, April 15, 2016 by Joe*

**Physics**

A 30-kg child stands at one end of a floating 20-kg canoe that is 5.0-m long and initially at rest in the water. The child then slowly walks to the other end of the canoe. How far does the canoe move in the water, assuming water friction is negligible?
*Friday, April 15, 2016 by Friendly freeloader*

**Physics**

"Crash" Jackson approaches a rotary in his 3,500 kg Maserati. It's radius of curvature is 95meters but his speed is 25 m/s. What is his acceleration in m/sec/sec and find his coefficient of friction between his tires and the road?
*Friday, April 15, 2016 by Rosie*

**Physics**

A 0.025kg rubber stopper is swung in a horizontal circle by a 0.95 meter threat that makes 25 revolutions every 15 minutes. a) what is the stoppers speed? b) what is the acceleration? c) what is the value of the centripetal force?
*Friday, April 15, 2016 by Rosie*

**Physics**

A car is moving such that its kinetic energy is 6.20×105 J. The car accelerates and the engine does 2.90×105 J of work to accelerate the car. What is the final kinetic energy of the car? Ignore energy lost to friction. (Your answer must be accurate to at least 1%. ...
*Friday, April 15, 2016 by Kevin*

**physics 2**

An Ocean Thermal Energy Conversion (OTEC) power plant built in Hawaii in 1987 was de- signed to operate between the temperature limits of 86 F at the ocean surface and 41 F at a depth of 2100 ft. About 13 300 gallons per minute (gpm) of cold seawater was to be pumped...
*Friday, April 15, 2016 by Ehab*

**PHYSICS PLS HELP ME EVERYONE **

m1 = 1.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 60 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.4 kg that hangs vertically. The system starts from rest with the spring unextended ...
*Friday, April 15, 2016 by Amelia*

**physics**

a bob of mass m of a long pendulum of lengtg Lis at a horizontal position p.when released ,it hits a ball of mass m placed at a position Q.assume the collision to be elastic .after hitting the ball at Q,the bob will attain a height ?
*Thursday, April 14, 2016 by priya*

**physics**

a 45N force is applied to a 9.6 kg object, what is the acceleration.
*Thursday, April 14, 2016 by aly*

**Physics**

An electron traveling at 7.00 x 10^6 m/s enters and passes through a parallel plate capacitor. determine the electric field generated by the capacitor. note that the electron just clears the corner of the positive plate. The distance of the parallel plate capacitor is 2.0 cm ...
*Thursday, April 14, 2016 by Jordan*

**physics**

Two point charges of -86.5 mC and 36.3 mC are held fixed on an x axis at the origin and x = 24.4 cm, respectively. What are the magnitude and direction of the total electrostatic force on a third charge of 18.8 mC placed at (a) x = 48.8 cm (b) x = 97.6 cm I've tried ...
*Thursday, April 14, 2016 by tim*

**PHYSICS!!**

After giving an intense performance, a confused and disoriented flautist has wandered onto the motorway! They are playing a constant 300Hz on their flute and are essentially stationary If you are driving along the motorway at 100 km/h(27.8 m/s). What is the frequency you hear ...
*Thursday, April 14, 2016 by Ben*

**PHYSICS**

During an X-ray examination, a person is exposed to radiation at a rate of 3.17×10-5 grays per second. The exposure time is 0.170 s, and the mass of the exposed tissue is 1.24 kg. Determine the energy absorbed.
*Thursday, April 14, 2016 by Kassia*

**PHYSICS**

A wave with a frequency of 90.0 Hz travels through steel with a wavelength of 3.46 m. What is the speed of this wave?
*Thursday, April 14, 2016 by Caio*

**Physics**

A car starts to move nd accelerated at 4m/s2 for 8 seconds (u=0 V=32m/s a=4 m/s2 t=8) How fast is it moving? How far does it travel in this time?
*Thursday, April 14, 2016 by Zakaria*

**Physics**

A man pulls a crate of mass 61.0 kg across a level floor. He pulls with a force of 186.0 N at an angle of 22.0° above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 120.0 N. If the crate starts from rest, ...
*Thursday, April 14, 2016 by Kevin*

**Physics**

A car (m = 610.0 kg) accelerates uniformly from rest up an inclined road which rises uniformly, to a height, h = 49.0 m. Find the average power the engine must deliver to reach a speed of 24.7 m/s at the top of the hill in 20.5 s(NEGLECT frictional losses: air and rolling, ...)
*Thursday, April 14, 2016 by Kevin*

**Physics**

Organ pipe A, with both ends open, has a fundamental frequency of 225 Hz. The third harmonic of organ pipe B, with one end open, has the same frequency as the second harmonic of pipe A. How long are
*Thursday, April 14, 2016 by HeLp*

**physics**

A charged capacitor (AB) carries on its plate A a charge Q=-1.2mC a) What is the charge carried by plate B. b) Is the voltage U (AB)=V (A)-V (B) positive or negative. c) The plates A and B are connected to the terminals of a resistance R: the capacitor gets discharged. What ...
*Thursday, April 14, 2016 by sandra*

**science-college physics**

Searches Related to 1. A mass of 20 kg is suspended at the end of a rubber cord of diameter 2.0 mm and length 100 cm. Find the period of vertical oscillations of the mass. [Take young’s modulus E, for the rubber = 2.0 x 108 Nm - 2
*Thursday, April 14, 2016 by hamunyela*

**physics**

2 point charges -9nC n 16nC are separated by distance 1m find the position along the line joining the charges on which the resultant electric intensity is zero
*Thursday, April 14, 2016 by supriya*

**Physics**

A car of mass 720 kg travels round a horizontal, semicircular racetrack of radius 200 m, at a constant speed of 48 km/h. What is the sideways component of the force exerted by the track on the car’s tyres?
*Thursday, April 14, 2016 by Aimee*

**PHYSICS**

Point A is 2.0 meters away from a charge of -3.o(Mu) and 3.0 meters away from a charge of +1.5(Mu) as shown. A) Find the net Electric field at point A B) Find the total electric potential at point A Answer This Question
*Thursday, April 14, 2016 by Michael*

**physics**

1- Describe an imaginary process that satisfies the first law but violates the second law of thermodynamics. 2-Describe an imaginary process that satisfies the second law but violates the first law of thermodynamics.
*Thursday, April 14, 2016 by Ehab*

**Physics**

An electron traveling at 7.00 x 10^6 m/s enters and passes through a parallel plate capacitor. determine the electric field generated by the capacitor. note that the electron just clears the corner of the positive plate. PLEASE SHOW ALL WORK!!!
*Wednesday, April 13, 2016 by Collin*

**PHYSICS**

A 75 kg box starts from the top of a ramp at point A. The coeff of fric. between surface & box is 0.275. The avg. normal force of the surface on the box (while it is on the ramp) is 3/4 of its weight. A) What is the velocity of the box right before it hits the spring at point ...
*Wednesday, April 13, 2016 by T.*

**physics**

An engine absorbs 2000J of heat from a hot reservoir and expels 750J to a cold reservoir during each operating cycle. What is the power output of the engine if each cycle lasts for 0.5 seconds?
*Wednesday, April 13, 2016 by Anonymous*

**AP Physics**

Two identical, small balls are suspended by separate 0.25m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.0 x 10^-4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive charges and, as a ...
*Wednesday, April 13, 2016 by Ben*

**AP Physics 1**

Point A is 2.0 meters away from a charge of -3.o(Mu) and 3.0 meters away from a charge of +1.5(Mu) as shown. A) Find the net Electric field at point A B) Find the total electric potential at point A
*Wednesday, April 13, 2016 by Zoella*

**physics**

How much energy is needed to heat and melt 3.0 kg of copper initially at 83°C
*Wednesday, April 13, 2016 by Anonymous*

**physics**

A charged capacitor AB carries on its plate A a charge Q=-1.2mC What is the charge carried by plate B. Is the voltage U(AB)=V(A)-V(B) positive or negative, The plates A and B are connected to the terminals of a resistance R: the capacitor gets discharged. What are the charge ...
*Wednesday, April 13, 2016 by sandra*

**PHYSICS!!**

In its search for flying insects, a bat uses an echolocating system based on pulses of high frequency sound. These pulses are 2.0 ms in duration, have a frequency of 50 kHz, and an intensity level of 100 dB at 1.0 m from the bat’s mouth. Assume the bat produces acoustic ...
*Wednesday, April 13, 2016 by Ben*

**physics**

A capacitor is formed of two identical coaxial disks of diameter 28cm. The distance d between the disks is adjustable . Calculate the capacitance of this capacitor at d=5mm. What becomes the value of this capacitance if a glass sheet 5mm thick is inserted to fill the gap ...
*Wednesday, April 13, 2016 by sandra*

**physics **

A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
*Wednesday, April 13, 2016 by Anonymous*

**Physics Help**

A falling 50-kg skydiver experiences an upward acceleration of 6.2 m/s2 when she opens her parachute. Show (by calculation) how much drag force is produced by the parachute. How would I calculate this?
*Wednesday, April 13, 2016 by Alea*

**Physics**

A block is attached to a spring and set in motion on a horizontal frictionless surface by pulling the block back a distance 10cm from equilibrium. Now, replace the block with one double the mass and set the block into motion again by pulling the block a distance 10cm from ...
*Wednesday, April 13, 2016 by Gloria*

**Physics**

An airtight box has a removable lid of area 1.19E-2 m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 8.67E+4 Pa. The inside of the box is completely evacuated. What is the magnitude of the force required to pull the lid off the...
*Wednesday, April 13, 2016 by Francine*

**physics**

what will be the speed of a 500 kilogram satellite if we apply 100N force on it after each second till 10 hours.the current velocity of this satellite is 16,800 miles per hour?
*Wednesday, April 13, 2016 by pooja*

**physics**

A river flow of width 100 m is flowing with velocity of 1.5 m/s .A man start from one end with rest relative to river .He raws with an acceleration of 2 m/s^2 relative to the river if the man want to cross river in minimum time by how much distance will he be drifted in the ...
*Wednesday, April 13, 2016 by neha*

**Physics**

What is the heat in Joules required to raise the temperature of 25 grams of water from 0 °C to 100 °C? What is the heat in calories? Knowing that 4.18 J = 1 calorie and C= 4.18 J/g·°C M=25g C=4.18 J/g Tf=100 Ti=0 Q=25g x4.18j/g (100-0) Q=25x4.18x(100) Q=104...
*Tuesday, April 12, 2016 by Fabiola*

**AP Physics**

A certain length of wire has a resistance of 21 ohms. This wire is melted down and from the same volume of material a new wire is formed that is three times longer than the original wire. What is the resistance of a new wire? ***PLEASE SHOW ALL WORK!!!
*Tuesday, April 12, 2016 by SARAHM*

**AP Physics**

An electric furnace runs nine hours a day to heat a house in January (31 days). The heating element has a resistance of 10.6 ohms and is hooked up to a 240 Volt potential. What does it cost to run the furnace in the month of January if the cost of electricity is $0.15 per KW*...
*Tuesday, April 12, 2016 by samantha*

**physics**

ABC is a equilateral triangle of side 0.03m. Charges of +5nC and -5nC are placed at the corner A and C find the resultent electric intensity at B.
*Tuesday, April 12, 2016 by Puneeth*

**AP Physics**

Point A is 2.0 meters away from a charge of -3.o(Mu) and 3.0 meters away from a charge of +1.5(Mu) as shown. A) Find the net Electric field at point A B) Find the total electric potential at point A.
*Tuesday, April 12, 2016 by samantha*

**AP Physics**

Two identical, small balls are suspended by separate 0.25m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.0 x 10^-4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive charges and, as a ...
*Tuesday, April 12, 2016 by samantha*

**physics**

a 2.2 kg ball is dropped from 3m above vertical spring whose spring constant is 450 n/m. a) how far will it compress the spring? b.) what velocity will the ball have when it leaves the spring again?
*Tuesday, April 12, 2016 by Anne*

**Physics**

A 5kg box is pulled for a distance of 12m with a force of 20N along frictionless surface. The force is applied at an angle that is 15 deg. above the horizontal. a.) how much work was done by the applied force? b) how fast will the box be moving at the end of the 12m if it ...
*Tuesday, April 12, 2016 by Anne*

**Physics **

A fan is rotating at 50 rad/s. When turned off it slows down to a stop in 90 seconds. How many rev's does the fan make in coming to a stop?
*Tuesday, April 12, 2016 by Wayne *

**physics**

Suppose that 7.40 g of hydrogen is separated into electrons and protons. Suppose also that the protons are placed at the Earth's north pole and the electrons are placed at the south pole. What is the resulting compressional force on the Earth?
*Tuesday, April 12, 2016 by lila*

**physics**

A thin, rigid, uniform rod has a mass of 2.60 kg and a length of 1.69 m. (a) Find the moment of inertia of the rod relative to an axis that is perpendicular to the rod at one end.A thin, rigid, uniform rod has a mass of 2.60 kg and a length of 1.69 m.
*Tuesday, April 12, 2016 by reghuir*

**physics**

One end of a thin rod is attached to a pivot, about which it can rotate without friction. Air resistance is absent. The rod has a length of 0.48 m and is uniform. It is hanging vertically straight downward. The end of the rod nearest the floor is given a linear speed v0, so ...
*Tuesday, April 12, 2016 by reghuir*

**Physics**

If the angle between the polarizer and the analyzer is 30 degrees, what light intensity would be transmitted through the polarizer and analyzer, respectively? I know the equationg we're supposed to use is: I= Io*cos2(theta), but how do I find the Io? And would the answer ...
*Tuesday, April 12, 2016 by Kiara*

**College Physics**

Construct & solve a problem involving a person swimming across a river which has a waterfall some distance downstream. Please help, I have no idea where to start.
*Tuesday, April 12, 2016 by Smi*

**Physics**

A stone is dropped from a tower 100 meters above the ground. The stone falls past ground level and into a well. It hits the water at the bottom of the well 5.00 seconds after being dropped from the tower. Calculate the depth of the well. Given: g = -9.81 meters/second2.
*Tuesday, April 12, 2016 by Stacy*

**physics**

A mass oscillate with SHM of amplitude A and period T y = A cos (2πt/T). The kinetic energy of the mass is equal with twice the potential energy of the spring at :
*Tuesday, April 12, 2016 by JuliePham*

**Physics Help**

A falling 50-kg skydiver experiences an upward acceleration of 6.2 m/s2 when she opens her parachute? Show (by calculation) how much drag force is produced by the parachute? How would I calculate this? F(net) = F(drag) - F(gravity) F(drag) = F(net) + F(gravity) F(drag) = ma + ...
*Tuesday, April 12, 2016 by Alea*

**physics**

An air condenser has an area of 100 cm^2 the plates being 4mm apart. It is connected in series with another condenser having plate area of 20cm^2 plates being separated by dielectric 0.1mm thick with E=2.5. If the potential difference across an condenser is 1000volts; find the...
*Tuesday, April 12, 2016 by vicky*