Friday

June 24, 2016
**Physics**

A baseball is hit and leaves the bat horizontally at a speed of 6.7 m/s. The ball lands 10.3 m from where it was hit. What was the height of the bat at the time it hit the baseball, in m?
*Monday, April 11, 2016 by Bira*

**Physics**

A volleyball is sent over a net, having been launched at a speed 5 m/s at an angle 42.7 degrees above the horizontal, from the ground. What is the ball’s speed, in m/s, 2.97 seconds after being launched?
*Monday, April 11, 2016 by Bira*

**Physics**

An egg is thrown from the top edge of a 22.9 m high building down onto an unsuspecting person standing on the ground 6.2 m from the base of the building. If the egg is tossed horizontally, at what speed, in m/s, must the egg be thrown such that it lands on the person?
*Monday, April 11, 2016 by Bira*

**Physics**

A 1.4 kg box that is sliding on a frictionless surface with a speed of 10 m/s approaches a horizontal spring. The spring has a spring constant of 2000 N/m. (a) How far will the spring be compressed in stopping the box? (b) How far will the spring be compressed when the box'...
*Sunday, April 10, 2016 by michael*

**Physics**

A 1100 kg safe is 2.0 m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses it 40 cm. What is the spring constant of the spring? I don't understand what to do here
*Sunday, April 10, 2016 by tom*

**Physics**

A flying squid (family Ommastrephidae) is able to "jump" off the surface of the sea by taking water into its body cavity and then ejecting the water vertically downward. A 0.80 kg squid is able to eject 0.32 kg of water with a speed of 20 m/s. (a) What will be the ...
*Sunday, April 10, 2016 by xxxxxxx*

**Physics**

A proton, moving with a velocity of vii, collides elastically with another proton that is initially at rest. Assuming that after the collision the speed of the initially moving proton is 1.50 times the speed of the proton initially at rest, find the following.
*Sunday, April 10, 2016 by Dance Queen *

**physics**

A window air conditioner consumes 900 W of electric power and has COP = 2.9.If it runs continuously for 24 h , how much heat gets removed from the house?
*Sunday, April 10, 2016 by lizbeth*

**Physics**

A 3.10 kg block is pushed along a floor by a constant applied force that is horizontal and has a magnitude of 43.5 N. What is the coefficient of kinetic friction between the block and the floor? I tried dividing the N by the KG and vise versa but it didn't work
*Sunday, April 10, 2016 by xxxxxxx*

**Physics**

An ideal spring hangs vertically from the ceiling. When a 1.0 kg mass hangs from the spring it is extended 5.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10 cm. While the spring is being extended by the ...
*Sunday, April 10, 2016 by Joane *

**physics**

Consider the circuit shown below. Assume that the op-amp is ideal. fa2014_fn_diode_opamp2.png Figure 3-1 The diode has the following I-V characteristics: iD=Is*(e^(vD/vth)-1) where iD is the current through the diode,( Is ) is the reverse bias saturation current Vd is the ...
*Sunday, April 10, 2016 by bearinthewoods*

**Physics**

Einswine has a mass of 300 kg. He sits on an ideal spring. Before he sits on the spring it is 2 m tall. After he sits on the spring it is only 1.5 m tall. What is the spring constant of the spring?
*Sunday, April 10, 2016 by joane *

**physics**

A light spring of constant k = 95.0 N/m is attached vertically to a table (figure (a)). A 2.70-g balloon is filled with helium (density = 0.179 kg/m3) to a volume of 4.00 m3 and is then connected to the spring, causing the spring to stretch as shown in figure (b). Determine ...
*Sunday, April 10, 2016 by anna*

**physics**

given the following apparatus; retort stand,stone,thread,spring balance,water,beaker and kerosine.using Archimede's principle, describe a simple experiment on how to determine the density of kerosine.
*Sunday, April 10, 2016 by kelechi*

**physics**

A 1.00-kg beaker containing 2.29 kg of oil (density = 916 kg/m3) rests on a scale. A 2.33-kg block of iron is suspended from a spring scale and is completely submerged in the oil (see figure below). Find the equilibrium readings of both scales. top scale N bottom scale N
*Sunday, April 10, 2016 by anna*

**physics**

Piston circled 1 in the figure below has a diameter of 0.28 in.; Piston circled 2 has a diameter of 1.6 in. In the absence of friction, determine the force vector F necessary to support the 500-lb weight. in lb i got 1.53 lb but it is incorrect
*Sunday, April 10, 2016 by anna*

**College Physics 1 (Algebra-based)**

Calculate the force required of the "deltoid" muscle, Fm, to hold up the outstretched arm shown in the figure below. The total mass of the arm is 3.31kg. Assume that alpha = 15.2°, d = 12.0 cm and D = 24.0 cm. Figure: tinyurl com/hszqaqw Any help (at least how to...
*Sunday, April 10, 2016 by collegegirl*

**PHYSICS!!**

Two basketball players collide head on. play a weighs 80 kg and is travelling 2.5m/s to the right while player b weighs 68 kg and is travelling 1.2 m/s to the left. after collision player a is travelling at 1.0 m/s to the right. a. what is the change in momentum of player a? b...
*Sunday, April 10, 2016 by tom*

**Physics CENTER OF MASS**

A thin rectangular plate of uniform areal density σ = 2.79 kg/m2 has length of 37.0 cm and width of 23.0 cm. The lower left hand corner is located at the origin, (x,y)= (0,0) and the length is along the x-axis. (a)There is a circular hole of radius 8.00 cm with center at...
*Sunday, April 10, 2016 by Jesse*

**HELP PHYSICS!! WORK**

How much work is it to push a box (mass 190 kg) up an incline (angle 16 degrees with the horizontal) that is 8.3 meters long, if the coefficient of kinetic friction between the box and the incline is 0.6?
*Sunday, April 10, 2016 by Emma*

**PHYSICS work on a ramp!!!**

How much work is it to push a box (mass 190 kg) up an incline (angle 16 degrees with the horizontal) that is 8.3 meters long, if the coefficient of kinetic friction between the box and the incline is 0.6? My doubt is how do I find force?
*Sunday, April 10, 2016 by Matt*

**Energy of satellite PHYSICS**

An m = 43 kg mass instrument package is put into orbit at an altitude above the Earth of A = 23000 km. What is the kinetic energy of this satellite in Joules?
*Sunday, April 10, 2016 by Stephanie*

**PHYSICS CENTER OF MASS**

A thin rectangular plate of uniform areal density σ = 2.79 kg/m2 has length of 37.0 cm and width of 23.0 cm. The lower left hand corner is located at the origin, (x,y)= (0,0) and the length is along the x-axis. (a)There is a circular hole of radius 8.00 cm with center at...
*Sunday, April 10, 2016 by Nancy*

**Physics projectile**

If a body projected vertically upwards, give a graph showing variation in its kinetic energy
*Sunday, April 10, 2016 by Anonymous*

**Quick Physics help**

1. What is the medium for waves on a rope? 2. What is the medium for earthquake waves? 3. A characteristic of waves is that after the wave has passed the medium is (disturbed, undisturbed) is this disturbed? 4. A cork is floating in the water 20 m from the shore of a lake. No ...
*Sunday, April 10, 2016 by Anonymous *

**Physics**

A ball is thrown from the ground toward a cliff of height h with a speed of 30.0 m/s and an angle of 60o above horizontal. It lands on the cliff 4.00 s later. How high is the cliff? Answer: 25.5 m But having difficulty getting this answer
*Sunday, April 10, 2016 by Sarah*

**Physics **

The amount of radiant power produced by the sun is approximately 3.9 x 1026 W. Assuming the sun to be a perfect blackbody (e = 1) sphere with a radius of 6.96 x 108 m, find its surface temperature (in kelvins).
*Sunday, April 10, 2016 by Akeneta *

**PHYSICS ENERGY CONSERVATION!!**

The car shown in the figure has a mass of 395 kg when it passes through point A with a speed of 17.7 m/s, being the height of A 7.2 m above the ground (y = 0). In the instant that passes through C its speed is diminished to 7.6 m/s. Assuming that the path has no friction (a) ...
*Sunday, April 10, 2016 by Malcolm*

**Physics**

You take a trip in your car. Starting from rest, you accelerate at 1.00 m/s2 for 10.0 s, heading north. You then stop accelerating and immediately head west at a constant speed for an additional 20.0 s, at which point, you crash into a building coming to an instant stop. At ...
*Sunday, April 10, 2016 by sarah*

**Physics**

A 25 kg box is along a horizontal floor and a force of 400 N pushes the box with an angle of 50 degree with the horizontal. Starting from rest, the box achieves a velocity of 2 m/s in a time of 4 seconds. Find the coefficient of sliding friction between the box and the floor. ...
*Sunday, April 10, 2016 by Shekinah*

**physics**

A mass m = 0.068 kg of benzene vapor (Lv = 3.94x105 J/kg) at its boiling point of 80.1°C is to be condensed by mixing with water at 45.0°C. What is the minimum mass of water required to condense all of the benzene vapor? Assume the mixing and condensation take place is...
*Sunday, April 10, 2016 by jose*

**physics**

A golf ball is hit at a velocity of 30 m/s at an angle of 40˚ from the ground. a.) How high will the golf ball rise? b.) How long will it take for it to hit the ground? c.) How far will it go?
*Sunday, April 10, 2016 by suzie*

**physics**

A ball is thrown horizontally from a height of 100 m. It covered a horizontal distance of 3,350 m when it touches the ground. a. What is its horizontal velocity? b. How many seconds after it was fired will it touch the ground? c. What was its vertical velocity when it hits the...
*Sunday, April 10, 2016 by suzie*

**physics**

A bullet with a muzzle velocity of 200 m/s is fired horizontally from a rifle mounted on top of a window ledge 7.8 m from the ground. a.) How long will it take to hit the ground? b.) What is the range of the bullet?
*Sunday, April 10, 2016 by suzie*

**physics**

Two electrically-charges spheres are suspended from insulated threads a certain distance from each other. There is a certain amount of electrostatic force between them. Describe specifically (not just increase or decrease) what happens to this force in each of the scenarios ...
*Saturday, April 9, 2016 by taylor*

**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
*Saturday, April 9, 2016 by PLS HELP!!*

**Physics**

Please how do i get an answer to this answer that goes like this a wire of length 5.0m and diameter 2.0cm extends by 0.25mm when a force of 50n was used on its end. Calculate (i) stress (ii) strain in the wire (pi=3.142)
*Saturday, April 9, 2016 by Manuel*

**Physics**

A bicycle is turned upside down while its owner repairs a flat tire. A friend spins the other wheel and observes that drops of water fly off tangentially. She measures the heights reached by drops moving vertically (see figure below). A drop that breaks loose from the tire on ...
*Saturday, April 9, 2016 by A.G.*

**Physics**

Q1. What is the working principle of the loudspeaker. Q2.Explain the following:- 1.Beat 2.Shock wave 3.Mach effect.
*Saturday, April 9, 2016 by Jamilu.*

**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?
*Saturday, April 9, 2016 by lizbeth*

**Physics**

the current in an rc circuit if the resistance is 20 ohms the capacitance is 0.002 farad the emr is 12e^-10t
*Saturday, April 9, 2016 by fatimaaa*

**physics**

A 58 kg skier has a speed of 9.5 m/s at point A. She then encounters a 1.75 m deep dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m.
*Saturday, April 9, 2016 by rocky*

**physics**

The lightbulb in the circuit shown in the figure has a resistance of 14 Ω and consumes 4.2 W of power; the rod is 1.18 m long and moves to the left with a constant speed of 2.9 m/s . The strength of the magnetic field is 2.2 T . Find the current that flows in the circuit...
*Friday, April 8, 2016 by jacob*

**Physics**

The isotope, Carbon-14 emits beta radiation and has a half live of 5730 years. How long will it take for the amount of radiation this gives off to drop by a factor of 4?
*Friday, April 8, 2016 by Alea*

**Physics**

The total U.S. consumption of electricity in a particular year was 5.0 x 10^12 kilowatt-hours. What is the mass equivalence of this amount of energy? Show all calculations leading to an answer. How would I solve it?
*Friday, April 8, 2016 by Alea*

**physics- help me please **

The pressure at the bottom of a glass filled with water (ρ = 1000 kg/m3) is P. The water is poured out and the glass is filled with mercury (ρ = 13.6 ✕ 103 kg/m3). The pressure at the bottom of the glass is now which of the following? a)equal to P b)smaller ...
*Friday, April 8, 2016 by anna*

**physics- help me please**

Suppose you have two cubic meters of uranium, four cubic meters of lead, four cubic meters of copper. Rank them by mass, from smallest to largest. a)lead, copper, uranium b)uranium, copper, lead c)copper, uranium, lead d)uranium, lead, copper can someone help me
*Friday, April 8, 2016 by anna*

**physics**

What is the maximum walking speed of an adult man whose legs are each 1.2 m long?
*Friday, April 8, 2016 by aram*

**Physics **

An object is thrown directly up (positive direction) with a velocity (vo) of 20.0 m/s and do= 0. How high does it rise (v = 0 cm/s at top of rise). Remember, acceleration is -9.80 m/s2.
*Friday, April 8, 2016 by emanuel*

**physics**

Find dy/dx when y=e^nx
*Friday, April 8, 2016 by pankaj*

**Physics**

You throw a baseball at a 45∘ angle to the horizontal, aiming at a friend who's sitting in a tree a distance h above level ground. At the instant you throw your ball, your friend drops another ball. The two balls will collide, no matter what your ball's initial ...
*Friday, April 8, 2016 by Megan*

**Physics**

An arrow fired horizontally at 45 m/s travels 26 m horizontally. From what height was it fired?
*Friday, April 8, 2016 by Megan*

**Physics**

A flock of geese is attempting to migrate due south, but the wind is blowing from the west at 5.4 m/s . If the birds can fly at 7.9 m/s relative to the air, what direction should they head?
*Friday, April 8, 2016 by Megan*

**Physics**

The position of an object as a function of time is r⃗ =(3.2t+ 1.8 t2)i^+(1.7t− 2.4 t2)j^m, where t is the time in seconds. Find the object’s magnitude of the acceleration. What is the direction of the acceleration?
*Friday, April 8, 2016 by Megan*

**Physics**

An ice skater is gliding along at 2.1 m/s , when she undergoes an acceleration of magnitude 1.4 m/s2 for 3.0 s. After that she's moving at 6.3 m/s . Find the angle between her acceleration vector and her initial velocity vector.
*Friday, April 8, 2016 by Megan*

**Physics**

You're an investigator for the National Transportation Safety Board, examining a subway accident in which a train going at 88 km/h collided with a slower train traveling in the same direction at 22 km/h . Your job is to determine the relative speed of the collision, to ...
*Friday, April 8, 2016 by Megan*

**physics **

A particular wire, fixed at both ends, "resonates" in 2 "loops" and has a frequency of 102 Hz. What is the fundamental frequency?
*Friday, April 8, 2016 by Jac*

**physics **

The length of the B string on a certain guitar is 60.0 cm. It vibrates at a fundamental frequency of 246.0 Hz. What is the speed of the transverse waves on the string?
*Friday, April 8, 2016 by Jac*

**physics **

Periodic waves spread out over the surface of a lake where two women, Jenny and Melissa, are fishing in separate boats 65 meters apart. Each woman's boat bobs up and down 19/min. At a time when Jenny's boat is at a crest, Melissa's boat is at its lowest point, and ...
*Friday, April 8, 2016 by Jay*

**Physics**

You can run 8.0 m/s , 20% faster than your brother. How much head start should you give him in order to have a tie race over 90 m ?
*Friday, April 8, 2016 by Megan*

**Physics**

You allow yourself 34 min to drive 26 mi to the airport, but you're caught in heavy traffic and average only 15 mi/h for the first 13 min . What must your average speed be on the rest of the trip if you're to make your flight?
*Friday, April 8, 2016 by Megan*

**Physics**

A rock is thrown directly upward from the edge of the roof of a building that is 40.2 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Neglect any effects of air resistance. With what speed was the...
*Friday, April 8, 2016 by Megan*

**physics **

Two tuning forks are sounded together. One has a frequency of 741 Hz and the other a frequency of 715 Hz. Calculate the beat frequency that would be produced.
*Friday, April 8, 2016 by Jay*

**physics **

A 3580 Hz tuning fork is sounded at the same time that a note on a piano is struck. You hear 8 beats/s. You loosen the string slightly and now hear 12 beats/s. What is the frequency of the vibrating piano string now after the loosen ing?
*Friday, April 8, 2016 by Jay*

**Physics**

In a chase scene, a movie stuntman runs horizontally off the flat roof of one building and lands on another roof 2.0 m lower. If the gap between the buildings is 4.8 m wide, how fast must he run to cross the gap?
*Friday, April 8, 2016 by Megan*

**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*