Monday

September 22, 2014

September 22, 2014

Number of results: 21,586

**Physics**

A sexond smaller metal sphere was positioned near the van de Graff machine. THe sphere was grounded. Did this snaller sphere become charged? How and why? was the interaction between the two spheres attractive or repulsive? Explain. Yes the smaller sphere was charged because ...
*April 2, 2008 by Andrea*

**geometry**

Here is an equation for a sphere: (x-18)^2+(y-5)^2+(z+11)^2=36 give the coordinates of two points on the sphere. I know how to find coordinates on a circle using the equation (x-h)^2+(y-k)^2=r^2 but I can't figure out how t do it with a sphere.
*March 29, 2012 by SoccerStar*

**Algebra**

A sphere has a radius of 4x + 1. Which polynomial in standard form best describes the total surface area of the sphere? Use the formula S = 4(pi)r2 for the surface area of a sphere.
*March 7, 2014 by Sandra*

**Physics**

A merry-go-round in the park has a radius of 1.8 m and a rotational inertia of 900 kgm^2. A child pushes the merry-go-round with a constant force of 80 N applied at the edge and parallel to the edge. A frictional torque of 12 Nm acts at the axle of the merry-go-round. a. What ...
*January 20, 2010 by Bell*

**Physics-help please!**

A net torque of 54 N.m is applied to a disk with a rotational inertia of 13.2 kg.m2 What is the rotational acceleration of the disk?
*July 8, 2014 by Anonymous*

**science**

1. A convex mirror with a focal length of -20cm forms an image 15cm behind the surface. If the object height is 1.2cm what is the image height? 3. A solid glass sphere with a radius of 5cm and index of refraction of 1.52 has a small coin embedded 3cm from the front surface of ...
*July 26, 2011 by Anonymous*

**Physics Please help!**

In each of the following cases, the mass is 7.99 kg and the radius is 7.50 cm. (a) What is the moment of inertia (kg/m2 ) of a solid cylinder rotating about an axis parallel to the symmetry axis but passing through the edge of the cylinder? (b) What is the moment of inertia (...
*March 17, 2012 by john*

**Physics**

A solid rectangular block measure 0.100*0.080m*0.060m and floats freely in a liquid of density 1354kg/m^2 if the depth of liquid 0.04m up the block largest side. Find the density of the block.
*February 26, 2012 by Igbekele*

**physics**

A hollow plastic sphere is held below the surface of a freshwater lake by a cord anchored to the bottom of the lake. The sphere has a volume of 0.600m^3 and the tension in the cord is 840N . What is the mass of the sphere? is this how i would find the mass? (4/3)X3.14X(.600)^3...
*February 15, 2009 by Amanda*

**Physics Rotaional Kinetic Energy**

A car is designed to get its energy from a rotating flywheel with a radius of 1.50 m and a mass of 600 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 4000 rev/min. (a) Find the kinetic energy stored in the ...
*March 17, 2010 by Anonymous*

**Chemistry**

The freezing point of mercury is -38.8C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0C to -38.8C and then frozen to a solid? (The density of liquid ...
*April 22, 2011 by Lindy*

**Chemistry**

The freezing point of mercury is -38.8C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0C to -38.8C and then frozen to a solid? (The density of liquid ...
*April 23, 2011 by Lindy*

**chemistry**

The freezing point of mercury is -38.8C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0C to -38.8C and then frozen to a solid? (The density of liquid ...
*April 23, 2011 by Lindy*

**chemistry**

to find the molarity of an aqueous solution of an ionic solid what do you need to know? a... mass of solid, formula of solid, volume of water b...moles of solid, formula of solid, volume of water c....mass of solid, formula of solid, volume of solution d....moles of solid, ...
*November 30, 2010 by Anna*

**Physic II -----UD**

A metal sphere is insulated electrically and is given a charge. If 50 electrons are added to the sphere in giving a charge, how many Coulombs are added to the sphere?
*January 25, 2014 by Saziye*

**Calculus**

4. At time t, t>0, the volume of a sphere is increasing at a rate proportional to the reciprocal of its radius. At t = 0, the radius of the sphere is 1 and at t = 15 the radius is 2. a. Find the radius of the sphere as a function of t. b. At what time t will the volume of ...
*February 14, 2012 by Anonymous*

**physics, help!!**

A metallic sphere initially has a net charge of +4.0 nC. A negatively-charged rod initially has a net charge of 6.0 nC. When the rod touches the sphere 8.2 x109 electrons are transferred to the sphere. What is the new net charge on the sphere?
*November 9, 2012 by Ella*

**physics**

A 0.67-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.10 to 0.21 m (relative to its unstrained length), the speed of the sphere decreases from 5.35 to 4.55 m/s. What is the spring constant of the spring? (The sphere hangs from the ...
*December 5, 2013 by Donna*

**physics**

A 0.67-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.10 to 0.21 m (relative to its unstrained length), the speed of the sphere decreases from 5.35 to 4.55 m/s. What is the spring constant of the spring? (The sphere hangs from the ...
*December 9, 2013 by Donna*

**Science ASAP please**

1. Which of the following is an example of density? (1 point) ice floating on top of a river convection currents that cause wind oil spill cleanup all of the above 2. What type of property is density? (1 point) chemical property size-independent physical property all of the ...
*April 9, 2013 by Delilah*

**calculus**

Find the volume that remains after a hole of radius 1 is bored through the center of a solid sphere of radius 2.
*December 8, 2011 by Jane*

**math**

what solid shape matches a funnel? Also which shape is the same no matter how you look at it, from any angle or direction? Is this a sphere?
*April 17, 2012 by joei*

**Physics**

A 0.56-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.13 to 0.26 m (relative to its unstrained length), the speed of the sphere decreases from 5.45 to 4.90 m/s. What is the spring constant of the spring? (The sphere hangs from the ...
*November 30, 2012 by Elizabeth*

**Surface Area**

[Given] Fiber Linear Density = 1 denier = 1 g/9000m Fiber Density = 1.14 g/cm^3 [Find..] Fiber surface area in cm^2/g Assume that the fiber strand is a uniform cylinder [Answer] Surface area = 3,150 cm^2/g ....... how do i get to the answer? my professor gives us these notes: ...
*September 14, 2007 by COFFEE*

**physics**

two uniform cylinders have different masses and different rotational inertias.they simultaneously start from rest at top of an inclined plane and rool without sliding down the plane.the cylinder that gets to the bottom first is?
*May 25, 2012 by owen*

**Physics**

The moment of inertia of an object depends on the shape of the object, location and orientation of the axis of rotation. For a solid disk, when the disk is rotating about an axis that is perpendicular to the disk and passing through the center of the disk, the moment of ...
*October 29, 2009 by Ellie*

**Physics. Need urgent help.**

A scuba diver searches for treasure at a depth of 20.0m below the surface of the sea. at what pressure must the scuba device deliver air to the diver? (density of sea water= 1030kg/m^3;atmospheric pressure= 1.013x10^5 pa) another one A king's crown is said to be solid gold but...
*May 6, 2012 by Dan*

**PLEASE HELP!! PHYSICS**

A 0.63-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.13 to 0.22 m (relative to its unstrained length), the speed of the sphere decreases from 5.95 to 4.75 m/s. What is the spring constant of the spring? (The sphere hangs from the ...
*December 1, 2012 by Elizabeth*

**PHYSICS**

Three small spheres are placed at fixed points along the x-axis, whose positive direction points towards the right. Sphere A is at x = 23.0 cm, with a charge of -10.00 microCoulomb Sphere B is at x = 55.0 cm, with a charge of 2.00 microCoulomb Sphere C is at x = 57.0 cm, with ...
*May 4, 2010 by Jay*

**PHYSICS(HELP!!)**

A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and just ...
*October 18, 2013 by Anonymous*

**math**

The radius of a sphere immersed in an infinite ocean of incompressible fluid with density according to the equation, R(t) = A + a cos(nt), where R(t) is a function of time, t, and A, constants, with a being positive. The fluid moves radially under no external forces and ...
*October 12, 2011 by paul gokool*

**science**

A sphere of radius 4 cm iss carved from a homogenous sphere of radius 8cm and mass 160g. the mass of the smaller sphere is
*September 24, 2012 by navneet*

**physics**

A sphere of radius r and mass m has a linear velocity v0 directed to the left and no angular velocity as it is placed on a belt moving to the right with a constant velocity v1. If after sliding on the belt the sphere is to have no linear velocity relatives to the ground as it ...
*March 31, 2010 by pramod*

**Chemistry**

how many radicals are in CuSO4? What occurs to CuSO4 particles in terms of temperature,energy and particles Arrangment as they move from matter to solid? What is the proccess called? (moving from liquid to solid)
*May 14, 2011 by Rose*

**physics**

A negatively charged rod is brought near a neutral sphere supported by an insulating stand. What type of charge would you expect to find on the side of the sphere nearest the rod and on the other side if the sphere is (a) a conductor and (b) an insulator? Explain.
*May 24, 2011 by yuzra*

**physics (PLS HELP)**

A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and just ...
*October 18, 2013 by Anonymous*

**physics help (elena)**

A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and just ...
*October 18, 2013 by Anonymous*

**physics**

Assume a planet is a uniform sphere of radius R that (somehow) has a narrow radial tunnel through its center. Also assume we can position an apple anywhere along the tunnel or outside the sphere. Let FR be the magnitude of the gravitational force on the apple when it is ...
*January 2, 2011 by Kylie*

**physics**

Hurricanes can involve winds in excess of 120 km/h at the outer edge. Make a crude estimate of the energy of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg/m^3) of radius 120 km and height 4.5 km. Make a crude estimate of the ...
*October 25, 2010 by Mark*

**physics**

Hurricanes can involve winds in excess of 120 km/h at the outer edge. Make a crude estimate of the energy of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg/m^3) of radius 120 km and height 4.5 km. Make a crude estimate of the ...
*October 26, 2010 by kim*

**Physics Help!!**

Hurricanes can involve winds in excess of 120 km/h at the outer edge. Make a crude estimate of the energy of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg*m^3 of radius 120 km and height 4.5 km. Make a crude estimate of the ...
*October 26, 2010 by tiffany*

**physics**

Hurricanes can involve winds in excess of 120 km/h at the outer edge. Make a crude estimate of the energy of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg*m^3 of radius 120 km and height 4.5 km. Make a crude estimate of the ...
*October 26, 2010 by Marisol*

**physics**

Hurricanes can involve winds in excess of 120 km/h at the outer edge. Make a crude estimate of the energy of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg*m^3 of radius 120 km and height 4.5 km. Make a crude estimate of the ...
*October 27, 2010 by Mary*

**PHYSICS ---HELP!**

Hurricanes can involve winds in excess of 120 km/h at the outer edge. Make a crude estimate of the energy of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg*m^3 of radius 120 km and height 4.5 km. Make a crude estimate of the ...
*October 27, 2010 by Mary*

**Physics Classical Mechanics**

A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and just ...
*October 21, 2013 by Anonymous*

**physics**

in an experiment using Coulomb's apparatus, a sphere with a charge of 3.6 x 10^-8 C is 1.4 cm from a second sphere of unknown charge. The force between the spheres is 2.7 x 10^-2 N. What is the charge of the second sphere? I get 1.3 x 10^-4 C, but the answer is supposed to be ...
*March 27, 2011 by Sejul*

**Physics**

A solid sphere at rest at the top 12.0 m inclined plane rolls down the incline. How high vertically does it rise of the other incline?
*December 19, 2010 by George*

**PHYSICS**

An irregularly shaped plastic plate with uniform thickness and density (mass per unit volume) is to be rotated around an axle that is perpendicular to the plate face and through point O. The rotational inertia of the plate about that axle is measured with the following method...
*March 24, 2007 by Charlene*

**physics**

A sample of anthracite has a moisture content of 5% when mined and an energy density of 35 kJg-1 when completely dried. Assuming that during combustion, the temperature of the water in the un-dried coal is raised from 20.0oC to 100.oC, and then vaporized at 100.oC, estimate ...
*March 10, 2010 by k*

**physics**

Initially, both metal spheres are neutral. In a charging process, 1 1013 electrons are removed from one metal sphere and placed on a second sphere. Then the electrical poten- tial energy associated with the two spheres is found to be −0.061 J . The Coulomb constant is ...
*February 16, 2010 by Tj*

**physics**

2.A solid iron cylinder with a diameter of 150mm a height of 1m and a density of 7860 kg/m^3 is suspended in fresh water (density of fresh water is 1000 kg/m^3) calculate the tension in the supporting cable when two thirds of the volume of the cylinder is submerged
*January 19, 2014 by moody*

**Physics**

A uniform solid disk of radius 1.7 m and mass 81.3 kg is free to rotate on a frictionless pivot through a point on its rim. If the disk is released from rest in the position shown by the solid circle, what is the speed of its center of mass when the disk reaches the position ...
*March 19, 2011 by Jennifer*

**Physics**

In a Milliken type experiment, two horizontal parallel plates are 1.0 cm apart. A sphere of mass 2.2 x 10^(-13) kg remains stationary when the potential difference between the plates is 350V with the upper plate is negative. How much excess or deficit of electrons does the ...
*July 23, 2012 by KnowsNothing*

**math**

any shape with 4 lines of symmetry and rotational order 2. A rectangle would fit that description. See http://www.icteachers.co.uk/children/sats/rotational.htm#Maths I hope this helps. Thanks for asking. i need some help on my maths and i am inbarresed to ask my teacher
*September 17, 2006 by george*

**Physics Please help!**

In each of the following cases, the mass is 7.99 kg and the radius is 7.50 cm. (a) What is the moment of inertia (kg/m2 ) of a solid cylinder rotating about an axis parallel to the symmetry axis but passing through the edge of the cylinder? (b) What is the moment of inertia (...
*March 18, 2012 by john*

**Physics**

A small steel sphere of mass 0.40 kg is attached by a 0.50 m long cord to a swivel pin set into the surface of a frictionless table top. The sphere moves in a circle on the horizontal surface with a speed of 6.0 m/s. a.) what is the magnitude of the centripetal acceleration of...
*April 12, 2013 by Alex*

**MAth**

A sphere has a surface area of 28.26 in2. Find the diameter in inches, of the sphere. Use PI Question 2 What is the surface area, in square inches, of a sphere with radius 3.5 in.? Use Pi and round your answer to the nearest hundredth, if necessary. Question 3 Whats is the ...
*July 8, 2012 by Jessica*

**Phy 231**

an 18-wheeler travels down the highway with a speed of 50 km/hr. each wheel has a 30 cm radius and a mass of 16 kg. what is the total kinetic(translational and rotational) energy of all 18 wheels?
*July 31, 2012 by Sally*

**Chemistry**

1.The density of solid Fe is 7.87 g/cm3. What volume per atom of Fe? 2.As a solid Fe adopts a body centered cubic unit cell. What is the volume of a unit cell of this metal? 3.What is the edge length of a unit cell of Fe?
*July 9, 2011 by Josh *

**PHYSICS**

Estimate the terminal speed of a wooden sphere (density 0.700 g/cm3) falling through air if its radius is 3.20 cm and its drag coefficient is 0.470.
*September 24, 2009 by Luke*

**physic**

ten dipoles, each consisting of two charges +- 19 uC, are located within a spherical surface, the radius of which is 2 mm. What is the flux density through the sphere i got 4.1*10^6 N-m^2/C ???????????
*February 5, 2014 by buline*

**physics**

What net torque is required to give a uniform 12-kg solid ball with a radius of 0.22m an angular acceleration of 12rad/s2 ?
*November 14, 2013 by help!*

**Physics**

Sphere 1 has surface area A1 and volume V1, and sphere 2 has surface area A2 and volume V2. If the radius of sphere 2 is 3.5 times the radius of sphere 1, what is the ratio of each of the following?
*August 30, 2011 by Anonymous*

**Physics**

Two conducting spheres are connected by a thin wire and are in electrostatic equilibrium. The diameter of the smaller sphere is 3.0 cm and the diameter of the larger one is 8.0 cm. If the smaller sphere is found to be charged to 2.0 nC, what is the charge of the larger sphere?
*February 10, 2011 by Mr. Science*

**Physics-mechanics**

Two spheres are placed so that their centers are 2.6m apart. the force bvetween the two spheres is 2.75 x 10 to the power of negative 12 Newton.What is the mass of each sphere if one sphere is twice the mass of the other sphere?
*December 24, 2012 by Rebecca*

**physics**

Two spheres are placed so that their centers are 2.6 meters apart. The force between the two spheres is 2.75x10^-12N What is the mass of each sphere if one sphere is twice the mass of the other sphere?
*May 27, 2009 by chelsea*

**CHEM**

You are a researcher for a golf club manufacturer. You are given two identical looking cubes of a metal alloy. You are informed that they are made of the exact same material, but one is a crystalline, while the other is amorphous. It is your job to determine which one is ...
*November 28, 2007 by K*

**Physics**

Two spheres are launched horizontally from a 1.0 -high table. Sphere is launched with an initial speed of 4.5 . Sphere is launched with an initial speed of 3.0 . What is the time for the sphere A to hit the floor? What is the time for the sphere B to hit the floor? What is the...
*October 13, 2012 by anonymous*

**Columbia College**

A metal sphere is insulated electrically and is given a charge. If 50 electrons are added to the sphere in giving a charge, how many Coulombs are added to the sphere? Please show step by step...s
*January 25, 2014 by Hamide*

**calculus**

A 20.0 g copper ring at 0.000C has an inner diameter of D = 2.54000 cm. An aluminum sphere at 108.0C has a diameter of d = 2.54508 cm. The sphere is placed on top of the ring, and the two are allowed to come to thermal equilibrium, with no heat lost to the surroundings. The ...
*September 1, 2010 by stan*

**Chemistry**

Obtain the radius of a sphere of zinc if its mass is 0.23 mg. The density of zinc is 7.14 g/mL. The given formulas are: d=m/v v=(4/3)pi r^3
*November 3, 2011 by Jacob*

**geometry**

A plane intersects a sphere that has a radius of 13 cm. The distance from the center of the sphere to the closest point on the plane is 5 cm. What is the radius of the circle that is the intersection of the sphere and the plane? A. 8 cm B. 10 cm C. 12 cm D. 13 cm
*May 6, 2012 by Anonymous*

**Chemistry**

How do you calculate the density of a rectangular solid, which has a mass of 25.71
*September 12, 2012 by Trina*

**physics**

Two spheres are placed so that their centers are 2.9 m apart. The force between the two spheres is 2.60 multiplied by 10-12 N. What is the mass of each sphere if one sphere is twice the mass of the other sphere?
*December 11, 2010 by DESPERATE*

**physics**

How does the radiant energy from an incandescent solid differ from the radiant energy emitted by an excited gas?
*May 8, 2013 by Emilie*

**Physics**

A king's crown is said to be solid gold but may be made of lead and covered with gold. when it is weighed in air, the scale reads 0.475 kg. when it is submerged in water the scale reads 0.437 kg.is it solid gold? if not, what percent is mass is gold? (density of gold= 19.3x10^...
*May 6, 2012 by Sarah*

**physics**

Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and E = 1.157 x 10-5 rev/sec.
*December 4, 2010 by Qay*

**physics**

Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and We = 1.157 x 10-5 rev/sec.
*December 4, 2010 by qay*

**physics homework! #92**

A small sphere is hung by a string from the ceiling of a van. When the van is stationary, the sphere hangs vertically. However, when the van accelerates, the sphere swings backward so that the string makes an angle of with respect to the vertical. Find the acceleration of ...
*February 7, 2011 by Tiffany*

**solid geometry**

what are the dimensions of a gallon can of uniform square cross section whose height is twice the length of an edge of its base?
*January 10, 2012 by jen*

**Physics**

A car with a total mass of 1.48 103 kg has wheels of radius 33.5 cm and moment of inertia 0.810 kg m2. (a) Find the car's translational kinetic energy when the car is moving at a speed of 30.0 m/s. (b) Find the car's rotational energy when the car is moving at a speed of 30....
*December 10, 2013 by BrandiB123456789*

**Physics**

A pendulum consists of a sphere of mass 1.5 kg attached to a light cord of length 10.9 m as in the ﬁgure below. The sphere is released from rest when the cord makes a 58 degree angle with the vertical, and the pivot at P is frictionless. The acceleration of gravity is 9...
*January 10, 2012 by Amanda and Leah*

**science**

The lanthanide metal europium (Eu) forms a crystalline solid with a cubic unit cell of edge length 3.854 . The density of europium is 4.408 g cm-3. The crystal structure of solid europium is a. body-centered cubic b. simple cubic c. face-centered cubic
*October 4, 2011 by ice cream*

**Physics**

An infinitely long line of charge has linear charge density . Find the energy density of the electric field at a point a radial distance r from the wire. (Use the following as necessary: 0, , r.)
*August 31, 2013 by Lily*

**science**

what is the si base unit for density, liquid, and rectangular solid?
*August 12, 2009 by bobbie*

**chemistry**

what is the density of a solid object with a mass of 1.65 lb and a volume of 170ml?
*September 10, 2010 by sam*

**chemistry**

what is the density of solid that has a mass of 250.g and a volume of 200.ml
*October 12, 2011 by Anonymous*

**physics**

Find the density of a 4.2- kg solid cylinder that is 13 cm tall with a radius of 5.0 cm.
*March 22, 2012 by jim*

**physics**

Find the density of a 4.2- kg solid cylinder that is 13 cm tall with a radius of 5.0 cm.
*March 24, 2012 by jim*

**Physics**

Find the density of a 5.8- solid cylinder that is 15 cm tall with a radius of 5.0 .
*April 3, 2013 by Ericca*

**physics**

A car is designed to get its energy from a rotating flywheel with a radius of 1.50 m and a mass of 600 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 4000 rev/min. (a) Find the kinetic energy stored in the ...
*March 17, 2010 by mike*

**Chemistry**

As a substance goes from a solid to a liquid, the particles move further apart? duh For many substances, yes. It depends on the density of the solid/liquid. What does happen, is that in solids atoms are mostly bound in a crystal arrangement, and not free to move except in a ...
*May 29, 2007 by Katie*

**physics**

What is the angular velocity of the object shown below if it rotates about the point P in the center? The rotational kinetic energy of the object is 1.4 J, the mass M is 1.3 kg, and L is 0.50 m.
*June 10, 2014 by jessica*

**Chemistry**

Suppose a compound could point in any of two directions in the solid and still have the same energy. How many molecules would there be if the total entropy of a solid sample of this compound was 8.174e-9J/K I used S= klnW and got lnW = 5.92e14. How do i get the number of ...
*April 30, 2011 by Jude*

**Physics**

A shipwrecked mariner is stranded on a desert island. He seals a plea for rescue in a 1.00 liter bottle, corks it up, and throws it into the sea. If the mass of the bottle, plus the message and the air inside, is 0.454 kg, what percentage of the volume of the bottle is ...
*June 17, 2012 by Jamie*

**Spheres, Locus (in space aka 3d)**

1) A "small circle" is a circle on a sphere that is NOT a "great circle". What is the locus of the centers of ALL small circles of a sphere having radius 1/2 that of the sphere? I think the answer is a plane? But I'm not sure. Please help me!
*May 14, 2012 by Billy*

**Science**

the density of liquid mercury is 13.53 g/cm3.The density of a solid copper is 8.96 g cm3. would you expect a piece of copper to sink or float when placed in a container of liquid mercury?
*September 16, 2014 by Brianna*

**calculus**

Find Mx, My, and (x, y) for the laminas of uniform density ρ bounded by the graphs of the equations. (Use rho for ρ as necessary.) y =1/5 y = 0 x = 4
*January 26, 2012 by Rox*

**Physics**

Styrofoam has a density of 300kg/m3. What is the maximum mass that can hang without sinking from a 30.0cm -diameter Styrofoam sphere in water?
*September 16, 2013 by Anonymous*

**Physics, asap please**

If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...
*December 10, 2012 by Katie*

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