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July 31, 2014

Search: the volume of a sphere of radius r is V = 4/3 pi r^3. Use the formula to find r in terms of V. Rationalize the denominator. Use your answer to part (a) to find the radius of a sphere with volume 100 cubic inches

Number of results: 18,442

calculus
3. The radius r of a sphere is increasing at a constant rate of 0.04 centimeters per second. (Note: The volume of a sphere with radius r is v=4/3pir^3 ). a. At the time when the radius of the sphere is 10 cm, what is the rate of increase of its volume? b. At the time when the ...
January 3, 2012 by Yoona

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

college physics
Two solid spheres A and B are made from the same material. The mass of sphere B is eight times that of sphere A. If the radius of sphere A is 7.50 cm, what is the radius of sphere B? [Volume of a sphere of radius r is given by V = 4r63/3]
January 19, 2010 by Mandy

college physics
Two solid spheres A and B are made from the same material. The mass of sphere B is eight times that of sphere A. If the radius of sphere A is 7.50 cm, what is the radius of sphere B? [Volume of a sphere of radius r is given by V = 4r63/3]
January 19, 2010 by Mandy

physics
Two solid spheres A and B are made from the same material. The mass of sphere B is eight times that of sphere A. If the radius of sphere A is 7.50 cm, what is the radius of sphere B? [Volume of a sphere of radius r is given by V = 4r63/3]
January 19, 2010 by Mandy

calculus *improper integrals*
A hole of a radius of 1cm is pierced in a sphere of a 4cm radius. Calculate the volume of the remaining sphere. I know that the volume of a sphere with an exterior radius is of: V = pie(R^2 - r^2) dH where R^2 is the exterior surface area and r^2 is the interior surface area. ...
September 16, 2012 by John

10th grade
The volume of a small sphere is 36 pie cm cubed. The volume of a large sphere is 288 cm cubed and its radius is 6 cm. What is the similarity ratio of the radii of the two spheres? What is the measurement of the small sphere's radius?
February 23, 2010 by renee

math
The side length, d, of a cube that contains a sphere depends on the radius, r, of a sphere. Assuming that the faces of the cube are tangent to the sphere, write the volume of the cube as a function of the radius of the sphere.
January 24, 2014 by john

algebra
what is the volume of a sphere with radius r is given by the formula v=4/3 r^3 Find the volume of sphere with radius 4 meters. use 3.14 for the value of x and round your answer to the nearest tenth.
November 16, 2011 by Angela

Chemistry
The volume of a sphere is given by V=(4/3)3.14r^3, where r is the radius. Compute the volume of a sphere with a radius of 329pm. state your answer in units of m^3.
January 29, 2014 by Cain

Physics
What is the volume in cubic cm of a sphere with radius 2 cm? is it = 33.51032163829112 What is the area in m2 of a triangle with base 2.8 m and height of 10.4 m? is it = 14.56 A sphere has a volume of 106 cm3. What is its radius (in cm)? is it = 101.8112097952136 that doesnt ...
August 24, 2009 by Yulia

Math
The radius needed to create a sphere with a given volume V can be approximated by the equation r = 0.6(V)^1/3. Find the radius of a sphere with a volume of 729 cubic meters. Round the answer to the nearest hundredth.
March 27, 2010 by Anonymous

algebra
The radius needed to create a sphere with a given volume V can be approximated by the equation r = 0.62(V)1/3. Find the radius of a sphere with a volume of 216 cubic meters. Round the answer to the nearest hundredth.
July 7, 2013 by Anonymous

calculus
A hole of a radius of 1cm is pierced in a sphere of a 4cm radius. Calculate the volume of the remaining sphere. I know that the volume of a sphere with an exterior radius is of: V = pie(R^2 - r^2) dH where R^2 is the exterior surface area and r^2 is the interior surface area. ...
September 15, 2012 by John

physics
How do i put them all in sig fig form??? What is the volume in cubic cm of a sphere with radius 2 cm? is it = 33.51032163829112 What is the area in m2 of a triangle with base 2.8 m and height of 10.4 m? is it = 14.56 A sphere has a volume of 106 cm3. What is its radius (in cm...
August 25, 2009 by Yulia

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

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

physics
A solid nonconducting sphere of radius 13 cm has a positive charge 9.8 10-8 C spread uniformly throughout its volume. The electric field at a point within the sphere at a radius 5.0 cm has a magnitude of
January 15, 2013 by adam h.

Pre-Calculus
As a balloon in the shape of a sphere is being blown up, the radius is increasing 1/pi inches per second. At what rate is the volume increasing when the radius is 1 inch? I know that the volume of a sphere = 4/3(pi)r^3 I don't know what to do next. Figure dV/dt dV/dr *dr/dt= ...
May 30, 2007 by Corin

MATH
A sphere has five times the volume of a right cone that has a radius of 4.6 cm and a height of 7.7 cm. Determine the radius of the sphere to the tenth of a centimetre. This question is multiple choice and these were the options: A. 2.2cm B. 3.4cm C. 5.9cm D. 9.3cm I was sure ...
October 5, 2010 by Anonymous

math
A right circular cone is inscribed inside a sphere. The right circular cone has the radius of the base of 4 inches and the height is greater than 2 inches. The sphere has a radius of 5 inches. What is the ratio of the volume of the cone to the volume of the sphere? Leave your ...
March 6, 2011 by Jessica

geometry
Given two spheres, if the volume of the first sphere is 36r, and the volume of the second sphere is 288r, what is the relation of the second radius to the first radius?
August 1, 2011 by sonia

Math- Radius
The volume of a sphere is V = 14,130 ft3. What is its surface area? What is it's radius? The volume of a sphere is V = 4443 m3. What is its surface area? What is it's radius?
May 13, 2012 by Mike

Calculus (Parts A and B done, just help with C)
The radius, r, of a sphere is increasing at a constant rate of 0.05 meters per second. A. At the time when the radius of the sphere is 12 meters, what is the rate of increase in its volume? B. At the time when the volume of the sphere is 36pi cubic meters, what is the rate of ...
January 17, 2012 by Mishaka

Geometry 10th
A cone is inscribed in a sphere with a radius of 5 centimeters.The distance from the center of the sphere to the center of the base of the cone is x. Write an expression for the volume of the cone in terms of x (Hint: Use the radius of the sphere as part of the height of the ...
April 17, 2012 by CP

math
1. Sphere C(-2,1,-3), radius=7. T plane at (4,-2,-1)=? (a) 6x-3y+2z=0 (b) r.(6,3,2)=28 (c) 5x-3y-2z=28 (d) r.(6/7,-3/7,2/7) 2. Sphere (x-1)+(y-5)+(z-2)=49 and planr r.(-2,-6,-3)=0 form which circle?(a) (x-1)+(y-5)+(z-2)=19.53 (b) C(0,0,0), radius=4.42 (c) radius=4.42, C...
March 11, 2010 by Anonymous

maths
1. Sphere C(-2,1,-3), radius=7. T plane at (4,-2,-1)=? (a) 6x-3y+2z=0 (b) r.(6,3,2)=28 (c) 5x-3y-2z=28 (d) r.(6/7,-3/7,2/7) 2. Sphere (x-1)+(y-5)+(z-2)=49 and planr r.(-2,-6,-3)=0 form which circle?(a) (x-1)+(y-5)+(z-2)=19.53 (b) C(0,0,0), radius=4.42 (c) radius=4.42, C...
March 12, 2010 by Anonymous

math
A balloon in the shape of a sphere is deflating. Given that t represents the time, in minutes, since it began losing air, the radius of the ballon (in cem) is r(t)=16-t. Let the equation V(r)= 4/3 pi r^3 represent the volume of a sphere of radius r. Find (V (open dot) r)(t)
March 12, 2010 by andrea

Calculus
A ball of radius 12 has a round hole of radius 6 drilled through its center. Find the volume of the resulting solid. I tried finding the volume of the sphere and the volume of the cyclinder then subtract however that did not work.
April 27, 2009 by Anonymous

Math Calculus
A sphere is initially measured as having a radius of 4 inches. A subsequent measurement shows that the radius is really 3.99. Find (a) the actual difference in volume between the initial measurement and the correction, and (b) the difference as estimated through differentials...
July 8, 2011 by Megan

physics electricity & magnetism
Charge Q=4 micro-coulombs is distributed uniformly over the volume of an insulating sphere of radius R=.05 meters. What is the potential difference between the center of the sphere and the surface of the sphere? How do I approach this problem? I tried integrating dV=-Edr from ...
December 3, 2011 by cooper

GEOMETRY
Sphere and hemisphere have same volume. Radius of sphere =7cm
February 16, 2011 by reshma

math
If the radius of the sphere above is 5 inches, what is the volume of the sphere? (Assume pi = 3.14)
October 28, 2010 by anonymous

surface area and volume
I really need some help, I don't fully understand. Exspecially with fractions, don't know how to enter them on calculator. 1. What is the approximate volume of the sphere? 524 m (my choice) 1,000 m 1,256 m 1,570 m 2. What is the approximate surface area of the sphere? 225 ...
April 29, 2012 by lilman

Calculus
V=4/3 pi r ^3 is the formula for the volume of a sphere. Find dV for a sphere if the radius of 10" is increased by .1" Please help. I have no idea how to do this problem!
November 14, 2011 by Michael

Physics
2) A solid nonconducting sphere of radius R = 5.6cm has a nonuniform charge distribution or volume charge density p= (1.41pCm^-3)r/R, where r is the radial distance from the sphere's center. a) What is the sphere's total charge? b) Calculate AND sketch a graph of E versus r.
November 24, 2010 by Ri

Math
A pyramid is inscribed in a cube whose volume is 52pi cm^3. The volume of a sphere is equal tpo the volume of this pyramid. Find the volume of a second cube whose edge is equal to the radius of the sphere.
May 30, 2011 by Eli

Math
The surface area and the volume of a sphere are both 3 digit integers times π. If r is the radius of the sphere, how many integral values can be found for r?
December 26, 2013 by Xian

Math
If a sphere has radius 5 m. what is the volume of the sphere?
January 17, 2011 by pop

Math
If a sphere has radius 5 m. what is the volume of the sphere?
January 18, 2011 by freddy

Calculus
Hi there i am having some problems trying to do my calculus homework and i really need help on how to show the step to proof the volume of a sphere which is V= 4/3pirsquare. But I have to use triple integral to proof the volume of a sphere. Please help me and give me some good...
November 25, 2009 by shylo

PHYSICS
A 494 kg uniform solid sphere has a radius of 0.390 m. Find the magnitude of the gravitational force exerted by the sphere on a 49.1 g particle located (a) 1.45 m from the center of the sphere 1 ? N (b) at the surface of the sphere 2 ? N (c) 0.200 m from the center of the ...
March 21, 2011 by Steve

Physics - Astronomy
What (decimal) fraction of a hypothetical spherical planet's volume does a planetary core with a radius of 70% of that planet's radius have? Round off answer to three decimal places. [Hint: the volume of a sphere is equal to 4/3 pi times the radius cubed]
November 15, 2012 by Leslie

Math
A pyramid is inscribed in a cube whose volume is 52(pi) cm^3. The volume of a sphere is equal to the volume of this pyramid. Find the volume of a second cube whose edge is equal to the radius of the sphere.
May 31, 2011 by Joe

calculus
The radius of a spherical balloon is increasing at a rate of 2 centimeters per minute. How fast is the volume changing when the radius is 8 centimeters? Note: The volume of a sphere is given by 4(pi)r^3
October 3, 2011 by Anonymous

physics
A solid sphere of mass m and radius r rolls with out slipping along the track.it starts from rest with the lowest point of tthe sphere at aheight h above the bottom of the loop of radius R,much larger than r.(a) what is the minimum value of h (interms of R)such that the sphere...
January 12, 2013 by Anonymous

math --- check my work!
1.Find the surface area for a sphere with a radius of 10 feet. Round to nearest whole number. 1,256 ft2*** 4,189 ft2 1,089 ft2 1,568 ft2 2.Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number. 1,257 ft3 4,187 ft3*** 1,089 ft3 1,568 ft3 3.Find...
March 19, 2014 by TTR+S<3

geometry
If given 2 spheres, if the volume of the first sphere is 3/4 and the volume of the second sphere is 36, which is the relation of the second radius to the first?
May 22, 2011 by alex

I need help on a geometry cone/frustrum problem
A sphere with radius 3 is inscribed in a conical frustum of slant height 10. (The sphere is tangent to both bases and the side of the frustum.) Find the volume of the frustum. Could someone help me? I can't find the radius of the cone....
February 16, 2013 by Knights

Pre-Algebra
For numbers 13, find the indicated measurement of the figure described. Use 3.14 for (pi) and round to the nearest whole number. 1) Find the surface area of a sphere with a radius of 8 cm. a. 268 cm2 b. 804 cm2 c. 2,144 cm2 d. 201 cm2 2) Find the surface area of a sphere with...
March 13, 2013 by Selena

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
Hi! I need a bit of help with 10 Physics problems. I have about 70, but these are the ones I either didn't get or needed help with. Thank you so much!! What is the decimal equivalent of 3.14 10 7? What is the decimal equivalent of 2.8 e-4? (In the JavaScript web language, ...
August 24, 2009 by Yulia

ryan
You propose to build a space ship that allows the entire population of the United States (280 million) to leave earth. Your plans allocate an average space of 1,000(=10*10*10) cubic feet to each person. You space ship is going to have the shape of a sphere. The radius of you ...
October 8, 2010 by math word problem

Science
One edge of a copper cube is carefully measured and found to be 2.162 cm. An atom of copper is a sphere 0.2560 nanometers in diameter. Assuming that the volume of the cube contains nothing but copper atoms, how many copper atoms are contained in the cube? (the volume of a cube...
September 24, 2011 by Laurel

PHYSICS URGENT DUE IN 15 MINUTES
The figure below (a) shows a sphere with a radius of r = 157 mm (density = 1.24 g/cm) suspended in water by a string. The ball is completely submerged in the water and the string is attached from the bottom of the water tank to the bottom of the sphere. What is the tension ...
March 24, 2011 by Anonymous

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
The earth has a radius of 6,380 km. The formula for the volume of a sphere is �� V = 4/3 x^3, and the formula for surface area of a sphere is A = 4x^2 . Find the volume and surface area of the earth and write the answer in scientific notation with two numbers ...
November 3, 2010 by james

Pre-Algebra
1) Find the surface area for a sphere with a radius of 10 feet. Round to the nearest whole number. a. 1,256 ft2 b. 4,189 ft2 c. 1,089 ft2 d. 1,568 ft2 2) Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number. a. 1,257 ft3 b. 4,187 ft3 c. 1,089...
March 12, 2013 by Destiny

Physics
A hollow sphere of radius 25 cm is rotating at 13 rad/ sec about an axis that passes through its center. The mass of the sphere is 3.8 kg. assuming a constant net torque is applied to the sphere, how much work is required to bring the sphere to a stop?
July 8, 2012 by hayley

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

Help Damon Ms.Sue
1.Find the surface area for a sphere with a radius of 10 feet. Round to the nearest whole number. 1,256 ft2 4,189 ft2 1,089 ft2 1,568 ft2 2.Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number. 1,257 ft3 4,187 ft3 1,089 ft3 3.Find the surface...
March 14, 2013 by Lila

math (calculus)
A cap of a sphere is generated by rotating the region about the y-axis. Determine the volume of this cap when the radius of the sphere is 5 inches and the height of the cap is 1 inch.
February 13, 2011 by ellen

math (calculus)
A cap of a sphere is generated by rotating the region about the y-axis. Determine the volume of this cap when the radius of the sphere is 5 inches and the height of the cap is 1 inch.
February 13, 2011 by ellen

Maths B
Hi, i was just wondering if you could help me with how to work out this question, as i have attempted and get a bit confused at the end. here it is: A cylinder is inside a sphere- the sphere has a radius of R. What is the maximum volume of the cylinder? Thanks - really ...
November 2, 2010 by Jess

Pre-Algebra
1) Find the surface area for a sphere with a radius of 10 feet. Round to the nearest whole number. a. 1,256 ft2 b. 4,189 ft2 c. 1,089 ft2 d. 1,568 ft2 2) Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number. a. 1,257 ft3 b. 4,187 ft3 c. 1,089...
March 13, 2013 by Alexa

Geometry
Can someone please check these for me. I have to leave answers in Pi. Find the Volume of a right cone with radius 6 height 10 V=1/3 pi r squared*h =1/3pi (6)^2(10) =1/3(360)pi =120pi Find the volume of a sphere with radius 3cm V=4/3 pi r^3 =4/3 pi3^3 =4/3(27)pi =36pi They ...
July 9, 2007 by DANIELLE

Science/Volume
Okay, if the circumference of a sphere is 3.9 x 10^4 (scientific notation) and its radius is 6.2 x 10^3, then what is its volume? I know how to do the calculations, but the answers I get don't seem to make sense!
September 14, 2008 by A 9th grader

physics
A volume of gas v at temperature T1 and pressure P, is enclosed in a sphere. It is connected to another sphere of volume v/2 by tube and stopcock. This second sphere is initially evacuated and the stopcock is closed. If the stopcock is now opened and the temperature of the gas...
March 21, 2012 by Joanna

physics
A volume of gas v at temperature T1 and pressure P, is enclosed in a sphere. It is connected to another sphere of volume v/2 by tube and stopcock. This second sphere is initially evacuated and the stopcock is closed. If the stopcock is now opened and the temperature of the gas...
March 21, 2012 by Joanna

physics
A volume of gas v at temperature T1 and pressure P, is enclosed in a sphere. It is connected to another sphere of volume v/2 by tube and stopcock. This second sphere is initially evacuated and the stopcock is closed. If the stopcock is now opened and the temperature of the gas...
March 21, 2012 by Joanna

physics
A volume of gas v at temperature T1 and pressure P, is enclosed in a sphere. It is connected to another sphere of volume v/2 by tube and stopcock. This second sphere is initially evacuated and the stopcock is closed. If the stopcock is now opened and the temperature of the gas...
March 21, 2012 by Joanna

Physics
Mountain pull. A large mountain can slightly affect the direction of down as determined by a plumb line. Assume that we can model a mountain as a sphere of radius R = 3.00 km and density (mass per unit volume) 2.6 103 kg/m3. Assume also that we hang a 0.250 m plumb line at...
May 2, 2014 by Sandra

Math
A sphere is inscribed in a right cone. The slant height of the cone = the diameter of the base of cone. If the radius of the sphere is r, find the volume of the cone in terms of r.
March 22, 2012 by Maya

algebra II
A formula for the volume of a sphere is V=4/3 pie r^2. If the radius is 6c^2d^3, what is the volume of the sphere? a. 288 pie c^6d^9 b. 288 pie c^5d^6 c. 8 pie c^2d^9 d. 216 pie c^6d^9 If you could explain this to me.thanks and how do you find x int of a linear function. I've ...
January 9, 2008 by jack

math
The radius of one sphere is twice as great as the radius of a second sphere. Find the ratio of their surface areas.
July 9, 2014 by kyle

Calculus I
*Optimization problem* [I don't know how to get to the answer] Problem: You have a cylindrical can with radius 4cm and height 10cm. Inside is a marble with a radius that has to be larger than 0 but less than 4 cm (even the largest marble will fit entirely). You're filling it ...
November 12, 2012 by Ken

Geometry
A plane intersects a sphere that has a radius of 13cm. 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. 8cm B. 10cm C. 12cm D. 13cm Could please shed ...
May 19, 2011 by Chica

Geometry
Four identical metal spheres, each with radius 6 cm, are melted and reshaped into one big sphere. Fine the radius of the new sphere.
August 15, 2010 by Kyle

Physics (E&M)
1/2Eo times ( (volume integral)E^2 dtau + (surface integral)E PHI da ) That's the equation, the first integral is over the voume of a surface charged (q) sphere of radius a > R (radius of sphere) so a Gaussian surface beyond the sphere and the second is over the surface, ...
October 23, 2006 by lucca

physics
solid sphere of uniform density starts from rest and rolls without slipping down an inclined plane with angle = 30o. The sphere has mass M = 8 kg and radius R = 0.19 m . The coefficient of static friction between the sphere and the plane is = 0.64. What is the magnitude of...
March 31, 2013 by phil

physics
A solid uniform sphere has a mass of 7.0 104 kg and a radius of 1.2 m. (a) What is the magnitude of the gravitational force due to the sphere on a particle of mass m = 0.7 kg located at a distance of 2.1 m from the center of the sphere? N (b) What if it is 1.0 m from the ...
July 16, 2010 by Sam

Geometry/Algebra/Calculus
Why isn't the surface area of a sphere with radius r the following: 2*pi * (pi*r) That comes from the following flow of logic: Doesn't it makes sense to think of the surface area of the sphere with radius r as the the circumference of the semi-circle with radius r, pi*r (2*pi*...
January 26, 2014 by John

Physics
A sphere with a moment of inertia 0.658mr2 and mass m and radius r rolls without slipping along the track shown on a planet where the acceleration due to gravity is g. It starts from rest at a height h = 4.87R above the bottom of the circular loop of radius R. (For simplicity...
November 2, 2012 by REEEEEEEE

Math
What is the volume of a sphere with a radius of 5 cm?
May 27, 2008 by Nancy

chemistry
what is the volume of a sphere that has a radius, r = 3 in.
July 30, 2012 by bryce

Calculus
A cone is inscribed in a sphere of radius a, centred at the origin. The height of the cone is x and the radius of the base of the cone is r, as shown in the diagram opposite. Find the height, x, for which the volume of the cone is a maximum. (HINT: show that the volume of the ...
May 6, 2013 by Grant

Math
Find the volume of a barber's pole having the shape of a right circular cylinder of radius 5 in. and height 29 in. topped by a sphere of the same radius. Round to the nearest tenth, if necessary.
October 31, 2009 by Brandi

geometry
Find the volume of a barber's pole having the shape of a right circular cylinder of radius 5 in. and height 29 in. topped by a sphere of the same radius. Round to the nearest tenth, if necessary.
October 14, 2010 by Anonymous

math
RATES OF CHANGE QUESTION A spherical balloon is being blown up so that its volume is increasing by 0.6 m^3 s^-1. Find the rate at which the radius is increasing when the radius is 0.1 m. So what I did was that I determined dV/dt =0.6 and dV/dr = 4/3 r^3 phi (which is the ...
June 13, 2010 by tina

Physics!!!
The electric field everywhere on the surface of a charged sphere of radius 0.260 m has a magnitude of 545 N/C and points radially outward from the center of the sphere. (a) What is the net charge on the sphere?
January 20, 2012 by Help

Physics!!!
The electric field everywhere on the surface of a charged sphere of radius 0.260 m has a magnitude of 545 N/C and points radially outward from the center of the sphere. (a) What is the net charge on the sphere?
January 20, 2012 by Help

physics
A metal sphere of radius 5.00 cm is initially uncharged. How many electrons would have to be placed on the sphere to produce an electric field of magnitude 1.59 105 N/C at a point 7.98 cm from the center of the sphere?
September 12, 2012 by Allie

physics
The nucleus of a hydrogen atom is a single proton, which has a radius of about 1.0 10-15 m. The single electron in a hydrogen atom normally orbits the nucleus at a distance of 5.3 10-11 m. What is the ratio of the density of the hydrogen nucleus to the density of the complete ...
December 1, 2006 by MIke

Physics
One cubic meter (1.00 m^3) of aluminum has a mass of 2.70 multiplied by 10^3 kg, and the same volume of iron has a mass of 7.86 multiplied by 10^3 kg. Find the radius of a solid aluminum sphere that will balance a solid iron sphere of radius 1.40 cm on an equal-arm balance.
August 27, 2010 by Z32

math
direct variation the surface area of a sphere varies directly as the square of the radius. if the surface area of a sphere is 36 pi meters squared when the radius is 3 meters, what is the surface area of a sphere with a radius of 6 meters? S=k*r^2 solve for k first.
May 21, 2007 by anonymous

Math - Calculus
Im trying to understand related rates here and im getting stuck at this word problem. It says if V is the volume of a sphere with radius r, and the volume of the sphere decreases as the time passes. express dV/dt in terms of dr/dt. Describe the relationship in words. I dont ...
December 7, 2006 by Cosmo

geometry
a hemispherical bowl of radius r cm is filled with water.a sphere of radius r/2 cm is immersed in it.show that the volume of water displaces is pie r square/2 c.c.
March 14, 2012 by arvind

math
a hemispherical bowl of radius r cm is filled with water.a sphere of radius r/2 cm is immersed in it.show that the volume of water displaces is pie r square/2 c.c.
March 14, 2012 by help me out it's urgent

thermodynamics
A volume of gas V at temperature T1 and pressure P is enclosed in a sphere. If is connected to another sphere of volume V/2 by a tube and stop cork. This second sphere was initially evacuated and the stop cork is closed. If the stop cork is now opened and the temperature of ...
March 31, 2012 by frank fred

math
What is the volume of a sphere with a 10 inch radius?
September 25, 2011 by Mika

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