Thursday

October 23, 2014

October 23, 2014

Number of results: 13,277

**mathematics**

What is the solution for this? The surface area of a sphere varies in direct proportion to the square of its radius. If a sphere of radius 6cm has a surface area of 452 square cm, find, to the nearest mm, the radius of a spherewith the surface area 1000 square cm.
*October 29, 2011 by Richelle*

**math**

A ball is thrown upward with an initial velocity of 35 meters per second from a cliff that is 80 meters high. The height of the ball is given by the quadratic equation h = -49t^2 + 35t + 140 where h is in meters and t is the time in seconds since the ball was thrown. Find the ...
*March 7, 2013 by Please help me.*

**Math**

The surface area of a golf ball is 8.92 in ^2. The surface area of a softball is 53.78. Find the ratio of the volumes of a golf ball to a softball. Surface Area = 4π r^2 and Volume = 4/3π r^3 I don't understand this problem, could someone please help me?
*February 8, 2012 by Brianna*

**classical mechanics**

Gliding mass stopped by spring and friction (12 points possible) A small block of mass m=1 kg glides down (without friction) a circular track of radius R=2 m, starting from rest at height R. At the bottom of the track it hits a massless relaxed spring with spring constant k= 7...
*January 10, 2014 by juanpro*

**Physics**

A solid rubber ball has a diameter of 8.0 cm. It is released from rest with the top of the ball 80 cm above a horizontal surface. It falls vertically and then bounces back up so that the maximum height reached by the top of the ball is 45 cm, as shown. 80 60 40 20 If the ...
*May 31, 2014 by Jeevan*

**physics**

A 95 N block rests on a table. The sus- pended mass has a weight of 22 N. What frictional force is required to keep the blocks from moving? Answer in units of N.
*January 9, 2011 by help !*

**Physics**

Let us assume that the muon production happens at an altitude of about 15 kilometers above the surface of the Earth, and that the produced muons have a velocity of 0.99 c. Thus, in the Earth system, it takes the muon approx. 50500 nanoseconds to reach the surface of the Earth...
*April 24, 2011 by Tisha*

**Chemical Oceanography**

Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units. ------ represents a Box outline Surface...
*April 22, 2010 by josh*

**PHYSICS PLEASE HELP **

Suppose a distant world with surface gravity of 7.12 m/s2 has an atmospheric pressure of 7.48 104 Pa at the surface. (a) What force is exerted by the atmosphere on a disk-shaped region 2.00 m in radius at the surface of a methane ocean?____________N (b) What is the weight of a...
*November 8, 2012 by AMY*

**Physics**

A block slides from rest with negligible friction down a track, descending 5.0m to point P at the bottom. It then slides on the horizontal surface. The coefficient of friction between the block and the horizontal surface is 0.20. How far does the block slide on the horizontal ...
*December 29, 2012 by Anonymous*

**Physics**

Two cubic blocks are in contact, resting on a frictionless horizontal surface. The block on the left has a mass of mL = 6.70 kg, and the block on the right has a mass of mR = 18.4 kg. A force of magnitude 112 N is applied to the left face of the left block, toward the right ...
*May 25, 2012 by Mary*

**math?**

how do i figuire this problem out? .. A deep-sea diver must descend and ascend in short steps to equalize pressure on his body. If the diver rises toward the surface too fast, he may suffer from a physical condition called “the bends.” Suppose the diver started at 82 feet ...
*May 5, 2014 by matt*

**physics**

Two cubic blocks are in contact, resting on a frictionless horizontal surface. The block on the left has a mass of mL = 6.70 kg, and the block on the right has a mass of mR = 18.4 kg. A force of magnitude 112 N is applied to the left face of the left block, toward the right ...
*October 31, 2010 by caroline*

**kinetics**

a ball of mass 200 g is thrown vertically upwards with a velocity of 20ms-1 ignoring air resistance. a) calculate the kinetic energy of the ball as it is released b)calculate the maximum height reached by the ball c) state the velocity of the ball when it returns to its ...
*March 8, 2012 by dmkp*

**kinetics**

a ball of mass 200 g is thrown vertically upwards with a velocity of 20ms-1 ignoring air resistance. a) calculate the kinetic energy of the ball as it is released b)calculate the maximum height reached by the ball c) state the velocity of the ball when it returns to its ...
*March 16, 2012 by dmkp*

**Physics**

A ball is thrown vertically up and from the ground with a velocity of 20ms. Calculate: a-The maximum length reached. b-The time to reach the maximum height. c-The time to reach the ground again after the ball is thrown up. d-The velocity reached halfway to the maximum height. ...
*September 23, 2011 by Hauwart*

**physical science 2**

A block is dragged at constant velocity in a straight line path across a level surface by force of 6 N. What is the friction between the black and the surface? a: 6 N B: less than 6 N C: More than 6N d: ZERO
*January 29, 2011 by ellen*

**University Calculus**

Set up (do not evaluate) the integral that gives the surface area of the surface generated by rotating the curve y=tanhx on the interval (0, 1) around the x-axis. Anyone who can help? Not really sure how to even begin! Thanks
*May 13, 2011 by Angie*

**physics**

a 1.2 kg cart slides eastward down a frictionless ramp from a height of 1.8 m and then onto a horizontal surface where it has a head-on elastic collision with a stationary 2.0 kg cart cushioned by an ideal Hooke's law spring. the maximum compression of the spring during the ...
*November 18, 2013 by LENA*

**physics**

Problem A5: In the figure above, the two blocks are on frictionless inclines and are in static equilibrium. The block on the left has a mass of 48 Kg, and the block on the right has a mass of n3 Kg. If the left incline has a length of n1 meters, and the right incline a length ...
*January 10, 2012 by frank*

**physics**

A 1.20 kg mass on a horizontal spring oscillates on a frictionless surface with a displacement as a function of time given by x(t) = 0.075cos(4.16t – 2.45). (Units are standard units.) a.) Find the time for one complete vibration. b.) Find the force constant of the spring. c...
*July 31, 2012 by Lauren*

**Physics**

A 15 kg model airplane flies horizontally at point A that is 20 m about point B. It has a speed of 19.993 m/s at point A. It then flies horizontally at point B. If the loss of potential energy is reflected as an increase in kinetic energy, what is the speed of the model ...
*November 17, 2011 by Brooke*

**science**

A block of mass 0.5 kg is pushed a distance x against a spring with k=450 N/m. When released the block slides along a frictionless horizontal surface to a point B, the bottom of a vertical circular track of radius R=1 meter. The track is not smooth. When the block reaches ...
*June 18, 2011 by claire*

**physics**

Airplane flight recorders must be able to survive catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the tests is an impact shock test, in which the box must survive being thrown...
*January 26, 2011 by John*

**Physics**

Airplane flight recorders must be able to survive catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the tests is an impact shock test, in which the box must survive being thrown...
*October 3, 2012 by Donald*

**physics**

A 0.50-kg block, starting at rest, slides down a 30.0° incline with kinetic friction coefficient 0.30 (the figure below). After sliding 84 cm down the incline, it slides across a frictionless horizontal surface and encounters a spring (k = 33 N/m). (a) What is the maximum ...
*February 28, 2012 by Angel*

**physics**

A 0.50-kg block, starting at rest, slides down a 30.0° incline with kinetic friction coefficient 0.30 (the figure below). After sliding 84 cm down the incline, it slides across a frictionless horizontal surface and encounters a spring (k = 33 N/m). (a) What is the maximum ...
*February 29, 2012 by Angel*

**physics**

A block with a mass of 0.5kg is pushed against a horizontal spring of negligible mass and spring constant 450 N/m until the spring is compressed a distance x. When it is released, the block travels along a frictionless, horizontal surface to the bottom of a verticle circular ...
*March 28, 2012 by natasha*

**calculus**

the weight of a person on or above the surface of the earth varies inversely as the square of the distance the person is from the center of the earth. if a person weighs 180 pounds on the surface of the earth and the radius of the earth is 3900 miles, what will the person ...
*June 23, 2014 by Anonymous*

**physics**

Part 1: A ball is thrown horizontally from the top of a building 28.6 m high. The ball strikes the ground at a point 80.3 m from the base of the building. The acceleration of gravity is 9.8 m/s^2. Find the time the ball is in motion. Answer in units of s. Part 2: Find the ...
*October 25, 2010 by autumn*

**Phys**

Three blocks on a frictionless horizontal surface are in contact with each other. A force F is applied to block A (mass mA). (a) Draw a free body diagram for each block. I've drawn it and it looks like this, but I'm not sure if I'm including everything. ^normal force F-->|...
*February 7, 2013 by anonymous*

**physics**

Question Part Points Submissions Used 1 2 3 4 5 –/5 –/5 0/5 –/5 2/2 0/10 0/10 1/10 0/10 2/10 Total 2/22 A block of mass m = 2.00 kg is released from rest at h = 0.400 m from the surface of a table, at the top of a θ = 35.0° incline as shown below. The frictionless incline...
*October 19, 2011 by carlton*

**Physics**

ok part (b) A 4.0 kg block is stacked on top of a 12.0 kg block, whcih is accelerating along a horizontal table at a = 5.2 s^-2 m. Let Mu k = Mu s = Mu. (a) What mininum coefficent of friction Mu between the two blocks will prevent the 4.0 kg block from sliding off? (b) If Mu ...
*August 20, 2009 by QUESTION*

**Physics**

At what altitude above the Earth's surface would your weight be three-fourths of what it is at the Earth's surface? Assume re = 6.371 10^3 km.
*October 3, 2009 by Amanda*

**Physics**

True/false. Light reflected from a glass surface is polarized along the plane perpendicular to the glass surface
*December 16, 2009 by Tiffany*

**Calculus**

S=6x^2 is the surface area of a cube. Find the exact change in surface area when x is increased from 6 cm to 6.1 cm . Please Help. It makes no sense.
*November 14, 2011 by MiKe*

**Geometry**

The base of the prism is a rectangle with sides 13 m and 5 m in length. Find the lateral surface and surface area of the given prism.
*May 5, 2012 by JC*

**Science**

An electric dipole of dipole moment 20*10^-6c.m. Is enclosed by a closed surface .what is the net flux coming out of the surface?
*May 30, 2012 by Bhaskar*

**Physics**

An object with a weight of 30 newtons is placed on a flat, level surface. What is the normal force that the surface pushes on the object with?
*November 14, 2012 by Olivia*

**maths --plse help me..**

A cuboid has total surface are 40cm^2 and its lateral surface area is 26cm^2.find the area of its base.
*December 17, 2012 by Anamika*

**math**

what is the surface area of the cube below? answer in simplest radical form. One surface of the cube is 576 cm^3
*December 29, 2013 by Francois*

**Calculus, Surface Area**

An open rectangular box (no top) has a square base with side 10 cm and height 16 cm. The surface area is:
*February 17, 2014 by Anonymous *

**science**

A ball is throen vertically downward from the rop of a 36.6 m tall building . The ball passes the top of a window that is 12.2 m above the groung 2.00s after being thrown. What is the speed of the ball as it passes the top of the window? Would i need to use this equation v= v0...
*September 12, 2006 by Jen*

**physics**

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x0 = 1.7 m from...
*October 10, 2013 by mark*

**Physics**

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x0 = 1.7 m from...
*October 10, 2013 by Anonymous*

**physics**

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x0 = 1.7 m from...
*October 11, 2013 by anon*

**trig**

the basic N of an antenna rests on horizontal ground. the angle of elevation of the top R from a pt H on the ground is 42 degrees
*October 17, 2011 by Anonymous*

**physics**

A car decelerates from 30 m/s and rests at 6 seconds in a period of 5 m/s. How far did the car travel during that time.
*September 21, 2012 by Anonymous*

**Physics**

A rectangular surface (0.13 m 0.36 m) is oriented in a uniform electric field of 570 N/C. What is the maximum possible electric flux through the surface?
*August 30, 2007 by Mary*

**science**

how do the fluxes of radiation help explain why air temperature near the earth's surface is higher than it is 2km above the earth's surface
*October 12, 2010 by cary*

**11th grade physics**

how high above the surface of the Earth would an object need to be for its weight to be half its weight on the surface?
*November 8, 2010 by Archie*

**physics**

At what altitude above the Earth's surface would your weight be two-thirds of what it is at the Earth's surface? (Assume Re = 6.371 103 km.)
*February 17, 2011 by melad *

**Algebra**

How do I calculate finding the weight of someone, on the earth's surface with a radius of 3900 miles, and their weight 625ft above the surface?
*July 16, 2011 by Mac*

**Algebra II**

The light source located 2.75 m from a surface produces an illumination of 528 lux on that surface. Find the illumination if the distance is changed to 1.55 m.
*November 21, 2011 by Arielle*

**physics**

9. The surface of the earth is approximately 6,400 km from its center. If the mass of the earth is 6.0 x 1024 kg, what is the acceleration due to gravity near the surface?
*December 15, 2011 by Anonymous*

**Maath**

The surface area S of the rectangular solid in the figure is S = 2(24) + 2(4x) + 2(6x). Find the length x of the box if the surface area is 248 square centimeters.
*September 18, 2012 by Kelly Vitteli*

**Physics**

A 25.2-kg object is moving rightward across a horizontal surface with a speed of 14.3 m/s The coefficient of friction between the object and the surface is 0.490.
*January 10, 2013 by Steven*

**physics**

The electric field at the surface of a uniformly charged sphere of radius 6.0cm is 90kN/C . What would be the field strength 10 cm from the surface?
*September 3, 2013 by Deddie*

**Physics**

A 0.300 kg puck, initially at rest on a frictionless horizontal surface, is struck by a 0.215 kg puck that is initially moving along the x axis with a velocity of 2.14 m/s. After the collision, the 0.215 kg puck has a speed of 1.14 m/s at an angle of q = 53.5 deg to the ...
*September 30, 2012 by Arthur*

**physics**

A closed surface encloses a net charge of 0.00000210 C. What is the net electric flux through the surface?
*September 12, 2008 by Erin*

**physics**

how high above the surface of the Earth would an object need to be for its weight to be half its weight on the surface?
*November 8, 2010 by Archie*

**physics**

how high above the surface of the Earth would an object need to be for its weight to be half its weight on the surface?
*November 8, 2010 by Archie*

**Physics-Please Help Me!!**

5.Assuming the surface tension of water is .073 N/m, what is the force required to overcome the surface tension?
*November 15, 2010 by Amber*

**math (surface area)**

i know the formula of a rectangles surface area is SA= 2(lw)+(wh)+(lh), but when the dimensions are : 2a for the height, a for the width, and 3a for the length, how do i solve?
*January 23, 2011 by aleasha*

**geometry**

1.The surface area of a rectangular prism is 150 cm². If all the sides are tripled, what will the new surface area be?
*August 10, 2011 by kee*

**SCIENCE**

AT WHAT HEIGHT ABOVE THE EARTH'S SURFACE DOES THE ACCELERATION DUE TO GRAVITY FALL TO 1% OF ITS VALUE AT THE EARTH SURFACE
*December 9, 2012 by DEEPAK*

**physics**

The gravitational field intensity at a height of 150 km above the surface of Uranus is 8.71 N/kg. The radius of Uranus is 2.56 x 107 m. a. Calculate the mass of Uranus. b. Calculate the gravitational field intensity at the surface of Uranus. c. How much would a 100 kg person ...
*May 15, 2012 by matin*

**physics**

A water slide launches a child horizontally above a swimming pool. The distance from the top of the slide to the launch point is 2.76 m. The point where the child is launched horizontally is 0.7 m above the water. How far from the launch point does the child land in the water?
*September 20, 2014 by Dominique*

**Math-Algebra 2**

The surface area of a golf ball is 8.92 in ^2. The surface area of a softball is 53.78 in ^2. Find the ratio of the volumes of a golf ball to a softball. Surface Area = 4π r^2 and Volume = 4/3π r^3 I'm not sure if I did this problem right, but I think the answer is 0...
*February 9, 2012 by Brianna*

**Physics**

A 0.40-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3 m on a frictionless surface. If the cord will break when the tension in it exceeds 60 N, what is the maximum speed the ball can have? How would your answer be affected if there were ...
*December 24, 2010 by Matt*

**physics**

A 70 kg man weighs 686 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 14% of his body weight?
*December 19, 2010 by melissa*

**physics**

a uniform electric field of magnitude 2.5*10^4, makes an angle of 27 with a plane surface area of 0.0133m^2.what is the electric flux through the surface.
*March 6, 2011 by ike*

**physics**

A 80 kg man weighs 784 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 15% of his body weight?
*December 19, 2011 by alex*

**physics**

A 3.4-kg box is released on a horizontal surface with an initial speed of 4.8 m/s. It moves on the surface with a deceleration of 0.45 m/s2. Calculate the kinetic friction force on the box.
*January 3, 2012 by Robert*

**physics**

A uniform electric field of magnitude 2.10×10^4 makes an angle of 37 with a plane surface of area 1.60×10^−2 .What is the electric flux through the surface?
*January 27, 2012 by giga*

**math**

Two prisms are similar. The surface area of one is four times the surface area of the other. What is the ratio of the corresponding dimensions?
*April 13, 2012 by samantha*

**physics**

a box with a mass of 10 kg slides on a surface at 30m/s the coeffiecent of kinetic friction between the box and the surface is 0.5 what is the amount of frictional force
*November 24, 2012 by hector r*

**chem**

calculate the surface energy of 100 surface of niobium. The enthalpy of atomization of niobium is 745 kj/mol. express anser inunits of j/cm^2
*January 11, 2013 by larry*

**physics**

A 2.7-kg box is released on a horizontal surface with an initial speed of 2.9 m/s.It moves on the surface with a deceleration of 0.27 m/s^2.Calculate the kinetic friction force on the box
*March 13, 2013 by Naesha*

**Algebra**

A rock is dropped from a riverbank that is 4 feet above the surface of the river. After how many seconds does the rock hit the surface of the water? At highest?
*April 2, 2013 by Mary*

**Physics**

A man has a mass of 65kg on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 13% of his body weight?
*November 24, 2013 by Anonymous*

**physics**

What is the ratio of the gravitational force on you when you are 5800 km above the Earth's surface versus when you are standing on the surface? (The Earth's radius is about 6400 km.)
*February 1, 2014 by Anonymous*

**phsics**

A 75 kg man weighs 735 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 15% of his body weight?
*February 17, 2014 by Anonymous*

**Calculus**

Assume you wish to make a box whose base is a rectangle with one side twice as long as the other side and whose volume is 100 m^3. What would the minimum surface area be, if there is a minimum surface area? b) Under the same sceenerio as in (a), what would the maximum surface ...
*May 13, 2011 by Abigail*

**Physics: Manitude of Surface Charge on Dielectric**

An empty capacitor has a capacitance of 1.86 μF and is connected to a 12-V battery. A dielectric material (κ = 4.5) is inserted between the plates of this capacitor. What is the magnitude of the surface charge on the dielectric that is adjacent to either plate of the...
*May 10, 2013 by Phil-- HELP NEEDED ASAP*

**Math**

I have two problems (listed below): 1.The profit P (in hundreds of dollars) that a company makes depends on the amount x (in hundreds of dollars) the company spends on advertising according to the model P = 230 + 20x -0.5x^2. What expenditure for advertising will yield a ...
*March 4, 2008 by Danielle*

**physics**

Joe pushes horizontally on a heavy box across a rough surface at constant speed. Which one of the following statements concerning this situation is false? If Joe stops pushing on the box, the box will stop sliding eventually. If Joe doubles his force on the box, the speed of ...
*June 8, 2014 by Sam*

**PHYSICS!**

Given: G = 6.67259 × 10−11 Nm2/kg2 The acceleration of gravity on the surface of a planet of radius R = 3430 km is 4.43 m/s2.What is the period T of a satellite in circular orbit h = 7683.2 km above the surface? Answer in units of s
*February 7, 2012 by anonymous*

**Phyics**

Given: G = 6.67259 × 10−11 Nm2/kg2 The acceleration of gravity on the surface of a planet of radius R = 3430 km is 4.43 m/s2.What is the period T of a satellite in circular orbit h = 7683.2 km above the surface? Answer in units of s
*February 7, 2012 by anonymous*

**university physics**

A mass m1 = 7.65 kg, is at rest on a frictionless horizontal surface and connected to a wall by a spring with k = 67.9 N/m, as shown in the figure. A second mass, m2 = 5.29 kg, is moving to the right at v0 = 15.3 m/s. The two masses collide and stick together. the figure is ...
*November 20, 2012 by bülent*

**physics**

When a water gun is fired while being held horizontally at a height of 1.00 m above ground level, the water travels a horizontal distance of 4.80 m. A child, who is holding the same gun in a horizontal position, is also sliding down a 45° incline at a constant speed of 1.64 m/...
*October 5, 2014 by taylor*

**Physics**

5.Assuming the surface tension of water is .073 N/m, what is the force required to overcome the surface tension?
*November 15, 2010 by Amber*

**physics**

5.Assuming the surface tension of water is .073 N/m, what is the force required to overcome the surface tension?
*November 15, 2010 by Amber*

**math- surface and volume**

If volume increases by 60%, how much does the surface increase by? Please show work.
*October 13, 2012 by kate*

**Math: Surface Area**

How would you find the area of the curved surface between the top and bottom of a can?
*May 6, 2013 by Celest*

**GEOMETRY(SURFACE AREA)**

find the surface area of a square pyramid with s=4.2 cm and h=7cm( slant height)
*July 14, 2013 by dull*

**physics**

A 76-cd point source of light is 3.2 m above the surface of a desk. What is the illumination on the desk's surface in lux?
*January 23, 2014 by Felicia*

**Physics**

1. Tyler pulls a box full of baby ferrets across the floor by means of a rope that is tied to the box. The rope makes an angle of 41 degrees with the horizontal and tyler pulls on the rope with a force of 60N. a)What is the horizontal component of the force that tyler is ...
*June 21, 2011 by Anonymous*

**physics**

Two identical steel balls, each of mass 5.0 kg, are suspended from strings of length 29 cm so that they touch when in their equilibrium position. We pull one of the balls back until its string makes an angle θ = 25° with the vertical and let it go. It collides elastically...
*March 2, 2012 by Katie*

**nova**

7) You throw a 12-N stone vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work –energy theorem to find (a) the stone’s speed just as it left the ground and (b) its maximum height. 8) A ...
*September 20, 2014 by papy*

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