Wednesday

September 17, 2014

September 17, 2014

Number of results: 12,954

**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*

**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!**

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*

**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*

**Pre-Calculus**

A ball is thrown up at the edge of a 364 foot cliff. The ball is thrown up with an initial velocity of 72 feet per second. Its height measured in feet is given in terms of time t, measured in seconds by the equation h=−16t2+72t+364. How high will the ball go? To get how ...
*September 30, 2013 by Ann*

**physics**

Forces of 1,5,3, and F newtons are applied to a weightless board that rests on a fulcrum. The board doesn't rotate-what's the magnitude of the force F?
*May 24, 2012 by Jen*

**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*

**Math Homework**

1) Given the side of a square pyramid is 6cm and the altitude is 4cm calculate the surface area. 2) Given the side of a square pyramid is 12cm and the altitude is 8cm calculate the surface area. 3) Given the side of a square pyramid is 18cm and the altitude is 12cm calculate ...
*February 6, 2007 by Student*

**Science**

A block with a mass of 3.07 kg is placed at rest on a surface inclined at an angle of 44.6° above the horizontal. The coefficient of static friction between the block and the surface is 0.540, and a force of magnitude pushes upward on the block, parallel to the inclined ...
*February 25, 2011 by Sara*

**PHYSICS **

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 10...
*November 8, 2012 by Amy*

**Physics**

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
*October 15, 2010 by Jordan*

**Physics **

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
*March 23, 2011 by Jacob*

**physics**

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
*November 4, 2011 by Meagan*

**physics**

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
*October 23, 2012 by John*

**physics**

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
*November 4, 2012 by jim*

**physics**

a 1.4 kg block slides across a rough surface such that it slows down with an acceleration of 1.25 m/s2. What is the coefficient of kinetic frisction between the block and the surface?
*December 9, 2007 by ellimac*

**physics**

A 2.7 kg box is released on a horizontal surface with an inital speed of 2.9m/s. It moves on the surface with a deceleration of 0.27m/s^2. Calculate the kinetic friction force on the box?
*May 23, 2011 by bob*

**physics**

A 1.39-kg block slides across a rough surface such that it slows down with an acceleration of 1.43 m/s2. What is the coefficient of kinetic friction between the block and the surface?
*October 6, 2011 by Jamin*

**physics**

A 1.4-kg block slides across a rough surface such that it slows down with an accerleration of 1.2 m/s2. What is the coefficient of kinetic friction between the block and the surface?
*January 10, 2012 by amirah*

**Physics**

A uniform electric field of magnitude 2.70×10^4 N/C makes an angle of 37 degrees with a plane surface of area 1.60×10^−2 m^2 . What is the electric flux through this surface?
*January 23, 2012 by Cooper*

**physics**

A uniform electric field of magnitude 2.80×10 ^4 N/C makes an angle of 37 degrees with a plane surface of area 1.40×10−2 m^2. A)What is the electric flux through this surface? N * m^2/C
*January 27, 2012 by jazz*

**Astronomy**

Which of the terrestrial planets has the highest surface gravity? (Hint: if you look at ratios, you need not calculate every surface gravity value explicitly.)
*February 2, 2012 by Jobeth*

**physics**

A uniform electric field of magnitude 2.80×104 makes an angle of 37 with a plane surface of area 1.60×10−2 .What is the electric flux through this surface?
*February 4, 2012 by David*

**math**

Please help with this problem. Compute the following volume and surface area. A rectangular solid has sides of 7 cm, 9 cm, and 11 cm. What is its surface area. ________ square centimeters
*June 18, 2012 by Leo*

**Physics**

A 1.31-kg block slides across a rough surface such that it slows down with an acceleration of 1.39 m/s2. What is the coefficient of kinetic friction between the block and the surface?
*November 17, 2012 by Lyna*

**Physics**

A 1.31-kg block slides across a rough surface such that it slows down with an acceleration of 1.39 m/s2. What is the coefficient of kinetic friction between the block and the surface?
*November 17, 2012 by Caleb*

**Chemistry**

Calculate the surface energy of the (100) surface of niobium. The enthalpy of atomization of niobium is 745 kJ/mole. Express your answer in units of J/cm2.
*January 11, 2013 by Ankur*

**Chemistry**

Calculate the surface energy of the (100) surface of niobium. The enthalpy of atomization of niobium is 745 kJ/mole. Express your answer in units of J/cm2.
*January 11, 2013 by selly*

**science**

Calculate the surface energy of the (100) surface of niobium. The enthalpy of atomization of niobium is 745 kJ/mole. Express your answer in units of J/cm2.
*January 12, 2013 by harry*

**Calculus 3**

The following parametric equations describe a portion of a shperical surface: x=4cosusinv y=4sinusinv z=4cosv where 0<=u<=pi/4 and 0<=v<=pi/2 Find the surface area of this portion of the sphere.
*March 30, 2013 by Heather*

**Physics**

A man has a mass of 80kg on the Earth's surface. Part A How far above the surface of the Earth would he have to go to "lose" 13% of his body weight?
*September 26, 2013 by Joe*

**Calculus**

Can anybody help me with this? Consider the surface xyz = 20. A. Find the unit normal vector to the surface at the point (1, 4, 5) with positive first coordinate. (___,___,___) B. Find the equation of the tangent plane to the surface at the given point. Express your answer in ...
*October 15, 2007 by Mike*

**maths**

This question is about plotting two points and drawing the straight line through them. Which two options are correct instructions for plotting two points which can then be used to draw the line y=2x+5. Select one or more. A) Plot the points (1.3) and (2,-1) b) Plot the points...
*February 9, 2011 by Marian*

**mechanics 12**

A 1.8 kg breadbox on a frictionless incline of angle θ = 37° is connected, by a cord that runs over a pulley, to a light spring of spring constant k = 120 N/m, as shown in the figure below. The box is released from rest when the spring is unstretched. Assume that the ...
*November 2, 2012 by kunal *

**Physics**

A person, standing on a vertical cliff a height h above a lake, wants to jump into the lake but notices a rock just at the surface level with its furthest edge a distance s from the bottom of the cliff. The person realizes that with a running start it will be possible to just ...
*September 22, 2013 by ss01*

**physics**

We confirm the concept of the geothermal effect in an alternative fashion to the discussion in the text. We know that the average rate at which heat is conducted through the surface of the ground in North America is 54.0 mJ/(s m2). Assuming a surface temperature of -2 oC, what...
*November 23, 2010 by serena*

**physics**

( 1.) An objectis thrown upward from the edge of a tall building with a velocity of 10m/s. Where will the object be 3s after it is thrown? Take g = 10m/s^2 15m above the top of the building 30m below the top of the building 15m below the top of the building 30m above the ...
*October 12, 2011 by lawrence*

**math30**

The equation of the hyperbola is (x-3)^2/4 - (y+1)^2/16 =-1. What is the range? All I know is this but I am not even sure what I am doing!! My answer: The general form of the equation of a horizontally aligned hyperbola is: (x-h)^2/a^2 - (y-k)^2/b^2 =1. So the (y-k)^2/b^2 term...
*October 10, 2012 by alejandro*

**physic**

Two teams of nine members each engage in a tug of war. The first team's members have average masses of 69 kg and exert average forces of 1350 N horizontally. The second team's members have average masses of 74 kg and exert average forces of 1356 N horizontally.
*February 11, 2014 by tina*

**physics**

A rifle is aimed horizontally at a target 30 m away. The bullet hits teh target 1.9 cm below the aiming point. What are the a) teh bullet's time of flight and b) its speed as it emerges from the rifle? A) is expose to be 62ms B) is expose to be 480m/s this is from by book. But...
*October 24, 2006 by jenny*

**Physics **

Problem 2- A 15 kg block is attached to a very light horizontal spring of force constant 400 N/m and is resting on a smooth horizontal table as shown in the figure below. Suddenly it is struck by a 3 kg stone traveling horizontally at 8 m/s to the right, whereupon the stone ...
*January 12, 2014 by Mariam*

**Environmental Science**

Earth's surface water is found in a.lakes b.rivers c.streams d.all of the above I picked d. because that's where SURFACE water is at right? yup ditto.....
*April 20, 2007 by Mack*

**Physics **

A stationary 25kg object is located on a table near the surface of the earth. The coefficient of kinetic friction between the surface is 0.30. Determind the acceleratin of the object.
*November 17, 2010 by Charmaine*

**math**

the volume of an cylindrical can with a radius r cm and height h cm is 128000 c^3, show that the surface area of the can is A=2(22/7)r^2 + 246000/r. Find the value for r to minimize the surface area. *i know what the quest. ask but i do not know how to apply it.
*July 29, 2011 by Yuni*

**math**

If you are calculating surface area of a right circular cone topped with a hemisphere. the radius is 4 cm and the rt angle is 8 cm...what is the lateral surface area. Is it 8.94 or is it 9? Explain answer please. Thanks
*March 16, 2012 by trey*

**confederation college**

1.52 kg box slides 1.24 m a long a level surface.the co-efficient of kinetic friction between book and surface is 0.140.find the work done by friction?
*April 11, 2013 by karan*

**physics**

Calculate the mass of Jupiter knowing that a person who weighs 490 N on the earth's surface would weight 1293 N on the surface of that planet. Jupiter has a radius of 7.15 × 10^7 m.
*June 5, 2014 by grey*

**physics**

A 2-kg block rests on a wall that is 3 m tall. What is the gravitational potential energy of the block? The force of gravity on Earth (g) is equal to 9.8 m/s2.
*October 22, 2009 by roxy*

**calc**

Find the area of the surface obtained by rotating the curve of parametric x=3t-(3/3)t^3 y=3t^2 0<=t<=1 what is the surface area
*October 30, 2008 by alexis*

**9th grade**

a cube has a side that is (5x-3)centimeters long.a.what is its surface area?b.if x=3,what is its surface area
*January 27, 2010 by leona*

**geometry**

A sphere has a surface area of 32in².If the diameter is halved, find the surface area.
*March 1, 2012 by Edith*

**physics **

Which of the following statements is true about a mass, which is attached to a spring and moves with simple harmonic motion on a frictionless horizontal surface? Choose one answer. a. The kinetic energy of the mass is maximum at the end positions. b. The kinetic energy of the ...
*April 30, 2011 by ashley --- HELP PLEASEE!!!*

**mathematics**

two springs and two masses are attached in a straight line on a horizontal frictionless surface. the system is set in motion by given external force f(t) acting on the right hand mass m2. we denoted by x(t)the displacement(to the right) of mass m1 from static equilibrium ...
*October 17, 2010 by zainab*

**Calculus**

This is the questions I have trouble with : 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 Laura*

**Physics**

An objectis thrown upward from the edge of a tall building with a velocity of 10m/s. Where will the object be 3s after it is thrown? Take g = 10m/s^2 15m above the top of the building 30m below the top of the building 15m below the top of the building 30m above the building
*October 13, 2011 by Lawrence*

**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*

**physics**

A 0.46 kg object connected to a light spring with a spring constant of 18.0 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest. (a) Determine the maximum speed of the mass. unit = cm/s (b) Determine the speed of the mass...
*March 22, 2011 by :)*

**physics**

A skier with a mass of 70 kg starts from rest and skis down an icy (frictionless) slope that has a length of 52 m at an angle of 32° with respect to the horizontal. At the bottom of the slope, the path levels out and becomes horizontal, the snow becomes less icy, and the skier...
*March 3, 2010 by Larry*

**physics**

a 650 newton crate rests on the floor. how much work is required to move it at a constant speed, 3 meters against a friction force of 150 Newtons
*March 22, 2011 by melanie*

**PHYSICS _ please help**

A metal block of volume 1 * 10^3 cm^3 is suspended from a thread as shown in the diagram. It is lowered into a beaker of liquid of unknown density until it is completely immersed but does not touch the bottom of the beaker. The beaker rests on a balance. The reading of the ...
*August 9, 2011 by GAIL*

**PHYSICS**

In a laboratory experiment, a bullet of mass 47.0 g is shot horizontally into a stationary block of totara of mass 3.50 kg that hangs from a light string. The bullet is then embedded a distance d = 3.50 cm into the block and the combined block-bullet object moves at a speed of...
*March 28, 2011 by Gary*

**Physics**

A 1.40- block is on a frictionless, 20 inclined plane. The block is attached to a spring ( = 40.0 ) that is fixed to a wall at the bottom of the incline. A light string attached to the block runs over a frictionless pulley to a 60.0- suspended mass. The suspended mass is given...
*June 5, 2013 by Anonymous*

**algebra**

the weight of a body above the surface of earth varies inversely with the square of the distance from the center of the earth. if maria weighs 125 pounds when she is on the surface of the earth(3960 miles from the center),determine maria weight if she is at the top of mount ...
*October 22, 2013 by shae*

**algebra**

the weight of a body above the surface of earth varies inversely with the square of the distance from the center of the earth. if maria weighs 125 pounds when she is on the surface of the earth(3960 miles from the center),determine maria weight if she is at the top of mount ...
*October 22, 2013 by shae*

**Physics**

A 4-kilogram mass has a speed of 6 m/s on a horizontal frictionless surface. The mass collides head-on and elastically with an identical 4-kilogram mass initially at rest. The second 4-kilogram mass then collides head-on and sticks to a third 4-kilogram mass initially at rest...
*January 17, 2008 by Hannah*

**earth**

A 5.0-kilogram sphere, starting from rest, falls freely 22 meters in 3.0 seconds near the surface of a planet. Compared to the acceleration due to gravity near Earth’s surface, the acceleration due to gravity near the surface of the planet is approximately
*December 29, 2011 by Anonymous*

**physics**

A liquid is used to make a mercury-type barometer. The barometer is intended for spacefaring astronauts. At the surface of the earth, the column of liquid rises to a height of 2185 mm, but on the surface of Planet X, where the acceleration due to gravity is one-fourth of its ...
*November 13, 2007 by Jen*

**Forces w/ tension**

Assume that three blocks portrayed below move on a frictionless surface and that a 42 N force acts on the 3.0 kg block. Determine (a) the acecleration given the system, (b) the tension inthe cord connecting the 3.0kg and the 1.0 kg blocks, and (c) the force exerted by the 1....
*December 7, 2006 by Armando*

**COLLEGE PHYSICS**

A 62.0 kg skier is moving at 6.50 m/s on a frictionless, horizontal snow covered plateau when she encounters a rough patch 3.50 m long. The coefficient of kinetic friction between this patch and returning to friction-free snow, she skis down an icy, frictionless hill 2.50 m ...
*June 9, 2010 by Anonymous*

**Physics**

An object moving along a horizontal track collides with and compresses a light spring (which obeys Hooke's Law) located at the end of the track. The spring constant is 38.6 N/m, the mass of the object 0.270 kg and the speed of the object is 1.20 m/s immediately before the ...
*February 11, 2014 by Ryan*

**physics please help :/**

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 ...
*March 1, 2012 by Angel*

**physics**

A beam of light is incident on a flat piece of polystyrene at an angle of 55 degrees relative to a surface normal. What angle does the refracted ray make with the plane of surface? thank you
*February 25, 2009 by sam*

**CHEM.**

How does the surface tension of water compare with the surface tensions of most other liquids? a.)It is lower. b.)It is about the same. c.)It is higher. d.)It is higher when a surfactant is added. i think its C or D.
*January 30, 2012 by Lexi*

**physics**

How far (in meters) above the earth's surface will the acceleration of gravity be 27.0 % of what it is on the surface? can someone please just give me an equation to figure this out please I am lost
*March 13, 2012 by jessica*

**physics**

A block is pulled to the right across a alevel surface at a constant velocity of a horizontal force of 16 newtons. what is the coefficient of kinetic friction between the block and the surface?
*May 24, 2012 by Jen*

**Science**

What is the momentum of a 50 kg carton that slides at 2 m/s across an icy surface? The sliding carton skids onto a rough surface and stops in 3 s. Calculate the force of friction it encounters.
*February 26, 2013 by George*

**Physics**

On a cloudless day, the sunlight that reaches the surface of the earth has an intensity of about 1.2 103 W/m2. What is the electromagnetic energy contained in 6.4 m3 of space just above the earth's surface?
*October 28, 2013 by Sarah*

**ms.sue help!!! (math )**

hi im doing surface area I wondering how do you get the answer . this is the question Find the total surface area of a rectangular prism having dimension 1) 45cm by 30cm by 20cm
*February 3, 2014 by rian*

**physics**

Calculate the mass of Jupiter knowing that a person who weighs 490 N on the earth's surface would weight 1293 N on the surface of that planet. Jupiter has a radius of 7.15 × 107 m.
*June 5, 2014 by grey*

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