Thursday

October 23, 2014

October 23, 2014

Number of results: 67,906

**Physics**

One end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle, theta, with the stick. The coefficient of static friction between the end of the meter stick and the wall is 0.390. A. what is the maximum value...
*April 3, 2007 by Karla*

**phy.**

check my understanding please. Larry weighs 300 N at the surface of the earth. what is the weight of the earth in the gravitational field of Larry? -would it still be 300 N an astronaugt lands on a planet that has twice the mass as earth and twice the diameter. how does the ...
*October 16, 2007 by Julie*

**Physics - pls help**

A heavy conductor (mass m, length `, resistance R) is suspended by two springs each with spring constant k, and connected to a battery with electric potential V as shown in the figure. A magnetic field ~B is now imposed. The acceleration of gravity is 9.8 m/s2 . Which ...
*April 14, 2011 by cr*

**Physical Science**

I forgot to add this question into my other Physical Science Posts..sorry What is the difference between mass and weight? Mass is what an object contains inside. Weight is a measure of how strongly gravity pulls on that matter. [I got this from the internet but still need to ...
*March 18, 2009 by mysterychicken*

**Algebra: did I do this right**

find the other endpoint of a line segment with the given midpoint (6,4) endpoint ((3, 5). 6= 3/2 and 4 = 5/2 12=6 and 8 = 10 12-6 and 8 - (-10) End Point = (6, 18)
*June 8, 2010 by bb*

**chemistry (drbob222)**

[Ni(NH3)m(H2O)p]^2+ + mHCl ->mCl- + pH2O + Ni^2+ + mNH4^+ excess HCl + OH- -> H2O A .185 g sample of nickel salt was dissolved in 30.00 mL of 0.1013 N HCl. The excess HCl required 6.30 mL of 0.1262 N NaOH to reach the end point. Calculate the weight of the salt that ...
*October 4, 2009 by Anonymous*

**Physics**

A farsighted person has a near point (closest point they can see clearly) of 200 cm. What power and type of lens will correct this condition and allow the person to read a book at 25 cm?
*December 1, 2011 by Jake*

**Physics**

A high school cheerleader has a baton that is 1 meter long with a 100 gram mass on each end. Another cheerleader has a baton that is 0.5 meter long with the same mass on each end. Neglecting the mass of the rod holding the masses together, which baton will be easier to spin ...
*November 15, 2011 by Kevin*

**Physics - Pendulums**

A uniform circular disk whose radius R is 32.0 cm is suspended as a physical pendulum from a point on its rim. (a) What is its period of oscillation? __ s (b) At what radial distance r < R is there a point of suspension that gives the same period? __ cm in the book.. it ...
*April 12, 2007 by COFFEE*

**Calculus**

Sorry for posting another quesiton..; f(x) = { -7x^2 + 7x for x<=0 { 3x^2 + 7x for x>0 According to the definition of derivative, to compute f'(0), we need to compute the left-hand limit lim x-> 0− = _____ and the right-hand limit lim x->0+ ______ We ...
*February 23, 2011 by Cesar*

**physics**

where must a 1200n weight be hung on a uniform, 200N pole so that a boy at one end supports one-third as much as a man at the other end?
*October 7, 2013 by ghel*

**physics**

where must a 1200n weight be hung on a uniform, 200N pole so that a boy at one end supports one-third as much as a man at the other end?
*October 7, 2013 by ghel*

**reading anybody know?**

3. Which of the following words has a positive connotation? (1 point)childish immature babyish youthful 4. Which of the following sentences is punctuated correctly? (1 point)Is this your key, I found it near your house today? The wind blew the large, white, clouds across the ...
*December 14, 2012 by tesj*

**physics**

In Figure 12-6, a ladder of length L = 12 m and mass m = 46 kg leans against a slick (frictionless) wall. The ladder's upper end is at height h = 9.2 m above the pavement on which the lower end rests (the pavement is not frictionless). The ladder's center of mass is L/3 from ...
*December 29, 2010 by Sarah*

**English**

With your partner, talk about what is seen in the picture taking turns. Sentence A is an example sentence. Like Sentence A, make sentences looking at the picture. I see a cat is playing with a ball on her right hand. I see a lady who is watching TV lying on a sofa. She has put...
*March 28, 2010 by rfvv*

**Math**

The pressure on a scuba diver at sea level is 14.7 pounds per sq inch (psi). The pressure increases 0.445 psi for each foot of depth. Suppose the pressure on a diver is 41.4 psi. How deep is she? A spring is 2 in long with no weight suspended from it. For each ounce of weight...
*September 11, 2013 by Betsy*

**math**

1-show that 1-x/2 is the tangent line approximation to 1/ sqrt of 1+x near x=0 2-what is the local linearization of e^x^2 near x=1 3-find the tnagent line approximation of 1/x near x=1
*March 31, 2010 by piper*

**physics**

A mountain biker rides a given distance due north, then drives twice that far to the west. At the end of the trip the direct distance from the starting point is 112meters. What is the length of each leg of the trip and in which direction is the end point?
*January 12, 2014 by Lily*

**PHYSICS**

Suppose that the magnetic field in the figure below has a magnitude of 1.1 T, the rod has a length of 0.86 m, and the hand keeps the rod moving to the right at a constant speed of 3.4 m/s. If the current in the circuit is 0.044 A, what is the average power being delivered to ...
*March 14, 2013 by Andrea*

**Physics Urgent please help**

A spring of negligible mass, spring constant k = 82 N/m, and natural length l = 1.2 m is hanging vertically. This is shown in the left side where the spring is neither stretched nor compressed. In the central one, a block of mass M = 5 kg is attached to the free end. When ...
*October 15, 2013 by ss01*

**English**

12. What does the following quote reveal about Montressor’s intentions? "'Pass your hand,’ I said, ‘over the wall; you cannot help feeling the nitre. Indeed it is very damp. Once more let me implore you to return. No? Then I must positively leave you. But I must first render ...
*May 12, 2014 by Keith*

**Physics**

A mass m = 1.50 kg oscillates on an ideal,massless horizontal spring with a constant k = 73.5 N/m.The amplitude of oscillation is 10.0 cm.The system is frictionless. The positive x-direction is to the right. What is the mass's natural period of oscillation? At t = 0, the mass ...
*December 2, 2009 by Sandhya*

**Physics**

The rigid object shown in Fig. 10-63 consists of three balls and three connecting rods, with M = 1.5 kg, L = 0.67 m, and θ = 32°. The balls may be treated as particles, and the connecting rods have negligible mass. Determine the rotational kinetic energy of the object if ...
*July 28, 2010 by Anonymous*

**physics**

Describe the difference between the quantities, mass and weight. Give a description of two distinctly different ways in which object's weight can be altered.
*March 14, 2014 by Swastika*

**Physics**

A particle of mass m = 3.04kg is suspended from a fixed point by a light inextensible string of length = 1.11m. You are required to determine the relationship between the period of swing and the length of the pendulum. For small angle approximation, sin ¦È ¡Ö ¦È. Calculate the...
*April 6, 2012 by Anonymous*

**Physics**

A weight suspended from a spring is seen to bob up and down over a distance of 37 cm twice each second. What is frequency in units of Hz? What is the period in units of s.? What is the amplitude in units of cm?
*February 9, 2009 by Bob*

**physics urgent!**

A vaulter holds a 34.1 N pole in equilibrium by exerting an upward force U with her leading hand and a downward force D with her trailing hand. Point C is the center of gravity of the pole. Given d1 = 1.100 m, d2 = 1.65 m, and d3 = 2.75 m, what are the magnitudes of U and D? i...
*November 24, 2008 by tony*

**Physics**

The "karat" is a dimensionless unit that is used to indicate the proportion of gold in a gold-containing alloy. An alloy that is one karat gold contains a weight of pure gold that is one part in twenty-four. What is the volume of gold in a 20.0 karat gold necklace whose weight...
*April 5, 2007 by Mary*

**physics **

A particle vibrates in Simple Harmonic Motion with amplitude. What will be its displacement in one time-period if you attach a mass to the spring from its initial equilibrium position, it vibrates forever in simple harmonic motion. Why doesn't it come to rest after stretching ...
*February 26, 2011 by calous --- HELP PLEASEE!!!*

**physics**

"A one meter board with uniform density, hangs in static equilibrium from a rope with tension T. A weight hangs from the left end of the board 0.2m away in distance. What is the mass of the board"
*July 30, 2010 by jack*

**physics**

A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bottom of its path it is moving at a speed v = 2.3 m/s and the tension in the rope is T = 22.4 N. Now a peg is placed 4/5 of the way down the pendulum’...
*September 28, 2012 by hater of physics*

**math**

I am trying to find the coordinates of a point in a line. I have one end, and I have the midpoint. What formula should I use to find the one on the end? The one end is (8,4) and the MIDPOINT is (14, 7). What would I do to find the opposite point?! thanks!
*February 3, 2011 by Dawn*

**Physics**

A small block of mass m=1.9kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h=52.0m above the bottom of the loop of radius R=19.0m. What is the kinetic ennergy of the mass at the point A on the loop? What is the ...
*February 14, 2011 by Jean*

**Physics**

A small block of mass m=1.9kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h=52.0m above the bottom of the loop of radius R=19.0m. What is the kinetic ennergy of the mass at the point A on the loop? What is the ...
*February 14, 2011 by Jean*

**Physics - Hellp Really Stuck!**

1. A 0.20 kg object moves at a constant speed in a horizontal circular path of radius "r" while suspended from the top of a pole by a string of length 1.2 m. It makes an angle of 62 degrees with the horizontal. What is the speed of this object? 2. An object of mass 3 kg is ...
*December 11, 2010 by Jennifer*

**Physics**

Consider the conical pendulum, a mass on the end of a string, with the other end of the string fixed to the ceiling. Given the proper push, this pendulum can swing in a circle at an angle q of 25.5 with respect to the vertical, maintaining the same height throughout its motion...
*November 13, 2012 by Luke*

**Physics**

A pirate captain has asked you to help him engineer a new plank to have prisoners walk overboard from. He needs the plan to fall overboard with the prisoners in order not to leave any evidence behind. He has a uniform beam of length 8m and a mass of 100kg is resting on two ...
*May 2, 2014 by Michelle*

**Chemistry**

Okay, I have some confusion on a lab question for chemistry. The question was if you were preforming a microscale extraction of a 0.2 g of benzoic acid/fluorenone mixture (About 6 mL of dichloromethane and 2 mL of NaOH were added through out this experiment up until the final ...
*October 25, 2013 by ramire2*

**Mechanics & hydromechanics**

Where a 1208 N weight must be hung on a uniform 214 m pole so that a boy at one end supports one-third as much as a man at the other end.
*January 16, 2013 by joe*

**geometry**

there is a problem on my paper in which there is a right angle forming a triangle. the right angle is to the right end of the triangle. at the vertex at the end of the left side, those two lines go on to make two more angles. how do i figure out the degree of those angles. ex...
*January 22, 2008 by lizzie*

**physics**

Two blocks, each of mass m, are attached to the ends of a massless rod which pivots as shown in Figure 8-40. Initially the rod is held in the horizontal position and then released. Calculate the magnitude and direction of the net torque on this system. (Express your answer in ...
*November 10, 2009 by jenn*

**Physics - Charge on pith balls**

Two pith balls equally charged and each with a mass of 1.5. White one ball is suspended by a thread, the other is brought close to it and a state of equilibrium is reached. In that situation, the two balls are separated by 2.6cm and the thread attached to the suspended ball ...
*October 18, 2010 by Anonymous*

**Phy**

A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. the combined mass swings up to a height of 8.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision? Answer a. 0.394 kg·m/s b. 0.632 kg·m/s c. 6....
*March 19, 2014 by Jake*

**Physics**

A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. the combined mass swings up to a height of 8.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision? Answer a. 0.394 kg·m/s b. 0.632 kg·m/s c. 6....
*March 19, 2014 by Jake*

**physics**

You overindulged on a delicious dessert, so you plan to work off the extra calories at the gym. To accomplish this, you decide to do a series of arm raises holding a 5.5kg weight in one hand. The distance from your elbow to the weight is 36cm , and in each arm raise you start ...
*October 4, 2014 by dia*

**physics**

A small block of mass m = 1.1 kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h = 56.0 m above the bottom of the loop of radius R = 17.0 m. What is the kinetic energy of the mass at the point A on the loop? What is...
*March 11, 2012 by Katie*

**physics**

A small block of mass m = 1.1 kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h = 56.0 m above the bottom of the loop of radius R = 17.0 m. What is the kinetic energy of the mass at the point A on the loop? What is...
*March 11, 2012 by Katie*

**Physics**

A small block of mass m = 1.3 kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h = 54.0 m above the bottom of the loop of radius R = 19.0 m. What is the kinetic energy of the mass at the point A on the loop? What is...
*December 24, 2013 by Daniel*

**statistics**

For a normal distribution, identify the z-score location that would separate the distribution into sections so that there is: a)60% in the body on the right-hand side b)90% in the body on the left-hand side
*February 29, 2008 by Anonymous*

**Physics**

Find the center of mass of a rectangular plate of length 28.6cm and width 14.3cm . The mass density varies linearly along the length. At one end, it is 6.79g/cm^2,at the other end, it is 35.3g/cm^2 Show steps and explanation in X and Y
*October 18, 2013 by Vinh*

**physics**

An astronaut weighs 696 N on the Earth. What is her weight on planet X, which has a radius Rx = Rearth 1.60 and a mass Mx = Mearth 8.60? -the only equation I know for weight is "w = m x g"...I don't know how to solve for w using force.
*January 13, 2008 by Courtney*

**Chemistry **

Hey guys I did a lab and I have to answer the questions relating to the lab. I did question can someone please check if these are accurate 1. Calculation to Determine the molecular weight of unknown substance Mass of unknown used: 2.0232 g Mass of water used: 50.0 g (0.05kg) ...
*February 3, 2010 by Saira*

**Math**

determine the length of the sides and the measures of the angles for the congruent quadrilaterals B'C' (On the picture it shows 50 degrees for B'C'(which is on the left hand side) and 9 for D'A' (On the right hand side)the picture shows that it is upside down.)
*May 6, 2011 by Geena*

**stoichiometrics**

What is the mass of each and which is greater? 1g H2 + ?N2 and 1g H2 + ?O2 I've balanced them to this point: 3H2 + N2 ===> 2NH3 2H2 + O2 ===> 2H2O Help please, I am stuck on this step and cannot get any further. Thanks, PJ Good! You've done the hard part. For the first ...
*October 22, 2006 by Penny*

**physics**

a bead on a wire 30m high is released and reaches point A, where is loops twice towards the right. what is the velocity and acceleration at point A-D? point A is at 20m directly below from starting point. Point B is 10m at the bottom of the first loop. point C is in between ...
*February 8, 2014 by christopher *

**simple PHYSICS!**

The combination of the force of gravity and my hand provide a net force of 40 N on a ball straight up. The ball accelerates at 100 m/s^2 while it is in my hand. What is the mass of the ball in kg?
*March 20, 2013 by please..anyone help!!*

**Physics**

A spring with a force constant 0f 2.50 kN/M is set upright, and a wood platform of negligible weight is fastened to its upper end. A 2.50 kg mass is gently placed on the platform and released. How far does the spring compress? What is the final equilibrium position?
*June 10, 2014 by Anonymous*

**Physics**

A spring with a force constant 0f 2.50 kN/M is set upright, and a wood platform of negligible weight is fastened to its upper end. A 2.50 kg mass is gently placed on the platform and released. How far does the spring compress? What is the final equilibrium position?
*June 10, 2014 by Anonymous*

**chemistry**

The phosphorus in a completely dried fertilizer sample weighing 0.4498 grams was precipitated as MgNH4PO4*6H2O. The precipitate weight was determined to be 236.8 mg and ignited to Mg2P2O7. The weight of the ignited precipitate was 268.9 mg. Calculate the percent phosphorus. My...
*August 31, 2007 by smiley*

**Physics 203**

A block with mass of 5.0kg is suspended from an ideal spring having negligible mass and stretches the spring 0.20m to its equilibrium position. A) What is the force constant of the spring? B) The spring is then stretched 0.80m from its equilibrium position and then released ...
*April 9, 2013 by ash*

**physics**

One end of a wire is attached to a ceiling, and a solid brass ball is tied to the lower end. The tension in the wire is 160 N. What is the radius of the brass ball? Well, the tension is from the brass ball, and you are given the weight as 160N. Weight=densitybrass*g*(volume) ...
*June 1, 2007 by meredith*

**physics**

Felicia, the ballet dancer, has a mass of 45.0 kg. a.) What is Felicia's weight on Earth? b.) What is Felicia's mass o Jupiter, where the acceleration due to gravity is 25.0 m/s2? c.) What is Felicia's weight on Jupiter?
*November 30, 2010 by Jay*

**physics**

The combination of the force of gravity and my hand provide a net force of 40 N on a ball straight up. The ball accelerates at 100 m/s2 while it is in my hand. What is the mass of the ball in kg?
*March 18, 2013 by ayan*

**physx!!!!**

The combination of the force of gravity and my hand provide a net force of 40 N on a ball straight up. The ball accelerates at 100 m/s^2 while it is in my hand. What is the mass of the ball in kg?
*March 18, 2013 by please..anyone help!!*

**physics**

the three weights are hanging in static equilibrium. The two weights left and right of center have a mass of 100 Kg. The weight in the center has a mass of 100 Kg. Treat the strings as massless and the pulleys as frictionless. If the sin of the angle theta in the figure is sin...
*January 12, 2012 by frank*

**Math: Calculus**

The equation: 10(x-1)(x-2)(x-3)=1, has three real solutions a<b<c where a=____, b=___ , and c=___. Enter your answers with at least six correct digits beyond the decimal point. Hint: Ask what the solutions are if the right hand side is 0 instead of 1, and use Newton's ...
*November 4, 2010 by REALLY NEED HELP!!!!*

**physics**

When one end of a bar magnet is placed near a tv screen, the picture becomes distorted. Why?
*September 3, 2011 by KAIT*

**physics please helpp **

Find the minimum diameter of a 51.5-m-long nylon string that will stretch no more than 1.01 cm when a load of 68.9 kg is suspended from its lower end. Assume that Ynylon = 3.51·108 N/m2
*October 25, 2011 by melisa*

**PHYSICS**

A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. The combined mass swings up to a height of 10.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision? The Ans is 0.707 kg m/sec I do not know how ...
*October 31, 2012 by MIKE*

**Geometry**

1. Twyla's pet cat weighs 8lb. Her pet hamster weighs 12 ounces. What is the ratio of her cat's weight to her hamster's weight? 2. The non-right angles of a right triangle are in the ratio 1:5. Write the equation that could be used to find the measure of each angle.
*October 6, 2013 by Chelsey*

**Algebra3!!!!**

How would you would graph the linear equation y = -2x + 6? First plot the point (6,0) and then count up two and to the right 1. First plot the point (6,0) and then count down two and to the right 1 First plot the point (0,6) and then count up two and to the right 1 First plot ...
*October 14, 2006 by Margie*

**science**

Technician A and Technician B are examining the same substance. Technician A records the mass, volume, and weight of the substance and decides that it is sugar. Technician B records the melting point, density, and boiling point of the substance and decides that it is salt. ...
*September 27, 2009 by jane*

**Physics**

Three very small spheres are located along a straight line in space far away from everything else. The first one (with a mass of 2.43 kg) is at a point between the other two, 10.60 cm to the right of the second one (with a mass of 5.17 kg), and 20.70 cm to the left of the ...
*December 15, 2007 by Lindsay*

**physics**

The density of an unspecified material is 3.27 g/cm (cubed) . if the mass of a block of this material is 10.9kg, what is the volume of the block in cubic meters? A Wooden block is pulled to the right across a level surface at a constant velocity by a force of 47 Newtons, the ...
*May 24, 2012 by Jen*

**Physics**

A box of mass 1kg is placed on a table and is connected to a hanging mass m by a string strung over a pulley. If the coefficient of kinetic friction between the box and the table is .3 and the box slides at a constant speed of .5m/s what is the weight of the hanging mass? to ...
*November 14, 2007 by Andrea*

**HELP! Statistics**

Which of the following statements about the margin of error is false? 1. Statisticians routinely construct interval estimates by making their point estimate the interval center and creating a range of other possible values, known as the margin of error, below and above the ...
*November 24, 2010 by Felicia*

**physics**

A uniform plank weighing 50N and 12m long is pivoted at a point of 4m from one end.A boy weighing 30N sits on the plank 7m from pivot.Where must his elder brother whose weight is 80N sit to balance the plank horizontally
*May 29, 2013 by Anonymous*

**Physics**

A uniform plank weighing 50N and 12m long is pivoted at a point of 4m from one end.A boy weighing 30N sits on a plank 7m from pivot.where must his elder brother whose weight is 80N sit to balance the plank horizontally
*May 29, 2013 by Anonymous*

**physics**

A block of mass m1 = 2.4 kg slides along a frictionless table with a speed of 8 m/s. Directly in front of it, and moving in the same direction, is a block of mass m2 = 5.0 kg moving at 2.8 m/s. A massless spring with spring constant k = 1140 N/m is attached to the near side of...
*October 17, 2014 by steven*

**physics**

A patient has a far point of 29.2 cm and a near point of 24.2 cm. What power (in diopters) should be prescribed to correct the patient's vision using: (b) glasses which are worn 0.5 cm away from the patient's eyes?
*February 7, 2013 by m*

**Physics**

A thin rod, of length L and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m is attached to the other end. The rod is pulled aside through an angle and released. What is the speed of the ball at the lowest point if L = 2.20 m...
*March 9, 2007 by Technoboi11*

**Physics**

A skateboarder shoots off a ramp with a velocity of 6.7 m/s, directed at an angle of 53° above the horizontal. The end of the ramp is 1.0 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point on ...
*October 5, 2011 by Sam*

**Physics**

A certain spring has a spring constant of 165 N/m. A 20kg mass is attached to the end of the spring. While the mass is at the equilibrium position, it is given a velocity of 8m/s downward. What is the total energy of the system, and aacceleration of the system when it is at ...
*November 19, 2012 by Philip*

**Physics**

A spring hanging from the ceiling has an unstretched length of 80 cm. A mass is then suspended at rest from the spring causing its length to increase to 89 cm. The mass is pulled down an additional 8 cm and released. What is the amplitude of the resulting oscillation?
*April 17, 2012 by Anonymous*

**Physics**

A spring hanging from the ceiling has an unstretched length of 80 cm. A mass is then suspended at rest from the spring causing its length to increase to 89 cm. The mass is pulled down an additional 8 cm and released. What is the amplitude of the resulting oscillation?
*April 17, 2012 by Anonymous*

**biomechanics**

When a weight-lifter lifts a weight equal to his upper body weight his trunk makes an angle of 40 degrees, with the vertical, as shown in the diagram below. In this position the erector spinae muscles exert a large force on the sacrum at an angle of 40 degree to the vertical ...
*December 12, 2012 by dmkp*

**physica**

If a certain spring stretches 4.32221 cm when a load of 15.3617 N is suspended from it, how much will the spring stretch if it is cut in half and 18.2451 N is suspended from it?
*February 19, 2013 by keisha*

**physics**

A mass sitting on a horizontal, frictionless surface is attached to one end of a spring; the other end is fixed to a wall. 8.0 J of work is required to compress the spring by 0.17 m. If the mass is released from rest with the spring compressed, it experiences a maximum ...
*December 6, 2009 by Anonymous*

**Physics**

A mass sitting on a horizontal, frictionless surface is attached to one end of a spring; the other end is fixed to a wall. 3.0 J of work is required to compress the spring by 0.17 m. If the mass is released from rest with the spring compressed, it experiences a maximum ...
*January 8, 2010 by BJ*

**physics**

Two identical small insulating balls are suspended by separate 0.17 m threads that are attached to a common point on the ceiling. Each ball has a mass of 7.40 10-4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive charges and...
*February 27, 2014 by Jen*

**Physics**

Two long parallel wires separated by a distance, d, carry currents in opposite directions. If the left-hand wire carries a current i/2, and the right-hand wires carries a current i, determine where the magnetic field is zero.
*October 20, 2011 by Jessica*

**science**

2. A thin rod of length 10m is in the x-y plane parallel to the x axis. Its centre is at the point (3,2) .A force of 100 N in the x-y plane is applied at its right end at an angle of 30o from the x-axis. An equal and opposite force is applied at its other end. (i) Make a ...
*August 29, 2010 by sant*

**English **

5. Which of the following sentences from the article is an example of hyperbole? (1 point) A.They had proved something amazing: Ivory-billed woodpeckers still graced the planet. B. According to experts, they need large areas of old-growth forest, including many big, dead ...
*March 21, 2013 by Bunny *

**Physics**

A rock of mass 0.086 kg is thrown upward with an initial speed of 13 m/s. Find the work done by gravity on the rock from the time it leaves the thrower's hand until it reaches the highest point on its trajectory. Hint: You do not have to calculate the rock's maximum height.
*July 11, 2012 by Sierra*

**Potential Energy Q**

Q A rollercoaster of mass 400 kg is stationary at the highest point on the track. It then drops to the lowest point through a vertical distance of 24 m. Calculate: a) the potential energy of the car at the top of the ride. b) the speed of the car at its lowest point, ignoring ...
*January 21, 2007 by Jim (BIGEYE)*

**physics**

a small mass is suspended from along thread so as to form a simple pendulum.the period T of the oxillation depend on the mass M,the length L of the thread and the acceleration G of free fall at the place concerned so that T =km^x,L^y,G^z where K = 2pie 1. Find the values of x,...
*October 5, 2013 by praise*

**Physics**

A 160 N block rest on a table attached to a string and pulley. The suspended mass over the side of the table has a weight of 53 N. PART 1: What is the magnitude of the minimum force of static friction required to hold both blocks at rest? Answer in units of N. PART 2: What ...
*October 3, 2010 by Elizabeth*

**Physics**

A uniform rod of mass M and length d is initially at rest on a horizontal and frictionless table contained in the xy plane, the plane of the screen. The figure is a top view, gravity points into the screen. The rod is free to rotate about an axis perpendicular to the plane and...
*January 10, 2014 by Anonymous*

**Science..physics**

The moon is the Earth's nearest neighbour in space. The radius of the moon is approximately one quarter of the Earth's radius, and its mass is one eightieth of the Earth's mass. a) Culculate the weight of a man with a mass of 80kg on the surface of the moon. b) Culculate the ...
*April 24, 2013 by Melyn*

**physics**

A new type of spring is found where the spring force F is given by F=-kx + bx^2 where k=400 N/ m and b=100 N/m^2 and x is the expansion (or compression) of the spring from its equilibrium position. The spring is attached to a point mass of 1 kg sitting on a horizontal ...
*April 4, 2011 by Physics*

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