Friday

August 29, 2014

August 29, 2014

Number of results: 27,655

**Chemistry**

A gas mixture with a total pressure of 750 mmHg contains each of the following gases at the indicated partial pressures: , 265 mmHg; Ar 134 mmHg; and ,O2 157 mmHg; The mixture also contains helium gas.
*November 9, 2010 by Lisa*

**Physics**

Trying to beat the heat of summer, a physics grad student went to the local toy store and purchased a child's plastic swimming pool. Upon returning home, he filled it with 154 liters of water at 25C. Realizing that the water would probably not be cool enough, he threw ice ...
*November 20, 2010 by BG*

**physics**

It is possible to shoot an arrow at a speed as high as 80 m/s. If friction is neglected, how high would an arrow launched at this speed rise if shot straight up? How long would the arrow be in the air?
*September 18, 2008 by mb*

**physical science**

Green light has a frequency of about 5.3Hz~10Green light has a frequency of about 5.3Hz~ 10^{14}. Using the relationship speed of light (c)=f find its wavelength in air.
*March 17, 2014 by ashley*

**Chemistry**

Calculate the height, in feet, of a column of water that would exert the same pressure as a column of mercury that is 754 mm high. (The density of mercury is 13.6 g/cm3 and the density of water is 100 g/cm3.)
*June 14, 2009 by Zandria*

**Math-probability**

The theoretical probability of undesirable side effects resulting from taking Grebex is 2 in 19. If 380 people take Grebex to lower their blood pressure, how many will encounter undesirable side effects?
*July 19, 2011 by Jen*

**Chemistry**

M2CO3 ( M is a metal) 5,22 g dissolved in H2O and reacted with HCl CO3(-2) (aq) + 2H+ (aq) --> CO2 (g) + H2O (l) CO2 produced and collecting over H2O . 2.0L at 25 C P= 475 mmHg Vapour pressure of H2O at 25 C = 23,8 mmHg Then Which metal is M ?
*October 8, 2012 by Which metal?*

**Chem 151**

The atmosphere in a sealed diving bell contained oxygen and helium. If the gas mixture has 0.200 atm of oxygen and a total pressure of 3.00 atm, calculate the mass of helium in 10.0 L of the gas mixture at 40 degrees Celsius.
*March 21, 2013 by Double checking ans*

**physics**

A ceiling fan has four blades, each with a mass of 0.40 kg and a length of 65 cm. Model each blade as a rod connected to the fan axle at one end. When the fan is turned on, it takes 4.45 s for the fan to reach its final angular speed of 2.3 rev/s. What torque was applied to ...
*August 2, 2011 by Ashley*

**Health and Safety Workplace**

1. What's the vital sign that's described according to rate, depth, and rhythm? A. pulse B. respiration C. blood pressure D. temperature (MY ANSWER IS B) 2. Airborne infections may be contracted in all the following ways except A. by coughing B. through insect stings C. by ...
*October 4, 2013 by Shamie *

**chemistry 106**

Methanol, ethanol, and n-propanol are three common alcohols. When 1.00 g of each of these alcohols is burned in air, heat is liberated. Calculate the heats of combustion of these alcohols in kJ/mol. (a) methanol (CH3OH), -22.6 kJ (b) ethanol (C2H5OH), -29.7 kJ (c) n-propanol (...
*March 3, 2010 by Tanisha *

**math **

In a storm, a plane flew against the wind and took 9 hours to cover 3,600 miles. The return trip, traveling with the wind, took 1 hour less. find the air speed of the plane, and the speed of the wind.
*April 4, 2011 by zack*

**physics**

A balloonist drops an apple weighing 1.5 N over the side of the balloon's gondola. As it falls and increases speed, the drag force from the air upward on it increases. When the upward force is 0.7 N, what is the direction and magnitude of the net force on the apple?
*October 25, 2012 by anon*

**Physics**

Helium balloons are used regularly in scientific research. A typical balloon would reach an altitude of 40.0 km with an air density of 4.3*10^-3 kg/m^3. At this altitude the helium in the balloon would expand to 540000.0m^3. Find the buoyant force on the balloon.
*December 24, 2013 by Hil*

**physics**

A light wave has a 670 nm wavelength in air. Its wavelength in a transparent solid is 376 nm. (a) What is the speed of light in this solid? (b) What is the light's frequency in the solid?
*February 22, 2010 by anonymous*

**English**

1. I had poor eye sight, so I had to go to an eye hospital. I had my eyes examined by an eye specialist. 2. I had bad hearing, so I had to go to see an ear, nose, and throat specialist to have my ears examined. 3. I had some hearing problems, so I had to go to a otolaryngology...
*June 16, 2009 by John*

**Scie**

Which property is the same for each piece of broken up rock. A. Size B. mass C. Volume D. Melting Point The only intrinsic (look that word up)property is d. D. melting piont
*April 16, 2007 by Missy*

**chem**

a solution of weak acid of molarity 0.05 mol/dm3 is titrated against 0.1mol/dm3 NaOH, the pka = 3.67 what volume of acid would u use in ur titration?
*December 7, 2008 by Kimora*

**Physics**

There is an electric field in a certain region that is defined as E=axihat, a is N/C and x is defined by the position in meters. What is the volume charge density in the region. So far I did 32p=(32)(8.85*10^-12) I got 3.54*10^-10, where did I go wrong?
*August 20, 2009 by Sammy*

**physics**

three spheres have the same volume and all float in water. Spheres A, B, and C have masses of 25g, 30g, and 35g. Which sphere floats the highest.
*June 25, 2010 by mike*

**Calculus 2b**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=x^2 x=y^2 about the axis x=3 ? Having Trouble please help!!
*August 17, 2010 by Mary*

**algebra**

The diagram shows a cologne bottle that consists of a cylindrical base and a hemispherical top. write an expression for cylinders volume and hemispherical top. h= 10cm; r=5cm
*August 30, 2010 by Anonymous*

**calculus**

A right triangle of hypotenuse L is rotated about one of its legs to generate a right circular cone find the largest volume that such a cone could occupy
*January 7, 2011 by anu*

**calculus**

A right triangle of hypotenuse L is rotated about one of its legs to generate a right circular cone find the largest volume that such a cone could occupy
*January 7, 2011 by anu*

**Chemistry**

If 0.630 grams of HNO3 (molecular weight 63.0) are placed in 1 liter of distilled water at 25 degrees C, what will be the pH of the solution? (Assume that the volume of the solution is unchanged by the addition of the HNO3.) A. 0.01 B. 0.1 C. 1 D. 2 E. 3
*January 24, 2011 by Sharon*

**Chemistry**

An irregular shaped stone was lowered intro a graduated cylinder holding a volume of water equal to 2.0 ml. The height of the water rose to 7.0 ml. If the mass of the stone was 25 g, what was the density
*September 1, 2011 by Monique*

**AP Chemistry**

What volume of 0.149 M K3PO4 is required to react with 41 mL of 0.793 M MgCl2 according to the equation 2 K3PO4 + 3 MgCl2 → Mg3(PO4)2 + 6 KCl Answer in units of m
*October 7, 2011 by Yolanda*

**chemistry**

what volume would a gas occupy, if you had a 37.L cyliner that was 45 atm and temperature of 18C was released to the atmosphere (P=760.mm Hg) which had a temperature of 37C? Can you show me how to set this up?
*October 16, 2011 by dominique*

**Science**

The fly food recipe requires that the final solution contain 1.5% agar. If the final volume is 800ml, how much agar will you need? I get 12ml, does that seem right?
*November 24, 2011 by Anonymous*

**Math**

Right ∆ABC has vertices at A(−5, 0), B(0, 0) and C(0,12). What is the volume of the solid figure formed when ∆ABC is rotated about side BC? Express your answer in terms of .
*January 30, 2012 by Kentucky*

**chemistry**

Why do the concentrations of Pb 2+ and SO4 2- ions in a saturated solution of PbSO4 in contact with solid PbSO4 remain the same when the solution evaporates to half of its original volume? it has to do with equilibrium.
*March 28, 2012 by alex*

**Chemistry**

calculate the ph of a solution that results from titrating 0.0500 moles of cyanic acid to the equivalence point with an equal number of moles of OH-, if the final volume of the solution is 150 ml ka= 3.50 * 10^-4
*April 6, 2012 by Tasneem*

**math**

The Great Pyramid of Cheops has a square base of 771 ft on a side and a height of 486 ft. How many rooms 25 ft x 20 ft x 8 ft would be needed to have a volume equivalent to that of the Great Pyramids?
*April 12, 2012 by Amy*

**geometry**

A tetrahedron is a triangular pyramid in which each face is an equilateral triangle. Calculate the volume of a tetrahedron that has all its edges 6 cm in length. Hint: You will need to know some geometry and trigonometry.
*May 15, 2012 by Lucas*

**math**

the volume of a rectangular solid is given by expressions given below.in each case find the dimentions of the solid. a)6x^3+5x^2-6x. b)15x^2-51x+18. c)x^3+13x^2+32x+20. d)x^2-5x/2-3/2. e)x^3-9x. f)x^4+x^3-x-1 plz everyon help me
*May 29, 2012 by parul*

**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.*

**Math**

Find the volume generated if the region bounded by y = sin 2x and y = cos x, π/6 ≤ x ≤ π/2 is revolved about the line y = 2. Use the method of washers.
*January 27, 2013 by Em*

**chemistry**

sodium metal dissolves im liquid mercury to form of NA(s) and Hg(l) are 0.97 g/ml and 13.6 g/ml respectively. a sodium amalgoum is made by dissolving 10 ml Na (s) in 20.0 ml Hg (l). The final volume of solution is 21.0 ml. Calculate the molarity of Na in the solution.
*January 31, 2013 by masharat*

**Chemistry**

59.0 mL of a 1.80 M solution is diluted to a total volume of 268 mL. A 134-mL portion of that solution is diluted by adding 171 mL of water. What is the final concentration? Assume the volumes are additive.
*March 19, 2013 by Robert*

**chemistry**

53.0 mL of a 1.50 M solution is diluted to a total volume of 258 mL. A 129-mL portion of that solution is diluted by adding 195 mL of water. What is the final concentration? Assume the volumes are additive.
*March 26, 2013 by Jen*

**Chemistry**

a chemist carries out the reaction of 0.250 mol of f2 with excess of cl2. At 250 degress C and 1.00 atm, what is the maximum volume of CLF3 in liters that the reaction can produce?
*March 27, 2013 by Emilee *

**Chemistry**

Determine the volume of methane CH4 gas needed to react completely with 0.660 L of 02 to form methanol CH3OH I'm confused because I'm sure CH4 + O2 don't give you CH3OH. Thanks
*March 29, 2013 by Shadow*

**chemistry**

59.0 mL of a 1.40 M solution is diluted to a total volume of 278 mL. A 139-mL portion of that solution is diluted by adding 129 mL of water. What is the final concentration? Assume the volumes are additive.
*April 17, 2013 by lee*

**Chemistry **

77.0 mL of a 1.20 M solution is diluted to a total volume of 288 mL. A 144-mL portion of that solution is diluted by adding 155 mL of water. What is the final concentration? Assume the volumes are additive.
*May 10, 2013 by Gmp*

**Chemistry**

What volume of 0.123 M NaOH(aq) must be added to 125 mL of 0.197 M H2SO3(aq) to reach the following points? (a) the first stoichiometric point (b) the second stoichiometric point
*June 14, 2013 by Sara*

**Chemistry**

What volume of 0.123 M NaOH(aq) must be added to 125 mL of 0.197 M H2SO3(aq) to reach the following points? (a) the first stoichiometric point (b) the second stoichiometric point
*June 14, 2013 by Sara*

**chemistry**

A buffer solution is prepared by mixing 99.0 mL of 0.450 M HF and 55.0 mL of 1.15 M NaF. Determine the pH of the solution after the addition of 0.01 moles NaOH (assume there is no change in volume when the NaOH is added).
*March 1, 2014 by Hayla*

**Chemistry **

What volume in liters of C3H7Cl is produced if 400.0g of C3H8 (propane) reacts with excess chlorine gas according to the equation C3H8+ Cl2 --> C3H7Cl+HCl
*April 15, 2014 by Megan*

**Math**

A specialty cooking oil is packaged in a bottle that is a triangular prism. The base of the bottle is 2.2 in. Wide and 2.4 in. High; the bottle is 6 in. Tall. The glass is 0.2 in. Thick. What is the interior volume of the bottle? Thank you
*April 24, 2014 by Mom B*

**Math**

A swimming pool is to be constructed with a condition that its length must be twice its width. If the width of the pool is 2x+2 and its volume is 216 meter squared when its 2 meters deep. What is its dimensions?
*July 12, 2014 by Jonel*

**physics**

A car drives straight off the edge of a cliff that is 47m hight. The police at the accident note that the point of impact is 122m from the base of the cliff. How fast was the car traveling when it went over the cliff. Calculate the time in air: that is the time to fall47 m. ...
*February 1, 2007 by leann*

**physics**

A 67.7 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.04 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This ...
*February 19, 2012 by Harry*

**physics**

A 67.7 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.04 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This ...
*February 20, 2012 by Joe*

**chemistry**

To what volume should you dilute 131 mL of an 8.20 M CuCl2 solution so that 49.0 mL of the diluted solution contains 4.53g CuCl2 ? Chemistry...Help!! - Dr Russ, Wednesday, December 8, 2010 at 4:43am Molar mass of CuCl2 is 134.5 g mol^-1 so solution needs to contain 4.53 g / ...
*December 8, 2010 by Lisa, Help needed!*

**physics**

Assume acceleration due to gravity=10 m/s. A ball is thrown vertically upward from top of a building with speed of 20 m/s. On the way back ball misses the building and lands on the ground. Total time the ball is in air is 6 seconds. Determine the height of the building with ...
*February 14, 2011 by Mark*

**Please Help!!!!!!**

a hot air balloon is rising vertically 10 ft/sec while the wind is blowing horizontally 5ft/sec. Find the speed of the balloon and the angle x that it makes with the horizontal. I know that the speed of the balloon is the square root of (10)^2 + (5)^2, but I was wondering if ...
*November 10, 2011 by Ashley*

**calculus**

A hot air balloon rising straight up form a level field is tracked by a range finder 500ft from the liftoff point. At the moment the range finders elevation ange is pi/4, the angle is increasing at 0.14 rad/min. How fast is the balloon rising at that moment?
*October 17, 2010 by Denzel*

**phisics**

a rock is tossed straight up with a speed of 30m/s. when it returns it falls into a hole 10m deep. what is the rocks velocity as it hits the bottom of the whole? how long would the rock in the air, form the instant it is released until it hits the bottom on the hole
*August 30, 2012 by nicolas*

**physics**

A ball is thrown straight downward from the surface of the moon. Is the maximum height it reaches less than, equal to, or greater than the maximum height reached by a ball thrown upwards on the earth with the same initial speed? Ignore air resistance in both cases
*September 23, 2012 by tiffany*

**Physics- Please Help, soooo lost!**

Two pipes of equal length are each open at one end. Each has a fundamental frequency of 715 Hz at 300 K. In one pipe the air temperature is increased to 313 K. If the two pipes are sounded together, what beat frequency results?
*December 4, 2012 by Mary*

**Physics**

A projectile is fired vertically from Earth's surface with an initial speed v0. Neglecting air drag, how far above the surface of Earth will it go? (Use any variable or symbol stated above along with the following as necessary: ME for the mass of the Earth, rE for the radius ...
*April 11, 2013 by Rachel*

**physics**

A rocket accelerates straight up from rest for 20 seconds with an acceleration of 8 m/s2. After 20 seconds the rocket motor shuts off and the rocket continues to coast upwards. How high does the rocket go in meters? Details and assumptions You may take the acceleration of ...
*June 15, 2013 by urgent answer needed*

**Algebra**

A toy rocket that is shot in the air with an upward velocity of 48 feet per second can be modeled by the function f(t)=-16t^2+48t , where t is the time in seconds since the rocket was shot and f(t) is the rockets height. What is the maximum height the rocket reaches? 16ft ...
*July 7, 2014 by alex*

**science**

what volume of helium would be in a balloon the size of a bottle. I answered your question below. Also, you should use the same name. It helps us keep questions straight. b + 2 = i am dum u didn't answer my queshtion how do i convert ton to pounds
*January 31, 2007 by radicalred*

**Chemistry **

Determine the volume (in mL) of 0.844 M hydrochloric acid (HCl) that must be added to 38.0 mL of 0.650 M sodium hydrogen phosphate (Na2HPO4) to yield a pH of 6.92. Assume the 5% approximation is valid and report your answer to 3 significant figures. Look up pKa values.
*March 9, 2011 by Colin*

**Calculus**

Find the volume of the solid by rotating the region bounded by the given curves about the x-axis. Use the method of cylindrical shells. y=4x^2 2x+y=6 I drew the picture and the intersection points are at x=-1.5 and x=1. I'm not sure how to identify the "shell" with this ...
*February 8, 2012 by Anonymous*

**math**

Find the volume of the solid generated by revolving the curves y=x^2+1 & y=x+3. after finding the intersection, x= 2 & x=-1 can someone show me how to integrate this funct. with simplest steps(i mean do not use substitution formula). if im x miataken the ans is 117/5 pie unit^3
*December 21, 2012 by ifi*

**Chemistry**

Consider 54.0 mL of a solution of weak acid HA (Ka = 1.00 10-6), which has a pH of 4.200. What volume of water must be added to make the pH = 5.500? I found HA for both and then I used C1V1 = C2V2 plugging in the concentrations of HA in C1 and C2 and 0.054 for V1, but I'm ...
*February 11, 2013 by Ter*

**physics**

The angle of incidence of light passing from air to a liquid is 38 degrees.The angle of refraction is 24.5 degrees. What is the index of refraction of the liquid
*April 11, 2012 by ******tasha*******

**science**

a)Calculate the mass percent of carbon in the hydrated form of the solid that has the formula BeC2O4 loosly bonded to 3H2O. b)When heated to 220degrees C, BeC2O4loosly bonded to 3H2O(s) dehydrates completely as represented below: BeC2O4loosely bonded to 3H2O ==> BeC2O4 + ...
*January 4, 2007 by michelle*

**math**

frank tosses a baseball card into the air. the card lands face up 30 out of 50 times. how many times can you expect the card to land face up in the next 75 tosses?
*January 24, 2012 by moses*

**algebra**

You throw a tennis ball up in the air from an initial height of 4 feet and an initial velocity of 36 feet per second. Will the ball reach a height of 30 feet? If so, how long will it take?
*March 31, 2013 by Haiti*

**algebra**

If the global climate were to warm significantly as a result of the greenhouse effect or other climatic change, the Arctic ice cap would start to melt. This ice cap contains the equivalent of some 680,000 cubic miles of water. More than 200 million people live on land that is ...
*July 1, 2011 by Anonymous*

**Physics**

A hot air balloon has just lifted off and is rising at the constant rate of 2.2 m/s. Suddenly one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 11.6 m/s. If the passenger is 2.5 m ...
*September 16, 2008 by nick*

**physics**

A hot-air balloon has just lifted off and is rising at the constant rate of 1.51 m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 13.00 m/s. If the passenger is 2.68...
*September 8, 2012 by Nathan*

**physics**

A hot-air balloon has just lifted off and is rising at the constant rate of 1.51 m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 13.00 m/s. If the passenger is 2.68...
*September 8, 2012 by Nathan*

**physics**

a student drops an object out the window of the top floor of a high-rise dormitory a) neglecting air resistance, how fast is the object traveling when it strikes the ground at the end of 3.0 s? express the speed in mi/h for a familiar comparison, b) how far, in meters, does ...
*March 30, 2014 by Katie*

**Chemistry**

What effect would be on the normality of unknown acid? Explain why. a) if NaOH solution is pipetted into a conical flask containing some distilled water b) if an air bubble is out from the burette c) if too much acid is ran out during both titrations although the volumes of ...
*May 15, 2014 by Peter M.Shaker*

**Physics**

The mass of a sports car is 1200 kg. The shape of the car is such that the aerodynamic drag coefficient is 0.250 and the frontal area is 2.30 m2. Neglecting all other sources of friction, calculate the initial acceleration of the car ,if it has been traveling at 80 km/h and is...
*February 24, 2011 by Jamie*

**helllllllllllllllppppppppppppp**

need help math I have a big square of 9little squares in it on the first row going down I got 1 4 6 that makes 11 ok I have to make 11 using those number on the other squares and I can not double the same number in every way it has to come out 11 straght ,down,side, across ...
*August 31, 2005 by sally*

**physics**

It is possible to shoot an arrow at a speed as high as 100 m/s. (a) If friction is neglected, how high would an arrow launched at this speed rise if shot straight up? (b) How long would the arrow be in the air? Please help! I do not have any clue as to how to solve. Thanks!
*June 7, 2010 by sarah*

**Physics**

You shoot an arrow into the air. Two seconds later (2.00 {\rm s}) the arrow has gone straight upward to a height of 32.0 m above its launch point. What is the initial velocity and how long did it take for the arrow to reach 16.0 m above the launch point?
*June 30, 2010 by Todd*

**Phy**

You shoot an arrow into the air. Two seconds later (2.00 {\rm s}) the arrow has gone straight upward to a height of 32.0 m above its launch point. What is the initial velocity and how long did it take for the arrow to reach 16.0 m above the launch point?
*June 30, 2010 by Todd*

**Physics**

You shoot an arrow into the air. Two seconds later (2.00 {\rm s}) the arrow has gone straight upward to a height of 32.0 m above its launch point. What is the initial velocity and how long did it take for the arrow to reach 16.0 m above the launch point?
*June 30, 2010 by Todd*

**Physics**

A ball is thrown straight upward and returns to the thrower's hand after 3.40 s in the air. A second ball is thrown at an angle of 29.0 with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown vertically?
*October 13, 2010 by Sammy*

**physics**

A ball is thrown straight upward and returns to the thrower's hand after 2.20 s in the air. A second ball is thrown at an angle of 31.0 with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown vertically?
*November 18, 2010 by jennifer*

**physics**

Search: A block of steel (7900 kg/m3) is suspended from a spring scale. The scale is in newtons.What is the scale reading if the block is in air?What is the scale reading after the block has been lowered into a beaker of oil (900 kg/m3) and is completely submerged?
*December 17, 2010 by dora*

**physics**

A constant net force of 390 N is applied upward to a stone that weighs 31 N. The upward force is applied through a distance of 2.0 m, and the stone is then released. To what height, from the point of release, will the stone rise? Assume that air resistance is negligible.
*January 10, 2011 by Kay*

**chm**

Liquid nitrogen is obtained by condensing gaseous nitrogen found in air and boils at 77.36 K. At the boiling point, the density of the liquid is 809 g/L and that of the gas 4.566 g/L. How many liters of liquid nitrogen are produced when 500.0 L of nitrogen gas are liquefied ...
*February 2, 2011 by ami*

**Physics**

a man jumps off a bridge to see how high it is. he measures his time of descent. he is in the air for 3.0 s before splashing into the water below. a. How high is the bridge above the water? b. How fast is the man going as he hits the water?
*April 18, 2011 by joe*

**physics**

A plane flying horizontally at 50 m/s is 2000m from its target. a)At what height must a projectile be released in order to strike the ground target. (neglect air resistance) b)At what velocity will the projectile strike the target? c)What is the angle of impact with respect to...
*September 11, 2011 by Matthew*

**Chemistry**

A 1.250 g sample of copper wire was heated in air and reacted with oxygen to give 1.565 g of copper oxide product. Calculate the empirical formula of the copper oxide. Please help I'm lost. I need step by step Please and thank you
*September 21, 2011 by Monique*

**Physics(Please help)**

1) A cave explorer drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone striking the bottom is heard 1.33 s after the stone is dropped. How deep is the hole? I did 343 / 1.33. Is this correct?
*May 26, 2012 by Hannah*

**Physics**

A bee flies to a flower 549 m due south of its hive. The bees speed in still air is 0.58 m/s, and there is a wind blowing toward the south at 0.18 m/s. How long will it take the bee to travel to the flower and back to the hive? Answer in units of s
*February 6, 2013 by dallas*

**Math**

You throw a ball into the air with an initial vertical velocity of 31 feet per second. The ball leaves your hand when it is 6 feet above the ground. You catch the ball when it reaches a height of 4 feet. After how many seconds do you catch the ball?
*April 16, 2014 by Anonymous *

**physics**

A diamond in air is illuminated with white light. On one particular facet, the angle of incidence is 46.05. Inside the diamond, red light ( = 660.00 nm in vacuum) is refracted at 17.38 with respect to the normal; blue light ( = 470.00 nm in vacuum) is refracted at 17.09
*May 4, 2014 by ryan*

**Physics**

A ball is thrown straight upward and returns to the thrower's hand after 2.30 s in the air. A second ball is thrown at an angle of 42.0 with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown vertically?
*June 4, 2014 by Harley*

**organic chem**

Suppose you need to extract an organic substance S from water into ether, where the distribution constant Kdist = [S]org/[S]aq is at first unknown. a) By testing the solubility of the material in each solvent under saturating conditions at room temperature, you find that it ...
*February 2, 2010 by lisa*

**Chemistry**

Describe the effect on the concentration of the bold substance by the following change: decrease the volume The equilibrium is: 2HF(g) <--> F2(g) + H2; change in H=536KJ F2(g) is bolded. Shouldn't F2(g) increase when voume is decreased? Why is there no change? Thanks in ...
*January 19, 2010 by sh*

**science**

I am SOOOO stuck on this science question!! It's not that hard but, science isn't my forte..... here it is...." If the mass of the brick is 50 grams and it's volume is 9cm cubed, calculate the density of the block using the formula D = m/v." HELP PLEASE!!!!
*December 13, 2010 by Rachel Bond*

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