Monday

August 29, 2016
Number of results: 22,608

**Physics**

Two 2.160 kg crystal balls are 0.870 m apart in the vertical direction. Calculate the magnitude of the gravitational force they exert on a 8.80 g marble located 0.260 m horizontally out from the center of a line that intersects the centers of the balls. (For your own knowledge...
*December 17, 2007 by Lindsay*

**physics**

TWO BOXES A AND B ARE LYING ON THE TABLE AND ARE CONNECTED BY A PIECE OF STRING. THE MASS OF BOX A IS 3KG AND B IS 2KG. A 10N PULLING FORCE, POINTING TO THE RIGHT IS APPLIED TO BOX X CAUSING THE TWO BOXES TO MOVE TOGETHER AT CONSTA SPEED. a) determine the net force on A & B b...
*February 3, 2014 by THEMBINKOSI GASA*

**physics**

A 22.0-L tank of carbon dioxide gas (CO2) is at a pressure of 9.40 105 Pa and temperature of 22.0°C. (a) Calculate the temperature of the gas in Kelvin. K (b) Use the ideal gas law to calculate the number of moles of gas in the tank. mol (c) Use the periodic table to compute ...
*April 29, 2013 by Annette*

**epi**

In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. All lung cancer deaths were ascertained and the following data were available: •Fifteen (15) lung cancer deaths occurred among 24,500 smokers •Two (...
*October 9, 2008 by noni*

**Physics**

A cyclist intends to cycle up a 7.5 degree hill whose vertical height is 170 m. Assuming the mass of bicycle plus cyclist is 95 kg, calculate how much work must be done against gravity. If each complete revolution of the pedals moves the bike 5.6 m along its path, calculate ...
*November 16, 2010 by Linda*

**Physics**

The mass of Venus is 0.8140 times that of earth, and its radius is 0.950 times that of earth. Calculate the acceleration of gravity at the surface of Venus. Express your answer in g's (i.e. as a ratio to our acceleration of gravity). 9.01×10-1 is the correct ratio Calculate ...
*October 11, 2009 by Andy *

**chemistry**

Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 6.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
*February 4, 2012 by Katie*

**chemistry**

Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 6.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
*February 5, 2012 by Katie*

**CHEMISTRY**

a) Calculate the change in pH when 4.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). b) Calculate the change in pH when 4.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
*March 27, 2012 by Jematormal91*

**chemistry**

#1 A pipet delivers 10.5, 10.3, 10.9 and 10.7 ml (a) find the mean volume and deviation from the mean for each and calculate the average deviation from the mean (b) calculate the relative deviation (in %) for this set of data. Relative deviation (%) = (average deviation from ...
*December 10, 2012 by joanne*

**chemistry**

#1 A pipet delivers 10.5, 10.3, 10.9 and 10.7 ml (a) find the mean volume and deviation from the mean for each and calculate the average deviation from the mean (b) calculate the relative deviation (in %) for this set of data. Relative deviation (%) = (average deviation from ...
*December 10, 2012 by joanne*

**chemistry**

Calculate the change in pH when 9.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 9.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
*March 9, 2016 by james*

**Physics**

In class, we've been working on moment of inertia and recently did a lab regarding its usage. I don't feel too confident with the material yet and was hoping someone could look over my work and offer advice on what to do. We used solid spheres in the lab (2/5mr^2 used) and ...
*February 22, 2015 by Eva*

**Math**

Land growing continuous grain corn as a cash crop loses soil at a rate of 14.0 metric tonnes ha-1 yr-1. This is a fertile soil, which has an organic matter content of 3.8% and nitrogen content of 0.35% (both by mass). a) Calculate how long it will take to erode the entire Ah ...
*November 10, 2009 by rina math help*

**Finance**

You are considering opening a new plant. The plant will cost $100 million upfront. After that, it is expected to produce profits of $30 million at the end of every year. The cash flows are expected to last forever. Calculate the NPV of this investment opportunity if your cost ...
*July 20, 2010 by Anonymous*

**chemical and ionic equlibrium**

1. calculate H+ ion concentrates in 0.10 m acetic acid solutions. Given that dissociation constant of acetic acid in water is 1.8 * 10^-5 ? 2. Calculate the concentration of H+ and OH- in a 0.05 m HNO3 solutions at 25^0c ? 3. The degree of dissociation of pure water at 18^0c ...
*March 31, 2010 by pramod*

**physical**

When they start to move,car A exerts a force of 600N on its end of the towrope.The frictional force on car B when it accelerates,is 300N And its masses is 1200kg(a)calculate car bs initial acceleration(b)after a while the cars move at a constant velocity and car A exerts a ...
*March 7, 2012 by Anonymous*

**physics**

A 10,000N car is on a roller coaster. at the top of the tallest hill (position 1) the reaches a hieght 36m above the lowest point on the roller coaster (position 2). after accelerating down the hill the roller coaster makes another (position 3) climb that rises 20m about the ...
*April 23, 2013 by shkell*

**Physics**

A boat travelling at 30km/h relative to water is headed away from the bank of a river and downstream. The river is 1/2 km wide and flows at 6km/h. The boat arrives at the opposite bank in 1.25min. Calculate the component of the boat's velocity directed across the river. ...
*March 2, 2008 by Anonymous*

**chemistry**

Calculate the temperature change in the water upon complete melting of the ice. Hint: Determine how much heat is absorbed by the melting ice and then use q =mC*Delta T to calculate the temperature change of the 314 g of water. under the following conditions: A 14.7 g ice cube ...
*November 17, 2010 by jose*

**Physics **

A box slides down a frictionless, 10-meter, 30o incline. Calculate the gravitational potential energy at both the beginning and end of the motion. Calculate the work done by GRAVITY as the box slides down the incline. Compare this to the overall change in gravitational ...
*March 22, 2016 by Julie*

**Chemistry**

Suppose that 1.048 g of benzene is combusted in a bomb calorimeter which contains 945 g of water. The temperature of the water increases from 23.640 OC to 32.681 oC. The heat capacity of the empty calorimeter is 891 J/ OC . C6H6 (l) + 15/2 O2 (g) > 3 H2O (l) + 6 CO2 (g) (a...
*November 15, 2014 by Mahnoor*

**Physics**

Now your bicycle wheel is rotating with an angular speed of 43.8 rad/s. The wheel has a mass of 4.9 kg and a radius of 48.6 cm. Treat the wheel as a solid thin disc. (a) Calculate the rotational kinetic energy of the wheel in J. (b) Calculate the angular speed the wheel must ...
*April 22, 2016 by Jannia*

**Physics**

(a) calculate the energy in joules put out by a 9.0 V calculator battery that moves 3.0 C of charge through a handheld calculator after 1 hr of operation. (b) calculate the energy put out by a 12.0 V car battery that moves 1000 C of charge (as it may when starting the car's ...
*May 10, 2010 by Nina*

**SCIENCE/MATH**

Land growing continuous grain corn as a cash crop loses soil at a rate of 14.0 metric tonnes ha-1 yr-1. This is a fertile soil, which has an organic matter content of 3.8% and nitrogen content of 0.35% (both by mass). a)Calculate how long it will take to erode the entire Ah ...
*November 6, 2009 by SAMY*

**physics**

How do you calculate radial force? Just to qualify, I am given a radial acceleration. If you are given the component of the acceleration in the radial direction, then you need to multiply that by the mass. If you are given the time dependence of the coordinates, then you must ...
*November 21, 2006 by Sam*

**Physics**

1.A 60.2 kg bungee jumper jumps from a bridge. She is tied to a 13.8 m long bungee cord and falls a total of 34.4 m. Calculate the spring constant k of the bungee cord. 2.Calculate the maximum acceleration experienced by the jumper. Im stuck on the first because Im not sure ...
*October 27, 2007 by Britney*

**Chemistry**

The adult blue whale has a lung capacity of 5.0*10^3L. Calculate the mass of air (assume an average molar mass 28.98 g/mol ) contained in an adult blue whale’s lungs at 0.3 degrees Celcius and 1.10 atm., assuming the air behaves ideally. Calculate the number of molecules in a ...
*December 6, 2011 by Steffani*

**physics**

When the Sun is directly overhead, a hawk dives toward the ground with a constant velocity of 4.80 m/s at 50.5° below the horizontal. Calculate the speed of her shadow on the level ground. What i have done: x= rcos(theta) x=4.80m/s*cos(309.5) x=3.05m y=rsin(theta) y=4.80m/s*...
*September 11, 2014 by Gaby*

**maths**

How to calculate the mean number of threatened fishes, where total number of fishes is 29300 and number of threatened fishes is 1173. Hmmmm. you have one data point, that is, 1173 fish are threatened. The mean of one number is that number. Is there something else here? Thats ...
*May 20, 2007 by Ellie*

**physical science **

a bot throws a cricket ball witg an initial velocity of 5m.s from the edge of a tall building.it passes the edge of the building on its way down and strikes the ground below after 5seconds (neglect effects of friction. question1...how does the acceleration of the ball moving ...
*March 13, 2013 by kgaogelo*

**physical science **

a bot throws a cricket ball witg an initial velocity of 5m.s from the edge of a tall building.it passes the edge of the building on its way down and strikes the ground below after 5seconds (neglect effects of friction. question1...how does the acceleration of the ball moving ...
*March 13, 2013 by kgaogelo*

**chemistry**

A 10.0 mL sample of 3.00 M KOH(aq) is transferred to a 250.0 ml volumetric flask and diluted to the mark. It was found that 38.5 ml of this diluted solution was needed to react the stoichimetric point in a titration of 10.0 mL of a phosphoric acid, H3PO4, solution. The ...
*June 20, 2009 by dan*

**Calculate the oscillation frequency f of the H2 mo**

When displaced from equilibrium by a small amount, the two hydrogen atoms in an \rm H_{2} molecule are acted on by a restoring force F_{x}=-k_1 x with k_1 = 510 N/m. Calculate the oscillation frequency f of the H2 molecule. Use m_eff = m/2 as the "effective mass" of the system...
*April 15, 2010 by Tyler*

**waste water treatment**

Wastewater from a small town is treated in a trickling filter which is preceeded by a screen, sand-removal and primary clarification. The maximum hydraulic capacity, or peak flow, of the treatment plant is 1,500 m3/h. The dry weather flow (Qdwf) amounts 7,500 m3/day, with a ...
*November 25, 2013 by Nilu*

**Please Check My Math Answers. Thanks!**

Can someone please be kind enough to check my answers? Thanks! :) I put stars by my answers. 1. Calculate the slant height for the given cone. Round to the nearest tenth. Diameter= 8cm Height= 9cm a. 10.2 cm b. 11.4 cm c. 9.8 cm *** d. 12.0 cm 2. Calculate the slant height for...
*March 10, 2015 by OceanBreeze*

**AP physics B**

A billiards cue ball of mass 0.380 kg has a perfectly elastic head-on collision with a standard pool ball. The second pool ball which started at rest travels with a speed which is half the original speed of the cue ball. (a) Calculate the mass of the pool ball. kg (b) ...
*November 2, 2012 by Need help fast*

**physics**

A soccer ball is kicked with an initial speed of 10.8 m/s in a direction 24.9° above the horizontal. Calculate the magnitude of its velocity 0.310 s after being kicked. What was its direction? Calculate the magnitude of its velocity 0.620 s after being kicked. What was its ...
*September 5, 2013 by Anonymous*

**physics**

A soccer ball is kicked with an initial speed of 10.8 m/s in a direction 24.9° above the horizontal. Calculate the magnitude of its velocity 0.310 s after being kicked. What was its direction? Calculate the magnitude of its velocity 0.620 s after being kicked. What was its ...
*September 5, 2013 by Anonymous*

**PHYSICS**

A particle with a mass of 2.00x10-16 kg and a charge of 22.0 nC starts from rest, is accelerated by a strong electric field, and is fired from a small source inside a region of uniform constant magnetic field 0.660 T. The velocity of the particle is perpendicular to the field...
*July 2, 2011 by jim*

**Chemistry**

I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 : mass 18.01 g volume ...
*April 30, 2015 by Jennie*

**Chemistry**

I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 : mass 18.01 g volume ...
*April 30, 2015 by Jennie*

**chemistry**

In the fifth reaction of Glycolosis, G3P dehydrogenase converts glyceraldehydes-3-phosphate into glycerate-1,3-bisphosphate. In order to make the reaction spontaneous at biological conditions it must be coupled to the reduction of NAD+. a) DG° for the reaction of just G-3-P, ...
*February 11, 2009 by kat*

**Chemistry Help!!!**

1) When hydrazine (N2H4) is burned in a 253-g brick container, the temperature of the brick increases by 5.13 degrees Celsius. Calculate the quantity of heat released in this raection. The specific heat of brick is 0.840 J/(gC). 2) A sample of coal is burned in a bomb ...
*November 14, 2010 by Sarah*

**Physics**

A thin uniform rod has mass M = 0.5 kg and length L= 0.49 m. It has a pivot at one end and is at rest on a compressed spring as shown in (A). The rod is released from an angle θ1= 55.0o, and moves through its horizontal position at (B) and up to (C) where it stops with &#...
*February 11, 2014 by Tomas*

**Physics**

An electron is accelerated through a uniform electric field of magnitude 2.5x10^2 N/C with an initial speed of 1.2x10^6 m/s parallel to the electric field. a) Calculate the work done on the electron by the field when the electron has travelled 2.5 cm in the field. b) Calculate...
*April 21, 2009 by Linn*

**P-Chem**

The equilibrium constant K for the hydrolysis of adenosine triphosphate (ATP) to adenosine diphosphate (ADP) and phosphate is 1.66X10^5 at 37 degrees celcius, and Standard Delta H is -20.1 kJ/mol. Calculate Standard Delta S for the hydrolysis at 37 degrees celcius. On the ...
*October 20, 2006 by Angela*

**math**

I have a revolving credit account that uses the average daily balance to calculate finance charges. during april 2007 ( amonth with 30 days) I had an unpaid balance of $445.12 for 18 days and a unpaid balance of $221.38 for 12 days . How do you calculate the average daily ...
*November 3, 2008 by unknown*

**Chemistry**

Calculate the concentrations of S2O8 2-, I-, S2O32 2- in moles per litre of reaction mixture given the following: 20mL of 0.1 M (NH4)2S2O8 added to: 20mL of 0.2M KI 10mL of 0.01M Na2S2O3 5mL 0.2% starch Also, calculate -(delta)S2O8 2- that is, how much S2O8 2- is used up (...
*January 24, 2011 by Rachel*

**chemistry**

consider a random mixture of two particles,diamond and SiC.Assume all particles are spherical with a radius of 0.100mm. The mixture is 80.0 wt% diamond(density=3.51 g/ml) and 20.0 wt% SiC (density=3.23 g/ml) a)Calculate the mass of a single particle diamond and the number of ...
*October 2, 2012 by mahtab*

**physics**

A pair of narrow, parallel slits separated by 0.234 mm are illuminated by the green component from a mercury vapor lamp (ë=531.5 nm). The interference pattern is observed on a screen 1.21 m from the plane of the parallel slits. a)Calculate the distance from the central maximum...
*November 29, 2009 by Anonymous*

**CHEMISTRY**

I need help with these problems ASAP: I need help setting these problems up: pleas!! (1)Calculate the volume of 1.87 M NaI that would be needed to precipitate all of the Hg+2 ion from 199 mL of a 1.96 M Hg(NO3)2. The equation for the reaction is 2NaI (aq) + Hg(NO3)2 (aq) ---&...
*July 20, 2010 by Priya*

**PHYSICS!!**

I've tried this problem again and again using conservation of momentum and energy but I am not having any luck: A ball of mass 0.300kg that is moving with a speed of 8.0m/s collides head-on and elastically with another ball initially at rest. Immediately after the collision, ...
*October 11, 2013 by Alison*

**engineering physics 2**

A 19 m long piece of wire of density 8.34 g/m3 has a diameter of 12.593 mm. The resistiv- ity of the wire is 1.7e-8(ohm)(m) at 20 degrees celsius. The temperature coefficient for the wire is 0.0038(degrees celsius)^-1. Calculate the resistance of the wire at 20degrees Celsius...
*February 28, 2008 by David*

**Physics**

A 63 Ω resistor is connected to a 4.7 V battery a) When the switch is closed, calculate the current I. Answer in units of A. A 7.4 Ω resistor is connected to a 4.7 V battery When the switch is closed, calculate the current I. A 69 Ω resistor is connected to a 4....
*November 1, 2012 by Aj*

**Physics - important**

An electron is accelerated through a uniform electric field of magnitude 2.5x10^2 N/C with an initial speed of 1.2x10^6 m/s parallel to the electric field. a) Calculate the work done on the electron by the field when the electron has travelled 2.5 cm in the field. b) Calculate...
*April 21, 2009 by Linn*

**Physics **

An electron with a horizontal speed of 4.0 * 10^6 m/s and no vertical component of velocity passes through two horizontal parallel plates. The magnitude of the electric field between the plates is 150 n/c the plates are 6.0 long A) calculate the vertical component of the ...
*January 10, 2013 by Kara*

**Chemistry Dr. Bob**

I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 : mass 18.01 g volume ...
*April 30, 2015 by Jennie*

**CHEM**

am lost. I have to create a buffer using NH4CL and 0.10 M NH3. I have to chose how much of the reagent to use in order to get a concentration between 0.01 and .5 M. Then after I come up with the recipe for that I have to calculate the pH based on the concentrations using the ...
*April 5, 2016 by Erica*

**math**

the angle of depression of a ship from a top of a tower is 46deree. a. If a ship is 126m from the foot of the tower, calculate the height of the tower. b. If the height of the tower is 72m tall, calculate the distance between the (i) ship and the foot of the tower (ii) ship ...
*May 11, 2016 by Josehp *

**Chemistry **

1) When hydrazine (N2H4) is burned in a 253-g brick container, the temperature of the brick increases by 5.13 degrees Celsius. Calculate the quantity of heat released in this raection. The specific heat of brick is 0.840 J/(gC). 2) A sample of coal is burned in a bomb ...
*November 14, 2010 by Sarah*

**Chemistry **

1) When hydrazine (N2H4) is burned in a 253-g brick container, the temperature of the brick increases by 5.13 degrees Celsius. Calculate the quantity of heat released in this raection. The specific heat of brick is 0.840 J/(gC). 2) A sample of coal is burned in a bomb ...
*November 14, 2010 by Sarah*

**Physics**

A spring loaded ballistic pendulum gun requires an increasing force to load. When loading a ball of mass 0.054 kg, the spring is compressed 7.00 cm, the gun is fully loaded, and the force required is 70.0 N. a) Calculate the work required to load the gun. b) Calculate the ...
*April 12, 2016 by Emily*

**Physics**

The human egg cell above is magnified using a 10´ ocular lens and a 40´ high power objective lens. (a) Calculate the overall magnification. (b) If the field of view at high-power magnification is 400 mm, calculate the size of the field of view when the magnification is ...
*May 10, 2016 by HELP ASAP*

**Science**

The human egg cell above is magnified using a 10´ ocular lens and a 40´ high power objective lens. (a) Calculate the overall magnification. (b) If the field of view at high-power magnification is 400 mm, calculate the size of the field of view when the magnification is reduced...
*May 12, 2016 by HELP ASAP*

**Physics**

The human egg cell above is magnified using a 10´ ocular lens and a 40´ high power objective lens. (a) Calculate the overall magnification. (b) If the field of view at high-power magnification is 400 mm, calculate the size of the field of view when the magnification is reduced...
*May 12, 2016 by help please*

**Chemistry**

A large sport utility vehicle has a mass of 2500kg. Calculate the mass of CO2 emitted into the atmosphere upon accelerating the SUVfrom 0.0mph to 66.0 mph. Assume that the required energy comes from the combustion of octane with 30% efficiency. (Hint: Use KE= 1/2mv^2 to ...
*December 3, 2010 by Ashley*

**Physics**

Astrology, that unlikely and vague pseudoscience, makes much of the position of the planets at the moment of one’s birth. The only known force a planet exerts on objects on Earth is gravitational. (a) Calculate the gravitational force exerted on a 4.20 kg baby by the Earth. (b...
*June 8, 2014 by Anonymous*

**Chemistry **

1. A graduate measured out a 100. mL hard water sample and titrated it with 37.6 mL of 0.0100 M EDTA solution for a total hardness endpoint, and 29.3 mL of 0.0100 M EDTA solution for a calcium endpoint. Calculate the molarity with respect to magnesium and calcium. Please ...
*January 21, 2016 by Adam*

**Chemistry**

Calculate the pH of 100.0 mL of .0200 M pyruvic acid and .0600 M sodium pyruvate Calculate the pH of 100.0 mL of .0200 M pyruvic acid and 0.0600 M sodium pyruvate with 0.250 millimoles of H3O+ added.
*November 8, 2011 by Jessica*

**chemistry 106**

Dry air near sea level has the following composition by volume: N2, 78.08 percent; O2, 20.94 percent; Ar, 0.93 percent; CO2, 0.05 percent. The atmospheric pressure is 1.00 atm. (Hint: Since volume is proportional to the number of moles present, mole fractions of gases can be ...
*March 1, 2010 by Tanisha*

**Chemistry**

When 35.0 mL of 1.43 M NaOH at 22.0 degres Celsius is neutralized by 35.0 mL of HCL also at 22.0 degrees Celsius in a coffee-cup calorimeter, the temperature of the final solution rises to 31.29 degrees Celsius. Assume that the specific heat of all solutions i 4.18 J/ g* C, ...
*March 19, 2010 by Google*

**physics**

In a large hotel, a fast elevator takes you from the ground floor to the 21st floor. The elevator takes 17 s for this trip: 5 s at constant acceleration, 7 s at constant velocity, and 5 s at constant deceleration. Each floor in the hotel has a height of 2.5 m. Calculate the ...
*September 26, 2011 by K*

**U.S. and Global Economics: Involving MATH**

PLZZZ.. Help I just don't understand how to calculate this A landlord wants to acquire an additional apartment building for $250,000. The new building contains eight apartment units, which will each rent for $500 per month. The bank is willing to loan the landlord the money ...
*November 13, 2013 by Mary*

**AP Chemistry**

1) Calculate the volume of air at 30 degrees C and 1.00 atm that is needed to burn completely 10.0 grams of propane. Assume that air is 21.0 percent O2 by volume. 2) Assuming all of the heat evolved in burning 30.0 g of propane is transferred to 8.00 kg of water (specific heat...
*October 29, 2006 by OhGodChemistry*

**Managerial accounting**

[Figure 5-1]. - The receiving department of Owen has three activities: unloading, counting goods, and inspecting. Unloading requires a forklift that is leased for $15,000 per year. The forklift is used only for unloading. The fuel for the forklift is $2,000 per year. ...
*January 7, 2013 by Anonymous*

**AP Chem - to Dr. Bob**

I don't understand how to even start this problem: A mixture of H2(g), O2(g), and 2 mL of H2O is present in a 0.5 L rigid container at 25 degrees Celsius. The number of moles of H2 and the number of moles of O2 are equal. The total pressure is 1146 mmHg. Vapor pressure of ...
*January 23, 2007 by Belinda*

**Math**

A piece of wire is bent to form a square of area 121cm. Calculate: a)the length of each side of the square. b)the perimeter of the square. The piece of wire is now bent to form a circle using π=3.14 Calculate: a)the radius of the circle b)the area of the circle
*September 24, 2015 by Baller T*

**physics**

You are designing a centrifuge to spin at a rate of 13,880 rev/min. (a) Calculate the maximum centripetal acceleration that a test-tube sample held in the centrifuge arm 14.6 cm from the rotation axis must withstand. (b) It takes 1 min, 17 s for the centrifuge to spin up to ...
*August 31, 2011 by lindsey*

**math**

john has a loan but doesn't begin to repay his loan for 11 months, at a rate of $500 every month of four month. the interest rate is 8% compounded monthly determin the size of the loan using the following 2 steps 1. calculate the present value, pv1 of annuity payment at the ...
*August 9, 2012 by jule*

**Physics**

A block of mass 5.53 kg lies on a frictionless horizontal surface. The block is connected by a cord passing a. over a pulley to another block of mass 2.25 kg which hangs in the air. Assume the cord to be light (massless and weightless) and unstretchable and the the pulley to ...
*February 21, 2014 by Emeera*

**chemistry**

The density of liquid water is 0.997 g/mL at 25 degrees Celsius. a) Calculate the mass of 250.o mL (about a cupful) of water. b) How many moles of water are in 250.0 mL of water? Use the result from letter a. c) Calculate the volume that would be occupied by 2.000 mol of water...
*November 15, 2011 by khloe*

**Chemistry**

24.0 mL of 2.4 M silver nitrate is mixed with 32.0 mL of 2.0 M sodium chloride. ( I wrote the balanced equation as AgNo3+NaCl -> NaNo3 + AgCl ) A) Identify the precipitate formed by name and formula. - I wrote AgCl (silver chloride) B) Calculate the mass of precipitate ...
*March 2, 2016 by Sara*

**Quantitative, stastics and business**

The distribution of annual earnings of all bank tellers with five years of experience is skewed negatively. This distribution has a mean of Birr 15,000 and a standard deviation of Birr 2000. If we draw a random sample of 30 tellers, what is the probability that their earnings ...
*April 24, 2016 by Tofik*

**math**

a group of fifth grade students in New Zealand are going camping. They will hike from Wellington to Ruapehu. Then they will follow a trail for another 1/2 mile to their campsite. I was able to calculate the distance from Wellington to Ruapehu by using the map scale. It is 200 ...
*September 15, 2010 by hope*

**Physics**

You observe an arti cial satellite orbiting the earth and estimate it is at an altitude h = [03] km above the earth's surface and has a mass m = 3500 kg. You wish to calculate when the satellite will be back in the same position. From the second law of motion and the ...
*April 1, 2010 by Adrianne*

**Math**

A stem-and-leaf plot shows the heights in centimeters of Teddy Bear sunflowers grown in two different types of soil. Soil A Soil B 5 9 5 2 1 1 6 3 9 5 1 0 7 0 2 3 6 7 8 2 1 8 3 0 9 Key:9|6 means 69 Key: 5|8 means 58 a) Describe the overlap of the two sets of data. b) Calculate...
*May 16, 2013 by Miae*

**physics**

A rocket carrying a satellite is accelerating straight up from the earth's surface. At 1.20 after liftoff, the rocket clears the top of its launch platform, 68 above the ground. After an additional 4.85 , it is 1.50 above the ground.Calculate the magnitude of the average ...
*March 11, 2012 by Muhammad*

**Physics **

A boat traveling at 9.50 m/s relative to the water aims to go straight across a river. If the river is 106.0 m wide and the current in the river is 3.50 m/s, how far downstream will the boat land on the other side of the river? Calculate the answer in meters (m) and rounded to...
*September 14, 2015 by Anonymous*

**Chemistry**

Given the following equation: SO2 + NO2 <--> SO3 + NO At 25 Celcius, 2.00 mol of each of SO2 and NO2 are introduced into a 1.0L sealed flask. When euilibrium is reached, it is found that [NO2] = 1.30 mol/L [SO3] = 1.30 mol/L -- Calculate the concentration at equilibrium ...
*November 8, 2006 by Lily*

**Chemistry**

1) Write a balanced chemical equation for the reaction between Cu(NO3)2 * 3 H2O and NaOH. Underline the formula for the precipitate produced by this reaction. (The water of hydration in Cu(NO3)2 * 3 H2O appears as liquid water on the right side of the equation) 2) Calculate ...
*May 17, 2010 by Sarah*

**Finance**

We are evaluating a project that costs $1,120,000, has a ten-year life, and has no salvage value. Assume that depreciation is straight-line to zero over the life of the project. Sales are projected at 64,000 units per year. Price per unit is $50, variable cost per unit is $25...
*March 8, 2015 by Sarah*

**Chemistry**

A titration involves titrating 0.4 M NaOH into a solution of 0.2 M H3PO4. a.) Calculate the volume of NaOH that will be required to reach the first equivalence point. b.) Calculate the volume of NaOH required to reach the second equivalence point. Other information: 10 ml ...
*February 8, 2014 by Anonymous*

**chem**

The specific heat capacity of silver is 0.24 J/°C·g. (a) Calculate the energy required to raise the temperature of 140.0 g Ag from 273 K to 295 K. J (b) Calculate the energy required to raise the temperature of 1.0 mol Ag by 1.0°C (called the molar heat capacity of silver). J/...
*November 26, 2007 by mel*

**chemistry**

Calculate the Molarity of the unknown acid if 25.0 mL of the acid reacts with 17.50 mL of 0.14 M NaOH solution. Assume that NaOH and acid react in 1:! ratio. Show your work. (Hint: Find the moles of NaOH from the given molarity and volume. mols of NaOH = mols of acid. Knowing ...
*March 16, 2016 by shosho*

**ROI and NPV**

In the following problems, you will calculate the “simple metrics” for project selection. For these problems, please use the following data and assume discount rate (interest rate) of 0.06. Project A The upfront cost of the project is $500,000. This cost is incurred in year 1...
*February 27, 2011 by Anonymous*

**chemistry**

(AAAAA)The standard reduction potentials of lithium metal and chlorine gas are as follows: (for Li, reduction potential is -3.04, for Cl it is 1.36) In a galvanic cell, the two half-reactions combine to 2Li{+](s) + Cl{-}2(g) --> 2Li{+}Cl{-}(aq) Calculate the cell potential ...
*April 28, 2011 by lili*

**chem**

a) Calculate the pressure exerted by 0.5160 mol N2 in a 1.0000 L container at 24.6°C using the ideal gas law. atm (b) Calculate the pressure exerted by 0.5160 mol N2 in a 1.0000 L container at 24.6°C using the van der Waals equation. atm (c) Compare the results. (Write the ...
*November 17, 2007 by mel*

**chemistry**

For the reaction shown below complete the following calculations. H2(g) + C2H4(g) --> C2H6(g) (a) Estimate the enthalpy of reaction using the bond energy values in Table 9.4. (b) Calculate the enthalpy of reaction, using standard enthalpies of formation. (ΔH°f for H2, ...
*October 27, 2008 by hannah*

**physics**

A block of mass 3.62 kg lies on a frictionless horizontal surface. The block is connected by a cord passing over a pulley to another block of mass 7.8 kg which hangs in the air, as shown. Assume the cord to be light (massless and weightless) and unstretchable and the pulley to...
*November 15, 2012 by alice*