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Questions Asked on March 26, 2010

verify the identity:sin(x+y)-sin(x-y)=2cosx siny
1. 1 answer
2. asked by stacey graham
3. 6,446 views
A flywheel of moment of inertia 0.32 kgm^2 is rotated steadily at 120rad/s by a 50 W electric motor. (i)find the kinetic energy
1. 1 answer
2. asked by Edwin
3. 4,980 views
I'm understanding most of this physics, but here is one last question I would appreciate help on. Thank you!Okay, so the
1. 3 answers
2. asked by Demi
3. 4,971 views
In February 1955, a paratrooper fell 365 m from an airplane without being able to open his chute but happened to land in snow,
1. 1 answer
2. asked by dave
3. 4,585 views
Calculate the [h3o+] of the following polyprotic acid solution: 0.135 M H2CO3
1. 1 answer
2. asked by Krysten
3. 4,543 views
A household bleach solution contains 5.25% (by mass) NaClO. How many moles of NaClO are needed to make 1000 L of the solution?
1. 1 answer
2. asked by Staci
3. 3,482 views
I appreciate any help! Thank you!!How much energy must be added to a bowl of 125 popcorn kernels in order for them to reach a
1. 2 answers
2. asked by Demi
3. 3,443 views
what is the conjugate base of H2SO3??
1. 1 answer
2. asked by Anonymous
3. 3,108 views
A bowling ball of mass 7.3 kg and radius 9.6 cm rolls without slipping down a lane at 3.4 m/s. Calculate its total kinetic
1. 1 answer
2. asked by Anonymous
3. 3,064 views
Many cigarette lighters contain liquid butane, C4H10(l). Using standard enthalpies of formation, calculate the quantity of heat
1. 3 answers
2. asked by hello
3. 2,986 views
A Jeweler working with a heated 47g gold ring must lower the ring's temperature to make it safe to handle. If the ring is
1. 4 answers
2. asked by Demi
3. 2,968 views
A rocket is fired straight up through the atmosphere from the South Pole, burning out at an altitude of 208 km when traveling at
1. 1 answer
2. asked by nate
3. 2,863 views
A solution is made by dissolving 0.100 mol of NaCl in 5.35 mol of water. What is the mass % of NaCl?So far, I have determined
1. 1 answer
2. asked by Jon
3. 2,758 views
A flywheel with an axle 1.0cm in diameter is mounted in frictionless bearings and set in motion by applying a steady tension of
1. 4 answers
2. asked by Edwin
3. 2,455 views
A 5.00-kg object placed on a frictionless, horizontal table is connected to a cable that passes over a pulley and then is
1. 3 answers
2. asked by Brandon
3. 2,393 views
If the amplitudes of the two waves are 3 units and 1 unit respectively, show by the principle of superposition that the ratio of
1. 2 answers
2. asked by Edwin
3. 2,198 views
A plane progressive wave is represented by the equation: y= 0.1sin(200pi(t)-20pi(x/17) where y is the displacement in
1. 3 answers
2. asked by Edwin
3. 2,125 views
The chemical formula for glucose is C6H12O6. Six molecules of carbon dioxide (CO2) react with six molecules of water (H2O) to
1. 2 answers
2. asked by Sabrina
3. 1,984 views
A mountain climber friend with a mass of 80kg ponders the idea of attaching a helium-filled balloon to himself to effectively
1. 1 answer
2. asked by Gail
3. 1,970 views
The tires of a car make 63 revolutions as the car reduces its speed uniformly from 94.0 km/h to 58.0 km/h. The tires have a
1. 1 answer
2. asked by Anonymous
3. 1,848 views
Graph using the slope and the y-intercept.x+5y=20. Here is what I came up with: 5y=x(0)+20 5(0)= x+20 5y/5=20/5 x=20 (20,0) y=4
1. 3 answers
2. asked by B.B.
3. 1,760 views
In a study designed to prepare new gasoline resistant coatings, a polymer chemist dissolves 6.053g of poly in enough water to
1. 1 answer
2. asked by Mike
3. 1,721 views
For the system 2A (g) + B( g) = 2C (g), if the initial concentration of pure C is 1.00 M, the equilibrium concentration is 0.40
1. 3 answers
2. asked by AMI
3. 1,594 views
Bob and his dad visited the hardware store on Saturday. They observed the following transactions:Mr. Harris bought 4 for $0.50,
1. 3 answers
2. asked by Daniel
3. 1,579 views
9x^2 + 16y^2 - 36x + 96y + 36 = 0 How do i find the major axis?
1. 1 answer
2. asked by mike
3. 1,510 views
Consider the following equilibrium:PCl3 + Cl2 = PCl5 Kc=26 @ 250 degree Celcius 1.0 mol of PCl3 , 1.0 mol of Cl2 , and 5.0 mol
1. 3 answers
2. asked by AMI
3. 1,497 views
A 2.00g sample of a gas SX6 has a volume of 329.5 cm3 at 1.00 atm and 20 celcius. What element is X?
1. 1 answer
2. asked by Meg
3. 1,417 views
Circle L has segment LJ and segment LK as radii. Those 2 segments are perpendicular. Segment KM and segment JM are tangent to
1. 2 answers
2. asked by Kat
3. 1,331 views
Hi I'm stuck on these questions can you please help meA soil sample contains 0.2234 g of Fe3+ per 100g. Fe3+ is precipitated
1. 1 answer
2. asked by Sarah
3. 1,330 views
a)The element with the greatest density is osmium, which has a density of 22.6g/cm3. Calculate the mass of 32.1 cm3 of osmium.b)
1. 1 answer
2. asked by Anonymous
3. 1,309 views
Find two functions f and g such that (f X g)(x) = h(x). (There are many correct answers.)h(x) = 4 / (5x + 2)^2 = My answers
1. 1 answer
2. asked by Hannah
3. 1,273 views
A 15-year old female patient has experienced daily nausea for the past two months. The patient states that she feels like "I've
1. 1 answer
2. asked by Brenda
3. 1,268 views
An Atwood machine is constructed using a disk of mass 2 kg and radius 20.1 cm.2.3 m= distance between weights 1.53 kg= weight 1
1. 2 answers
2. asked by Caryn
3. 1,267 views
A class is given a list of eight study problems from which five will be part of an upcoming exam. If a given student knows how
1. 0 answers
2. asked by Hailey
3. 1,260 views
Sheryl correctly answered 85% of the questions on her 200-question biology final.Fernando scored a 90% on his 180-question
1. 1 answer
2. asked by Kirk
3. 1,245 views
An alpha particle (mass = 6.6 × 10-24 g) emitted by radium travels at 3.4 × 107± 0.1 × 107 mi/h. What is its de Broglie
1. 1 answer
2. asked by brittany
3. 1,244 views
verify the identity:sec(beta)+ tan (beta)= cos(beta)/ 1-sin(beta)
1. 1 answer
2. asked by stacey graham
3. 1,239 views
how do participation contracts represent financial opportunities for providers?
1. 0 answers
2. asked by Kay
3. 1,239 views
4x^2-25y^2-8x-100y-196=0 how do i find the conic section to find the center?
1. 3 answers
2. asked by bbb
3. 1,237 views
if i have to write a passage using rhetorical devices on a person or an ideology..what would be the best thing for me to write
1. 6 answers
2. asked by pat
3. 1,164 views
Identify where the program planning and evaluation process can provide opportunities for program improvement.Explain the how
1. 1 answer
2. asked by ttnl
3. 1,160 views
Microwave ovens use microwave radiation to heat food. The microwaves are absorbed by moisture in the food, which is transferred
1. 1 answer
2. asked by andrea
3. 1,149 views
find the exact value given that cosA=(1/3) in quad I, sin B=(-1/2) in quad 4, and sin C=(1/4) in quad 2tan(B+C)
1. 1 answer
2. asked by stacey graham
3. 1,146 views
A horizontal 873 N merry-go-round of radius 1.11 m is started from rest by a constant horizontal force of 70.6 N applied
1. 2 answers
2. asked by Caryn
3. 1,139 views
what is conjugated base of NH4+
1. 1 answer
2. asked by Eric
3. 1,136 views
Determine the domains of (a)f and(b) f X g f(x) = 1/x g(x)= x + 3 For the domain of f I had x > 0 and for f X g I had all real
1. 2 answers
2. asked by Hannah
3. 1,131 views
you currently have 12 bottles on you shelf.and you want to keep a min of 6 bottles on you shelf.you average sales is 2 per day
1. 1 answer
2. asked by kaila
3. 1,121 views
Water flows steadily along a uniform flow tube of cross-section 30cm^2. The static pressure is 1.20 x 10^5 Pa and the total
1. 1 answer
2. asked by Edwin
3. 1,117 views
True or False?:The random segregation of chromosomes during meiosis explains Mendel's observation that genes for different
1. 1 answer
2. asked by I Need Help
3. 1,107 views
A buffer contains 1.0mol CH3CO2H and 1.0mol CH3CO2^- diluted with water to 1.0L. How many moles of NaOH are required to increase
1. 1 answer
2. asked by Sean
3. 1,104 views
A 16 kg mass is attached to a cord that is wrapped around a wheel with a radius of 10.9cm. The acceleration of the mass down the
1. 1 answer
2. asked by Caryn
3. 1,094 views
Can you determine the mass of carbon monxide that is produced when 45.6 grams of methane reacts with 73.2 grams of oxygen gas.
1. 1 answer
2. asked by Stacey
3. 1,082 views
A progressive and a stationary simple harmonic wave each have the same frequency of 250Hz and the same velocity of 30m/s.
1. 1 answer
2. asked by Edwin
3. 1,073 views
Consider the following equilibrium:PCl5 = PCl3+ Cl2 5.0 moles of are placed in a 10.0 L flask at 200 C and allowed to come to
1. 2 answers
2. asked by AMI
3. 1,070 views
water flows along a horizontal pipe of cross-sectional area 48cm^2 which has a constriction of cross-sectional area 12cm^2 at
1. 1 answer
2. asked by Edwin
3. 1,067 views
Complete with the appropriate word:1. Cuando empieza el segundo ______, los jugadores vuelven al campo. 2. Juegan futbol en el
1. 2 answers
2. asked by Ashley
3. 1,064 views
An amino acid will have the form shown at:R-CH-C-OH (with an O double bonded to the C and a NH3+ bonded to the CH) a) a pH of
1. 1 answer
2. asked by Holly
3. 1,050 views
particle 1 of mass m1 = 0.29 kg slides rightward along an x axis on a frictionless floor with a speed of 1.8 m/s. When it
1. 2 answers
2. asked by mike
3. 1,045 views
tan(theta)=(7/24), sin(theta)<0find cos(2theta)
1. 2 answers
2. asked by stacey graham
3. 1,042 views
The static pressure in a horizontal pipeline is 4.3 x 10^4 Pa, the total pressure is 4.7 x 10^4 Pa, and the area of
1. 1 answer
2. asked by Edwin
3. 1,027 views
Given the following equilibrium constants,Ka (NH4^+)=5.6*10^-10 Kb (NO2^-)=2.2*10^-11 Kw=1.00*10^-14 determine the equilibrium
1. 2 answers
2. asked by Katie
3. 994 views
will 1 molar NH3 and 1 molar NH4Cl form a buffered solution?
1. 1 answer
2. asked by Anonymous
3. 977 views
Determine the domains of (a)f and(b) f X g f(x) = 1/x g(x)= x + 3 For the domain of f I had x > 0 and for f X g I had all real
1. 1 answer
2. asked by Hannah
3. 973 views
what two metals that will not generate hydrogen gas when treated with an acid?
1. 1 answer
2. asked by nicole
3. 972 views
A copper wire weighing 5.463g was dissolved in excess nitric acid, precipitated as copper(2)carbonate with excess sodium
1. 3 answers
2. asked by 496935sd
3. 942 views
an airplane leaves the airport and flies due west 150 miles and then 240 miles in the direction 200°40'. Assuming the earth is
1. 1 answer
2. asked by kat
3. 929 views
Four hundred people apply for three jobs. 130 of the applicants are women.(a) If three persons are selected at random, what is
1. 7 answers
2. asked by kay
3. 929 views
what is data management technology
1. 1 answer
2. asked by mike
3. 919 views
Gastrectomy is listed as the principle procedure on the surgical report. You know that (-ectomy) means excision or surgical
1. 2 answers
2. asked by Brenda
3. 914 views
A household bleach solution contains 5.25% (by mass) NaClO. How many moles of NaClO are needed to make 1000L of the solution?
1. 1 answer
2. asked by Staci
3. 913 views
At noon, ship A is 30 nautical miles due west of ship B. Ship A is sailing west at 18 knots and ship B is sailing north at 19
1. 0 answers
2. asked by mona
3. 899 views
Two point charges 1.5 cm apart have an electric potential energy -150 mu J. The total charge is 34 nC. what are q_1 and q_2?
1. 1 answer
2. asked by mandy
3. 899 views
verify the identity:tan^2x(1+cot^2x)=1/1-sin^2x Verify the Id: tanx + cotx/ tanx-cotx = (1/sin^2x-cos^2x)
1. 2 answers
2. asked by stacey graham
3. 859 views
The legs of an isosceles triangle are each 18 cm long and the angle between them measures 48 degrees. What is the length of the
1. 1 answer
2. asked by cori
3. 826 views
Argon makes up 0.93% by volumee of air. Calculate its solubility (mol/L) in water at 20C and 1.0 atm. Henry's law constant for
1. 0 answers
2. asked by Staci
3. 817 views
A 1100 kg automobile is at rest at a traffic signal. At the instant the light turns green, the automobile starts to move with a
1. 1 answer
2. asked by beav
3. 817 views
A 190 g basketball has a 37.3 cm diameter and may be approximated as a thin spherical shell.Starting from rest, how long will it
1. 0 answers
2. asked by Caryn
3. 814 views
The following reaction represents the decomposition for water:2H2O - 2H + O How many molecules of hydrogen are produced from the
1. 1 answer
2. asked by Stacey
3. 813 views
what are extraneous solutions of an equation? Why do they sometimes occur in the process of solving rational equations? examples
1. 1 answer
2. asked by sid
3. 802 views
uummm i want to know how can telescope cxan see so far????
1. 1 answer
2. asked by Jane
3. 795 views
Suppose a 69 kg person stands at the edge of a 7.8 m diameter merry-go-round turntable that is mounted on frictionless bearings
1. 1 answer
2. asked by Anonymous
3. 787 views
particle 1 of mass m1 = 0.29 kg slides rightward along an x axis on a frictionless floor with a speed of 1.8 m/s. When it
1. 0 answers
2. asked by beav
3. 786 views
Combustion analysis of 0.343 g of a compound containing C, H, and O produces 0.753 g of CO2 and 0.411 g of H2O. Mass spectral
1. 1 answer
2. asked by Abraham
3. 774 views
At noon, ship A is 20 nautical miles due west of ship B. Ship A is sailing west at 21 knots and ship B is sailing north at 18
1. 1 answer
2. asked by mona
3. 757 views
What are some literary devices (simile, metaphor, flashback, etc.) that are used in the song, "A whole new world" from Aladdin?
1. 0 answers
2. asked by Rainie
3. 750 views
what factors besides enfing the war in the pacific might have contributed to president Harry Truman's decision to drop the
1. 2 answers
2. asked by Gaby
3. 741 views
The patient went into cardiac arrest. The (-ac) portion of the word is a/anA. noun suffix B. plural suffix C. combining form D.
1. 1 answer
2. asked by Brenda
3. 724 views
At noon, ship A is 40 nautical miles due west of ship B. Ship A is sailing west at 16 knots and ship B is sailing north at 17
1. 1 answer
2. asked by bob dylan
3. 705 views
use a graphing calculator to obtain the graph of the function. What do you observe about its asymptotes?g(x) = 4 [x-2] / x + 1
1. 4 answers
2. asked by Hannah
3. 704 views
was nixon's presidency a success?i feel it was because he had the foreign policy and draft ? anything else i can add? can be
1. 1 answer
2. asked by bobbi
3. 701 views
· Complete the following problems (Do Not repeat the questions):1. The Monley Corporation of New Jersey has gross profits of
1. 3 answers
2. asked by cari
3. 699 views
Round each of the following numbers as specified.(a) 508.576 to the nearest hundredth ________________ (b) 508.576 to the
1. 2 answers
2. asked by Kirk
3. 697 views
A small source O of electromagnetic waves is placed some distance from a plane metal reflector M. A receiver R, moving between O
1. 1 answer
2. asked by Edwin
3. 697 views
You are on Pluto and would like to send a probe into space so that it does not fall back to the surface. What minimum launch
1. 2 answers
2. asked by Laramie
3. 693 views
he current in a 100 watt lightbulb is 0.840 A. The filament inside the bulb is 0.140 mm in diameter.a) What is the current
1. 0 answers
2. asked by elena
3. 692 views
Find an equation of the line containing the given pair of points. (-5,-2) and (-3,-1). The equation of the line in
1. 2 answers
2. asked by B.B.
3. 689 views
HiI just need help with question (ii) and (iii), i know how to work out (i) A solution is prepared by dissolving 0.2222
1. 1 answer
2. asked by Jenny
3. 688 views
You're asked to change plural medical words to the singular form. Which of the following combinations represents the correct
1. 2 answers
2. asked by Brenda
3. 672 views
PsyDAG, could you please check my post on that science experiment thing, if you have time. I posted it yesterday on here, but
1. 1 answer
2. asked by Sara
3. 663 views
HiCan sombody please help me with this problem If a soil sample contains 0.5g of iron (Fe3+) per 100g. The iron is precipitated
1. 0 answers
2. asked by Mary
3. 657 views

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