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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. 6,454 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. 4,987 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. 4,978 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. 4,592 views
Calculate the [h3o+] of the following polyprotic acid solution: 0.135 M H2CO3
1. 1 answer
2. asked by Krysten
3. 4,549 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. 3,488 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. 3,451 views
what is the conjugate base of H2SO3??
1. 1 answer
2. asked by Anonymous
3. 3,113 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. 3,069 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. 2,992 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. 2,975 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. 2,871 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. 2,765 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. 2,465 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. 2,399 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. 2,205 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. 2,133 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. 1,996 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. 1,978 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. 1,856 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. 1,767 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. 1,728 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. 1,603 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. 1,586 views
9x^2 + 16y^2 - 36x + 96y + 36 = 0 How do i find the major axis?
1. 1 answer
2. asked by mike
3. 1,516 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. 1,505 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. 1,422 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. 1,338 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. 1,336 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. 1,315 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. 1,280 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. 1,277 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. 1,271 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. 1,269 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. 1,253 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. 1,249 views
verify the identity:sec(beta)+ tan (beta)= cos(beta)/ 1-sin(beta)
1. 1 answer
2. asked by stacey graham
3. 1,245 views
how do participation contracts represent financial opportunities for providers?
1. 0 answers
2. asked by Kay
3. 1,245 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. 1,243 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. 1,172 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. 1,167 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. 1,162 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. 1,151 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. 1,145 views
what is conjugated base of NH4+
1. 1 answer
2. asked by Eric
3. 1,144 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. 1,136 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. 1,129 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. 1,124 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. 1,117 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. 1,112 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. 1,100 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. 1,090 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. 1,082 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. 1,076 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. 1,075 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. 1,070 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. 1,057 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. 1,054 views
tan(theta)=(7/24), sin(theta)<0find cos(2theta)
1. 2 answers
2. asked by stacey graham
3. 1,047 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. 1,036 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. 1,000 views
will 1 molar NH3 and 1 molar NH4Cl form a buffered solution?
1. 1 answer
2. asked by Anonymous
3. 982 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. 979 views
what two metals that will not generate hydrogen gas when treated with an acid?
1. 1 answer
2. asked by nicole
3. 977 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. 949 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. 937 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. 935 views
what is data management technology
1. 1 answer
2. asked by mike
3. 925 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. 920 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. 918 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. 907 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. 906 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. 866 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. 831 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. 826 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. 823 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. 820 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. 817 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. 809 views
uummm i want to know how can telescope cxan see so far????
1. 1 answer
2. asked by Jane
3. 800 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. 793 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. 792 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. 780 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. 762 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. 759 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. 751 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. 730 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. 713 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. 711 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. 708 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. 707 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. 703 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. 701 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. 699 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. 699 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. 697 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. 695 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. 678 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. 668 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. 664 views

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