# tammy

Most popular questions and responses by tammy-
## Physics

A wheel with rotational inertia I is mounted on a fixed, fricitonless axle. The angular speed w of the wheel is inccreased from zero to w_f in a time interval T. 1: What is the average net torque on the wheel during the time interval, T? a) w_f/T b)w_f/T^2

*asked on March 25, 2007* -
## Intro to Healthcare Statistics

Discuss how statistics are generated and how statistical information is used by healthcare organizations. Explore the NC State Center for Health Statistics at the following website and discuss at least two types of statistic health information that NC

*asked on August 25, 2013* -
## Math

What did the baby buzzard say when it saw an orange in the nest I got misspelled jumbo

*asked on October 21, 2015* -
## Physics

A spring has a force constant of 100N/m and an unstretched lenght of .07 m. One end is attached to a post that is free to rotate in the center of a smooth table. The other end is attatched to a 1 kg disc moving in uniform circular motion on the table,

*asked on March 25, 2007* -
## Chemistry

consider the reaction at 298K. 2H2S(eq) + SO2-----3S(s) + 2H2O (g). Calculate Grxn under these conditions. PH2S=2atm Pso2 =1.5 atm PH2O + 0.01atm

*asked on May 1, 2015* -
## math

Emily spent 1/2 of her money at the grocery store. Then, she spent 1/2 of what was left at the baker. Next she spent 1/2 of what was left on a cd. She spent the remaining $6.00 on lunch. How much money did she start with ?

*asked on January 20, 2015* -
## stat

smith is a weld inspector at a ship yard. he knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard. If smith checks 300 of the 7500 welds completed that shift, what is the probability

*asked on April 21, 2016* -
## Physics

When a block slides a certain distance down an incline the work done by gravity is 300 J. What is the work done by gravity if this block slides the same distance up the incline? a) 300 J b) zero c) -300 J d) It cannot be determined without knowing the

*asked on March 26, 2007* -
## Physics

A ball is tossed straight up from the surface of a small spherical asteroid with no atmosphere. The ball goes to a height ewual to the asteroid's radius and then falls straight down towardd the surface of the asteroid. What forces if any act on the ball

*asked on March 26, 2007* -
## physics

A solid object floats with three-fourths of its volume beneath the surface of eater. What is the object's density? Give answers in g/cm^3. p_o=? p_object/p_water = v_water/v_object p_o/(1 g/cm^3) = ? for the volume side would it be 3/4 so that p_o/(1

*asked on December 3, 2007* -
## Physics

A spring has a force constant of 100N/m and an unstretched lenght of .07 m. One end is attached to a post that is free to rotate in the center of a smooth table. The other end is attatched to a 1 kg disc moving in uniform circular motion on the table,

*asked on March 26, 2007* -
## Organic chemistry

What are two reasons why the crude product in most reactions is not pure?

*asked on April 4, 2010* -
## Physics

When a block slides a certain distance down an incline the work done by gravity is 300 J. What is the work done by gravity if this block slides the same distance up the incline? a) 300 J b) zero c) -300 J d) It cannot be determined without knowing the

*asked on March 25, 2007* -
## Physics

An ideal massless spring is fixed to the wall at one end. A block of mass M attached to the other end of the spring oscillates with amplitude A on a frictionless, horizontal surface. The maximum speed of the block is V_m. The force constant of the spring

*asked on March 25, 2007* -
## science

A ball of mass m is attached by two strings to a vertical rod. as shown above. The entire system rotates at constant angular velocity about the axis of the rod. a)Assuming is large enough to keep both strings taut, find the force each string exerts on the

*asked on April 8, 2012* -
## chemistry

benzopinacol and benzopinacolone diferences Because benzopinacol and benzopinacolone have nearly identical melting points, describe (without using spectroscopic methods) how you might prove that samples of the two compounds are different.

*asked on November 8, 2010* -
## Math

From an 8 inch by 10 inch rectangular sheet of paper, squares of equal size will be cut from each corner. The flaps will then be folded up to form an open-topped box. Find the maximum possible volume of the box.

*asked on April 9, 2011* -
## physics

How much absolute (total) pressure must a submarine withstand at a depth of 120m in the lake. Give answer in kPa. (Use 10m/s^2 for g). h=120m p_water = 1 g/cm^3 = 1000 kg/m^3 p_atmosphere = 101.3kPa P_total = ? P_water =density *g*h =1000*10*120 =1200000Pa

*asked on December 3, 2007* -
## Middle Math

My math calculator prompted me with this question 6E-7. My answer to this question is 0.00000007

*asked on March 30, 2015* -
## Physics

Sanding block weighs 2.0 N and is pushed with a force of 3.0 N at an angle of 30.0 degrees with respect to the vertical, and angled toward the wall. Moves straight up the wall at a constant speed. What is the coefficient of kinetic friction between the

*asked on September 6, 2010* -
## O Chemistry

In the reaction p-aminophenol + acetic anhydride --> acetaminophen , 4.5 ml of water is added into the flask with the p-aminophenol and acetic anhydride at the beginning of the experiment. What is the purpose of this water?

*asked on April 4, 2010* -
## Statistics

A lottery uses 4 urns containing chips 0 to 9. One chip is selected at random from each urn. How many sample points are in the sample space?

*asked on May 22, 2012* -
## Chemistry

How many carbon atoms are there in a diamond (pure carbon) with a mass of 50 ?

*asked on September 8, 2012* -
## Physics

A bullet of mass m=0.05kg embeds itself in a block of mass M=1.2kg, which attached to a spring of force constant k=245N/m. If the initial speed of the bullet v0=1.32m/s, find the maximum compression of the spring

*asked on May 6, 2019* -
## physics

An object floats with half of its volume beneath the surface of the water. The weight of the displaced water is 2000N. What is the weight of the object? I'm confused by this problem. How would I go about solving this? My guess would be that the weight of

*asked on December 3, 2007* -
## Physics

A bike wheel rotates uniformly through 2 revolutions in 3 seconds. a) what is the period of the wheel's rotation? T=3rev/2s=1.5s b) what is the frequency of the wheel's rotation? (in Hertz) f=1/T =1/1.5 =.666Hz c) what is the angular speed of the

*asked on October 31, 2007* -
## Chemistry

In the production of carbon disulfide (CS2), carbon (C) and sulfur dioxide (SO2) are reacted. If 8.00 g of sulfur dioxide reacts, how many moles of carbon dioxide are produced?

*asked on April 26, 2016* -
## Logic

Mrs. Orlof teaches two history classes, one in the morning and one in the afternoon. Yesterday she gave the same test to both classes. Anyone who failed the test must take a retest. Since a greater percentage of students who took the morning test failed

*asked on August 12, 2012* -
## Chemistry

Can u show me how to calculate the neutron-to-proton ratio of an atom? For example: tin-134 or silver-107

*asked on April 12, 2010* -
## Physics

you lift a 10 N physics book up in the air a distance of 1m at a constant velocity of .5m/s. What is the work done by the weight of the book? a) +10 J b)-10 J c) +5 J d)-5 J 10 N is the force of gravity and to find work you do this: W=F_g(change in

*asked on October 10, 2007* -
## Physics

A 6090kg space probe mobing nose-first toward Jupiter at 105m/s relative to the Sun, fires its rocket engine ejecting 80 kg of exhaust at a speed of 253 m/s relative to the space probe. What is the final velocity of the probe? I should have gotten 108m/s

*asked on February 2, 2007* -
## Science

Calculate how much 95% ethyl alcohol will be required to dissolve 075g sulfanilamide at 78 degree Celsius. Knowing that solubility of sulfanilamide is 210 mg/ml at 78 degree Celsius, 14mg/ml at 0 Degree Celsius.

*asked on September 21, 2010* -
## Physics

A plane flying horizontally at a speed of 50m/s and at an elevation of 160m drops a package. two seconds later it drops a second package. How far apart will the two packages land on the ground? a)100m b)162m c)177m d)283m i think the answer is a) I got

*asked on September 25, 2007* -
## Algebra II

Bolivian coffee sells for $4.59 per pound, and Columbian coffee sells for $5.95 per pound. How many pounds of each coffee should be mixed to produce 4000 pounds of a mixture that will be sold for $5.10 per pound? I think this is a system of equations but

*asked on October 7, 2007* -
## Biology

If 20% of the individuals in a population have sickle-cell anemia, according to the Hardy Weinberg equation, what proportion of the population should be sickle-cell carriers?

*asked on February 24, 2019* -
## Chemistry

Among the solubility rules previously discussed is the statement: Carbonates, phosphates, borates, and arsenates—except those of the ammonium ion and the alkali metals—are insoluble. (a) Write the expression for the equilibrium constant for the

*asked on November 27, 2016* -
## Physics

A baseball is thrown from the rood of a 27.5m tall building with an initial velocity of magnitude 16.0m/s and directed at an angle of 37 degrees above the horizontal. A) Using energy methods and ignoring air resistance, calculate the speed of the ball just

*asked on March 21, 2019* -
## Physics

A man travels 7km due north,then 10km due east.find the resultant displacement.

*asked on November 5, 2013* -
## Organic chemistry

When synthesizing n-butyl bromide by allowing n-butyl alcohol to rect with sodium bromide and sulfuric acid what are the formulas for the salts that may precip. when the reaction mixture is cooled?

*asked on March 20, 2010* -
## Physics

Which of the following is an accurate statement? a) a vector cannot have zero magnitude if one of its components is not zero b) the magnitude of a vector can be less than the magnitude of one of its componenets c) if the magnitude of vector A is less than

*asked on September 19, 2007* -
## Physics

A stream of water exits from the bottom of a can and lands in a second can. The top of the second can is 0.50m below the hole in the first can, which has water in it to a depth of 0.150m. Find the distance D.

*asked on May 5, 2019* -
## physics

Water discharges from a horizontal, cylindrical pipe at the rate of 5.00x10^-3 m^3/s. At a point in the pipe where the cross-section is 1.000x10^-3 m^2, the absolute pressure is 1.60x10^5 Pa. What is the pipe radius at a constriction if the pressure there

*asked on May 3, 2019* -
## Physics

Two chunks of ice are sliding on a frictionless frozen pond. Chunk A, with a mass ma= 5.0 kg, moves with initial velocity va1= 2.0 m/s parallel to the x-axis. It collides with chunk b, which has a mass mb= 3.0 kg and is initially at rest. After the

*asked on March 23, 2019* -
## chemistry

How many joules of heat are removed to completely covert 70.0 grams of water to ice at zero Celcius?

*asked on April 11, 2016* -
## algebra

two planes which are 1695 miles apart fly towards each other,their speeds differ by 65 mph,if they pass each other in 3 hours, what is the speed of each

*asked on February 26, 2015* -
## Chemistry

Write an equation for the reaction that takes place when each base is added to water. A) LiOH B) (CH3)2NH.

*asked on July 11, 2014* -
## accounting

Would like to start a college fund. It was estimated that the cost for college to be 60,000 per year. How much should be deposit into the account each month for 18 years to accumulate a total of 240,000 @ 12% interest earned.

*asked on April 21, 2011* -
## biology

Biotechnology allows us to use living organisms or their processes for human needs or purposes. Currently, this topic includes such general examples as cloning, stem cells (adult, umbilical cord, and embryonic), DNA fingerprinting, biological warfare,

*asked on November 30, 2008* -
## Physics

A 0.500kg block of metal with an initial temperature of 30 degrees C is dropped into a container holding 1.12kg of water at 20.0 degrees C. If the final temperature of the block-water system is 20.4 degrees C, what is the specific heat of the metal? Assume

*asked on May 5, 2019* -
## Intro to Chemistry

When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. CaCO3(s)+2HCl(aq)=CaCl2(aq)+H2O(l)+CO2(g) How many grams of calcium chloride will be produced when 27.0 g of calcium carbonate are combined with

*asked on November 10, 2014* -
## Physics

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

*asked on April 18, 2019* -
## Physics

A force F is exerted by a broom handle on the head of the broom, which is of mass m. The handle is at angle theda to the horizontal. (where it's tilted towards the left at about 30 degrees to the horizonal). The work is: a)fdsin theda b)fdcos theda This

*asked on March 26, 2007* -
## Physics

A small mailbag is releassed from a helicopter that is ascending steadily at 5m/s. After 2s. a) what is the speed of the mailbag? b) how far is it below the helicopter? a) would I use v=v_0 +at v=5m/s + 9.8m/s^2(2s) v=24.6 m/s is this the correct speed of

*asked on September 19, 2007* -
## Physics

A ball is tossed straight up from the surface of a small spherical asteroid with no atmosphere. The ball goes to a height ewual to the asteroid's radius and then falls straight down towardd the surface of the asteroid. What forces if any act on the ball

*asked on March 25, 2007* -
## Physics

A .30kg softball had a velocity of 15m/s at an angle of 35 degrees below the horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball while it is in contact with the bat if the ball leaves the bat with

*asked on January 31, 2007* -
## Physics

A stone is thrown straight up. At the top of the path, the net force acting on it is (ignore air resistance) a) greater than its weight b) greater than zero, but less than its weight c) instantaneously equal to zero d) equal to its weight At the very top

*asked on October 3, 2007* -
## Analytical Chemistry

When BaCl2-H2O (s) is dried in an oven, it loses gaseious water: BaCl2-H2O BaCl2(s) + H2O (g) enthalpy change - 63.11 kJ/mol at 25 degrees C entropy change - +148 J/(K-mol) at 25 degrees C Calculate the vapor pressure of gaseous H2O above BaCl2-H2O at

*asked on October 25, 2010* -
## physics

A coil with 210 turns, a radius of 5.2 cm, and a resistance of 11 ohms surrounds a solenoid with 160 turns/cm and a radius of 4.6 cm . The current in the solenoid changes at a constant rate from 0 to 6.4 A in 0.11 s. Calculate the magnitude of the induced

*asked on May 19, 2011* -
## algebra

A 24 meters pole is held by a three guy wire into vertical position. Two of the guy wires are of equal length. The third wire is 5 meters longer than the other two and is attached to the ground 11 meters farther from the foot of the pole than the two equal

*asked on February 23, 2015* -
## Algebra

Use symbols to write the expression and then evaluate it Thirty six squared divided by six cubed The given expression symbol is? Evaluate it

*asked on September 23, 2012* -
## physics

A rectangular box of negligible mass measures 5m by 1m by .5m. How many kgs of mass can be loaded onto the box before it sinks in the water? V=5*1*.5 = 2.5m^3 density of water =1g/cm^3 =1000 kg/m^3 I also know that when the density of the mass is greater

*asked on December 3, 2007* -
## math

Susie uses 1/2 to help compare 1/3 to 3/5 and to help in comparing 3/7 with 2/3. Explain how 1/2 help determine which fraction is greater in each combination.

*asked on March 3, 2015* -
## Maths

Two cyclists depart from the same point. One travels due East at 18km/hr while the other travels North-West at 20km/hr. How long will it be before they are 80km apart?

*asked on March 15, 2011* -
## Organic Chemistry

What would happen to the caffeine if the sublimation step were performed at atmospheric pressure?

*asked on October 20, 2010* -
## chemistry

How many moles of gas must be forced into a 5.0 L tire to give it a gauge pressure of 33.6 psi at 28 ∘C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.8 psi so that the total pressure in the tire is 48.4

*asked on April 9, 2016* -
## physics

A 50kg skier pushes off the top of a hill with an initial speed of 5m/s. Neglect friction. How fast will he be moving after dropping 20m in elevation? I was wondering if i did this problem correct. PE + KE_f = KE_i mgh +1/2mv_f^2 =1/2mv_i^2 50(10)(20) +

*asked on October 17, 2007* -
## Physics

A rocket whish is in deep space and initially at rest relative to an inertial reference frame, has a mass of 2.55 X 10^5 kg of which 1.81 X10^5 kg is fuel. The rocket engine is then fired for 250 s during which feul is consumed at the rate of 480 kg/s. The

*asked on February 2, 2007* -
## Physics... Please help me! I REALLY need help.

A .30kg softball had a velocity of 15m/s at an angle of 35 degrees below the horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball while it is in contact with the bat if the ball leaves the bat with

*asked on February 1, 2007* -
## math

Mr. Jackson is preparing bags of treats to give trick or treaters on Halloween. He has 48 pieces of candy and 60 pieces of gum. He uses all the candy and gum, and he puts the same ratio of candy to gum in each bag. What is the largest number of bags he

*asked on September 30, 2008* -
## Physics

A jumper in the long-jump goes into the jump with a speed of 10m/s at an angle of 30 degrees above the horizontal. Use g=10m/s. a) how long in the air is the jumper before returning to the Earth? b) How far does the jumper jump? for a) I got .001s as the

*asked on September 25, 2007* -
## Principle of Accounting

t is stand accounting procedures, or GAAP, to make an adjusting entry to remove the current year�s principle from the long-term liabilities. This entry reduces the long-term liabilities and increases the current liabilities. You are the bookkeeper for

*asked on March 29, 2010* -
## physics

A car of mass 1500kg moves to the right along a level straight road at a speed of 25 mph. It collides directly with a stopped motorcycle of mass 150kg. What is the total momentum after the collision? p_initial = p_final m_1*v_1i +m_2*v_2i = m_1*v_1f +

*asked on October 24, 2007* -
## physics

When a cannon fires a cannonball, the cannon will recoil backward because the a) energy of the cannonball and the cannon is conserved b) momentum of the cannonball and cannon is conserved c)energy of the cannon is greater than the energy of the cannonball

*asked on October 24, 2007* -
## Physics

A target lies flat on the ground 3m from the side of a building which is 10m tall. A student rolls a ball off the horicontal roof of the building in the direction of the target. Air resistance is negligible. Te horizonal speed with which the ball must

*asked on March 25, 2007* -
## Spanish

Por or Para Tiene que terminar este proyecto (para) manana. Salio de la oficina (por) su casa. Are these sentences correct? Thanks

*asked on December 5, 2018* -
## College math

1.Find the height to the nearest foot of a tree that makes a 50-foot shadow when a 2 ft. 6 in. pole is used to make a shadow of 3 feet.

*asked on April 26, 2012* -
## Organic Chemistry

Bromination of E-Stilbene how I need to calculate the theoritical and the % yield? It was 0.20g of e-stilbene added to 10ml RBF at the end of reaction it was 0.328 gm of product messured.

*asked on October 20, 2010* -
## Physics

A jumper in the long-jump goes into the jump with a speed of 10m/s at an angle of 30 degrees above the horizontal. Use g=10m/s. a) how long in the air is the jumper before returning to the Earth? b) How far does the jumper jump? for a) I got .001s as the

*asked on September 26, 2007* -
## math

In October, a HARDWARE STORE purchased snow shovels for $8 each. The original markup was 50% based on the selling price. In December, the store had a sale and marked down the shovels by 20%. By January 1, the sale was over and the shovels were marked up

*asked on August 25, 2014* -
## Science

The biochemical conversion of Glucose, C6H12O6, into pyruvic acid, C3H4O3, is an important step in the TCA (Kreb’s) cycle which forms a part of the metabolic breakdown of glucose (to produce energy). C6H12O6 (s) + O2 (g) → 2C3H4O3(l) + 2H2O (l) glucose

*asked on October 22, 2011* -
## History

Does anyone know how to create a timeline tracking the major themes/paradigm shifts in American History. I am not sure what the format for a Timeline. Tammy

*asked on March 23, 2011* -
## Physics

A car starts from rest and accelerates at 5 m/s^2 for 4 s, then maintains that velocity for 3 seconds, then decelerates at the rate of 2m/s^2 for 3 seconds. a) what is the final speed of the car? b) how far does the car travel? a) v = v_0 +at =0+2(3)= 6m/s

*asked on September 11, 2007* -
## science

An average human heart rate is 70 beats per minute. How many times it beats over 70 year lifetime? use scientific notation. 365 = the number of days in a year 70 years /1 * 365 days / year = 25,550 25,550/1 * 24 hours/ day = 613,200 613,200/1 * 60 minutes/

*asked on September 2, 2007* -
## Physics

To streatch a certain nonlinear spring by an amount 2x requires a force F given by F=40x-6x^2 where F is in newtons and x is in meters. What is the change in potential energy when the spring is stretched 2 meters from its equilibrium position? a)16 J b)28

*asked on March 25, 2007* -
## physics

A roller-coaster car with a mass of 550 kg starts at rest from a point 46 m above the ground. At point B, it is 23 m above the ground. [Express your answers in kilojoules (kJ).] (a) What is the initial potential energy of the car? Incorrect: Your answer is

*asked on September 28, 2013* -
## Math

In a group of 37 children, 14 had a dog, 20 had a cat, and 12 had both a dog and a cat. How many children had neither a dog nor a cat as a pet? 23 8 35 15 Is the answer 15? I think it is 15

*asked on March 31, 2013* -
## Chem

if salt has the solubility product expression Ksp={Br3+}2{S2-}3 what is the equilibrium equation for the solubility?

*asked on December 3, 2011* -
## Physics

According to conservation of momentum, when two objects collide, the momentum lost by one object equals the momentum gained by the other. Give a common-sense, non-mathematical explanation of the connection between Newton’s 3rd law and momentum

*asked on March 26, 2011* -
## Physics

According to conservation of momentum, when two objects collide, the momentum lost by one object equals the momentum gained by the other. Give a common-sense, non-mathematical explanation of the connection between Newton’s 3rd law and momentum

*asked on March 28, 2011* -
## organic chemistry

The isolation process of aspirin was stopped after the filtration step with alumina and one week later the methanol was evaporated and the experiment was completed. The melting point of the aspirin was found to be 110-115 Celsius. explain why the

*asked on October 4, 2010* -
## Chemistry

The solubility of KCLO3 at 25 degree celcius is 10.9 per 100.g of h20. question: If 15 g are addded to 100 g of water at 25 degree celcius with stirring, how much of KCLO3 will dissolve? Is the solution saturated, unsaturated, or supersaturated? please

*asked on May 7, 2007* -
## Math

Lindsey has 33 coins in her change purse that are either dimes or quarters. If y represents the number of quarters she has, write an expression in terms of y that describes the number of dimes?

*asked on September 17, 2012* -
## Psychology

According to B.F.Skinner, superstitious behaviors are the result of what? Is it continuous reinforcement or accidental reinforcement?

*asked on September 24, 2008* -
## physics

How much absolute (total) pressure must a submarine withstand at a depth of 120m in the lake. Give answer in kPa. (Use 10m/s^2 for g). h=120m p_water = 1 g/cm^3 = 1000 kg/m^3 p_atmosphere = 101.3kPa P_total = ? P_water =density *g*h =1000*10*120 =1200000Pa

*asked on December 3, 2007* -
## physics

A ball of mass .3 kg is dropped from a height of 10m. Its momentum when it strikes the ground is? I know p=mv how would I find velocity for this problem? Thanks in advance for your help.

*asked on October 24, 2007* -
## Physics

After a completely inelastic collision two objects of the same mass and the same initial speed are found to move away together at 1/2 thier initial speed. Find the angle bewteen the initial velocitie of the objects? Can you please show me the step to solve

*asked on March 5, 2007* -
## algebra

If a baseball player hits a homerun and runs the bases, what is his displacement?

*asked on August 23, 2011* -
## Algebra

write a numerical expression for the phrase & simplify 129 less than -34

*asked on March 2, 2011* -
## 4th grade

What is a metaphor or simile using "A calm pond" as the subject?

*asked on November 18, 2009* -
## Physics

Does the de Broglie model assert that an electron must be moving in order to have wave properties?

*asked on April 10, 2008*