Monday

May 2, 2016
Total # Posts: 1,913

**PHYSICS**

santa drops a package from his sleigh while traveling at constant velocity. if there is no air resistance, with the package hit the ground in front of the sleigh, behind the sleigh, or directly below it? explain reasoning.
*December 22, 2010*

**PHYSICS**

does the sun exert a gravitational force on the earth? if so, why doesn't the earth fall into the sun?
*December 22, 2010*

**PHYSICS**

assume you have a mass of 100 kg on earth. on the moon, where the gravitation of the moon is 1/6 gravitation of the earth, what is your mass on the moon and what is your weight on the moon
*December 22, 2010*

**PHYSICS**

what are the components of a vector that has a magnitude of 1.5 m at the angle of 35 degrees with respect to the positive x axis
*December 22, 2010*

**PHYSICS**

Alex is doing tight circles with his car in an empty parking lot, all the while holding his speedometer reading to a steady 20 mph. Is Alex traveling at a constant velocity? Why or why not?
*December 22, 2010*

**11th grade**

A reflecting telescope contains a mirror shaped like a paraboloid of revolution. If the mirror is 4 inches across at its opening and is 3 inches deep, where will the collected light be concentrated?
*December 16, 2010*

**physics**

as an object is dropped from a high cliff, which of the following statistics can be made in regard to the objects potential energy?
*December 16, 2010*

**physics**

A ship approaches saturn at 10.4km/s and saturns speed is 9.6km/s (relative to the sun). Take the interaction as elastic collision. Saturns mass is greater than the space ship. Find the speed of the ship after it goes around Saturn.
*December 8, 2010*

**physics**

ladder of mass m and length l leans against a frictionless wall at an angle of 60 degrees. The coefficient of static friction between the ladder and ground is 0.45. A man whose mass is 4 times the ladder climbs up. How far up the ladder can he go before he slips?
*December 8, 2010*

**economics**

what is the history on credit cards?
*December 7, 2010*

**algebra 2**

A flagpole at a right angle to the horizontal is located on a slope that makes an angle of 12 degrees with the horizontal. The pole's shadow is 16 meters long and points directly up to the slope. The angle of elevation of the sun is 20 degrees. Draw the triangle. Write an ...
*December 7, 2010*

**Advanced Physics**

If wind blows at a speed of 30 m/s over the roof of your house, what is the pressure diference on your roof between the air inside and the air outside? What net force does this produce on a roof having an area of 175 m^2? 1.3 kg/m^3 is the density of air.
*December 5, 2010*

**Geometry**

Point H is the midpoint I'd line segment GJ Line segment GH is 7x-5 HJ is 4x+1 what is the value of X?
*December 5, 2010*

**Physics**

For part c, you use the help Ewater+Eiron=the answer from part a. So this would be the set up: (4186*5*delta T)+(448*1.2*delta T)=0.7 20930delta T + 537.6delta T = 0.7 21467.6delta T = 0.7 delta T= 3.26E-5
*December 3, 2010*

**organic chemistry**

How would i construct a graph of refractive index versus percent 1-bromooctane for KI and KCl reactions
*December 2, 2010*

**trig**

Find the sign of the expression if the terminal point determined by t is in the given quadrant. cos t X sec t in any given quadrant
*December 1, 2010*

**Math**

How to solve the simultaneous equations 3x + y = 17 and y = x + 1 ?
*December 1, 2010*

**College Algebra**

ln 2+6 ln x+4 ln (x^2=8) How would I rewrite the expression? I'm struggling in Math.
*November 30, 2010*

**physics**

Suppose you roll a bowling ball at 2.5 m/s across the roof of a flat building. It leaves the edge and strikes the ground 2.0 s later. How high is the roof? How far from the edge of the roof does the ball hit the ground?
*November 28, 2010*

**physics**

Two spheres A and B, where A has twice the mas of B, are projected at the same horizontal velocity off the edge of two different height shelves. Sphere A leaves from a height of 2.0 m. Sphere B leaves a shelf 1.0 m off the floor. If both spheres leave the edge if the table at ...
*November 28, 2010*

**psychology**

Surveys suggest that up to 4% of the U.S. population suffers from generalized anxiety disorder. How are anxiety disorders viewed by various psychological perspectives such as psychodynamic, biological, cognitive, and humanistic? With which perspective do you most agree? With ...
*November 23, 2010*

**Chemistry**

If the reaction Fe2N(s) + 3/2H2(g) -> 2Fe(s) +NH3(g) comes to equilibrium at a total pressure of 1 bar, analysis of the gas shows that at 700. and 800.K, PNH3/PH2=2.165 and 1.083 respectively, if only H2(g) was initially present in the gas phase and Fe2N(s) was in excess. a...
*November 23, 2010*

**ENGLISH**

Did I use the word sublimate correctly in the following sentence? "His stories served as a way to sublimate his anger for his childhood and improve the conditions for nineteenth-century adolescence."
*November 20, 2010*

**Chem**

A chemical reaction in a bomb calormeter evolves 4.66Kj of heat. If the heat capcity of the calorimeter is 1.38 Kj/C what is the temperature change?
*November 18, 2010*

**Calc**

A 100 inch piece of wire is divided into 2 pieces and each piece is bent into a square. How should this be done in order of minimize the sum of the areas of the 2 squares? a) express the sum of the areas of the squares in terms of the lengths of x and y of the 2 pieces b) what...
*November 16, 2010*

**Physics**

A long straight horizontal segment of wire with 0.060 m traverses a west magnetic field with 2.0 T. If a south current with 4.0 A flows through the wire, which one of the following statements concerning the effect of the magnetic force on the wire is true. a) The wire will be ...
*November 14, 2010*

**Geometry**

1) Find the lengths of the legs of two possible triangles whose areas would be as close as possible to one square inch without going under. 2) What if the triangle has to be an isoceles triangle? (area must be close to one square inch) (Give answers in ruler-friendly form in &...
*November 11, 2010*

**Math**

How do you solve 3/4x+1/2y=10 and -3/2x-y=4?
*November 10, 2010*

**algebra**

what is 4p+3q=36 9p+6q=78 ?
*November 10, 2010*

**math**

Three numbers in an arithmetic sequence sum to six. If you add 1 to the first number, 2 to the second number, and 5 to the third number, the result will be a geometric sequence. What are the original 3 numbers?
*November 8, 2010*

**Math**

i need help with this problem if u know the answer coment the answer below
*November 7, 2010*

**pre-algerbra**

I have been working on this problem for an hour and a half! I keep getting 1.33 but I know that's not right!! Jim drove the 120 miles to grandmothers house in 3 hours. He increased the speed by 10 miles per hour on the way home. How long did it take him to drive home?
*November 4, 2010*

**spanish 6th grade**

o ok thank you jen
*November 1, 2010*

**spanish 6th grade**

i think it is que comida es i am not sure????
*November 1, 2010*

**Accounting**

Jan. 1 Merchandise inventory $144,200 Jan. 1–Feb. 7 Purchases (net) 40,000 Jan. 1–Feb. 7 Sales (net) 70,000 Estimated gross profit rate 40% Estimated merchandise inventory destroyed:
*October 28, 2010*

**Pre Cal**

What is the inverse of g(x)= 1/2(x-1)^3-4
*October 25, 2010*

**chemistry 101**

how much energy is released when 10 g of steam at 100 degrees celsius is condensed and cooled to body temperature?
*October 24, 2010*

**Finance**

Find the least amount that could be deposited in a bank account today at 10% compounded quarterly to allow $650 withdrawals at the end of each quarter for 8 years?
*October 20, 2010*

**Finance**

Gretta wants to retire in 13 years. At that time she wants to be able to withdraw $12,500 at the end of each 6 months for 10 years. Assume that money can be deposited at 12% per year compounded semiannually. What exact amount will Gretta need in 13 years?
*October 20, 2010*

**Finance**

A 46-year-old man deposits a total of $2000 per period in an IRA until age 65. How much money will be in the account if the interest rate is 10% compounded semiannually with payments made at the end of each semiannual period?
*October 20, 2010*

**Chemistry**

The Bohr model stops representing correct atomic structure when? Why? What does this mean for remaining atoms? How does Bohr's model relates to the periodic table?
*October 19, 2010*

**Chemistry**

A solution is labeled as ~8M NaOH. How many mL of this solution would be needed to prepare 750mL of a ~0.2M NaOH solution?
*October 19, 2010*

**physics**

A 120 N child is in a swing that is attached to ropes 2.20 m long. Find the gravitational potential energy of the child-Earth system relative to the child's lowest position at the following times. (a) when the ropes are horizontal (b) when the ropes make a 29.0° angle ...
*October 18, 2010*

**Chemistry**

Mercury and bormine react with each other to produce mercury(II)bromide: Hg + Br2 -> HgBr2 a) What mass of HgBr2 can be produced from the reactiion 10g HG and 9g Br2? [the part that really confuses me] What mass of which reagent is left unreacted? b) What is the mass of ...
*October 17, 2010*

**calculus**

Regard y as the independent variable and x as the dependent variable and use implicit differentiation to find dx/dy. y sec(x) = 9x tan(y)
*October 17, 2010*

**english**

How do the characters, plot, and theme of The Great Gatsby support or refute the statement that "the Jazz-Age society was a bankrupt world, devoid of morality, and plagued by a crisis of character"?
*October 17, 2010*

**7th grade**

where do you add parenteses to get 6+6/6+6*6=6
*October 13, 2010*

**chemistry**

what was the answer to the least accurate balance??
*October 11, 2010*

**Physics**

What average force is needed to accelerate a 8.00-gram pellet from rest to 135 m/s over a distance of 0.800 m along the barrel of a rifle?
*October 11, 2010*

**Physics**

What average force is required to stop an 1600 -kg car in 8.0 s if the car is traveling at 80 km/h?
*October 11, 2010*

**physics**

What force is needed to accelerate a child on a sled (total mass = 65.0 kg) at 1.75 m/s^2
*October 11, 2010*

**2nd grade**

If the number is less than 70 and greater than 60, the tens digit has to be 6. Now, if the ones digit is half the tens digit, divide 6 in half. The answer is 63.
*October 11, 2010*

**4th grade**

parallelogram or square
*October 10, 2010*

**english**

Its personification It is not all for of them.
*October 8, 2010*

**Pre-calc**

The question is solve for cosx= 0.60 on the interval [0,2pi). The answer is to be posted in radians. I don't understand how to find the answer.
*October 7, 2010*

**Chemistry**

The specific heat of toluene (C7H8), is 1.13 J/g•K. How many kJ of heat are necessary to raise the temperature of 61.0 g of toluene from 15.0 °C to 37.2 °C?
*October 7, 2010*

**earth**

A helicopter is ascending vertically with a speed of 4.00 m/s. At a height of 185 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?
*October 4, 2010*

**7th grade**

i don't kow how to sole this equation 5x-10=2x-7 can u help me
*October 1, 2010*

**Chemistry**

calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n=7 to n=1. Is it just 6? or how do I do this?
*September 27, 2010*

**Physics**

A shotputter throws the shot with an initial speed of 15.6 m/s at a 38.0 angle to the horizontal. Calculate the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 2.15 m above the ground.
*September 27, 2010*

**Physics**

A tiger leaps horizontally from a 5.8m -high rock with a speed of 3.6 m/s. How far from the base of the rock will she land?
*September 27, 2010*

**Physics**

A diver running 2.4 m/s dives out horizontally from the edge of a vertical cliff and 2.6 s later reaches the water below. The hieght of the cliff is 33 m. My question is: How far from its base did the diver hit the water?
*September 27, 2010*

**physics**

A diver running 2.4 m/s dives out horizontally from the edge of a vertical cliff and 2.6 s later reaches the water below. How high was the cliff?
*September 27, 2010*

**chemistry**

what is the mass of 1.22x10^23 molcules of carbon dioxide(co2) and silicon dioxide(Sio2)?
*September 20, 2010*

**chemistry**

44 g/mol
*September 20, 2010*

**chemistry**

what is the mass of 1 mole of carbon dioxide (CO2), and silicon dioxide (SIO2)?
*September 20, 2010*

**physics**

A ball is thrown upward from the ground with an initial speed of 26.2 m/s; at the same instant a ball is dropped from rest from a building 14 m high. After how long will the balls be at the same height?
*September 19, 2010*

**science**

_____ contain a fuel, rods to control nuclear reactions, and a cooling system. Would Nuclear reactor work??
*September 19, 2010*

**General Chemistry**

A certain protein was found to have 0.855% zinc by mass. Determine the minimum molecular mass of the protein. How do I go about solving this?
*September 19, 2010*

**physics**

A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.3 later. If the speed of sound is 340 , how high is the cliff?
*September 17, 2010*

**Geometry**

Find the requested angle. The supplement of 135°.
*September 15, 2010*

**Geometry**

Glenda wants to glue glitter over a piece of felt shaped like a parallelogram with a height of 36 in. and a base of 46 in. If the glitter costs $1.20 per ft2 to cover the felt, how much will it cost to cover the felt? A) $55.20 B) $1987.2 C) $165.60 D) $13.80
*September 15, 2010*

**algebra **

CORRECTION LIST THE ELMENETS OF A AND B NOT A UNION B
*September 8, 2010*

**algebra **

if A= {xlx is odd} amd B={xlx>7} list the elements of A union B
*September 8, 2010*

**math**

7(3x+6)=11-(x+2)
*September 1, 2010*

**English**

I had to write five sentences in which I used 5 different tenses. Here is what I wrote: Education helps financial planning by giving basic skills needed for better jobs and higher wages. (Present) Education will help financial planning by giving basic skills needed for better ...
*August 26, 2010*

**math**

what's the expression for 6p-16 if p=3?
*August 23, 2010*

**business ethics**

How do most U.S manufacturers montor their factories for compilance with corporate codes of conduct? a. by applying an internal audit system b. by using the services of an independent NGO c. by hiring the for-profit services of a consulting or audit firm d. by inviting a ...
*August 13, 2010*

**College physics**

What is the effect of inserting a ferromagnet inside a winding coil where current flows? The effect is to Fill in the Blank 01 (increase/decrease) the magnetic field inside the coil compared to the field that would have been produced in free space. This also Fill in the Blank ...
*July 28, 2010*

**College physics**

According to Newton's Third Law, for every action there is an equal an opposite reaction. If the current on the wire is such so that the magnetic force on the wire points upward, what must be true? 1. There is no force on the magnet. All forces act on the wire to keep the ...
*July 26, 2010*

**English?**

In the book Andromeda Strain, where is Vandenberg Air Force Base located?
*July 25, 2010*

**algebra**

27 5/3 divided by 21 1/3 The answer sheet said 81. How do you get this?
*July 23, 2010*

**College physics**

A toy car has a mass of 120g, including two 1.5 V batteries connected in series. Suppose the motor that drives the car is 80\% efficient (i.e., 80\% of the electric energy goes to the drive wheels, 20\% is dissipated as heat) and that friction and air resistance are negligible...
*July 17, 2010*

**college physics **

An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.3×10^7 m/s. What was the electron's speed as it left the negative plate? the voltage is 650V and the charge of q1 is 1.7*10^-9 and the charge of q2 is -1.7*10^-9
*July 15, 2010*

**Chemistry**

Many analytical instruments require liquid nitrogen. While filling an instrument with liquid nitrogen, an analytical chemist slips and spills the contents of the dewer, 29.0 L, onto the floor. Since the boiling point of liquid nitrogen at 1.00 atm is 77.4 K, all the nitrogen ...
*July 14, 2010*

**Chemistry UPDATED QUESTION**

A sample of air contains 78.08% nitrogen, 20.94% oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 35 degrees C and 1.00 atm? Gases to solve for: N2, O2, CO2, and Ar
*July 14, 2010*

**Chemistry**

I'm sorry, that should read 78.08% nitrogen
*July 14, 2010*

**Chemistry**

A sample of air contains 78.8% nitrogen, 20.94% oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 35 degrees C and 1.00 atm?
*July 14, 2010*

**physics**

Two cars, one in front of the other, are traveling down the highway at 25 m/s. The car behind sounds its horn, which has a frequency of 500 Hz. What is the frequency heard by the driver of the lead car? (vsound = 340 m/s). I have the answer but I just don't know how to get...
*July 12, 2010*

**Physics**

The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a total distance of 10.0 cm, what is its maximum speed when the engine is running at 3 000 rpm? The answer is 15.7 m/s but I don't understand how to get...
*July 9, 2010*

**business ethics**

how do most US manufacturers monitor their factories for compliance with corportate codes of conduct?
*June 30, 2010*

**english**

what are the metaphors used in old ironsides poem
*June 26, 2010*

**freshman english**

What are some rhetorical methods of developing a topic?
*June 20, 2010*

**Physics**

What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1000g at a radius arm of 15.0cm?
*June 8, 2010*

**Physics**

At what speed will a car round a 52-m-radius curve, banked at a 45 degree angle, if no friction is required between the road and tires to prevent the car from slipping? (g=9.8m/s^2)
*June 8, 2010*

**College Physics**

A point on a rim of a 0.15-m-radius rotating disk has a centripetal acceleration of 5.0 m/s^2. What is the angular speed of a point 0.075 m from the center of the disk?
*June 8, 2010*

**Physics**

A 3.0-m rod is pivoted about its left end. A force of 6.0 N is applied perpendicular to the rod at a distance of 1.2m from the pivot causing a CCW torque, and a force of 5.2N is applied at the end of the rod 3.0m from the pivot. the 5.2N is at an angle of 30 degrees to the rod...
*June 8, 2010*

**wgu**

How did the moon landing help to change the way scientists understand an aspect of the natural world.
*June 8, 2010*

**english 3**

In olaudah equiano's "The Middle passage" what was his greatest fear when he boarded the ship
*June 3, 2010*

**english 3**

is fear an emotion
*June 1, 2010*