Saturday

November 28, 2015
Total # Posts: 771

**physics**

a space probe launched from earth and orbits at a distance of 15,000 m from earth's center, the gravitational force is 500 N. What is the size of force when it is 25,000 m from earth.
*November 5, 2013*

**Physics**

A hang glider and its pilot have a total mass equal to 120 kg. While executing a 360 degree turn, the glider moves in a circle with an 8-m radius. The gliders mass is 10 m/s. a) what is the net force on the hang glider? b) What is the acceleration?
*November 5, 2013*

**Econ**

When the law of diminishing returns applies, which of the following would rise with increased employment of labor, ceteris paribus? A. Fixed costs B. Marginal cost C. Marginal revenue D. The wage rate
*November 3, 2013*

**statictics**

Either one
*October 27, 2013*

**Algebra**

1800 (x+20) 1800x + 20(1800) or 1800x + 36,000 are the expressions all equivalent? How can you determine if they are equivalent?
*October 24, 2013*

**Math**

The manager of Pine Town Furniture purchased a new copier for $28,000. She plans to keep it for four years, at which point she expects to trade the copier in and receive $6000 credit toward the purchase of a new machine. She is going to use straight-line depreciation on the ...
*October 22, 2013*

**Math**

The total cost of renting a car is a function of the basic charge, insurance, and the number of miles driven. Suppose a compact car costs $0.10 per mile plus $30 in basic charges and insurance. A mid-size car costs $50 in basic charges and insurance plus $0.10 per mile.
*October 22, 2013*

**organic chemistry**

I need help understanding how to differentiate between isomers and resonance structures in skeletal structures. Specifically, here is an image to a problem with the answers: i.imgur. com /mz3URSa.jpg (remove spaces) The left most structure is the reference structure and the ...
*October 19, 2013*

**science help!!!**

Thank you Josslyn you are the best i got 100%
*October 18, 2013*

**Chemistry**

100
*September 16, 2013*

**science**

If you have 10 lbs shrimp at 80 deg F how much ice would it take to reach 50 deg F in 10 minutes?
*August 7, 2013*

**alg**

5x-10/5 ?
*July 10, 2013*

**alg**

−(6p + 12
*July 10, 2013*

**physics**

A block is pressed against a vertical wall by a force , as the drawing shows. This force can either push the block upward at a constant velocity or allow it to slide downward at a constant velocity. The magnitude of the force is different in the two cases, while the ...
*June 30, 2013*

**physics**

Geosynchronous communications satellites are placed in a circular orbit that is 3.59 107 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?
*June 27, 2013*

**microeconomics**

The cost of producing flat-screen TVs has fallen over the past decade. Let’s consider some implications of this fact. A.) Draw a supply-and-demand diagram to show the effect of fallen production costs on the price and quantity of flat-screen TVs sold. B.) In your diagram...
*June 9, 2013*

**Pseudocode Format**

Need help writing this using pseudocode format: Carly gets paid annually, and she would like a program that will figure out the amount of money she will be receiving each pay period. To make this simpler, we are not worried about any deductions.
*May 21, 2013*

**Pseudocode Format**

Need help writing this into Pseudocode Format: Robert has a van rental company, and he wants a program that determines the total cost of renting a van from him. His customers will pay a base fee (currently set at $50), plus a charge per mile (currently $.25 a mile).
*May 21, 2013*

**Chemistry **

A certain gas has a solubility of .50 g/L under a pressure of 1500 torr. What would its solubility be a 2250 torr?
*May 6, 2013*

**Physics**

In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.
*April 20, 2013*

**Physics**

In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.
*April 20, 2013*

**Physics**

In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.
*April 20, 2013*

**Physics**

In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.
*April 20, 2013*

**Science**

Person weighing 650N lies on a bed of nails,each nail has area of 1m2 Assume 4Nm^-2 pressure is painful what is the smallest number of nails they could lay on and not be hurt
*April 9, 2013*

**Chemistry**

How many milliliters of 1.0 M NaOH must be added to 200. mL of 0.10 M NaH2PO4 to make a buffer solution with a pH of 7.50? (5 points)
*April 4, 2013*

**Math**

What is the perimeter of a trapeziod with an area of 96
*March 31, 2013*

**physics**

A boy is pushing his sled up a snowy slope. The sled has a mass of 20.4 kg and weighs 200 N. The boy pushes with a constant force of 75 N. The sled travels a distance of 10 m and gains 3 m in height. When the sled reaches the top, it is traveling 2 m/s. What is the efficiency ...
*March 27, 2013*

**Statistics**

A pharmaceutical company claims its new medication relieves painful symptoms caused by tension headaches within 15 minutes. To investigate this claim, a local health clinic conducts a study of 45 patients who suffer from chronic tension headaches. Each patient is given ...
*March 26, 2013*

**Statistics**

According to a recent pole only 21% of Americans were satisfied with the direction the U.S. is heading. To investigate the reliability of the report an independent polling organization surveyed 500 Americans and inquired as to whether or not they were satisfied with the way ...
*March 26, 2013*

**Statistics**

Assume the weights of men are normally distributed having a mean of 185 lbs and a standard deviation of 17 pounds. A. Calculate the probability a randomly selected man weights less than 225 lbs B. Approximately 72% of men’s weights exceed how many pounds. C. In a random ...
*March 26, 2013*

**Statistics**

Assume the wait time to see a cardiologist at a certain clinic are uniformly distributed between 7 minutes and 23 minutes. Calculate the probability a randomly selected patient waits at least 18 minutes to see the cardiologist. The random variable, Z, is associated with a ...
*March 26, 2013*

**Statistics**

A Manufacturer of torque converters claim only 1% of them are defective. A. Calculate the Mean number of defective converters in a shipment of 500 converters. B. Calculate the standard deviation in the defective torque converters in a shipment of 500 converters. C. Would it be...
*March 26, 2013*

**Statistics**

A Manufacturer of torque converters claim only 1% of them are defective. A. In a shipment of 12 torque converters calculate the probability exactly 2 converters are defective. B. In a shipment of 35 converters, calculate the probability at least 1 converter is defective.
*March 26, 2013*

**Statistics**

In a certain game of chance a person pays $5 to play a game. A person randomly selects 2 integers ranging from 0-99. The host of the game then uses a random number generator to select 2 integers ranging from 0-99. If the players values and hosts values agree (in any order), ...
*March 26, 2013*

**Statistics**

Use this information to calculate the mean and standard deviation of this random variable. P(x)- .25, .05, .55, .15
*March 26, 2013*

**Statistics**

A standard deck of 52 playing cards is composed of 4 suits. Each mix contains 13 cards. Jacks, Queens, and Kings are considered face cards. Assume three cards are selected without replacement. Calculate the probability of drawing two hearts, followed by a spade.
*March 26, 2013*

**Chemistry**

A solution is prepared by dissolving 571.6 g of H 2SO4 in enough water to make 1000.0 mL of solution. The solution has a density of 1.3294 g/mL. (molar mass of H2SO4 = 98.08). What is the molar concentration of the solution?
*March 24, 2013*

**chemistry**

What mass of F2 is needed to produce 116 g of PF3 if the reaction has a 77.4% yield?
*March 10, 2013*

**Pre-calculus**

Use this equation. X=t*v*cos(theta) So 2*102*cos67=79.70915021
*February 19, 2013*

**Pre-calculus**

79.70915021
*February 19, 2013*

**Statistics**

In order to compare two kinds of feed, thirteen pigs are split into two groups, and each group received one feed. The following are the gains in weight (kilograms) after a fixed period of time: Feed A: 8.0 7.4 5.8 6.2 8.8 9.5 Feed B: 12.0 18.2 8.0 9.6 8.2 9.9 10.3 We wish to ...
*February 18, 2013*

**World history**

Confucius believed that human beings are essentially A. gods. B. evil. C. good. D. sinful.
*February 9, 2013*

**chemistry**

What has the higher normal melting point: CHI3 or CHF3? The answer in the book is CHI3. So I'm assuming the answer is CHI3 because Iodine is the bigger and will form larger london dispersion forces, but isn't a stronger dipole moment formed in CHF3 because fluorine is ...
*January 16, 2013*

**Physics conceptual questions**

You have a drink that you want to cool off? You could put in 100 g of ice or 100 g of water, both at 0 degree C. Which one would be more effective in cooling your drink? Why?
*January 14, 2013*

**Math**

Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2
*January 11, 2013*

**Math**

Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2
*January 11, 2013*

**Math**

Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2
*January 11, 2013*

**Math**

9/10?
*January 10, 2013*

**SCIENCE -HELP!!**

How does the discovery of seafloor spreading help to explain the mechanism behind why plates move??
*January 8, 2013*

**Math**

If 1 and –6 are two of the roots of 6x^4 + 31 x^3 − 33x^2 − 16x + 12, then what are the other two? A. 2 and 3/2 B. -1 and 6 C. 1/2 and -2/3 D. -2 and 2/3
*December 14, 2012*

**algerbra**

If 1 and –6 are two of the roots of 6x^4 + 31 x^3 − 33x^2 − 16x + 12, then what are the other two? A. 2 and 3/2 B. -1 and 6 C. 1/2 and -2/3 D. -2 and 2/3
*December 14, 2012*

**Physics**

21) A 46 kg skater is standing still in front of a wall. By pushing against the wall she propels herself backward with a velocity of – 1.2 m /s. Her hands are in contact with the wall for 0.8 s. Ignore friction and wind resistance • Find the magnitude and direction ...
*December 4, 2012*

**Physics**

A 4 ohm resistor and 10 ohm resistor are connected in series. If this circuit is connected to a 12 V battery, how much current will flow through the circuit?
*December 4, 2012*

**college algebra--please help**

What percent of the total population is found between the mean and a z-score of -0.50?
*November 19, 2012*

**Science**

Intensity of the HeNe laser (lambda = 632nm) was measured at 2 distances: 1m and 200m from the laser. The meter reading was 10W and 1W correspondingly. How many photons/sec will enter your eye if you look into the laser from 1m? From 2m? Assume that radius of the pupil was 2....
*November 14, 2012*

**Algebra 2**

Plan A charges $5 per minute plus a one time monthly fee of $75 and plan B charges $7 per minute, plus a one time monthly fee of $25. After how many minutes will the total cost of the two equations be the same?
*November 13, 2012*

**Binomial Probability**

Before 1918, wolves were shown as 55% male, 45% female. From 1918 to present they were shown as 70% male and 30% female. In a random sample of 12 wolves, what was the probability that 6 were male? What was the probibility that 6 or more were female? What was the probability ...
*November 10, 2012*

**Sociology**

In the twentieth centruy, which country had a caste system based on race? a. India b. the USA c. South Africa d. a and b only e. b and c only
*October 29, 2012*

**Chemistry**

What does 3p have?
*October 28, 2012*

**HELP ASAP**

I need help asap!
*October 28, 2012*

**Chemistry**

What quantum numbers specify these subshells? 2s n= l= 3p n= t= 6d n= l=
*October 28, 2012*

**Chemistry**

Thanks it was correct!
*October 28, 2012*

**HELP ASAP**

I need help asap!
*October 28, 2012*

**Chemistry**

What element forms an ion with an electronic configuration of [Xe] and a –2 charge?
*October 28, 2012*

**NEED HELP**

Is it Argon?
*October 28, 2012*

**Chemistry**

Metals lose electrons under certain conditions to attain a noble-gas electron configuration. How many electrons must be lost by the element Ca? Is it 2 e^-? Which noble-gas electron configuration is attained in this process? argon radon krypton xenon helium neon
*October 28, 2012*

**Chemistry**

Assuming that the smallest measurable wavelength in an experiment is 0.330 fm (femtometers), what is the maximum mass of an object traveling at 157 m·s^–1 for which the de Broglie wavelength is observable? mass = ? kg
*October 28, 2012*

**College Chemistry**

What volume of the solution in 5a would be necessary to react completely with 23.00mL of 0.549M NH3 according to the equation: NiSO4+6NH3 -> [Ni(NH3)6]SO4 The molarity of ta is 1.667 x 10^-4M
*October 25, 2012*

**Calculus**

What is the point of inflection of the function f(x)=x^3-8x^2+5x+50? Is the local extrema at f(1/3)=50.8 max and f(5)=0 min? For the second derivative I got f(x)=6x-16 and then got x=16/6 when set to zero.
*October 24, 2012*

**Chemisty HELP ASAP**

In this problem, your answers should be mathematical expressions involving a variable. Consider an ideal gas with an absolute temperature of T1 To what temperature would you need to heat the gas to double its pressure? T2=? I got T2=2P but it is wrong
*October 17, 2012*

**Chemistry**

It is 65.4g/mol
*October 17, 2012*

**Chemistry**

P=.995atm V=.205L n=? R=.0821 Lxatm/molxk) T=298K
*October 17, 2012*

**Chemistry**

n=.0833 mols molar mass=(.0833mols/.528g)=.158g/mol
*October 17, 2012*

**Chemistry**

A 0.528 gram sample of a metal, M, reacts completely with sulfuric acid according to: M+H2SO4 -> MSO4+H2 A volume of 205 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0 Torr and...
*October 17, 2012*

**Chemistry**

T2=?
*October 17, 2012*

**Chemistry**

In this problem, your answers should be mathematical expressions involving a variable. Consider an ideal gas with an absolute temperature of T1 To what temperature would you need to heat the gas to double its pressure? T2=? I got T2=T1P times 2 but it is wrong
*October 17, 2012*

**Chemistry Answer?**

Is the answer 3.24x10^-3 g/mol?
*October 16, 2012*

**Chemistry**

A 0.528 gram sample of a metal, M, reacts completely with sulfuric acid according to: M+H2SO4 -> MSO4+H2 A volume of 205 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0 Torr and...
*October 16, 2012*

**Chemistry**

T1 is 288K but what is T2?
*October 16, 2012*

**Chemistry**

2.05 g of an unknown gas at 45 °C and 1.00 atm is stored in a 1.15-L flask. What is the density of the gas?
*October 16, 2012*

**Chemistry**

At a certain temperature and pressure, one liter of CO2 gas weighs 1.45 g. What is the mass of one liter of C4H10 gas at the same temperature and pressure?
*October 16, 2012*

**Chemistry**

Is the answer 1.85x10^6 L?
*October 16, 2012*

**Chemistry**

A hot air balloon is filled with 1.39 × 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 105 °C. What is the volume of the air in the balloon after it is heated? Assume that none of the gas escapes from the balloon.
*October 16, 2012*

**Chemistry**

An ideal gas is allowed to expand from 6.00 L to 45.0 L at constant temperature. By what factor does the volume increase? ? Number The pressure will Increase by that factor or decrease by that factor? If the initial pressure was 105 atm, what is the final pressure?
*October 16, 2012*

**Math HELPPP**

In a survey of 2000 adults 50 years and older of whom 40% were retired and 60% were pre-retired, the following question was asked: Do you expect your income needs to vary from year to year in retirement? Of those who were retired, 33% answered no, and 67% answered yes. Of ...
*October 16, 2012*

**Calculus**

What is the derivative of 7e^(3sin^(4x+5))?
*October 16, 2012*

**Calculus**

What is the derivative of 2^(5x)tan(x^2)
*October 16, 2012*

**Calculus**

What is the derivative of sin(3x+1)^4?
*October 15, 2012*

**Calculus**

Find dy/dx using implicit differentiation of xy + sin^2y=10350. Is it -y/(x+2siny)
*October 15, 2012*

**Calculus**

Dervative of cos(x) is -sin(x) so it would be negative.
*October 15, 2012*

**Math**

How do you solve this equation; There are 128 7th graders at Mark's school, if there are 16 more girls than boys, how many 7th grade boys are there?
*October 13, 2012*

**Physics**

From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 9.40 m/s and angle of 23.0° below the horizontal. It strikes the ground 5.00 s later. By how much does the ball clear or fall short (vertically) of clearing the ...
*October 12, 2012*

**Physics**

From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 9.40 m/s and angle of 23.0° below the horizontal. It strikes the ground 5.00 s later. By how much does the ball clear or fall short (vertically) of clearing the ...
*October 12, 2012*

**writing (persuasive essay)**

Hi. I'm in 10th grade and our teacher assigned us a persuasive essay to write in class over a topic that we debated about for the last two weeks. Every team had a different topics (mine was school should start from 11 am. to 5 pm), but now we're going to write a ...
*October 7, 2012*

**math**

write 718.5 in scientific notation
*October 6, 2012*

**Physics**

A swimmer, capable of swimming at a speed of 0.8 m/s in still water (i.e., the swimmer can swim with a speed of 0.8 m/s relative to the water), starts to swim directly across a 2.5 km wide river. However, the current is 0.91 m/s, and it carries the swimmer downstream.
*September 25, 2012*