# Posts by bill

Total # Posts: 937

**Chemistry**

gb

**physics**

Water is poured into a container that has a leak.The mass 'm' of the water is given as a function of time 't' by, m=5t^0.8 -3t + 20 , with t>=0, mass in grams and t in seconds A) at what time is the water mass greatest,and B) what is the greatest mass? In ...

**Physics**

The space shuttle, with an initial mass M = 2.41×106 kg, is launched from the surface of the earth with an initial net acceleration a = 26.1 m/s^2. The rate of fuel consumption is R = 6.90×103 kg/s. The shuttle reaches outer space with a velocity of vo = 4632. m/s...

**physics**

A space probe is to be put into a circular orbit of radius 42.00 km about an asteroid. At this radius the magnitude of the gravitational acceleration, normally referred to as the "gravitational field", is 1.00×10-3 meters per second squared. What speed, in ...

**help**

If BaSO4 ppt is isn't washed or dried adequately how will this effect the sulfate percent error determination?

**Chem lab**

Student Calamity reported a final yield of 50%. List four things she might have done wrong to account for this yield. Student Overachiever reported a final yield of 115%. List two things he might have done wrong to account for this yield.

**chemistry**

you have not added enough sodium hydroxide to precipitate all the copper as copper hydroxide. How could you tell that not all the copper had precipitated?

**physics**

A mass m = 6.0 kg is attached to the lower end of a massless string of length L = 27.0 cm. The upper end of the string is held fixed. Suppose that the mass moves in a circle at constant speed, and that the string makes an angle theta = 28° with the vertical, as shown in ...

**Math**

7 time 3 5 time 3 2 times 3

**statistics**

There are two companies that sell the medication, Company A and Company B. Company A’s tablets have a mean of 5 mg of medication and Company B’s tablets also have a mean amount of 5 mg of medication. This information would lead you to believe that it would make no ...

**Math**

Find the locus of points that satisfy (a) |z+1| = |z+i| (b) Re z = |z-1| and sketch them in the complex plane.

**AP Alegebra**

simplify (sqrt(x)+1)/(sqrt(x)-1)

**Physics**

just submitted the answer... to two sig figs it would be 53000 or 5.3x10^4

**math**

have 10 boxes each box contains 50 peices and we're selling for 8.00 per box. If I had to repackag them into 20 pieces each how much would I sell the repacked boxes for ? And how much for the quantity ?

**Physics**

Two charged particles are fixed on the x-axis 11 cm apart. The one on the left has a net charge of +25uc and the one on the right has a net charge of -15uc. What is the magnitude of the electric field 15 cm to the right of the negative charge? How do you solve this problem? ...

**Statistics**

E=.7624

**Math**

For a party; Mike is making an eight layer torte, which consists of eight 7-inch diameter cake layers with a cream topping on each. He knows that one recipe of cream topping will cover 55 square inches of cake. How many batches of the topping must he make to complete his torte...

**SS**

THANKS I GOT A 100% :3

**statistics**

11880

**Math**

A model plane flies 18ft per 2 seconds. What is the plane's speed in miles per hour? Round to the nearest tenths.

**Math**

Write an algebraic expression for "15 less than the product of the square of x and 5."

**CHEMISTRY**

WHAT IS THE EMPIRICAL FORMULA FOR A COMPOUND THAT HAS 200GRAMS. 97.30 GRAMS OF CARBON, 16.22 GRAMS OF HYDROGEN, AND THE REST IS OXYGEN?

**Math**

Jim paid $ 5.55 for 1 notepad and 7 pencils. Anne paid $ 12.28 for 3 notepads and 2 pencils. How much does each notepad cost? Show all work

**statistic**

Roll two 6-sided dice and examine their sum. a) How long will it take to roll "snake-eyes" (a pair of ones)? b) What is the probability of rolling a sum of 7 on the first roll? c) What is the probability of rolling a sum of 7 on the fourth roll? d) What is the ...

**College Physics**

A doubly charged ion is accelerated to an energy of 33.0 keV by the electric field between two parallel conducting plates separated by 1.70 cm. What is the electric field strength between the plates?

**math**

If a took a loan of $12000 for one year at 9.5% simple interest what would be my interest

**math**

if a took a loan out for $12000 for one year at 10% simple discount what would be my interest

**Chem**

When 100mL of 0.60mol per liter K3BO3 is added to 200 mL of 0.40 mol per liter Ca3(BO3)2 Find a)moles of K3BO b) moles of Ca(BO3)2 c)final concentration of K+ d)final concentration of Ca+2 e) final concentration of BO3 negative 3

**Chem**

In the lab a 3.3mol per liter solution was prepared by adding H2O to 140mL of a 4.3mol Per Liter solution of HCL. How much water was added?

**statistics**

a0 7

**Math**

It's actually C

**physics**

2546

**math**

factor 2x^2+7x+6=0

**Global studies**

How about you guys actully read the book and figure it out

**transportation economic**

In your own words, describe the meaning of marginal cost. You normally buy a crate of wine for $75. One crate has 6 bottles of wine. After a month, the store clerk informs you that the same crate of wine now costs $82. However, there are 7 bottles in a crate. To the nearest ...

**Math University**

This Question is very hard. I like for my son.

**biology**

if there is no oxygen for the glycolysis what process would that be called?

**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.

**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?

**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

**statictics**

Either one

**Algebra**

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

**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 ...

**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.

**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 ...

**science help!!!**

Thank you Josslyn you are the best i got 100%

**physics**

A supertanker (mass = 1.57E+8 kg) is moving with a constant velocity. Its engines generate a forward thrust of 7.47E+5 N. Determine the magnitude of the resistive force exerted on the tanker by the water. 7.47×10^5 N is correct, but i need to know how

**statistics**

Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.62 and a standard deviation of 0.43. Using the empirical rule, what percentage of the students have grade point averages that are at least 3.48? ...

**Chemistry**

100

**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?

**Chemistry**

22

**alg**

5x-10/5 ?

**alg**

−(6p + 12

**Physics**

Synchronous 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?

**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 ...

**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?

**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...

**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.

**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).

**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?

**physics**

kee

**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.

**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.

**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.

**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.

**ap chemistry**

Doctor Bob a mf savage

**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

**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)

**Math**

What is the perimeter of a trapeziod with an area of 96

**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 ...

**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 ...

**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 ...

**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 ...

**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 ...

**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...

**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.

**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), ...

**Statistics**

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

**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.

**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?

**chemistry**

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

**Physics**

35 m/s

**Pre-calculus**

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

**Pre-calculus**

79.70915021

**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 ...

**World history**

Confucius believed that human beings are essentially A. gods. B. evil. C. good. D. sinful.

**Physics**

27

**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 ...

**Cosmology**

UV

**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?

**English**

It should be Opening Statement Supporting Statements Thesis Statement And if you get stuck with that, on each of the steps, you may use the help from the writers online. I like those that work at Prime Writing service. They are 100% reliable

**Math**

Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2

**Math**

Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2

**Math**

Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2

**Math**

9/10?

**SCIENCE -HELP!!**

How does the discovery of seafloor spreading help to explain the mechanism behind why plates move??

**English Please Help**

We're these right?

**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

**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