# Posts by DiANA

Total # Posts: 910

**Math**

There are four tests in a year. The first test is worth 26%, the second is worth 20%, the third test is worth 30%, and the fourth test is 20%. Maria received a 59% on her first test. To receive a final mark of 65%, what is the minimum she needs to obtain on each test? Can ...

**Algebra 2**

Which one is a rule for the nth term of an arithmetic sequence with a8 = 56 and d = 5?

**Chemistry**

The mass of S-34 is greater than the mass of S-32

**Chemistry**

A current of 0.80 A was applied to an electrolytic cell containing molten CdCl2 for 2.5 hours. Calculate the mass (in grams) of cadmium metal deposited. [Enter only numbers in the blank.]

**Chemistry**

Calculate the cell emf (in volts) for the following reaction at 25°C: Ni(s) + 2 Cu2+(0.010 M) → Ni2+(0.0010 M) + 2 Cu+(1.0 M) [Enter only the number of your answer.] Answer

**Chemistry**

How many hours will it take to produce 78.0 g of Al metal by the reduction of Al3+ in an electrolytic cell with a current of 2.00 Amperes? [Enter only a number for your answer.]

**Chemistry**

Consider an electrochemical cell based on the following cell diagram: Pt | Pu3+(aq), Pu4+(aq) || Cl2(g), Cl−(aq) | Pt Given that the standard cell emf is 0.35 V and that the standard reduction potential of chlorine is 1.36 V, what is the standard reduction potential E&...

**Math**

Six girls each invited a date to the Sadie Hawkins dance. Before they joined in the fun, each couple worked in a different booth. The booths were Popcorn Sales, Marriage, Hayrides, Old Time Photos, Lemonade, and Raffle Tickets. Grab your partner and go round and round with ...

**statistics in psych**

mouradian (2001) surveyed college students selected from a screening session to include tow groups a) perps b) comparisons...

**history**

what three things did roosevelt say the country had to do to turn the economy around?

**science**

an air sample contains 0.046% CO2 if the total pressure is 760mmHg what is the partial pressure of CO2

**Physics**

A particle travels horizontally between two parallel walls separated by 18.4 m. It moves toward the opposing wall at a constant rate of 9.8 m/s. Also, it has an acceleration in the direction parallel to the walls of 3.7 m/s2.At what angle with the wall will the particle strike...

**Math**

lisa cut a log into 4 pieces in 6 minutes. she then cut a smaller log into 8 pieces. how long should the job have taken if she worked at the same rate she had worked when cutting the first log? show all work and prove your answer.

**Algebra.**

9a-1+8c-8a+c

**chemistry**

HOw many calories of heat were produced by the reaction of 10ml water with the powder of two compartments (2x3.23 g) of the heater?

**Physics**

An object with mass m1 = 6.00 kg, rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2 = 8.0 kg, as shown in the figure below. Find the acceleration of each object and the tension ...

**Physics**

Two blocks each of mass m = 4.10 kg are fastened to the top of an elevator as in the figure below. (a) If the elevator accelerates upward at 1.6 m/s2, find the tensions T1 and T2 in the upper and lower strings. T1 ? N T2 ? N (b) If the strings can withstand a maximum tension ...

**Physics**

A 520 N cat burglar is supported by cables in the figure below. Assume the angle θ of the inclined cable is 32.0°. Find the tension in each cable. (Inclined, vertical, and horizontal)

**Physics**

A 2.90 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 2.23 m in 1.90 s. (a) Find the magnitude of the acceleration of the block. (b) Find the coefficient of kinetic friction between the block and the incline. (c) ...

**Physics**

A box slides down a 36° ramp with an acceleration of 1.05 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.

**Physics**

A 2.90 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 2.23 m in 1.90 s. a) Find the magnitude of the acceleration of the block. (b) Find the coefficient of kinetic friction between the block and the incline. (c) ...

**Physics**

A block with a mass 4.0 kg is held in equilibrium on an incline of angle θ = 42° by a horizontal force F. a)Find the magnitude of the normal force. b) Find the magnitude of F. (Ignore friction.)

**Physics**

using this formula i got 8.42, which is not the right answer

**Physics**

A box slides down a 36° ramp with an acceleration of 1.05 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.

**Physics**

A 10 kg box is pulled across the floor at a constant velocity of 3.0m/s. If the box is pulled with a force of 40 N, what's the size of the frictional force between the box and the floor?

**physics**

A car starts from rest and travels along a circular track with a radius of 55.0 meters. The car starts out at a position due East of the center of the track, heading due North initially around the track, which is counterclockwise. The car increases its speed by 105 m/s every ...

**physics**

A 7000 kg helicopter accelerates upward at 0.70 m/s/s while lifting a 1000 kg car to a mountaintop for a TV commercial photo shoot. -What tension must the cable be able to withstand without breaking?

**Physics**

A car starts from rest and travels along a circular track with a radius of 55.0 meters. The car starts out at a position due East of the center of the track, heading due North initially around the track, which is counterclockwise. The car increases its speed by 105 m/s every ...

**Physics**

A 10 kg box is pulled across the floor at a constant velocity of 3.0 m/s. If the box is pulled with a force of 40 N, what is the size of the frictional force between the box and the floor?

**english homework**

I have to write a letter....and i kinda suck at writing letters.... A national television station recently broadcast a programme about the town/city where you live. You found the information in the programme badly represented the area and you have decided to write to the ...

**algebra**

the officejet printer can copy maria's dissertation in 18 min. The laserjet printer can copy the same document in 22 min. If the two machines work together, how long would they take to copy the dissertation?

**Physics**

Since it's constant, the net force is 0?

**Physics**

A 20.0 kg crate is pushed across a rough floor for a distance of 90.0 cm. When the force pushing the block is equal to 80.0 N and applied at an angle of 18.0 below horizontal to the block, the block moves at a constant speed of 2.10 m/s. What is the net force on the object?

**Physics**

A 20.0 kg crate is pushed across a rough floor for a distance of 90.0 cm. When the force pushing the block is equal to 80.0 N and applied at an angle of 18.0 below horizontal to the block, the block moves at a constant speed of 2.10 m/s.

**psych**

what are the psychoanalytic models? How have these models been used to explain human behavior? Which models do you feel is the most effective explaining human behavior and why?

**Business Communication**

#11 B

**psych**

what does it mean to be empirical in the pursuit of knowledge? how dies this relate to the scientific method?

**soil mechanics**

a large soil sample obtained from a borrow pit has a wet mass of 26.50kg. the in place volume occupied by the sample is 0.013 m3. a small portion of the sample is used to determine the water content; the wet mass is 135g, and after drying in an oven, the mass is 117g. a) ...

**Chemistry**

Calculate the amount of water (in grams) that must be added to (a)5.00 g of urea (NH2)2CO in the preparation of a 16.2 percent by mass solution, and (b)26.2g of MgCl2 in the preparation of a 1.5 percent by mass solution.

**Chemistry**

Explain why ethanol is not soluble in cyclohexane. Also, how do you figure out whether something is polar or nonpolar?

**chemistry**

In the course of research, a chemist isolates a new compound with an empirical formula C3H3O2. 4.97 g of the compound when dissolved in 100. g of water produces a solution with a freezing point of −0.325°C. What is the molecular formula of the compound? (For water, ...

**Chemistry**

Consider a 0.70 M solution of Al(NO3)3 in water. What is the nitrate ion concentration in this solution, in units of moles/L?

**chemistry**

A solution that contains 55.0 g of ascorbic acid (Vitamin C) in 250. g of water freezes at −2.34°C. Calculate the molar mass (in units of g/mol) of the ascorbic acid. Kf of water is 1.86°C/m.

**chemistry**

What mass of water (in grams) is needed to dissolve 28.7 g of ammonium nitrate NH4NO3 in order to prepare a 0.452 m (molal) solution?

**statistics**

heights of young adult u.s women are approximatelynormal with mean 64 inches and standard deviation 2.7 inches. What proportion of all u.s. young adult women are taller than 6 feet?

**Science**

Why do scientists use experimental design?

**math**

Complete the following ordered pairs for the equation. 4x+5y=-22(_, -2) (2, _)(7, _)

**college**

i need help to get started with this assignment?

**Business Communication**

So, is A the correct answer

**Business Managment**

Whats the correct answer B or D

**principles of chemistry**

i don't know the answer

**psych**

thanks again ms. sue! you're the best:)

**psych**

Can you tell me if I have this right? Are the major schools of psych? Structuralism, Behaviorism, Functionalism, Psychoanlysis, and Humanism? Just want to make sure I have the right ones. Thank you

**psych**

thank you once again!

**psych**

how does psych as a scientific discipline differ from casual observations we make in the world in everyday life? what are the similarities? Thanks

**Accounting**

o What are the advantages of the four different special journals? When would you use each type?

**college math**

A student makes a 10.50 purchase at the bookstore with a $20.00 bill. The store has no bills and gives the change in quarters and fifty-cent pieces. There are 30 coins in all. How many of each kind are there?

**college**

The preimeter of a retangle is 98. The length is 7m more than twice the width. Fid the dimension?

**math**

of a radio show. Each commercial is either 30 seconds or 60 seconds long. If the total comercial time during 1 hour is 13 min, how many 30-second commercials were played that hour? How many 60-second commercials?

**National Security policy**

What role should American's ideals play in it's National security policy history,current, hypothetical cases

**math**

1. Consider the following equation. xy + 7x + 5y = –8 (a) Differentiate both sides with respect to x to complete the following. ( blank )y ' + y + blank =0 (b)Solve for y ' in terms of x and y. (c) Calculate dy/dx at the point (4,-4). Can anyone help me on this ...

**Math**

Thank you!

**Math**

thank you, But what if the product is something other than -1 Could it still be perpendicular? Why or Why not?

**Math**

How can you determine if two lines are perpendicular?

**science**

First, watch the video, than decide which side you are are more inclined to. Either conservation or preservation, and tell why you chose the one you did. (defend your position)

**math**

No, in order to have a different number of marbles in each of the boxes you would need at least 55 marbles.

**Science (evolution)**

Thank you, they were helpful.

**Science (evolution)**

Well so far I found that fossils support his theory, also I have found that a fish study also supports this. I must find two with resources that support this. Although I have already found two, I was wondering if you or anyone else had any ideas?

**Science (evolution)**

Given Darwin’s Theory of Evolution, what scientific evidence best supports evolution by natural selection?

**Math**

Thank you again! :0)

**Math**

What is the difference between domain and range?

**Algebra**

Thank you.

**Math**

Thank you! :0)

**Math**

Thank you. Are there not any linear equations that do not have a slope? What would they be called?

**Math**

Are all linear equations functions? Why or why not?

**History**

its a question for a penn foster test ( early faces of western art )

**Algebra**

Thanks

**Algebra**

If you replace the equal sign of an equation and put an inequality sign in its place, is there ever a time when the same value will be a solution to both the equation and inequality?

**science**

what is it because i am in year 7 and if I do not have it I will get 1 hour det

**Philosophy**

I figured it out thanks anyway. =0)

**Philosophy**

My text explains the answer to this question, however I do not understand the answer. Instead of posting the entire text I was wondering if anyone could explain this to me in Laymans terms. Thanks. How did financial considerations and the international market affect the pre-...

**chemistry**

Thank you anonymous and DrBob222!

**chemistry**

What is the volume of 45.0g of nitrogen monoxide, NO, at 20 C and a pressure of 740 mm Hg? Please someone can check my work is right or not? NO = 14 + 16 = 30 54.0g / 30 = 33.60 L 273K/293K = 0.932 atm 740 mm Hg = 740 torr = 0.974 atm 33.60L x 0.932 x 0.974 = 30.50 L Answer; ...

**chemistry**

Thank you so much both of you. It really help me to understand. :)

**chemistry**

How many milliliters of NH3 (at STP) are needed to react with 45.0 mL of NO2 (at STP) according to the equation. Can someone please... help me? 8NO2 (g) + 6NH3 (g) --> 7N2) (g) + 9H2O (g) IS this help? a) 45.0 mL b) 27.5 mL c) 33.8 mL d) 60.0 mL

**chemistry**

How many milliliters of NH3 (at STP) are needed to react with 45.0 mL of NO2 (at STP) according to the equation. Can someone please... help me? a) 45.0 mL b) 27.5 mL c) 33.8 mL d) 60.0 mL

**chemistry**

Someone can help me please? A gas sample weighing 0.528 g is collected in a flask having a volume of 126 mL. At 75 degrees celcius the pressure of the gas is 750 torr. The molecular mass of the gas is closest to which one of the following? PV=nRT Thanks, DrBob222

**chemistry**

Someone can help me please? A gas sample weighing 0.528 g is collected in a flask having a volume of 126 mL. At 75 degrees celcius the pressure of the gas is 75 torr. The molecular mass of the gas is closest to which one of the following?

**chemistry 1**

it should be 2C4HO + 8O2 - > 8CO2 + H20

**CHEMiSTRY**

THANK YOU ! ( :

**CHEMiSTRY**

what is the relationship between the pressure of a gas and the absolute temperature when the volume is kept constant ?

**math**

3 + 13 = 16

**math**

pentagon * A pentagon has five sides .

**chemistryy**

thanks .

**chemistryy**

what is the relationship between the pressure of a gas and the absolute temperature when the volume is kept constant ?

**history**

What was the cause of the Panic of 1837? It means the same as too many people buying too much land with too little collateral.

**American Government**

if there is collision between the president and congress,can congress restain the president in foreign policy making?

**math**

do i have to multiply or divide?

**math**

sin 190 over 20 equals sin 47 over x.

**CHEMISTRY**

TO WHAT SPEED MUST AN ELECTRON BE ACCELERATED FOR IT TO HAVE A WAVELENGTH OF 3.0CM?