Thursday

September 18, 2014

September 18, 2014

Total # Posts: 129

**chemistry**

at a temperature of 5 celsius, 21.5 mg of a non electrolyte is dissolved in enough water to make a 150.0 ml solution. the osmotic pressure of the solution is 0.200 atm. what is the molar mass of the substance dissolved
*September 8, 2014*

**Math**

In the number 7,725, which places contain digits where one digit is ten times as great as the other?
*August 14, 2014*

**Math**

You pay 3.3 cents per minute for long-distance phone calls on your phone. Your phone bill is $3.40. Write and solve an equation to find the number of minutes m of long-distance calls you made. A. ; 103 minutes B. ; 11 minutes C. ; 83 minutes D. ; 10 minutes
*April 23, 2014*

**business**

Mr . X calls your office to see your employer, who has forgotten about the appointment and is now lunching at his club with an important overseas client. How would you deal with the situation?
*March 15, 2014*

**Help! - Writeacher!!**

Help!! Can you check my answers? 1. The small boat was scudding into the open sea with a full sail. (1 point) getting stuck sinking deeply moving swiftly* rocking harshly 2. As an outdoor enthusiast, Kristina abhorred the fact that people left debris along the hiking trail. (1...
*March 12, 2014*

**project management**

explain ES=5, LF=5, SL=O
*August 23, 2013*

**Chemistry**

I'm not getting the correct answers, sorry. Can you expand on the explanations?
*June 21, 2013*

**chem**

Here's my work, but it wasn't the correct answer: The two half-reactions: Fe3+ + e- --> Fe2+ E = 0.77 V 2H+ + 2e- --> H2 E = 0 V You multiply the first one by 2, so it looks like the formula above: 2 Fe3+(aq) + H2(g) 2 Fe2+(aq) + 2 H+(aq). Ecell = 0.77 V lnKsp...
*June 21, 2013*

**chem**

Determine the equilibrium constant for the following reaction. 2 Fe3+(aq) + H2(g) 2 Fe2+(aq) + 2 H+(aq)
*June 21, 2013*

**Chemistry**

I did the same thing for part b: Flipped the E for the lesser value (Fe half reaction) 0.80 - 0.771 = 0.029, but it wasn't correct.
*June 21, 2013*

**university of the south pacific**

at high noon, the sun delivers 1000w to each square meter of a blacktop road.if the hot asphalt transfers energy only by radiation, what is it's steady-state temperature?
*May 30, 2013*

**chemistry**

sorry that ssupposed to say 320 K
*April 6, 2013*

**chemistry**

If 22.0 of gas has a volume of 0.22 at 320 , what is its pressure in mmHg?
*April 6, 2013*

**Dynamics**

It takes 16s to raise a 2800lb car and the supporting 650lb hydraulic car-lift platform to a ht of 6.5 ft. Knowing that the overall conversion efficiency from electric to mechanical power for the system is 82% determine a) the average power output delivered by the hydraulic ...
*February 22, 2013*

**math**

show me how to do 400 divided by 43.18=
*November 19, 2012*

**science-please help due first thing tommorw**

the same alkali(sodium hydroxide)can be found in both hair gel and oven cleaner.explain why it is safe to put hair gel on your skin, but not on oven cleaner. plz help!Be as acurate as possible and it has to be an outstanding scientific explanation.
*November 8, 2012*

**Physics**

A collapsible plastic bag contains a glucose solution. If the average gauge pressure in the vein is 1.21 103 Pa, what must be the minimum height h of the bag in order to infuse glucose into the vein? Assume the specific gravity of the solution is 1.03.
*November 7, 2012*

**Physics**

Suppose a distant world with surface gravity of 7.12 m/s2 has an atmospheric pressure of 7.48 104 Pa at the surface. (a) What force is exerted by the atmosphere on a disk-shaped region 2.00 m in radius at the surface of a methane ocean?________N (b) What is the weight of a 10....
*November 7, 2012*

**Physics **

An inventive child named Chris wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley, Chris pulls on the loose end of the rope with such a force that the spring scale reads 265 N. Chris’s...
*October 22, 2012*

**Physics**

007 (part 1 of 2) An elevator accelerates upward at 1.2 m/s2. The acceleration of gravity is 9.8 m/s2 . What is the upward force exerted by the floor of the elevator on a(n) 92 kg passenger? Answer in units of N 008 (part 2 of 2) If the same elevator accelerates downwards with...
*October 22, 2012*

**Physics **

An elevator accelerates upward at 1.2 m/s2. The acceleration of gravity is 9.8 m/s2 . What is the upward force exerted by the floor of the elevator on a(n) 92 kg passenger? Answer in units of N
*October 22, 2012*

**Math Statistics**

Czarina is working part time at a pastry shop baking cupcakes. If she works for 30 hours in one week on the average, how many hours a day does she work if she works 5 days a week?
*October 19, 2012*

**Math Statistics**

What is the difference between "weighted mean" and "arithmetic mean?"
*October 19, 2012*

**Math Statistics**

Czarina is working part time at a pastry shop baking cupcakes. If she works for 30 hour in one week on the average, how many hours a day does she work?
*October 19, 2012*

**Math**

The average height of Al, Anne, and Allan is 66 inches. If Arnel is included in the group, their average height becomes 70 inches. How tall is Arnel?
*October 17, 2012*

**Math**

7 days
*October 17, 2012*

**Physics **

After a day of testing race cars, you decide to take your own 1502.5 kg car onto the test track. While moving down the track at 11.4 m/s, you suddenly accelerate to 30.2 m/s in 19.2 s. What average net force have you applied to the car during that time?
*October 15, 2012*

**Physics**

b) If the car is moving much faster than the heavier truck when they collide, what best describes the size (or magnitude) of the forces between the car and the truck? 1. Not enough information is given to pick one of these answers. 2. Neither exerts a force on the other; the ...
*October 14, 2012*

**Physics**

Consider the collisions between a car and a truck whose weight is much heavier than the car (M ≫ m). Friction is so small that it can be ignored. If they are both moving at the same speed when they collide, what best describes the size (or magnitude) of the forces ...
*October 14, 2012*

**Math**

assume 8 males audition, one of them being Miles, 6 females audition, one of them being Jackie, and 4 children audition. The casting director has 3 male roles available, 1 female role available, and 2 child roles available. How many different ways can these roles be filled if ...
*September 10, 2012*

**AP Biology**

Damaraland mole-rats are relatives of naked mole-rats. In their clans, too nonbreeding individuals of both sexes cooperatively assist one breeding par. Even so, breeding individuals in wild Damaraland mole-rat colonies usually are unrelated, and few suboordianes move up in the...
*September 3, 2012*

**Science**

Why is it that you cannot use the largest objective for some slides?
*August 19, 2012*

**Science**

When you are focusing an object under the microscope, explain why some parts are in focus and some part are out of focus?
*August 18, 2012*

**Algebra**

(6y)/(y^2+y-72 divided by (y^6)/(8-y).
*August 13, 2012*

**physics**

What is the wavelength of an electron moving at 2.60% of the speed of light? 1 m
*May 29, 2012*

**physics**

TV-reception antennas for VHF (channels 2 through 13) are constructed with cross wires supported at their centers, as shown in Figure 23.24. The ideal length for the cross wires is one-half the wavelength to be received, with the more expensive antennas having one for each ...
*May 29, 2012*

**physics**

Electromagnetic radiation having a 12.0 µm wavelength is classified as infrared radiation. What is its frequency? 1 Hz i got 1.31e+13???
*May 29, 2012*

**physics**

Got it!
*May 29, 2012*

**physics**

Citizen's band (CB) radio utilizes frequencies between commercial AM and FM. What is the frequency of a 11.34 m wavelength CB channel? 1 MHz How do you solve for MHz
*May 29, 2012*

**physics**

oh its 11.7! got it thank you!
*May 29, 2012*

**physics**

12 didnt work
*May 29, 2012*

**physics**

(a) Two microwave frequencies are authorized for use in microwave ovens: 900 and 2560 MHz. Calculate the wavelength of each. 1 cm (frequency = 900 MHz) 2 cm (frequency = 2560 MHz) (b) Which frequency would produce smaller hot spots in foods due to interference effects? 3 MHz
*May 29, 2012*

**physics A**

im sorry, i just wanted to group my questions together so they would be easyier to find later
*May 16, 2012*

**physics**

the second answer is supposed to be in the hundreds
*May 14, 2012*

**physics**

The operating potential difference of a light bulb is 120 V. The power rating of the bulb is 105 W. Find the current in the bulb and the bulb's resistance. Current 1 A Resistance 2 I got 0.916 for A and 115 for B but they are wrong
*May 14, 2012*

**physics**

Calculate the cost of operating a 65 W light bulb continuously for a 30-day month when electrical energy costs $0.23/kW·h. $ 1
*May 14, 2012*

**physics**

the third answer is supposed to be in $
*May 14, 2012*

**physics**

I got A and B i cant figure out C
*May 14, 2012*

**physics**

A steam iron draws 6.5 A when connected to a potential difference of 120 V. (a) What is the power rating of this iron? 1 W (b) How many joules of energy are produced in 20.0 min? 2 J (c) How much does it cost to run the iron for 20.0 min at $0.014/kW·h? $ 3
*May 14, 2012*

**physics**

A color television has a power rating of 325 W. How much current does this set draw from a potential difference of 120 V? 1 . A i got 2.92 but its wrong?
*May 14, 2012*

**physics**

A color television has a power rating of 325 W. How much current does this set draw from a potential difference of 120 V? 1 . A i got 2.92 but its wrong?
*May 14, 2012*

**physics**

is 2.8 right?
*May 14, 2012*

**physics**

How much charge passes through a cross-sectional area of a copper wire in 0.8 s if I = 3.5 A? 1 C
*May 14, 2012*

**physics**

Thank you so much for helping me!!!!
*May 14, 2012*

**physics**

A hair dryer draws a current of 9.7 A. (a) How much charge passes through the hair dryer in 3.5 min? 1 C (b) How many electrons does this represent? 2 electrons
*May 14, 2012*

**physics**

both of these are wrong?
*May 14, 2012*

**physics**

A net charge of 47 mC passes through the cross-sectional area of a wire in 19.0 s. (a) What is the current in the wire? 1 A (b) How many electrons pass the cross-sectional area in 1.0 min? 2 electrons
*May 14, 2012*

**Ap physics**

Four resistors are connected to a battery with a terminal voltage of 12.0 V, (R1 = 40.0 , R2 = 80.0 , R3 = 140.0 and R4 = 15.0 ) (a) Determine the equivalent resistance for the circuit. 1 (b) Determine the current in the battery. 2 V (c) Determine the current in the 40.0 ...
*May 11, 2012*

**Ap physics**

A steam iron draws 6.5 A when connected to a potential difference of 120 V. (a) What is the power rating of this iron? 1 W (b) How many joules of energy are produced in 20.0 min? 2 J (c) How much does it cost to run the iron for 20.0 min at $0.014/kW·h? $ 3
*May 11, 2012*

**physics**

can you show me how to plug each of them in?
*May 10, 2012*

**physics**

A 17-kg rock is on the edge of a 103-m cliff. (a) What potential energy does the rock possess relative to the base of the cliff? 1 . J (b) The rock falls from the cliff. What is its kinetic energy just before it strikes the ground? 2 . J (c) What speed does the rock have as it...
*May 10, 2012*

**physics**

Mary weighs 450 N and she walks down a flight of stairs to a level 4.50 m below her starting point. What is the change in Mary's potential energy? 1 J whats the PE formula? and setup?
*May 10, 2012*

**physics**

A 18.0-kg cart is moving with a velocity of 7.30 m/s down a level hallway. A constant force of -13.0 N acts on the cart and its velocity becomes 3.30 m/s. (a) What is the change in kinetic energy of the cart? 1 . J (b) How much work was done on the cart? 2 J (c) How far did ...
*May 10, 2012*

**physics**

A steel ball has a mass of 3.8 kg and rolls along a smooth, level surface at 56 m/s. (a) Find its kinetic energy. 1 I got 404.32J bu it doset work (b) At first, the ball was at rest on the surface. A constant force acted on it through a distance of 22 m to give it the speed of...
*May 10, 2012*

**physics**

In the 1950s, an experimental train that had a mass of 3.30 104 kg was powered across level track by a jet engine that produced a thrust of 4.90 105 N for a distance of 600 m. (a) Find the work done on the train. 1 J (b) Find the change in kinetic energy. 2 J (c) Find the ...
*May 10, 2012*

**physics**

During a workout, the football players at State U. ran up the stadium stairs in 61 s. The stairs are 145 m long and inclined at an angle of 30°. If a typical player has a mass of 105 kg, estimate the average power output on the way up. Ignore friction and air resistance.
*April 10, 2012*

**physics**

How long will it take a 1630 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
*April 10, 2012*

**physics**

Using energy considerations, calculate the average force a 60.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 6.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him.
*April 10, 2012*

**physics**

Boxing gloves are padded to lessen the force of a blow. (a) Calculate the force exerted by a boxing glove on an opponent's face, if the glove and face compress 7.00 cm during a blow in which the 8.00 kg arm and glove are brought to rest from an initial speed of 10.0 m/s. 1...
*April 10, 2012*

**physics**

Using energy considerations, calculate the average force a 60.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 6.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him.
*April 10, 2012*

**College Algebra**

A projectile is thrown upward with an initial velocity of 272 feet per second. After t seconds, its height h(t)above the ground is given by the function : h(t)=-16t^2+272t. a. Determine the projectile's maximum height. b. Determine how long it takes the projectile to reach...
*February 18, 2012*

**physics**

When serving a tennis ball, the player hits it when its velocity is zero (at the highest point of a vertical toss). The racket exerts a force of 560 N on the ball for 5.00 ms, giving it a final velocity of 45.0 m/s. Using these data, find the mass of the ball.
*December 19, 2011*

**physics**

When serving a tennis ball, the player hits it when its velocity is zero (at the highest point of a vertical toss). The racket exerts a force of 560 N on the ball for 5.00 ms, giving it a final velocity of 45.0 m/s. Using these data, find the mass of the ball.
*December 19, 2011*

**physics**

You are the design engineer in charge of the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 50 km/h (30 mph). A new model of mass 1500 kg takes 0.11 s from the time of impact until it is brought to rest. (Take the ...
*December 19, 2011*

**physics**

A 0.145 kg baseball pitched at 35.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s. If the contact time between bat and ball is 1.00*10 to the -3, calculate the average force between the ball and bat during contact.
*December 19, 2011*

**physics**

A constant friction force of 15 N acts on a 70 kg skier for 20 s. What is the skier's change in velocity?
*December 19, 2011*

**AP physics**

Four forces act on a hot-air balloon with F1 = 1660 N and F2 = 5080 N , shown from the side in Figure 4-29. Find the magnitude and direction of the resultant force on the balloon. a)N b)° (counterclockwise from the horizontal)
*December 12, 2011*

**physics**

A shopper in a supermarket pushes a loaded 36 kg cart with a horizontal force of 12 N. (a) How far will the cart move in 3.5 s, starting from rest? (Disregard friction.) (b) How far will the cart move in 3.5 s if the shopper places an 95 N child in the cart before pushing?
*December 12, 2011*

**physics**

A boat moves through the water with two forces acting on it. One is a 5.3 103 N forward push by the motor, and the other is a 0.9 103 N resistive force due to the water. a)) If it starts from rest, how far will it move in 6 s? b) What will its velocity be at the end of this ...
*December 12, 2011*

**debating**

Our debating topic is 'That good news is not news.' I am on the negative team so I am saying that good news is, in fact news. I personally believe the good news really isn't news and so I'm struggling to debate for the negative team. I am the first speaker. So ...
*July 22, 2011*

**Math**

Meg has 20 pet stickers to go on this page 1/4 of them are dog stickers 1/2 of them are cat stickers The rest are rabbt stickers. How many Rabbit stickers does Meg have?
*March 10, 2011*

**chem**

i have this question for an online assignment and it keeps telling me that 5.47 is wrong. so my guess is that you do need the density...just saying
*February 13, 2011*

**math**

2/5Q is less than or equal to -18 i am really stuck and i am not surehow to figure it out!
*January 4, 2011*

**college**

I need help with writing a thesis statement for a paper on discrimination in a diverse culture
*December 3, 2010*

**algebra**

a commerical jet and a private plane leave the same airport at the same time traveling in opposite directions at average speeds of 880km/h and 450km/h respectively. in how many minutes will they be 1463 km apart.
*November 21, 2010*

**math**

What is the domain of f (x) = sqr root of x^2 - 5x - 14?
*August 31, 2010*

**biology**

explain why scientists look at the health and population of organisms to measure to effects of pollution in an ecosystem instead of directly measuring the concentration of chemical in the environment.
*August 19, 2010*

**socila studies**

i need more sites on verrazzano
*April 14, 2010*

**5th grade**

what istes can i find info for my teacher on verrazzano
*April 14, 2010*

**5th grade**

where can i find info on Verrazzano
*April 13, 2010*

**Social Studies**

How does geography affect where people live and work in Canada?
*March 21, 2010*

**6TH GR. ALGEBRA **

Can you think of any two numbers that, when subtracted, multiplied, or divided, yield a number that is not rational? For example, take the rational numbers 2 and 3. 2 - 3 = -1 2 * 3 = 6 2 / 3 = 2/3 Are any of the results irrational? And are there any other rational numbers ...
*December 16, 2009*

**6TH GR. ALGEBRA **

EXTENDING THE LESSON If you add any two rational numbers, the sum is always a rational number. So, the set of rational numbers is closed under addition. Is the set of rational numbers closed under subtraction. multiplication,and division also? Explain.
*December 16, 2009*

**Math**

sorry it was a copy and paste job should checked it thanks for the help
*December 15, 2009*

**Math**

I'm not sure how to do this question 7. The growth of bacteria in culture can be described by the equation N1 = N0e' where N is the number of bactena at any time t, No is the initial number of bacteria, and k is a constant. The time taken for growth to double the ...
*December 15, 2009*

**math**

equivalent fractions have the same value after calculation but look different you work them out by dividing the denominator and the numerator by the same number (the numbers on the top and bottom of the fraction)or multiplying but this isn't usually used 60/80 = 0.75 if ...
*December 15, 2009*

**Business Math**

A furniture store sells recliners at a 70% mark-up (based on price). If the recliner costs the store $240, what price will they charge? Formula: %Markup on cost=%markup on selling price/100% - % markup on selling price x = 70%/100%-70% x = 70%/30% x = 233.333% cost $240 x (233...
*December 8, 2009*

**Business Math**

That would be the answer for the markup on cost, but the 70% is a markup on selling price not cost. Formula: %Markup on cost=%markup on selling price/100% - % markup on selling price x = 70%/100%-70% x = 70%/30% x = 233.333% cost $240 x (233.33%) = $800 ??????????????? Does ...
*December 8, 2009*

**Business Math**

A furniture store sells recliners at a 70% mark-up (based on price). If the recliner costs the store $240, what price will they charge?
*December 8, 2009*

**maths PLEASE HELP**

Can you give me some help with this question im not sure how to even start in a reaction A to P the mass of A at any given time T is Mt and the rate of transformation of A at time T is prportional to Mt given that the original mass of A is 130g and that 50g has been ...
*November 29, 2009*