Sunday

March 29, 2015

March 29, 2015

Total # Posts: 234

**Chemisty**

ok i got 0.882, is that correct? How do I calculate the mass of water in the container?
*February 6, 2010*

**Chemisty**

A student heats 10.8 g of lead to a temperature of 90.5 C. He places the hot lead into a container of water, initially at a temperature of 24.6 C; the final temperature of the water and lead is 25.2 C. What quantity of heat was lost by the lead?
*February 6, 2010*

**Chemistry**

A student places 100 mL of tap water in a beaker and uses both a thermometer and a temperature probe to measure temperature. The temperature of the water as measured by the thermometer is 27.7 C. The temperature of the water as measured by the temperature probe is 24.9 C. The ...
*February 1, 2010*

**physics**

Find the direction of the vector represented by the following pair of components: Ax= -3.15 m, Ay= 6.85 m. Find theta measured from the +x direction I don't know where to begin on this, could anyone guide me or give me steps?
*January 28, 2010*

**Trig**

Let O represent the origin and P be the point (9, -4). Find the positive angle (counterclock wise direction)that the line segment OP makes with the positive x-axis. the answer is 5.86 radians but i keep getting 0.418 radian. please help and show work
*January 24, 2010*

**Trig**

Let O represent the origin and P be the point (9, -4). Find the positive angle (counterclock wise direction)that the line segment OP makes with the positive x-axis. the answer is 5.86 radians but i keep getting 0.418 radian. please help and show work
*January 24, 2010*

**calculus (related rates)**

A particle moves in the plane along the curve y=xln(x). At what rate is the distance from the origin increasing at the moment its x-coordinate is 2 cm and its x-coordinate is increasing at a rate of 17 cm/sec?
*October 27, 2009*

**calculus**

T^(1/3)=e^(r/10)m^(3/2) If the mass and radius are given as m= 2 mg and r= 5mm, and the rates of change of the temperature and radius are given as 3 deg/sec and 1 mm/sec, what is the rate of change of mass (m)?
*October 27, 2009*

**chemistry**

why can I not use the formula m1v1=m2v2 for the following question: What volume of 1.20 M NaOH will be needed to neutralize 225 mL of 3.0 M sulfuric acid? I get 0.56 L but the answer should be 1.1 L. When am I able to use that formula and when can I not?
*October 18, 2009*

**calculus**

f(x)= -7(cos(s^3))(tan(s^2)), find f'(x). I got 21s^2cos(s^3) x 2s(sec^2(s^2)) but it is wrong...
*October 15, 2009*

**music**

the banana boat song is part of which section in music
*September 9, 2009*

**college physics**

A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 7.00s later. What is acceleration of rocket. I believe if you use x(final)= x(initial +v(initial)deltaT+ 1/2adeltatsquared...
*September 6, 2009*

**physics**

A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 7.00 later.
*September 6, 2009*

**physics**

What are four situations where photovoltaic cells would have an advantage over other sources of electric energ?
*February 9, 2009*

**Physics Lab**

I have to make a graph showing to the tenth of a second showing velocity, displacement, and acceleration for throwing a tennis ball up three times and letting it hit the ground. My times are 2.85 seconds, 2.56 seconds, and 2.60 seconds. Any help would be greatly appreciated.
*October 21, 2008*

**math**

brittany, you gave another problem on my question that is not related to my question
*September 25, 2008*

**math**

on a certain farm, on average, 64 hens lay 768 eggs in 64 days. also on average, 46 hens on same farm eat 46 kilograms of wheat in 46 days. On this farm, on average, the consumption of how much wheat (in kg) corresponds to 2 dozen eggs?
*September 25, 2008*

**Physics**

what is the word used for distance traveled per time unit? What is speed in a given direction? And what is the word used for A moving object traveling the same distance in equal units of time?
*September 15, 2008*

**Statistics**

Given a single deck of cards, what is the probability of drawing either a king or a diamond? Hint – There are four kings in a deck and 13 diamonds. There are a total of 52 cards in a single deck.
*May 10, 2008*

**business**

For a given nominal interest rate, an unexpectedly low inflation rate ______ the real interest rate. a. increases b. decreases c. has no impact on d. may either increase or decrease e. is subtracted from
*March 17, 2008*

**Chemistry**

BrO-3 + 5Br- + 6H+ ---> 3Br2 + 3H2O the value of - delta[BrO3]/delta T= 1.5x10^-2M/s at a particular time what is the value of -delta [Br-]/Delta t at the same instant? 13 M/s 7.5x10^-2 1.5x10^-2 3.0x10^-2 330 M/s
*February 25, 2008*

**Chemistry**

+1,+4,-2 is the oxidation numbers for Rb2SO4 in order that the elements are shown in the formula.
*November 22, 2007*

**science-reasoning**

in 5 seconds, a car moving in a straight line increases it's speed from 50km/h to 65km/h, while a truck goes from rest to 15km/h in a straight line. which undergoes greater acceleration? what is the acceleration of each vehicle?
*October 20, 2007*

**science-reasoning**

tnx :)
*October 20, 2007*

**science-reasoning**

light travells in a straight line at a constant speed of 300,000 km/sec. what is the light's acceleration?
*October 20, 2007*

**science- reasoning**

why is it that an object can accelerate while travelling at constant speed but not at constant velocity?
*October 20, 2007*

**history**

Describe how the Cold War ideology that crystallized after WWII changed wartime alliances that had existed during the war?
*September 6, 2007*

**algebra2**

y= 1/3x + 3/2 what is your question?
*August 15, 2007*

**Economics**

the 2 main parts to a federal budget??? anyone? how bout revenues and outlays??
*May 14, 2007*

**Economics**

What are the 4 roles a government takes in regulating market activities and What is a popular measure of the price level Do some research, then take a shot. How does govt regulate markets? 2) CPI
*May 14, 2007*

**Civics**

What are the 4 roles a government takes in regulating market activities???
*May 14, 2007*

**math**

How do you simplify this? 1/{(x/y)+1} multipy numerator and denominator by y. y (1)/y(x/y +1) then simplify y/1+x?
*May 8, 2007*

**The Art of Cinematography**

zoom lens
*December 10, 2006*

**sociology**

I think that the IAT IS accurate. I just think that to many of us are willing to be honest with ourself. Anyway, I need some help finding the other ways of measuring prejudice also. Go U of P
*July 20, 2006*