July 28, 2014

Posts by kev

Total # Posts: 30

gravitational force decreases with distance. what does this mean for a space traveler who leaves earth in a spaceship?

Biosynthesis of proteins from amino acids is an energy driven condensation process (ÄH = + 10 kJ/mol) requiring energy input in the form of ATP. In an experiment, 0.4 mol of amino acids reacted to give a polypeptide and some ATP was consumed. a) explain how biosynthesis o...

An elevator is moving upward 1.17 m/s when it experiences an acceleration of 0.33 m/s2 downward, over a distance of 0.75 m. What will its final speed be? Answer in units of m/s

How do we determine whether a substance is pure in a chemical formula ?

College Algebra

The figure below shows the circular wave fronts emitted by two sources. Make a table with rows labeled P, Q, and R and columns labeled r1, r2, Δr, and C/D. Fill in the table for points P, Q and R, giving distances as multiples of λ and indicating, with a C or a D, wh...

When a 2.9 kg object is suspended in water, it "masses" 1.5 kg. What is the density of the object?

A 4.55 kg object is released from rest while fully submerged in a liquid. The liquid displaced by the submerged object has a mass of 3.20 kg. How far and in what direction does the object move in 0.200 s, assuming that it moves freely and that the drag force on it from the liq...

Which consumes more energy, a 1.5 kW hair dryer used for 10 min or a 10 W night light left on for 19 hr?

A 2000 kg car is rolling at 2.0 m/s. You would like to stop the car by firing a 12 kg blob of sticky clay at it. How fast should you fire the clay? i keep getting 25.8 but apparently that isn't right so i'm at a loss

An 76 kg construction worker sits down 2.0 m from the end of a 1440 kg steel beam to eat his lunch. The cable supporting the beam is rated at 15,000 N. Should the worker be worried? Determine the tension in the cable. i.imgur. com/Qfhkd. gif I can't figure it out.. I know ...

The forces in the figure below are acting on a 2.1 kg object. Find the values of ax and ay, the x and y components of the acceleration. i.imgur. com/nNz9m. png this is one of the last problems on my homework that i just do not understand.. can someone please explain it to me? ...

organic chem
looking at this h nmr spectra of 4 isomeric alcohols with the formula c5h12o, make a suitable structure for each spectrum and assign h nmr signals for each H in the molecule i.imgur. com/MTHt3. png

a parabola passes via the points (1.5,1) and (3,-5). given that the vertex lies on the line 7x+3y-4=0,find the focus and the equation of the parabola

How many grams of formic acid, HCOOH, must be added to 0.270L of 0.180M sodium formate, HCOONa, to yield a buffer solution with a pH of 4.20? Assume no volume change. Ka of HCOOH= 5.010^-4

College Chemistry
A stock solution is prepared by adding 20mL of 0.2M Na3PO4 to enough water to make 80mL. What is the Na+ concentration of 20mL of the stock solution? I am thinking .012: a) .02 times .2 = .004 b).004 times 3 = .012 (for each Na in the molecule) Seems too simple

barry puts TVs on a 15-foot shelf in his electronics store. He allows 2 1/2 feet of space for each TV. He will be able to put 5.5 TVs on the shelf. Is this reasonable or not

the pH of 10.00 mL of 0.100 M HCl after adding 10.00 mL of indicator solution

What volume of water would be required to dissolve 1 g of BaF2? mass of BaF2 is 1.31 g and it dissolves in 1 L of water. The answer is 0.763. Can someone please explain how they got this?

use PV=PV Answer 2.73

A shirt is on sale for 25% (1/4) off. Its original price was $12. How much is the shirt now?

37500 N 166666.6667 LBS

is the european union federation, a confederation or something else?

Hi, Kavya! :D LOL

The volume of a rectangular prism is 2x^3+5x^2+x-2. The height of the prism is 2x-1, and the length of the prism is x+2. Find the width of the prism.

4th grade

for com/220

how would I find each sum or difference of (5a-2b) + (-4a+5b) what do I do with -2b when you line up the +5b?

whats figurative language? Check this site for a great explanation and examples. Thank you for using the Jiskha Homework Help Forum. If you are seeking a definition for "figurative language" it is used to create ...

limit calc question
2 questions!!! 1. Limit X approaching A (X^1/3-a^1/3)/ x-a 2. LiMIT x approaching 0 (1/3+x – 1/3) /x On the first, would it help to write the denominator (x-a) as the difference of two cubes ((x^1/3 cubed - a^1/3 cubed) second. use LHopitals rule. Take the derivative of t...

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