Saturday

February 28, 2015

February 28, 2015

Total # Posts: 33

**physics**

A(n) 0.42 kg softball is pitched at a speed of 12 m/s. The batter hits it back directly at the pitcher at a speed of 27 m/s. The bat acts on the ball for 0.016 s. What is the magnitude of the impulse imparted by the bat to the ball? Answer in units of N · s. 011 (part 2...
*February 1, 2015*

**Physics**

An object in space is initially stationary relative to the Earth. Then, a force begins acting on the object, starting with a force of 0 N, and increasing at a uniform rate until the magnitude of the force is 56 N after the force has acted for 10 s. The body has a mass of 15 kg...
*January 30, 2015*

**Physics**

A 64.3 kg astronaut is on a space walk when the tether line to the shuttle breaks. The astronaut is able to throw a 10.0 kg oxygen tank in a direction away from the shuttle with a speed of 11.9 m/s, propelling the astronaut back to the shuttle. Assuming that the astronaut ...
*January 26, 2015*

**science**

gravitational force decreases with distance. what does this mean for a space traveler who leaves earth in a spaceship?
*May 7, 2014*

**chemistry**

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 ...
*April 13, 2014*

**Physics**

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
*October 1, 2013*

**CHEMISTRY**

How do we determine whether a substance is pure in a chemical formula ?
*February 6, 2013*

**College Algebra**

3xy^4sqt.xy
*February 6, 2013*

**physics**

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, ...
*December 9, 2012*

**physics**

When a 2.9 kg object is suspended in water, it "masses" 1.5 kg. What is the density of the object?
*December 1, 2012*

**physics**

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 ...
*December 1, 2012*

**physics**

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?
*November 25, 2012*

**physics**

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
*November 4, 2012*

**physics**

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 ...
*October 21, 2012*

**physics**

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? ...
*September 28, 2012*

**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
*September 15, 2012*

**MATH**

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
*May 18, 2012*

**Chemistry**

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
*April 30, 2012*

**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
*March 29, 2012*

**Math**

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
*November 2, 2011*

**Chemistry**

the pH of 10.00 mL of 0.100 M HCl after adding 10.00 mL of indicator solution
*June 12, 2011*

**Chemistry**

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?
*June 11, 2011*

**chemistry**

use PV=PV Answer 2.73
*March 3, 2011*

**Math**

A shirt is on sale for 25% (1/4) off. Its original price was $12. How much is the shirt now?
*November 17, 2010*

**physic**

37500 N 166666.6667 LBS
*October 14, 2010*

**Europe**

is the european union federation, a confederation or something else?
*April 8, 2010*

**Calculus**

Hi, Kavya! :D LOL
*March 17, 2010*

**math**

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.
*March 10, 2010*

**4th grade**

65
*February 11, 2010*

**college**

for com/220
*April 21, 2009*

**math**

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?
*July 28, 2008*

**English**

whats figurative language? Check this site for a great explanation and examples. http://volweb.utk.edu/school/bedford/harrisms/1poe.htm Thank you for using the Jiskha Homework Help Forum. If you are seeking a definition for "figurative language" it is used to create ...
*April 13, 2007*

**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 ...
*March 2, 2007*

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