Questions Asked on
December 28, 2006

  1. physics

    THree blocks of masses 3m, 2m and m are connected to strings A,B, and C. The blocks are pulled along a rough surface by a force of magnitude F exerted by string C. The coefficient of friction between each block and the surface is the same. Which string

    asked by me
  2. physics.

    A car travels forward with constant velocity. It goes over a small stone, which gets stuck in the groove of a tire. The initial acceleration of the stone, as it leaves the surface of the road is, a)vertically up b)horizontally forward c)horizontally

    asked by me
  3. physics

    A student holds one end of a string in a fixed position. A ball of mass .2 kg attached to the other end of the string moves in a horizontal circle of radius .5m with a constant speed of 5m/s. How much work is done on the ball by the string during each

    asked by me
  4. physics

    A student is testing the kinematic equations for uniformly accelerated motion by measuring the time it takes for light-weight plastic balls to fall to the floor from a height of 3 m in the lab. The student predicts the time to fall using g as 9.8 m/s^2 but

    asked by me
  5. Chemistry

    A basketball is inflated in a garage at 25 degrees Celsius to a gauge pressure of 8.0 psi. Gauge pressure is the pressure above atmospheric pressure, which is 14.7 psi. The ball is used on the driveway at a temperature of -7 degrees celsius and feels flat.

    asked by Alexandria
  6. Physics

    An object is dropped from rest from the top of a 400 m cliff on Earth. If air resistance is negligible, what is the distance the object travels during the first 6s of its fall? a)30m b)60m c)120m d)180m e)360m I got a) as my answer. I used x-x_i = v_i * t

    asked by me

    HI I have no idea what's Alternative energy source . Can anyone help me in giving me a defintion for it thanx An alternative energy source is an additional one that is not being used already. It depends on what source is predominant or currently being

    asked by Anonymous
  8. Could someone help me proofread?

    When most people hear the word chemistry, the first things that usually come to mind are bubbling beakers, mysterious powers, and, of course, explosions! Actually, the truth is, the science of chemistry, simply looks at how matter changes. Throughout my

    asked by Rina Johnson
  9. social studies

    What is the physical environment at sun temple, Konark ?????? Since this is not my area of expertise, I searched Google under the key words "Konark sun temple environment" to get this source: I hope this helps. Thanks

    asked by Alankrit
  10. frogs

    Two girls caught 25 frogs. Lisa caught four times as many as Jen did. How many frogs did Jen catch? Lisa => 4x Jen => x 4x + x = 25 x = 5 Lisa => 20 Jen => 5 jen caught 5 frogs

    asked by kievah
  11. math

    Determine whether this function has a mzximum or minimum value and then find that value: f(x)=2x^2 + 3x -9 The derivative, f'(x) = 4x +3, is zero when x = -3/4 . That means there is a relative extreme value (either maximum or minimum) there. The second

    asked by Beth
  12. science

    Hi .. Please school is coming and I need help im ny research What are the patterns of the Reactivity in the Periodic table and the Atomic Structure I have been in lots of websites and I can't find it Please help tahnx Metals in the lower left corner are

    asked by ِِamy
  13. Music

    Can anyone tell me how the basso continuo changed through the baroque to the classical period? Thank you for using the Jiskha Homework Help Forum. Hopefully the following site will help you:

    asked by Zoe
  14. Chemistry

    Can you convert density to moles? I am given the density of a substance [0.789 g/mL] but I need to know the number of moles for the equation. You cannot convert density to moles, unless you also know the volume and the molecular formula. (density) * Volume

    asked by Alexandria
  15. physics

    Two pucks moving on a friction less air table are about to collide. The 1.5 kg puck is moving directly east at 2 m/s. the 4 kg puck is moving directly north at 1 m/s. What is the total kinetic energy of the two-puck system before the collision? a) sqrt(13)

    asked by me
  16. math

    how can i get 78 cents by only using 7 coins? 50 + 10 + 10 + 5 + 1 + 1 + 1 There are still 50 cent pieces in circulation

    asked by vanessa
  17. Curriculum Development Question

    I have this question on a homework assignment. Which of the following menus is best for preschoolers as outlined by the Food Guide Pyramid for children. 1.Breakfast-fruit juice,a bowl of cereal,and a piece of toast Morning snack-fruit juice and crackers

    asked by Sierra
  18. health/homework

    hi i was just wondering i don't know why or if my quesiton was deleted so ill repeat it...i was wondering if you knew if their were exfoliators for my skin, this is also a homework assignment as well because i have a science experiment were im testing

    asked by tameka
  19. history

    Does anyone know any songs that have a history behind them/explain an event in history? (ie Sweet Home Alabama, American Pie) Much thanks! Check these sites for a few songs that have a history and/or explain an event.

    asked by Gloria
  20. English

    We must truly become our brothers’ and sisters’ keepers. Is this written correctly? OR should it be We must truly become our borther's and sister's keepers. OR We must truly become our brother and sisters' keepers. Because the statement applies

    asked by Valerie

    What is Calcium Chloride (CaCl2) used for transformation on bacteria and antibiotics? it is a study of a branch of biology where we come to know about the world of microrganisms.

    asked by MICROBIO HELP
  22. history

    Nobody won World War I because the Central Power surrendered except Germany, but Germany was later forced to sign the armistice. Is this a question, or what you believe to be true? If so, think again.

    asked by Sarah
  23. food science

    When given a samples of sugars, how do you identify whether the sugar is reducing or non-reducing, and/or monosaccharides, or polysaccharides? Helpful websites are greatly appreciated.

    asked by Jan
  24. Stats

    What happens to the power of the z test, when the standard deviation increases? The deviation from the mean must be larger to obtain the same significance level. I'm not familiar with the term "power" (we don't use that term in physics), but I would guess

    asked by Cheri
  25. Curriculum Development Question--PLZ HELP!!

    Would the following example be a behavioral objective,curriculum guide, anecdotal observation,or lesson plan? Miss Kine realized that Cameron never chose to play in the housekeeping area. She thought about ways that would encourage Cameron to choose this

    asked by Yolanda
  26. Ecology

    Hi, to calculate the GPP of an area, would I need to add the NPP and amount of respiration together? Hope this makes sense!

    asked by Mac
  27. history

    The Overman Act was signed by President Wilson to gain more control over the war. If this is a true or false question, the answer is True.

    asked by Sarah
  28. Biochem

    Can someone please help me find, or know of any molecules that are at least 20 bases (carbons, nitrogens..) long and have 3 hybrids (sp, sp2, dsp)

    asked by Kara