# Posts by Hayli

Total # Posts: 23

**science help plzzz**

I got a 60 too

*January 17, 2014*

**Physics**

Isaac pushes rock, of a mass of 20kg, if from a cliff and it falls into the lake below. The cliff was 3m above the water. (Assume no air resistance) a. How much time did it take the rock to hit the water? b. What was its velocity when it was half of the distance to the water?

*February 20, 2012*

**physics**

Suppose a 65-kg person can run 1000m in 5min. Assume that each stride is 1.5m long, and with each stride the runner must supply an amount of energy equal to her kinetic energy. How much energy (in food calories) is required to run 1km? Is your answer realistic?

*January 29, 2012*

**Physics**

A steel guitar string is 73 cm long and 0.15 mm in diameter. If it's under tension of 1.5kN, how much is it stretched?

*December 11, 2011*

**Physics**

Engineers are trying to create artificial "gravity" in a ring-shaped space station by spinning it like a centrifuge. The ring is 100m in radius. How quickly must the space station turn in order to give the astronauts inside it weights equal to their weights at the ...

*November 27, 2011*

**Physics**

Engineers are trying to create artificial "gravity" in a ring-shaped space station by spinning it like a centrifuge. The ring is 100m in radius. How quickly must the space station turn in order to give the astronauts inside it weights equal to their weights at the ...

*November 27, 2011*

**PRE CALC PLEASE HELP!!!!!!!!**

find the solutions of the equation that are in the interval [0,2pi) 2-cos^2x=4sin^2(1/2x)

*November 4, 2010*

**Pre CAL!! Please HELP**

find the solutions of the equation that are in the interval [0,2pi) (a) sin2t+sint=0 (b)cost-sin2t=0

*November 4, 2010*

**Pre CAL!! Please HELP**

find the solutions of the equation that are in the interval [0,2pi) (a) sin2t+sint=0 (b)cost-sin2t=0

*November 4, 2010*

**Economics**

who knows how to measure the true cost of a pint of B-Positive blood? A.None of these B.Any competent medical authority C.Only the Surgeon General of the United States D.An economist E.A clerk at the blood bank

*October 11, 2010*

**STATISTICS**

Who is the king of the late night TV? An internet survey estimates that, when given a choice between David Letterman and Jay Leno, 52% of the population prefers to watch Jay Leno. Suppose that you randomly select three late night TV watchers and ask them which of the two talk ...

*September 29, 2010*

**statistics**

thank you

*September 29, 2010*

**statistics**

The game of roulette uses a wheel containing 38 pockets. Thirty-six pockets are numbered 1,2.....,36, and the remaining two are marked 0 and 00. The wheel is spun, and a pocket is identified as the "winner." Assume that the observance of any one pocket is just as ...

*September 29, 2010*

**STATS**

the following case occured in Gainsville, Florida. the eight-member Human Relations Advisory Board considered the complaint of a woman who claimed discrimination, based on her gender, on the part of a local surveying company. The board, composed of five women and three men, ...

*September 27, 2010*

**PreCal**

i have to figure out what x is

*September 14, 2010*

**PreCal**

log(5x+1)=2+log(2x-3) log(5x+1)-log(2x-3)=2 (5x+1)/(2x-3)=10^2 what do i do after that?

*September 14, 2010*

**Pre Calc!**

Thank you!

*September 14, 2010*

**Pre Calc!**

A drug is eliminated from the body through urine. Suppose that for a dose of 10 milligrams, the amount A(t) remaining in the body t hours later is given by A(t)=10(0.8)^t and that in order for the drug to be effective, at least 2 milligrams must be in the body. (a) Determine ...

*September 14, 2010*

**Pre Calc!**

A drug is eliminated from the body through urine. Suppose that for a dose of 10 milligrams, the amount A(t) remaining in the body t hours later is given by A(t)=10(0.8)^t and that in order for the drug to be effective, at least 2 milligrams must be in the body. (a) Determine ...

*September 14, 2010*

**math**

but what is k?

*September 12, 2010*

**math**

but whats k

*September 12, 2010*

**math**

so how would i find the values of the two?

*September 12, 2010*

**math**

Find the maximum integer k on your calculator such that log(k)can be evaluated. How could you evaluate the following: log(k+k);log(k^5) on the same calculator? Now find these values.

*September 12, 2010*

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