Posts by Hayli

Total # Posts: 22

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?

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?

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?

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 ea...

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

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

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

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 ...

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