Thursday
May 23, 2013

Posts by Al


Total # Posts: 251

Math
If you have 1/2cup of water and you take out 3/8 of water how much do you have left

math
yes. there are a total of 10. thanks for the help

math
some years in the 20th century have 4 different odd digits. How many of those years have the sum of the digits greater than 20?

Physics
It seems wrong, please help!

Physics
Please help anyone!

AP Chem
MnS(s) + 2 H+ --> Mn2+ + H2S(g) At 25 C the solubility product constant, Ksp, for MnS is 5 x 10-15 and the acid dissociation constants K1 and K2 for H2S are 1 x 10-7 and 1 x 10-13, respectively. What is the equilibrium constant for the reaction represented by the equation ...

physics
A coin is placed on an old record turntable which rotates at 78 rpm. The coefficient of friction between the record and the coin is 0.17. b) At what distance (m) from the center will the coin begin to slide off the record? c) What is the period of the rotation (s) of the penny?

physics
A toy plane of mass 0.624 kg is flown in a circle when attached to a string. The plane moves around the circle with a rotational speed of 8.09 rpm. The length of the string is 2.60 m. What is the tension in the string?

physics
A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm. a) What is the period of rotation in seconds? b) What is the frequency of the rotating disc? d) What is the l...

physics
c) A penny sits 12 cm from the center of a record turning at 33 1/3 rpm. What is the tangential speed in m/s?

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