# Posts by WEB

Total # Posts: 6

**physics**

To create artificial gravity, the space station is rotating at a rate of 0.80 rpm. The radii of the cylindrically shaped chambers have the ratio rA/rB = 3.80. Each chamber A simulates an acceleration due to gravity of 10.0 m/s2.

**Chemistry**

How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 123.5 mL of 0.48 M H2SO4?

**Stastics**

A doctor at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires to be 98% confident that the true mean is within 2 ounces of the sample mean? The standard deviation of the birth weights is known to be 5 ...

**Physics**

Push against the rock= (mg)\(u1+u2)

**Physics**

A 56 kg rock climber is climbing a "chimney" between two rock slabs as shown in the figure. The static coefficient of friction between her shoes and the rock is 1.02; between her back and the rock it is 0.70. She has reduced her push against the rock until her back ...

**physics**

force of push = (mg)/(u1+u2), so (49*9.8)/(1.2+.8)=240.1N fraction of weight= (u1)/(u1+u2),so (1.2)/(1.2+.8)=.6