A future use of space stations may be to provide hospitals for severely burned persons. It is very painful for a badly burned person on Earth to lie in a bed. In a space station, the effort of gravity can be reduced or eliminated. With what period of rotation would a doughnut-shaped hospital of 200 m. radius have to rotate, if persons on the outer perimeter are to experience 1/10 the gravity effect of Earth?

What are similarities and differences between refraction, reflection, diffraction and absorption?

The vapour pressure of benzene is 53.3 kpa at 60.6 °c, but it fell to 51.5 kpa when 19.0 g of a non-volatile organic compound was dissolved in 500 g of benzene. calculate the molar mass of the compound.

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.