Calculate the presure exerted on a swimming when he is
a) at the water surface
b) 5m below the water surface
(Take density of the water p = 1000kg cubic meter, acceleration due to gravity g = 10m s cubic, atmospheric pressure p = 1.01×10^5 Pa)

When an object is heated it contracts. a. true b. false

Which statements describe the movement of ocean currents around the globe? check all that apply. strong winds force warm water to sink to the ocean floor. the coriolis effect causes warm and cold water to mix. cool dense water sinks to the ocean floor. warm water replaces cool surface water. wind blowing parallel to the shore causes upwelling of cool water.

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?