an equation desctibing the approx pressure in Pa

equation describibg the approx pressure in Pa at centre of a planet that has radius R and as mean densiry P is given by P = 2nG --- p2 R2 3 where G is the universal gravitation constant Radius of earth 6.37 x 10 3Km Mean density 5.51 x 10 3kg m -3 Calculate the expected pressure at the centre of the earth, expressing answer in scientific notation to app. significant fiqures G = 6.67 x 10 -11 Nm2kg -2 With the answer rearrange the equation given the equation in the form R= Sorry couldnt get the correct symbols when laying out equation hope what I have done is ok. I have worked this out but I think I have done something wrong I would appreciate your help. I would ... click for more

7091-phy

please answer me for the attached. ---------- Automobile engine slows down from 4500rpm to 1200rpm in 2.5 s. Calculate (a) its angular acceleration, assumed constant, and (b) the total number of revolutions the engine makes in this time. Pilots can be tested for the stresses of flying high speed jets in a whirling "human centrifuge," Which takes 1.0 min to turn through 20 complete revolutions before reaching its final speed. (a) What was its angular acceleration (assumed constant) and (b) what was its final angular speed in rpm. A small 650 gram ball on the end of a thin, light rod is rotated in a horizontal circle of radius 1.2m. Calculate (a) moment of inertia of the ball about th... click for more

Saturation Vapour Pressure

A 1 m^3 closed container contains air with vapor pressure 10hPa. a dish containing 8 g of liquid water is placed in the container. a thermostat maintains the temperature of the air within the container at 25 degree Celsius at all times. In the following, assume a latent heat of vaporization of 2.4*10^6 J/kg. Will all the water in the dish eventually evaporate? If the container holds 1.3 kg of dry air, what are the final specific and relative humidities of the air in the container? what is the dew point?

air pressure

(a) assuming an average sea-level pressure of 1000hPa, what is the mass of the atmosphere? assume that the earth is as sphere with radius 6400km. (b) what is the mass of the atmosphere above 500hPa? you can again assume a sphere of radius 6400km for this calculation. what fraction of the mass of the earth's atmosphere lies above 500 hPa? (c) repeat (b) for the 250hPa surface.

altimeter

does the sensitivity of an altimeter to errors in the boiling point temperature increase or decrease with altitude? make the approximation that the latent heat of vaporization and the scale height do not depend on the boiling point temperature.