1) Since there is more CENTRIFUGAL force at the equator to cancel gravity, your overall weight at the equator versus at the poles is even less. The centrifugal force on your body at the equator is 0.034 m/s2 times the mass of your body. The centrifugal force at the poles is zero. 2) With increase in height from the surface, density of air decreases. At a height of about 6 km, density decreases to nearly half of its VALUE at the SEA level. Atmospheric pressure is proportional to density. HENCE, at a height of 6 km from the surface, it decreases to nearly half of its value at the sea level.3) Mass of the girl, m=50kgDiameter of the heel, d=1cm=0.01mRadius of the heel, r= 2d =0.005mArea of the heel =πr 2 =π×(0.005) 2 =7.85×10 −5 m 2 Force exerted by the heel on the floor:F=mg =50×9.8 =490NPressure exerted by the heel on the floor:P= AreaForce =490/(7.85×10 −5 )=6.24×10 6 N/m 2 Therefore, the pressure exerted by the heel on the HORIZONTAL floor is 6.24×10 6 N/m 2 .4) i dont know5) Straws work because of something you can't see, but is everywhere. ... The liquid rises in the straw, to exactly the same height as the liquid in the glass. That's because the atmosphere is pushing down on the liquid in the glass. The atmosphere pushes the liquid in the glass up into the straw.hope this helps plz Mark me as brainliest answerplz follow me