If someone coulod explain questions 7 and 10 to me I would appreciate it. The an

Question

If someone coulod explain questions 7 and 10 to me I would appreciate it. The answer to number 7 is B and number 10 is D. thanks

The cross sectional areas of the left and right columns of the U-tube shown at right are 0.003 m2 and 0.01 m2, respectively. A snug frictionless piston of mass M =4 kg sits on the fluid surface in the right column as shown. If the density of the fluid is 900 kg/m3, the vertical separation h between the fluid surfaces in the two columns is: 1.2m 0.44m 0.3m 0.9m The small piston of a hydraulic lift (see figure at right) has a cross-sectional area of 3 cm2, and its large piston has a cross-sectional area of 200 cm2. What downward force of magnitude F1 must be applied to the small piston for the lift to raise a load whose weight is Fg = 15 kN? Neglect the effects due to the difference in vertical positions of the two pistons. Assume that piston's are weightless. 5 kN 246 N 225 N 67 N A 9.0 kg block of metal measuring 18.0 cm by 8.0 cm by 8.0 cm is suspended from a scale and immersed in water as shown in the figure at right. The 18.0 cm dimension is vertical, and the top of the block is 5 cm below the surface of the water. Approximate reading on the scale is: 76 N 88 N 45 N 90 N A jet airplane in level flight has a mass of 4 Times 105 kg. Its estimated total wing area is 560 m2 and the density of air is 1.3 kg/m3. The pressure difference between the lower and upper surfaces of the wings? 6.7 Times 103 Pa 7.6 Times 103 Pa 6.2 Times 103 Pa 7.0 Times 103 Pa

Explanation / Answer

07) A1=.003 M2

A2=.01 M2

M= 4 Kg

PRESSURE= F/A= 4*g/ .01= 3920N/m2

P= DENSITY*HEIGHT* g

Height= p/density*g

3920/900*9.8=.44m

H=.44m

8) downward force=Fg*small area/large area

= 15*3/200=.225=225N

9) mass=9 kg

Force= 9*9.8= 88.2N

Reading=88N

10) PRESSURE=m*g/area

= 400000*9.8/560=7000N/m2

=7*103Pa

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