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Bộ tài liệu bài tập tham khảo môn vật lý bậc đại học bằng tiếng anh Chapter 14 | 14.1 w mg pVg 7.8 x 103 kg m3 0.858m n 1.43 x 10-2 m 2 9.80m s2 41.8 N or 42 N to two places. A cart is not necessary. 14.2 m m p v a 7.35 x 1022 kg _ g3 3.33 x 103 n 1.74 x 106 mJ kg m3. 14.3 p m - 0 0158kg r 7.02x 103 kg m3. You were cheated. K V 5.0x15.0x30.0 mm3 01 14.4 The length L of a side of the cube is L V1 f m3 f-4 3 p 21.4 x 103 kg m3 12.3 cm. 14.5 m pV nr3 p Same mass means ra3 pa rf p1 a aluminum l lead i 1 3 X t 1 3 r f a f n-3 x 10 1.6 r I Pa I 2.7 x 103 14.6 a D Msun 1.99 x 1030 kg 1.99 x 1030 kg Vsun _ n 6.96 x 108m 3 1.412 x 1027 m3 1.409 x 103 kg m3 b D 1.99x 1030 kg 1.99 l0 kg 1 7 3 7--------- ------------ g- 0.594 x 1017 kg m3 2.00 x 104m 3.351x 1013m3 5.94 x 1016 kg m3 14.7 p - P0 Pgh h P-P0 Pg 1.00 x 105 Pa 1030 kg m3 9.80 m s2 9.91m 14.8 The pressure difference between the top and bottom of the tube must be at least 5980 Pa in order to force fluid into the vein pgh 5980 Pa h 82 59 80iNm2 0.581m gh 1050 kg m3 9.80 m s2 14.9 a pgh 600 kg m3 9.80m s2 0.12m 706Pa. b 706Pa 1000 kg m3 9.80 m s2 0.250m 3.16 x 103 Pa. 14.10 is a The pressure used to find the area is the gauge pressure and so the total area 16-5 x 103 N 805 cm - 205 x 103 Pa b With the extra weight repeating the above calculation gives 1250 cm2. 14.11 a pgh 1.03 x 103 kg m3 9.80 m s 250 m 2.52 x 106 Pa. b The pressure difference is the gauge pressure and the net force due to the water and the air is 2.52 x 106 Pa tf 0.15 m 2 1.78 x 105 N. 14.12 p pgh 1.00 x 103 kg m3 9.80 m s 640 m 6.27 x 106 Pa 61.9 atm. 14.13 a pa pgy2 980 x 102 Pa 13.6 x 103 kg m3 9.80 m s2 7.00 x 10 2 m 1.07 x 105 Pa. b Repeating the calcultion with y y2 - y1 4.00 cm instead of y2 gives 1.03 x 105 Pa. c The absolute pressure is that found in part b 1.03 x 105 Pa. d y2 -y1 pg 5.33 x 103 Pa this is not the same as the difference between the results of parts a and b due to roundoff error . 14.14 pgh 1.00 x 103kg m3 9.80 m s2 6.1 m 6.0 x 104 Pa. 14.15 With just the mercury the gauge pressure at the bottom of the .
