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# physics questions

17. -46 points SerCP11 9.5.P.019.
A small ferryboat is 4.70 m wide and 6.70 m long. When a loaded truck pulls onto it, the boat sinks an additional 3.50 cm into the river. What is the weight of the truck?
KN
18.
-46 points SerCP11 9.10.P.068.
A 26.0 m long steel cable with a cross-sectional area of 2.05 x 10 m is used to suspend a 3.80 x 10 kg container. By how much will the cable stretch (in m) once bearing the load? (Young's modulus for steel is Y = 20 x 1010 pa.)
HINT
19.
-16 points SerCP11 9.XP.001.
A soap bubble hovers motionlessly in the air. If the soap bubble's mass, including the air inside it, is 1.63 x 10-4 kg determine the magnitude of the upward force acting on it.
N
20.
-46 points SerCP11 9.XP.003.
A 75.0-kg man lies on his back on a bed of nails, with 1,209 of the nails in contact with his body. The end of each nail has area 1.01 x 10-6 m2. What average pressure is exerted by each nail on the man's body?
Pa

Weight of truck=Total weight of water displaced Total weight... View the full answer

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