Home | LBCC



Principles of TechnologyDue Friday, 6/09/17PLEASE REVIEW THE HOMEWORK GRADING CRITERIA BEFORE BEGINNINGHW 7: Density, Force & Pressure1. Find the mass density (g/mL) of a chunk of rock of mass 215 g that displaces a volume of 75.0 mL of water.2. A block of wood is 55.9 in. x 71.1 in. x 25.4 in. and weighs 1810 lb. Determine its weight density (lb/ft3)3. A piece of aluminum of mass 6.24 kg displaces water that fills a container 12.0 cm x 12.0 cm x 16.0 cm. Find its mass density in kilograms per cubic centimeter.4. If a block of wood of the size in Problem 2 has a weight density of 30.0 lb/ft3, how many pounds does it weight?5. If 108 in3 of ammonia gas weight 0.00301 lb, a) find its weight density(lb/ft3) , and b) its specific gravity.6. A filled water tower sits on the top of the highest hill in a town (see figure below). The cylindrical tower has a radius of 12.0 m and a height of 50.0 m. Answer the following questions:3517904508500a. Find the total force (in newtons & pounds) on the bottom of the water tower.b. Find the total force on the sides of the water tower.c. Find the pressure (in kPa & lbs/ft2 ) on the bottom of the water tower.d. What is the water pressure (in kPa & lbs/ft2) at the fire station?e. What is the water pressure (in kPa & lbs/ft2) at the school?7. A cylindrical grain silo 24.0 ft in diameter is filled with corn whose weight density is 45.1 lb/ft3. The floor of the silo can support 94.0 lb/in2 of pressure. How tall (feet) can the bin be filled with corn and not exceed this pressure?8. From the diagram of the hydraulic jack in in the figure below, determine:a. the pressure (psi) on the small piston.b. the pressure (psi) on the large piston.c. the total force (pounds) on the large piston.d. the mechanical advantage of the jack.44767580010009. A metal alloy weighs 81.0 lb in air and 68.0 lb when under water. Find the buoyant force (lbs) of the water. Be sure to JUSTIFY your answer.10. A rock displaces 1.21 ft3 of water. What is the buoyant force (lbs) of the water?11. A flat-bottom river barge is 30.0 ft wide, 85.0 ft long and 15.0 ft deep.a. How many ft3 of water will it displace while the top stays 3.00 ft above the water?b. What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock? ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download