When a.22-caliber rifle is fired, the expanding gas from the burning gunpowder creates a pressure behind the bullet. This pressure causes the force that pushes the bullet through the barrel. Suppose the barrel has a length of 0.699 m and an opening whose radius is 2.65 x 103 m. A bullet (mass = 2.6 x 10³ kg) has a speed of 428 m/s after passing through this barrel. Ignore friction and determine the average pressure of the expanding gas. Number Units

An aquatic organism needs to be neutrally buoyant to stay at a constant depth. Fish accomplish this with an internal swim bladder they can fill with air that they take in from the water through their gills. One complication is that the pressure in the swim bladder matches that of the surrounding water, but the water pressure changes with depth. Because the volume of a gas is inversely proportional to pressure (as you may already know if you have studied the ideal-gas law), the volume of air in a fish's swim bladder decreases with depth unless the fish actively adds more air. ▼ Part A Consider a 3.9 kg freshwater fish whose tissues have an average density of 1050 kg/m³. To what volume in mL must the swim bladder be inflated for the fish to be neutrally buoyant at the surface? Express your answer in milliliters to two significant figures. AV = Submit VD] ΑΣΦ Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining ? mL

You have a tube where water enters at a velocity of 10.0 m/s, ascends 5.0 m, and then exits. The pressure pushes the water in at 250 kPa, and is measured come out at 150 kPa. The outcoming water is, faster than the incoming water. slower than the incoming water. the same speed as the incoming water.

A hand-driven tire pump has a piston with a 2.1 cm diameter and a maximum stroke of 24 cm. (a)  How much work do you do in one stroke if the average gauge pressure is 2.1 × 105 N/m2?  (b)  What average force do you exert on the piston, neglecting friction and gravitational force?