SMDEPPhysicsClass23e dit

SMDEP Physics: 

SMDEP Physics Fluids: Buoyancy, Bernoulli http://www.astro.yale.edu/krines/smdep

Survey: What day do you want the review quiz (next week)?: 

Survey: What day do you want the review quiz (next week)? Monday Tuesday Wednesday Thursday

Admin Issues: 

Admin Issues Answers to [optional] review questions available on Monday ‘Dinosaur’ group results on Monday Office Hour today 5:30-6:30 pm Reading for tomorrow and next week: Skip over any difficult equations and unfamiliar terms (Skim Ch 33-4). Add Ch 35-3 to reading for Monday

Ch 13, #38: fraction of iceberg above water: 

Ch 13, #38: fraction of iceberg above water 11% 89% 6% 22% Other Didn’t finish

Ch 13, #45: speed of water out of hole: 

Ch 13, #45: speed of water out of hole 3.0 m/s 6.8 m/s 68 m/s 9.5 m/s Other Didn’t finish

Ch 13, #52: pressure in hurricane? : 

Ch 13, #52: pressure in hurricane? 9.7 x 105 Pa 9.7 x 104 Pa 1.1 x 105 Pa 4.3 x 104 Pa Other Didn’t finish

Imagine holding two bricks beneath the surface of water. Brick A is held close to the surface, and Brick B is held deeper. The force needed to keep brick B in place is _____ the force to keep brick A in place.: 

Imagine holding two bricks beneath the surface of water. Brick A is held close to the surface, and Brick B is held deeper. The force needed to keep brick B in place is _____ the force to keep brick A in place. Larger than The same as Smaller than [need more info] A B

Which weighs more?: 

Which weighs more? A bathtub filled to the brim with water A bathtub filled to the brim with water with a battleship floating in it Both weigh the same

Two cups are filled to the same level. One has plastic balls floating in it. The density of the balls is one-half that of water. Which cup weighs more?: 

Two cups are filled to the same level. One has plastic balls floating in it. The density of the balls is one-half that of water. Which cup weighs more? The cup with plastic balls floating in it The cup without plastic balls Both weigh the same

A 200-ton battleship enters a lock. The ship fits in so tightly in the lock that only 100 tons of water is trapped in the lock. Can the ship still float if the quantity of water left in the lock is less than the weight of the ship?: 

A 200-ton battleship enters a lock. The ship fits in so tightly in the lock that only 100 tons of water is trapped in the lock. Can the ship still float if the quantity of water left in the lock is less than the weight of the ship? Yes, as long as there’s enough water to reach the ship’s waterline. No, the ship touches bottom because it weighs more than the water in the lock.

A boat floats in a small pond. A person on the boat throws a heavy boulder out of the boat and it sinks to the bottom of the pond. Does the water level in the pond rise or fall (with respect to the shore)?: 

A boat floats in a small pond. A person on the boat throws a heavy boulder out of the boat and it sinks to the bottom of the pond. Does the water level in the pond rise or fall (with respect to the shore)? Rise Fall Remain the same Can’t tell without knowing density of rock

Consider an object that sinks in oil but floats on water. When the object floats on water, half of the object is submerged. If oil is now poured slowly on top of the object until the oil covers the object, the object:: 

Consider an object that sinks in oil but floats on water. When the object floats on water, half of the object is submerged. If oil is now poured slowly on top of the object until the oil covers the object, the object: Moves up (relative to the water) Moves down deeper in the water Remains in the same place