Physics 2

Which temperature scale has 373 degrees as the boiling point of water

Kelvin

At the do it yourself car wash on Route 17 you can have 3 minutes of "high pressure spray" to clean your vehicle. What is the pressure of the water when it hits your shiny fenders?

One atmosphere (100,000 Pa). The extra pressure from the machine was converted to velocity when the water exited the nozzle.

Why does a tennis ball not slow down very quickly when hit?

The fuzz causes laminar flow in the boundary layer of air

An astronaut is in orbit in the international space station, why does an astronaut feel weightless?

because she and the station are accelerating at the same rate

which fundamental law of physics provides the primary basis for Bernoulli's principle that pressure and velocity can be exchanged in a flowing fluid

conservation of energy

Based on our in class discussion, we know that the high quality gold jewelry will be

denser

a curve ball pitch in baseball curves because of

drag forces

Doubling the flow velocity in a water pipe will increase the kinetic energy of the stream by what factor?

four times

The maximum speed a practical single stage rocket can achieve is

greater than the speed of its exhaust plume but less than is required for most satellite launches

When one of the F-22 Raptor fighters at Langley AFB launches a rocket powered weapon what does the missile push against to accelerate away from the airplane

its own exhaust

To make an airplane fly upside down the pilot must

point the nose of the plane slightly up to create a positive angle of attack on the "wrong" side of the wing

Although a perfectly smooth golf ball (without aerodynamic dimples) will have a terribly short range its reduced lift will offer what advantage to an amateur player?

reduced sideway curving flight

pure turbo jet engines are fuel hogs compared to propellers because

the jet imparts a bigger velocity change to a smaller mass flow of air to generate thrust

The driver of a ski boat can feel the effect of the skier's antics. When the skier turns hard to left or right, the boat slows down slightly because

the skier increased his drag when he generated the lift needed to accelerate him from side to side

Archimedes principle states that the buoyant force exerted by a fluid on an object wholly or partially immersed in it is equal to

the weight of the fluid displaced by the object