motion of fluids
At what depth does atmospheric pressure double?
10 meters
the onset of turbulent flow happens for a reynolds number of about?
2300
the diameter of a pipe is tripled while the pressure difference across the pipe remains the same. the volume flow rate of the pipe increases by a factor of
81
what happens to a can when the atmosphere cools down?
A can will shrivel up when the atmosphere cools down because when the atmosphere cools down it exerts more force on the can.
what takes up more space, lead or mercury?
Lead takes up more space
If 2 objects have the same volume but different densitys, what is the buoyant force on the objects?
The same
why cant lemonade be sucked 20 meters through a straw?
atmospheric pressure cannot support a 20 meters tall
if a water powered go kart sprays water against a wall after it gets out of range of the wall, what happens?
continue to accelerate as the water sprays out of the back of the kart.
as the reynolds number increases
flow is going from being viscous dominated to inertia dominated and therefore turbulent
pressure potiential energy
has to dowith desribing moving water and is only an abstact concept.
when a stream of water hits a window, the water pressure is?
higher than atmospheric pressure abd the water's speed is slower than in the stream
when a unopened can of soda is floating motionless below the surface of the lake. what is the direction and amount of fource the water exerts?
it is up, and equal to the can's weight.
if a block is floating easily on the surface of a lake if the density and air pressure decrease what happens to the block?
it moves downward slightly and floats lower in the water.
a curve ball in baseball curves because of?
lift forces
if a golf ball were smooth rather than dimpled, it would
not travel as far after being hit by a club
gravity creates?
pressure gradients in fluids
dimples on a golf ball without spin
reduces drag
in a hot air balloon, if you havent used the burner for a while, why does why does the balloon sink.
the average density of the balloon became greater than the surronding air and the bouyant force on the balloon became less than its weight.
why does fuzz on a tennis ball help it travel farther when hit?
the fuzz "trips the boundary, causing turbulence everywhere around the ball
the pressure in a water pipe is always lower in regions where the water moves faster only when?
the pipe is level
the pressure in a water pipe may not be lower in regions where the water moves faster when?
the pipe is not level
when you squeeze the trigger of a water gun, water squirts out because
the pressure inside the gun is higher than atmospheric pressure.
what happens to a inflated ball when it comes into contact with cool water
the temperature drops and a increase in the density of the air inside the ball
cotton flashes and burns when compressed because?
the temperature increases when air is compressed
for an object that sinks in a fluid.
the weight of fluid displaced is less than the objects weight
the reason fast moving water makes noise is because?
turbulence
cities have to use water towers to supply water because?
water pressure at the bottom of the tower is much higher than at the top.
why are failures in dams more likely to occur closer to the bottom of the dam?
water pressure is higher at the bottom
what happens when the speed of the fluid is lower?
when pressure is lower then speed is lower
