Where is the pressure greater, one meter beneath the surface of Lake
Michigan or one meter beneath the surface of a swimming pool?
☐ Lake Michigan
☐ swimming pool
☑ the same
The buoyant force of a submerged object always equals:
☐ the weight of the object
☐ the net force on the object
☑ the weight of the water that would otherwise
occupy the object's space
(Caution: this
one requires some careful thinking.) A cannonball sits in a boat on a lake. A person
then throws it overboard and the ball sinks to the bottom of the lake. Compared to when the
cannonball was in the boat, will the overall water level of the lake as measured on
the shore rise, fall or stay the same?
☐ rise
☑ fall
☐ stay the same
Ralph measures the pressure in his flat tire with a standard automotive
pressure gauge. The gauge reads zero. Should Ralph really believe that the
pressure inside the tire is zero, or should he not? Explain.
The gauge measures *differences* in pressures, not the real pressure values. To get the pressure inside the tire, you have to take the gauge pressure + atmospheric pressure. So... no, Ralph, the pressure inside is not really zero.