exam 3 Flashcards
If a beam is in static equilibrium, where along is the net torque about zero?
all points on the beam
Different distances from the center of the axis impacts…
angular momentum, rotational kinetic energies, and rotational inertias
What can change angular momentum?
impulse
How does the decrease in the surface area affect the pressure of a given force?
it increases the pressure
So for a given force, if you decrease the area by a factor of two, the pressure would…
increase by a factor of two
If a metal cube is dropped into a glass of water and comes to rest on the bottom. The magnitude of the buoyant force on the metal cube is:
less than its weight
A metal cube at rest on the bottom of a glass, the net force on the metal cube is:
zero
What is the formula for pressure?
force/area
Water is flowing from the end of a garden hose. Placing your thumb over half the opening will change the waters…
speed
Two forces of the same magnitude act on a door. Is it possible for them to cause different torques about the hinge?
yes, if they act in different distances from the hinge or if they act in different directions
When an ice skater brings her arms in closer to her body, what happens?
her rotational inertia decreases and her angular speed increases
The ______ the inertia, the ________ of the angular speed.
slower; faster
How does a decrease in surface area affect the force it exerts on a table?
is stays the same
g to kg?
three spaces to the left
cm to m?
two spaces to the left
