Two forces produce equal torques on a door about the door hinge. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force has a greater magnitude?

A uniform ball is released from rest on a no-slip surface (i.e. there is friction), as shown in the figure. After reaching its lowest point, the ball begins to rise again, this time on a frictionless surface. When the ball reaches its maximum height on the frictionless surface, it is

A Christmas ornament made from a thin hollow glass sphere hangs from a small hook at its surface. It is observed to oscillate with a frequency of 2.50 Hz in a city where g = 9.80 m/s2. What is the radius of the ornament? The moment of inertia of a hollow sphere of mass M and radius R about a point on its edge is 5MR2/3.

To what is the ORANGE arrow pointing? _______ To what structure is the GREEN arrow pointing? _______

A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth’s gravity?

 El estudiante _________ preocupado por el examen final.

VO-lei-bol

X.  Vocabulary and expressions. 46.  Which of the following questions are in the “usted” form?  Choose all that apply.  

4. ¿De quién son los cuadernos?

IV. Los números.  Indicate whether each equation is correcto or incorrecto 16.   6 x 3 = veintiuno