When is the angular momentum of a system constant?
A) Only when its total kinetic energy is constant.
B) Only when the linear momentum and the energy are constant.
C) Only when no net external torque is exerted on the system.
D) Only when the moment of inertia is constant.
Question 2
Mort stands on Earth. Velma moves away from him in a rocket, at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma. As the tip of the beam passes her rocket, Velma observes that
A) the laser beam moves past her at just 1000 km/s.
B) the laser beam moves past her at 300,000 km/s.
C) Both of the above.
D) the laser beam never catches up with her.
E) Mort has turned into a giant frog.
Digestive system.
The Geometry of a Total Solar Eclipse
Interrelationships of the integumentary system with other body systems
digestive system
The urinary system.
Wind energy