Luke is a 225-pound professional rugby player who normally speaks with a deep voice. Yet when he talks to his baby daughter Rae, his voice takes on a higher pitch and a singsong quality. Why?

Which process allows green plants to control the amount of water stored in their leaves? I forgot!

A train travels 51 kilometers in 2 hours, and then 53 kilometers in 5 hours. What is its average speed?

A potential energy function is given by u (x) = (3.00n) xâ (1.00n/m2) x3. at what position or positions is the force equal to zero?

if a boat was moving at a velocity of 30 m/s to the south and it sailed for 30 minutes, what was the displacement of the boat?

A lake that stores water for human use is called

Along some shorelines, incoming waves cause the water to simply rise and fall rather that form a surf zone. What does this tell you about these shorlines?

Which word best describes the rate at which work is done? work energy power velocity

Explain why a valve would last longer in the pulmonary position than in the aortic position

Think about the process of heating water, the heating and upward motion of hot steam and air, and the spiral spinning. For these events, list each form of energy associated with the heat source, the water, the steam and air, and the spiral.

A long rope with mass m is suspended from the ceiling and hangs vertically. A wave pulse is produced at the lower end of the rope, and the pulse travels up the rope.