As Betty waits, she counts the number of waves that pass her during a 1- second period; she counts just 1. She estimates that the distance between
crests is 6 meters. Betty sees the perfect wave and begins paddling. She
pushes herself up, stands on the surfboard and rides the wave all the way
in to shore, a distance of about 60 meters. It takes her about 10 seconds
to ride the wave in. (A) Use 2 methods to calculate the speed of the wave
based on the information presented. What speeds did you calculate? (B)
Are they the same? (C) In complete sentences, explain how you got your
answers.
*

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?