You hold a softball in the palm of your hand and toss it up. For each of the following situations, specify the system and draw a motion diagram and a free-body diagram.
Label all forces with their agents, and indicate the direction of the acceleration and of
the net force. Draw vectors of appropriate lengths. Ignore air resistance.
a. After the softball leaves your hand, it rises, slowing down.
b. After the softball reaches its maximum height, it falls down, speeding up.
c. You catch the ball in your hand and bring it to rest.

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?