The what is s measure of the number of waves that pass a point in a given amount of time

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Energy flows from the producer level to the level. is called

Ahot-air balloon is 11.0 m above the ground and rising at a speed of 7.00 m/s. a ball is thrown horizontally from the balloon basket at a speed of 9.00 m/s. ignore friction and air resistance and find the speed of the ball when it strikes the ground.