A soccer ball is rolling towards the net. It bounces off a goal post towards Amy, who passes the ball to Betty. Betty holds
the ball under her foot. Below is a graph of the ball's position
over time

a) How far was Amy standing from the goal post? Answer to two significant
digits.
(1)
b) How long did it take for the ball to reach Betty starting at time = 0 s.
Answer to two significant digits.
fol
of
(1)
Re
car
Ob
c) What is different about the ball's motion from 2 s to 4 s (from point B to
point C) compared to the motion from 4 s to 8 s (from point C to point D)?

Describe the path of the electric current through a circuit?

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?

Asmall 21 kilogram canoe is floating downriver at a speed of 1 m/s. what is the canoe's kinetic energy?