Consider three force vectors Ē with magni- tude 42 N and direction 130°, Ē, with mag-
nitude 22 N and direction -59°, and Hz with
magnitude 14 N and direction 46º. All direc-
tion angles are measured from the positive
axis: counter-clockwise for 0 > 0 and clock-
wise for Ꮎ < 0.
What is the magnitude of the resultant vec-
tor = R1 + R2 + 73 ?

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

Asystematic approach to problem solving is called a (an)

A1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. what is the magnitude of the friction force required to keep the car from sliding?