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The frictional (tangential) force applied to the foot of a runner is 470 N, directed posteriorly. At the same time an upward normal force of 1890 N acts on the same foot. What is the angle formed between the horizontal and the vector that is the resultant (sum) of these two forces acting on the foot? Give your answer to the nearest 0.1 degrees.
A) 14.0 degrees
45.0 degrees
C) 58.0 degrees
D) 76.0 degrees
The frictional (tangential) force applied to the foot of a runner is 420 N, directed posteriorly. At the same time an upward normal force of 1790 N acts on the same foot. What is the magnitude of the resultant (sum) of these two forces acting on the foot? Give your answer to the nearest 1 N.
A) 1790 N
1839 N
C) 1938 N
D) None
A golf ball is hit off the tee with a velocity of 30 m/s at an angle that is 40 degrees above the horizontal. What is the horizontal component of the ball's velocity? Give your answer to the nearest 1.0 m/s.
A) 30 m/s
28 m/s
C) 23 m/s
D) None
A pole vaulter (body mass = 62 kg) has just cleared the bar and is falling to the mat below. What is the pole vaulter's weight? Give your answer to the nearest newton.
A) 0.0 N
608 N
C) 638 N
D) None