1. The biceps muscle exerts a muscle force of 1000N on the forearm, as per the picture below. The
muscle force acts at an angle of 30deg to the forearm. How large are the horizontal and vertical
components of this force that holds the forearm in place? (Show all work)
2. A man weighs 400N and is climbing up a hill that is 30deg, as per the picture below. (Show all
work)
Draw the free body diagram.
What is the friction force?
What is the coefficient of friction?
3. The average horizontal velocity of a baseball throw from the pitcher’s mound to the catcher is
95mph. The distance from the pitcher’s mound to the catcher is 65ft. How many seconds does it
take for the ball to reach the catcher after the pitcher throws it? (Show all work)
4. A quarterback throws the football down the field at a velocity of 25 m/s at an angle of 30deg.
You can assume that air resistance has no effect on the throw and that the height of landing is
equal to the height at release of the football. (Show all work)
How many seconds is the ball in the air?
How many yards did the quarterback throw the ball down the field?
5. A golfer hits a 50g golf ball with a golf club that weighs 200g. At the point of impact, the golf
club has a velocity of 100mph. assume the coefficient of restitution is 0.80. How fast is the ball
moving after impact? (Show all work)
