THIS IS JUST A PRACTICE TEST….POINTS DO NOT ADD UP TO 100

 

PRACTICE EXAM 1 – Spring 2008                                             PHYSICS 1201

 

SHOW ALL WORK NEATLY AND PUT A BOX AROUND YOUR ANSWERS

 

Name______________________

 

 

 

Fd = (Cd/2)Arv2                      FMag =  (CMag/2)Arwrv                       

 

 

Singles  (4 points each) 

 

  1. You are driving a car in Europe and you notice that the speed limit is 100 km/hr.  What is the speed in mi/hr?

 

 

  1. A ball is thrown straight up into the air with a speed of 15 m/s.  When the ball reaches its maximum height, what is the speed of the ball?

 

  1. For the ball thrown in problem #2, what is the acceleration of the ball at its maximum height?

 

Doubles  (5 points each)

  1. In order to preserve safety and/or the integrity of the games of golf and college/youth baseball, bats, golf clubs, and golf balls are designed with an upper limit to what physics parameter?  This parameter is specifically mentioned as part of the official rules of the game of golf.

 

  1. Determine the mass of a physics professor who weighs 150 lbs here on earth.  Be sure to use the standard unit of mass.

 

  1. During a successful baseball or golf swing, which parameter is maximized at the point of impact; (a) hand speed or (b) bat/club speed?

 

 

  1. Draw the following three baseball trajectories and label as shown below.  Assume that each ball is hit with the exact same initial speed at the exact same angle, label them A, B, and C based on the 3 described trajectories below.

(A)    Ideal projectile motion

(B)     Ball hit with backspin

(C)     Ball hit with topspin

 

 

Home Runs  (10 points each)

  1. A baseball pitcher throws a curveball with an initial speed of 75 mi/hr and a rotational speed of 1500 rpm.  Determine the magnitude of the air resistance force and the Magnus force acting on the ball.  Which is greater and by what percentage?

 

 

 

  1. A tennis ball is hit with an initial speed of 120 mi/hr.  If the tennis ball weights 2 oz. and has a coefficient of drag equal to 0.4, determine the deceleration of the ball as a result of air resistance.
  2. Draw a soccer ball after it is kicked with top spin.  Be sure to indicate the direction of velocity of the ball. 

a)                  Draw a vector indicating the velocity of the kicked ball.

b)               Label all forces acting on the airborne ball.

c)               Explain the physics of the Magnus force acting on the ball.  Draw another diagram if necessary, or use the diagram you’ve already drawn to indicate any features that are salient to your discussion.