ef152-rec-2-1

# ef152-rec-2-1 - EF 152 Physics for Engineers Spring 2009...

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EF 152 – Physics for Engineers Spring, 2009 Recitation 2.1 Statics Task 1. The class favorite - concept questions! 1. A (static) mobile hangs as shown below. The rods are massless and have lengths as indicated. The mass of the ball at the bottom right is 1 kg. What is the total mass of the mobile? a. 5 kg b. 6 kg c. 7 kg d. 8 kg e. 9 kg 2. A bungee jumper momentarily comes to rest at the bottom of the dive before she springs back upward. At that moment is the bungee jumper in equilibrium? a. Yes b. No c. Note enough information 3. A ladder is leaning against a wall. If you were going to climb the ladder are you better off if there is no friction between the ladder and the wall or no friction between the ladder and the floor? a. No friction between the ladder and the floor b. No friction between the ladder and the wall c. Does not matter Task 2: Fun with a 2x4 A. Hang a 5 lb weight to the end of an 8 ft long 2x4. Now balance the system. Measure the distance from the end of the 2x4 to the balance point. From this information, determine the weight of the 2x4.

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## This note was uploaded on 04/07/2009 for the course EF 152 taught by Professor Ab during the Spring '08 term at University of Tennessee.

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ef152-rec-2-1 - EF 152 Physics for Engineers Spring 2009...

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