After the spring losses contact with both masses, the speed of m is the speed of 3m.

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2 Two masses, of size m and 3m, are at rest on a frictionless surface. A compressed, massless spring between the masses is suddenly allowed to uncompress, pushing the masses apart. m 3m After the spring losses contact with both masses, the speed of m is the speed of 3m. A) the same as B) twice C) three times D) four times E) none of these

3 Two masses, of size m and 3m, are at rest on a frictionless surface. A compressed, massless spring between the masses is suddenly allowed to uncompress, pushing the masses apart. m 3m What is the direction of the acceleration of the center-of-mass of the 2-mass system? A) to the right B) to the left C) the acceleration is zero.

4 Traction is sometimes used to prevent leg muscles from pulling a broken bone out of alignment after it s been set. What would we need to know to work out the tension in this rope? A) Wleg B) m C) θ D) Wleg and m E) Wleg, m, θ F) Yet more information m Russell system of traction

5 mg

6 I throw a ball in the air. While the ball is going up, is direction of the acceleration a) zero b) up c) down

7 I throw a ball in the air. While the ball is going down, is direction of the acceleration a) zero b) up c) down

8 I throw a ball in the air. While the ball is at the top of it s trajectory, is direction of the acceleration a) zero b) up c) down

9 A bungie jumper drops down, and springs back. What is the direction of her acceleration at the bottom of her trajectory? a) zero b) up c) down

10 A bungie jumper with a mass of 50 kg stretches her elastic cord 10 meters past it s equilibrium length at it s deepest. If the elastic cord has a spring constant of 1000 N/m, what is the jumper s acceleration at this moment?

11 Rope A Rope B Block 1 1 kg Block 2 1 kg pull Two identical blocks are sliding on a frictionless surface. Block 2 is being pulled by rope B, causing the blocks to accelerate at 1 m/s 2. The two blocks are connected by rope A. How do the tensions compare? (a) TA = TB (b)2 TA = TB (c) TA = 2 TB (d)3 TA = 2 TB (e) 2 TA = 3 TB (f) None of the above

12 A 50-kg person stands on a 25-kg platform. He pulls on the rope that is attached to the platform via the frictionless pulley system shown here. If he pulls the platform up at a steady rate, with how much force is he pulling on the rope? Ignore friction and assume g = 10 m/s N N N N N N N 8. impossible to determine

13 Going to hold a slinky from the top, then let it go. Watch the bottom of the slinky. Will it: a) Start falling immediately b) Move upward, then fall c) Stay still, then fall

14 Which of the following make sense? 1. A ball has a kinetic energy of 10 J to the west. 2. A ball has a momentum of 10 kg m/s to the west. 3. A ball has a potential energy of 10 J upward 4. A ball has a speed of 10 m/s to the west. 5. A ball has a velocity of 10 m/s to the west. 6. A ball has a mass of 10 kg to the west J of work are done on the ball to the west. 8. The ball rolled with a displacement of 10 m to the west. 9. The ball accelerates with 10 m/s 2 to the west.

15 A B Is the following statement true? A = B (a) Yes, it s true. (b)no, it s not true.

16 Can two vectors of unequal magnitude ever sum to zero? A: yes B: no

17 Can three vectors of unequal magnitude ever sum to zero? A: yes B: no

18 Three vectors, A, B, and C are shown. Which of the four vectors at the bottom is the sum of these three? (i.e. A+B+C?) A B C (a) (b) (c) (d)

19 Three vectors, A, B, and C are shown. Which of the four vectors at the bottom is the sum of these three? (i.e. A+B-C?) A B C (a) (b) (c) (d)

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