Question

1. Which has the greater density? Explain your answer. a) a cubic centimeter block of lead c) a cubic centimeter block of wood b) a cubic meter block of lead d) a cubic meter block of wood 2. Where do you need to put 40 kg to balance 70 kg that is located 50 cm from the pivot point? Assume the center of mass of what is holding the masses is located at the pivot point. 3. A can of frozen orange juice is given an initial velocity of 5.7 m/s to roll up the incline. Find the translational velocity when it reaches the highest point. You can ignore friction. V 1.2m 4. When the frequency of sound increases, what, if anything, of the sound changes? 5. A ball is thrown straight up. What is its acceleration at the highest point? 6. How long does it take for a toy top to slow from an initial rate of 30.0 rad/s at a rate of 0.800 rad/s?? How many revolutions does it make before stopping? 7. A 4.00 x 10ʻ kg subway train is brought to a stop from a speed of 0.400 m/s in 0.400 m by a large spring bumper at the end of its track. What is the force constant k of the spring? 8. An ice cube floats in a glass of water. As the ice melts, what happens to the water level?

Answer 1