5. A baseball is popped straight up into the air and has a hang-time of 6.25 sec. Determine the height to which the ball rises before it reaches its peak. (hint: the time to rise to the peak is 1/2 the total hang-time) *

6. Two smooth disks A and B (masses 0.8 and 0.6 kg, respectively) move with velocities as pictured and collide in such a way that the coefficient of restitution is 0.75. Determine the velocities of each disk just after the collision. B (VB)1 = 4 m/s (VA)1 = 6 m/s A -X

13

4. A 2.0 kg block hangs from the end of a 1.5 kg, 1.0-m long rod, together forming a pendulum that swings from a frictionless pivot at the top end of the rod. A 10 g bullet is fired horizontally into the block where it sticks, causing the pendulum to swing out to a 30° angle. What was the speed of the bullet? (5 marks) m,-0.010 kg d=1.0 m m=1.5 kg mg2.0 kg Ves=0 m/s

* Question Completion Status: QUESTION 1 What is the maximum height a 25 kg object will travel if it is thrown straight up in the air at 100 meters per second (m/s) O 510.2 meters O 510.2 m/s O 1020.4 meters O 1020.4 O 510.2 O 1020.4 m/s QUESTION 2 What will the total time the object will be in the air? O 20.4 -10.2 seconds 0102ceconde Click Save and Submit to save and submit. Click Save All Answers to save all answers. PE159 Syllabus..dor

A Hot Wheels car rolls off a table at a speed of 2.57 m/s and hits the floor a distance of 0.816 m from the table's edge. (use g-9.8 m/s/s) Listen Determine the number of seconds the car is in the air. Your Answer: Answer Listen Determine the height of the table. Your Answer:

2. A 45.0 kg boy is initially seated on the top of a hemispherical ice mound of radius 20.0 m. He begins to slide down the ice, with a negligible initial speed. Assume the ice is frictionless. a. At what height does the boy lose contact with the ice. b. What is acting as a radial force?

10. A child begins to slide down from the top of a frictionless semi circular mound of ice of radius 5m. At what height above the ground will the child loose contact with the ice?

An object of mass m1 experiences a linear, elastic collision with a stationary object of unknown mass. In addition to m1, what is the minimum necessary information that would allow you to determine the mass of the second object? A. The final speed of object 1B. The initial speed of object 1C. The final speed of object 2D. Any 2 of the above values

The Moon is 60 Earth radii (i.e. 60 rEarth) from the center of the Earth and has a mass of 0.012 Earth masses (i.e. 0.012 mEarth) a. How many Earth radii is the center of mass (the “barycenter”) of the Earth-Moon system from the center of the Earth? b. Is the center of mass inside the Earth or outside the Earth? c. What point along the line from the center of the Earth to the center of the Moon orbits the barycenter of the Solar System in a (nearly) circular orbit (e.g. the center of the Earth, the barycenter of the Earth-Moon system, the midpoint, the center of the Moon)?