Two children are tugging on two ends of a rope in a tug of war.  The children are stationary.  If child 1 pulls with 83 N of force, what force must child 2 exert?  Explain why? 

You wish to raise a 10,000 kg shipping container from a dock straight up by 25 m onto a ship.  You have a 500 m long ramp and a pulley system with 6 pulleys.  You can use either the pulleys or the ramp to lift the container.   Which would be the easiest to use?  Justify your answer with calculations!

A 0.054 kg toy seal is attached to one end of a spring, which has a spring constant of 42 N/m. The other end of the spring is attached to the bottom of a full tank of water.  The seal has a volume of 0.00004 m3 and is completely submerged in the water.  Will the toy seal float, sink, or remain stationary? If the toy seal sinks or floats, determine how far the spring will compress or stretch?

I kicked a soccer ball and noted that the acceleration it felt was 48 m/s2 and the force I applied was 6 N.  What was the mass of the soccer ball?

How many unit exams will I take in this course?

A 4 kg watermelon is thrown with an initial horizontal velocity of 5 m/s and an initial vertical velocity of 7 m/s. Which of the following statements are TRUE while the watermelon is moving through the air? (You can select more than one.) The watermelon’s horizontal velocity will never change The watermelon will have zero vertical velocity at some point The watermelon will not experience the pull of gravity The watermelon’s horizontal velocity will change The watermelon will be weightless

A 1500 kg car is initially moving at 5.2 m/s then slides to rest in an azaelia bush. The slide lasts for 2.6 s.  Determine the acceleration and work done on the car. 

You and a friend are having an argument about two falling objects.  Your friend says that if object 1 falls straight down and object 2 falls from the same height but is also initially pushed sideways then object 2 will take longer to hit the ground because it is moving sideways.  Due to your Phys 105 training you know this is not correct.  Please give a brief description of what actually occurs and why.

A 3.56 kg iguana gets too cold and falls off of a 5.8 m tall tree and falls straight down.*   How long will it take the iguana to reach the ground? How fast will the iguana be moving just before it hits the ground?   *No iguanas were harmed in the writing of this exam.

A stone has a mass of 900 kg and a volume of 0.91 m3. Determine the density of this stone AND if it would float in water. Would the stone float, sink, or remain stationary if it were placed in olive oil with a density of 917 kg/m3?