Honors Review Stuff

1.) A package of yum yum cup cakes weighs 28N. A person (78kg) carries the package from the bottom of a building to the fifth floor, 25 meters upward. How much total power was exerted if the trip took 33s?

2.) Tom Cruse from the hit 80’s movie “Top Gun” is on a swing suspended .2m off the ground. His wife (Katie Holmes) pulls back on the swing so that it is .8 meters off the ground. At what speed will Tom have at the very bottom of the swing?

3.) Which is more efficient and why, a car or a bicycle? Can you make anything be 100% efficient, why?

4.) A very overweight cat named Poopsomes has a mass of 9.5kg. Poopsomes is sitting on a kitchen table that is .78m high. A.)Poopsomes sees a mouse on the ground and jumps down from the table. Find the PE and KE for Poopsomes at .15m from the floor. B.) If Poopsomes lands on the poor mouse and compresses it .02m, what is the force she exerted on the mouse?

5.) Here in CT roads go straight up hills but out in the Rocky Mountains (which are much higher) the roads are zigzagged going up. They say it’s to reduce stress on less powerful cars and trucks. What’s the reasoning behind this?

6.) Harry Potter (88kg) fell out of a tree (where’s your magic now) 44.0 m above the ground. (a) With what speed would it hit the ground if air resistance could be ignored? (b) If it actually hits the ground with a speed of 9.1m/s what is the average force of air resistance exerted on it?

7.) Jimmy Dean fires two identical arrows, one with twice the speed of the other, are fired into a bale of hay. Assuming the hay exerts a constant frictional force on the arrows, the faster arrow will penetrate how much farther than the slower arrow? Explain.

  1. A gunslinger points a gun straight with no angle aimed at a soup can 700m away. The can is dropped at the same time the bullet is fired. What happens? Explain your answer.
  2. A cute hamster in a ball rolls off of a cliff (that’s 800m tall), down to certain doom. If the ball leaves the cliff at a speed of 3.9m/s how far from the cliff should you place a net to catch the poor guy?
  3. You’re on a train in Germany. The train is at rest. On the tracks next to you another train goes whizzing by. During that time you see in one of the train windows a little girl throw a ball up in the air and catch it in her hands. What does the motion path look like to her on her train? What does it look like to you on your train?
  4. A plane is flying North from Florida along the coast at a speed of 211m/s. A hurricane is blowing a Westerly wind at 61m/s. What is the overall speed of the plane? How far inland will the plane be blown if it has been flying for 440 seconds?
  5. You’re on an island looking for treasured using a list of directions. Then Captain Hookbeard captured you and messed up the order of your directions. You then are released because he believes you can no longer find the treasure. The only thing you can remember is the first direction. Can you still find the treasure? Explain.
  6. Sir Conan J Pilkington the 3rd is in a grapefruit-throwing contest. Standing on a tower he throws a grapefruit at a speed of 12m/s. It lands 56.3 meters from the base of the tower. How tall is the tower?
  7. You’ve been given the task of making a slingshot that fires water balloons. The slingshot needs to be set at a fixed angle and fires the balloons at a set velocity. What angle would you set this apparatus at to get the maximum distance? Explain your answer.
  8. A tank’s gun is pointed at a 35º angle. When it fires the projectile leaving the barrel has a speed of 289m/s. How long is the projectile in the air? What is its maximum height? How far did it go? What is the acceleration on the shell?

Indiana Jones is flying in a bi-plane 355m in the air. The Nazis are hot on his tail. He needs to drop supplies to his friends on the ground. His speed (horizontally) is 124m/s. How far away must he drop his supplies so they can reach his friends on the ground?

1.) Two locomotives approach each other on the same track. Each has a speed of14m/s. If they are initially 870m apart, how long will it be before they reach each other?

2.) You’re driving your hot new sports car on the German autobahn, a highway with no speed limits. You look down at you speedometer at see that you are moving at 260Km/h. Is this your instantaneous speed? Explain your answer.

3.) Jimmy Fontan kicked a soccer ball into the air with a velocity of 35m/s. What is its time in the air and in what speed will it hit the ground with?

4.) 4.) Look at the following graphs.

Graph A Graph B

For each graph find the following. What is the direction of the velocity? Is the object speeding up, slowing down or neither? Is the object accelerating and if so what direction?

5.) How come when we (America! Not Communist Russia) landed on the moon NASA used booster rockets and not a parachute?

6.) A 1210m long cruse ship begins uniform acceleration from rest. The front of the boat has a speed of 10m/s when it passes a sailor who is standing 400 m from where the front of the boat started. What will be the speed of the boat as the rear passes the sailor?

7.) You’re sitting in a chair in a classroom eating the vanilla section of a SkyBar. Are you moving? Explain your answer.

8.) A person jumps from a fourth-story window 15.0 m above a firefighter’s safety net. The person jumps upward out of the window with a velocity of 5m/s. How long is the person in the air before they hit the safety net?

9.) A falling stone takes 0.28 s to travel past a window 2.2 m tall. From what height above the top of the window did the stone fall?

  1. An 11kg box of cheese nips is sitting on a table .24m from the edge. A massless string is attached to the box and is run over a frictionless pulley. The (between the box and the table) coefficient of static friction is .54 and kinetic friction is .33. A.) How much mass is needed to be hung at the end of the string to have the box begin to move? B.) What is the velocity of the box right before it falls off the table?
  1. Suppose that you are trying to push over a sumo wrestler.You push him as hard as you can with a force of 300N? What minimum coefficient of static friction must exist between his feet (his body mass is 111kg) and the mat if he’sis to be unmoved?
  2. Wilbur asks Mr. Ed, the talking horse, to pull a cart. Mr. Ed replies that he would like to, but the laws of nature just won’t allow it. According to Newton’s third law, he says if he pulls on the wagon it pulls back on him with an equal force. Clearly, then, the net force is zero and the wagon will stay put. How should Wilbur answer the clever horse? (Drawing a force diagram may help)
  3. A person stands on in a motionless elevator; they have a mass of 81Kg. When the elevator begins to move, they feel 12N lighter. Calculate the acceleration of the elevator, and find the direction of acceleration.
  4. What would your bathroom scale read if you weighed yourself on an inclined plane? Less/more/the same?Explain your answer?
  5. Since the year 2000 the U.S. Government required all carmakers to increase the height of car seat head rests. Some people don’t like it because they think it’s uncomfortable. However, experts say it’s much safer, and will reduce injury, why?
  6. Greedy McMoneysburg finds himself stuck in the middle of a cursed frozen lake with a big sack of gold coins. The curse is that the lake’s surface is frictionless thus he can’t move! What must Greedy do in order get off the lake?
  7. Batman punches a panda (it’s an evil panda). His fist travels at a speed of 21m/s before stopping in the panda’s stomach (he’s wearing his bat gloves which have a mass of 1.8kg). If Batman’s fist pushes the panda’s stomach inward .24m, how much force did Batman’s punch produce?

1.You are a shepherd in olden times. You meet a boy named David who tells you he’s going to fight a giant with his sling. However, when you watch the boy you notice that he has no aim and the rock never seems to go the direction he wants it to. What advice do you give him in order to improve his aim? Drawing pictures may help

2.DerkSlabwell is the toughest guy in tough town. He spins a 3.3kg rock tied to a string 1.2 meters from his hand horizontally above his head. If the string has a breaking strength of 3200N how fast must Derk spin the rock in order for the rock to breakaway?

3.While watching the news you see a story in which the reporter says, “It was centrifugal force that caused the ice-cream truck to fly off the road because it went around a corner to fast.” Being a person of science you march down to the TV station and tell the reports the TRUTH behind centrifugal force and what really happened. What did you tell the reporter?

4. Donkey Kong has a mass of 145kg and swings on a vine (length 2.1m) in a complete vertical circle. A.) What is Kong’s minimum speed needed to complete the top of the circle? B.) What will be the tension on the vine when Donkey Kong is at the bottom of the circle?

5. A large man and a small girl are on a seesaw. If the girl was sitting all the way at one end of the seesaw, would the large man have to sit closer or farther from the pivot point so they were balanced? Explain your answer (hint: think about toque)

6. A game disk (radius .21m) is inserted into an Xbox 360. IF the disk has an angular velocity of 90m/s how many revolutions will the disk have spun in 10 seconds?

7.When you look at the back tire of a multispeed bicycle you see there are different sized sprockets. Which sprocket would make the bike move faster, large or small? Explain you answers. Why is it harder the pedal with the smaller one?

8. What is the maximum speed that a Corvette (mass 1800Kg) can have when taking a 47m curved corner while the road’s surface has a μ=.71?

  1. A 2575-kg van (stupid hippies) collides into the back of an 825-kg compact car (stupid tree hugging hippies) at rest. After the collision, they stick together and both move at 8.5 m/s. What was the initial velocity of the van?
  2. Back in the day people that lived near the ocean would see the moon as a God that took the tide away. Using your 2012 smarts explain what they were actually seeing?
  3. A UPS 2033-Kg truck filled with children’s presents and explosives crashes into an orphanage. The force the truck experienced was 217,345-N. If the crash took a total time of .32 seconds then how fast as the truck moving before the accident?
  4. Cars used to be built as rigid as possible to withstand collisions (ahh the good old days). Today, though, cars are designed to have “crumple zones” that collapse upon impact. What is the advantage of this new design?
  5. A .023-kg bullet traveling 230m/s penetrates a 2.0-kg block of wood and emerges cleanly at 170m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges?
  6. In the game of pool the “cue” (the white ball you use to hit the other colored balls) is slightly heaver than the others. People say this makes the game more challenging. Explain why.
  7. A very small planet in the Forbidden Nebula (in the galaxy of terror) has a mass of 6.2x1017 kg and a radius of 475000m. What is the acceleration due to gravity on the planet’s surface?
  8. We still do not know why objects have gravity. However we do have a pretty cool theory of how it works. Explain this. Also when looking at gravity what is the biggest controlling factor in how strong the pull of gravity is?
  9. A bullet is fired vertically into a 1.40-kg block of wood at rest directly above it. If the bullet has a mass of .031-Kg and a speed of 510m/s, how high will the block rise after the bullet becomes embedded in it?
  1. What is speed?
  2. What is the difference between speed and velocity?
  3. What is acceleration?
  4. Can you system have negative potential energy why?
  5. What is a vector?
  6. What is a scalar?
  7. Where does gravity come from?
  8. What factors affect an object gravitational pull?
  9. Why does a gun push back when it fires?
  10. What is weight?
  11. What is friction?
  12. Newton’s Laws?
  13. Two ways to change an objects momentum?
  14. Why do objects fall at the same rate on the moon?
  15. What is work and how can it be done?
  16. Does a spoke on a spinning wheel do work?
  17. You throw a ball up into the air, at what speed will it return to you hand?
  18. What is a ball’s acceleration at the top of its path being thrown up?
  19. What direction is the acceleration of a car goring around a corner?
  20. How does a slingshot work?
  21. What is PE, KE?
  22. What is the only force that makes a car move forward?
  23. Where would you weight more, earth or Saturn?
  24. At what angle can you fire a football the farthest?
  25. What is Power?
  26. Why is follow-through important in boxing?
  27. Why is it hard to start pushing something that still than to push it when it’s already moving?
  28. Why are speedometers inaccurate?
  29. Is the earth falling into the sun, explain?
  30. KNOW YOUR UNITS!!
  31. Two balls released at the same time, one dropped directly down and the other thrown to the side, which hits the ground first?

Study your tests and notes!

A .08kg rubber band is stretched .20m from it’s relaxed state (k=137N/m). At what speed will it leave the pullers finger?

Answer: about 8m/s

Agent Maxell Smart (87kg) is suspended by a rope (mass-less) directly under a stationary helicopter, A.) What is the force Max exerts on the helicopter? B.) Then the helicopter accelerates to 12m/s (in the y direction) in 3s. What is the force felt by agent Smart?

Answer: 852.6N and 1200.6N

Sir Conan J Pilkington the 3rd is in a grapefruit-throwing contest. Standing on a tower he throws a grapefruit at a speed of 12m/s. It lands 56.3 meters from the base of the tower. How tall is the tower?

Answer: 108.24m

An 11kg box of cheese nips is sitting on a table .64m from the edge. A massless string is attached to the box and is run over a frictionless pulley with a 4kg mass hanging at the end. A.) What is the acceleration of the system? B.) What is the velocity of the cheese nip box right before it falls off the table?

Answer: 2.61m/s and 1.83m/s

Wile E. Coyote (62Kg) is trying to catch that Road Runner. He makes himself a huge slingshot to fire himself at the bird. If the Road Runner’s top speed is 44m/s, how far back must Wile pull the rubber band to move as fast as the Road Runner? (spring constant for ACME giant rubber band k=768N/m)

Answer 12.5m

What is the recoil velocity on Billy Bob Joe’s 5kg rifle that shoots out a .02kg bullet at a speed of 620m/s?

Answer: -2.48m/s

Bob Renthrou swings a hammer (4.2kg) down 1.3 meters onto the head of a Smurf. The Smurf is compressed .57m.

What is the KE and PE of the hammer? Answer: 53.51J and 53.51J

What is the force on the Smurf’s head? Answer: 93.87N