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Transcript
Problems from Exam#1 Complete the following table with the appropriate units. Measurement Length mass temperature time SI Units 11. 12. 13. 14. Convert the following units and show your work to get the full credit. 15. 3,000m=_______km 16. 200 mg=________cg 17. 200 dm2=_______m2 18. 3,000 cm3=______m3 19. 40 0C =________K 20. _______ h=120min +20min=_________s Mary and Paul are going to watch a movie at the movie theatre. They need 20 minutes to get to the theatre and the movie lasts 120 minutes. How much time in seconds do they need to spend from the moment that they leave their house until the moment that the movie ends? Show your work. Problems from Exam#2 1) A science book is moved once around the perimeter of a table with the dimensions 1m by 3 m. If the books ends up at its original position, a. What is its distance traveled? b. What is its displacement? 2) A person walking covers 8m in 4 s. How fast is the person moving? (π ππππ = πππ π‘ππππ π‘πππ ) 3) A cyclist leaves home and rides due east for a distance of 40 km. She returns home on the same bike path. If the entire trip takes 4 h. a. What is her average speed? (π ππππ = πππ π‘ππππ π‘πππ ) b. What is her displacement? 4) A car travels west for 200km in 10h. What is the carβs velocity? (π£ππππππ‘π¦ = πππ π‘ππππ π‘πππ 5) A car goes from 16m/s to 2m/s in 7s. What is the carβs acceleration? ( πππππππππ‘πππ = ) ππππππβπ ππππ‘πππ π‘πππ ) 6) A satellite's speed is 1,000 m/s. After 100 s it is 500m/s. What is the satelliteβs acceleration? ( πππππππππ‘πππ = ππππππβπ ππππ‘πππ π‘πππ ) 7) An object goes from a speed of 9m/s to a total stop in 3s. What is the objectβs acceleration? Problems from Exam #3 Complete the table below by calculating the missing values. [1 point] Object A B C D Mass 10 kg Velocity 25 m/s 25 m/s 25 kg 25 m/s 3. Use the information in the table above to answer the following questions. [1.6 points] a. Which object has greatest momentum? b. Which object has the least momentum? c. How does the momentum of object B compare with the momentum of object C? Momentum 300 kg m/s 300 kg m/s 500 kg m/s d. Why is the momentum for object B greater than the momentum for object A? 4. Do the following calculations. Show your work in the spaces provided. A. If the mass of a helicopter is 5,000 kg and the net force on it is 10,000 N, what is the helicopter's acceleration? B. What is the net force of an object with mass 500 kg, if its acceleration is 5 m/s2? C. What is the gravitational force on a sky diver when his mass is 100 kg? Problems from Exam#4 A. A roller coaster car has mass 500 kg and it is moving with a speed of 3m/s at the top of hill that is 30m high? known 1. Calculate the cartβs Kinetic energy. 2. Calculate the cartβs potential energy. unknown 3. Calculate the cartβs mechanical energy. B. Calculate the height of the sack when its mass is 100 kg and its gravitational potential energy is 980J. known unknown C. Calculate the mass of a cart with kinetic energy 1000 J and speed 10 m/s. known unknown D. Read the problem below and answer the questions 1 and 2. A carpenter lifts a 10kg piece of wood to his shoulder 1.5 m above the ground. He then sets the wood on his truck at 1 m above the ground and makes his delivery going 10 m/s. known unknown 1. a. What is the woodβs potential energy on the carpenterβs shoulder? a. On the truck? 2. What is the woodsβ kinetic energy during the delivery? A system has a total mechanical energy of 350J and kinetic energy of 220 J. What is its potential energy? Problems from Exam#5 1. How much work is done on a 75 N bowling ball when you carry it horizontally across a 10m wide room? 2. How much work is done when a force of 1N moves a book 2m? 3. How much work is done by a 40 W light bulb in 60 second? 4. By applying a force of 50 N, a pulley system can lift a box with mass of 20kg.What is the mechanical advantage of the pulley system? 5. What is the efficiency of a cyclist who expends 900J of work to his bike for it to produce 76 J of useful work?