Download Problems from Exam#1 Complete the following table with the

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? (𝑠𝑝𝑒𝑒𝑑 =
𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒
𝑡𝑖𝑚𝑒
)
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? (𝑠𝑝𝑒𝑒𝑑 =
𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒
𝑡𝑖𝑚𝑒
)
b. What is her displacement?
4) A car travels west for 200km in 10h. What is the car’s velocity? (𝑣𝑒𝑙𝑜𝑐𝑖𝑡𝑦 =
𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒
𝑡𝑖𝑚𝑒
5) A car goes from 16m/s to 2m/s in 7s. What is the car’s acceleration? ( 𝑎𝑐𝑐𝑒𝑙𝑒𝑟𝑎𝑡𝑖𝑜𝑛 =
)
𝑉𝑓𝑖𝑛𝑎𝑙−𝑉 𝑖𝑛𝑖𝑡𝑖𝑎𝑙
𝑡𝑖𝑚𝑒
)
6) A satellite's speed is 1,000 m/s. After 100 s it is 500m/s. What is the satellite’s acceleration?
( 𝑎𝑐𝑐𝑒𝑙𝑒𝑟𝑎𝑡𝑖𝑜𝑛 =
𝑉𝑓𝑖𝑛𝑎𝑙−𝑉 𝑖𝑛𝑖𝑡𝑖𝑎𝑙
𝑡𝑖𝑚𝑒
)
7) An object goes from a speed of 9m/s to a total stop in 3s. What is the object’s 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 cart’s Kinetic energy.
2. Calculate the cart’s potential energy.
unknown
3. Calculate the cart’s 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 wood’s potential energy on the carpenter’s shoulder?
a. On the truck?
2. What is the woods’ 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?