Download Practice Problems Semester 1 Exam 1. Express the measurements

Practice Problems Semester 1 Exam
1. Express the measurements in scientific notation
A. 0.0579 g
B. 590000000 m
C. 0.000327 g
D. 650100000 cm
2. Convert each measurement to its proper measurement
A. 1.23km to m
B. 5.01g to kg
C. 3.26 hours to s
D. 8.90cm to m
3. Solve the following problems. Express your answer in scientific notation only.
A. 2.5 x 10-2 m + 2.7 x 10-3 m
B. 3.1 x 10-3 km - 4.8 m
C. (4.8 x 109 cm) (3.53 x 10-4 cm)
D. (7.69 x 10-1 m) / (1.28 x 10 -2 s)
4. State the number of significant digits in the following measurements.
A. 4318 kg
B. 60.056 kg
C. 907 g
D. 0.000435 m
E. 400 s
F. 6000.0 cm
5. Multiply or divide as indicated using significant digits correctly.
A. (9 x 105 m)(3.27 x 107 m)
B. (1.48 x 10-2 km)(3.5 x 10-5 km)
C. (2.76 x 104 kg) / (8.42 x 103 m)
D. (6.21 x 10-1 m) / (3.52 x 102 s)
6. Add or subtract as indicated and state the answer with the correct number of significant figures.
A. 0.0065g + 6.19 mg
B. 8.67 km + 0.5309 km
C. 352 N - 15 N
D. 73.28 s - 47 s
7. Scooby and pals van can be slowed with a constant acceleration of -13.0 m/s2. If the van is going
88.55 km/hr, how many meters will it take to stop? (Convert first)
8. Chris is on the Amtrak. The train is traveling at the speed of 15.5 m/s at the top of a hill. 5.00s later it
reaches the bottom of the hill and is moving at 30.0 m/s.
A. What is the rate of acceleration of the Amtrak?
B. How long was the hill?
9. A car accelerates at a constant rate from 22.0 m/s to 40.0 m/s while it travels 150.0 m. How long
does it take to reach the final speed?
10. An astronaut drops a moon rock from 3.5 m above the surface of the moon. If the acceleration of
gravity on the moon is 1.62 m/s2 downward, how long does it take the rock to hit the moon’s surface?
11. A car accelerates at a constant rate from 22.0 m/s to 40.0 m/s while it travels 150.0 m. How long
does it take to reach the final speed?
12. Rob drops a penny off the Empire State Building. If it falls freely for 10.0 s, what is the stones
velocity? displacement?
13. The directions used to locate a party tell you to drive 3.2 miles west from the parking lot in front of
the school, turn 65o right and drive 4.8 more miles. What is the magnitude and direction of the party’s
displacement from the door of the school?
14. A boat is traveling directly west across a stream at a velocity of 4.5m/s. The current of the river is
flowing 9.8 m/s north. What is the magnitude and direction of the boat?
15. Find the components of the velocity of a car that is moving at 34.0 km/hr in a direction of 29.0 o
north of east.
16. A ball is thrown horizontally from the top of a building 125 m high. The ball strikes the ground at a
point 45.0 m horizontally from the base of the building. What is the speed of the ball just before it
strikes the ground?
17. A soccer ball is kicked into the air at an angle of 28.0 degrees above the horizontal with an initial
velocity of 17.0 m/s. Ignoring air resistance:
A. What is the maximum height of the soccer ball?
B. How long was the ball in the air?
C. What is the horizontal distance the ball travelled?
18. A ball flies off a building with a horizontal velocity of 68.0 m/s, when it begins to fall. What is the
horizontal displacement if the building was 150 m high?
19. Jason's 1055 kg car has a μ of 0.195 when it is rolling. The car starts at rest and the engine applies
2970N of force.
a. What is the force of friction?
b. What is the net force?
c. What is the acceleration of the car?
d. How much time will it take the car to reach a speed of 65 km/hr?
20. The coefficient of kinetic friction between a 58 kg box and a warehouse floor is 0.21. How much
force is needed to keep the box moving at a constant velocity.
2 1. Mark is moving off to college. He is loading his furniture into a truck using a truck ramp that is
angled at 38.0o with the horizontal. If the mass of the load that is being pulled up the truck is 285.0 kg,
the coefficient of kinetic friction is 0.35, and it is being pulled with a force of 2500.0 N, what is the net
force?
22. Carson is pulling a sled with his baby sister in it. He applies a 585 N force to the sled and baby sister
(19.5 kg) at a direction of 27.0° above the horizontal to move the sled at a constant speed.
A. What is the normal force?
B. What is the frictional force?
C. What is the coefficient of friction?
23. An object whose mass is 15.0 kg is pushed with a horizontal force of 20.0 N so that the object moves
at a constant velocity.
A. Draw the free body diagram, identifying the forces.
B. Determine the size of all the forces and label them on the drawing.
C. Determine the net force on the object.
D. Determine the acceleration of the object.
24. A 1150 kg car is applying a 2,500 N force to accelerate it forward. The force of friction the wheels
apply to the road is 500. N.
A. Draw the free body diagram, identifying the forces.
B. Determine the size of all the forces and label them on the drawing.
C. Determine the net force on the object.
D. Determine the acceleration of the object
25. A 40.0 kg box sliding at 4.00 m/s on a rough surface is brought to rest by 25.0 N of friction. What
distance does the box slide?