Physics Final!!!

fill in the blanks

Fnorm=48.4 Ffrict=24.2N Fgrav=78.4N a=24.8 Fnet=27.8

18. Analyze the free body diagram and determine which of the following statements are true of this rightward - moving object . ( Use the approximate value of g = 10 m / s / s . ) a . This object weighs 100 N. b . The magnitude of the acceleration is 2 m / s / s . c . The object has a mass of 1000 kg . d . The acceleration is rightward . e . The object is gaining speed . f . The acceleration is leftward .

a, b, f

2. An object rests upon an inclined plane . If the angle of incline is increased , then the normal force would . a . increase b . decrease c . remain the same

b

Consider the force shown in the diagram. This force factor would have components that are directed__ and __

east...south

9. A golf pro places a ball at rest on the tee , lines up his shot , draws back his club , and lets one rip . During the contact of the golf club with the golf ball , the force of the club on the ball is the force of the ball on the club and the acceleration of the club is than the acceleration of the ball . a . greater than , greater than b . greater than , equal to c . greater than , less than d . less than , less than e . less than , equal to f . less than , greater than g . equal to , equal to h . equal to , greater than i . equal to , less than

i

A vector shown in the diagram below. This vector has two components. The__ component will be greater than the__

westward...northward

Suppose that a force with a magnitude of 52.8 N is exerted at an angle of 18° with the horizontal. What are the X and why components of this for us? Draw diagram showing angle and then show your work to solve the problem

y=16.3 x=50.2

Suppose that a force of the magnitude of 42.6 and is exerted on an angle of 36° with the horizontal. What are the X and Y components of this force? Draw a diagram showing the angle and then show your work to solve the problem

y=25.0 x=34.5

14. The cable of a freight elevator applies a 1800N force to accelerate a 150kg elevator upward 17. Determine the acceleration ( in m / s / s ) of a 7.0 - kg object that experiences a net force of 36.0 N

-2.2m/s2

A 72kg skydiver is falling from 10,000 feet . After reaching terminal velocity , the skydiver opens resistance force of 1180 his parachute . Shortly thereafter , there is an instant in time in which the skydiver encounters an air Newtons . Determine the acceleration of the skydiver at this instant .

-6.59m/s2

What is the rate of acceleration for the Data Set D ? At what time would the object be at 0 m / s ? How much distance is covered in the first 3 seconds ?

-8m/s2 4sec 60m

If a rocket in space is moving at a constant velocity of 9.8 m/s and then uses its propulsion system to accelerate to 10. m/s during a 3.0 minute burn , what would be the acceleration of the rocket ?

0.0011m/s2

A body with an initial velocity of 8 m / s moves with a constant acceleration and travels 640 m in 40 seconds . Find its acceleration .

0.4m/s2

16. A satellite orbits the Earth in a circular path with a radius of 400,000 m . It completes one full revolution around the Earth in 90 minutes . Calculate the centripetal acceleration experienced by the satellite

0.54m/s2

A car traveling at a speed of 25 m/s increases its speed to 30.0 m/s in 10.0 seconds . What is the magnitude of its acceleration?

0.5m/s2

A 500kg freight elevator is descending downward at a constant velocity of 0.50 m / s . Determine the net force and the acceleration of the object .

0N

21. A discus thrower spins a 2 - kg discus in a circle with a velocity of 12 m / s . What is the radius of the circle if the centripetal force is 150 N ?

1.92m

5. Big Bubba has a mass of 100 kg on the earth . What is Big Bubba's mass on the moon where the force of gravity is approximately 1 / 6 - th that of Earth's ? Explain or show your work .

100kg

Pete the Penguin loves to sled down his favorite hill . If he hits a speed of 50 m/s after 5 seconds , what is his rate of acceleration ? Think about what his initial velocity is at the top of the hill .

10m/s2

13. A horse on a carousel with a linear speed of 3.5 m / s . If the horse completes 3 revolutions in 1 minute , what is the radius of the carouse ?

11.1m

A race car travels at a speed of 95 m/s . How far does it travel in 12.5 s ? Use the appropriate mathematical expression and show how units cancel

1187.5m

24. An astronaut weighs 500 N on the surface of Mars , which has a mass of 6.4 x 1023 kg . If the radius of Mars is approximately 3,390,000 meters , what is the astronaut's mass ?

134.6N

14. A dolphin swims around a coral . reef in a perfect circle at a speed of 3 m / s . If the dolphin is at a radius of 8 meters, how long will one circle take him?

16.7sec

A child drops a ball from a bridge . The ball strikes the water under the bridge 2.0 seconds later . What is the velocity of the ball when it strikes the water ?

19.6

A 72kg skydiver is falling from 10000 feet . At an instant during the fall , the skydiver encounters an air resistance force of 540 Newtons . Determine the acceleration of the skydiver at this instant.

2.3m/s2

18. An ice skater is spinning in a circular motion with a constant velocity of 3 meters per second . The skater experiences a centripetal acceleration of 3.6 m / s . Determine the radius of the skater's circular path .

2.5m

22. A cat chases a mouse around a circular path 4 times in 12 seconds with a radius of 1.7 meters . What is the cat's linear speed ?

2.5m/s2

15. A swam of locusts is flying in a circular pattern around a field . The swarm maintains a constant linear speed of 15 m / s , while flying in a circular path with a radius of 80 meters . What is the centripetal acceleration experienced by the locusts ?

2.8m/s2

17. A car's traveling along a circular track with a radius of 50 meters . The car experiences a centripetal acceleration of 10 m / s² . Calculate the speed at which the car is traveling .

22.4m/s

A boy throws a rock straight up into the air . It reaches the highest point of its flight after 2.5 seconds . How fast was the rock going when it left the boy's hand ?

24.5

20. A race car is moving along a circular track with a radius of 50 meters at 30 meters per second . If it experiences a centripetal force of 45,000 Newtons , what is the mass of the car ?

2500kg

19. A rollercoaster car is traveling at 20 m / s while completing a circular loop with a radius of 40 meters . If the car is 300 kg , what is the centripetal force it is experiencing ?

300N

An airplane travels down a runway for 4.0 seconds with an acceleration of 9.0 m/s² . What is the change in velocity during this time ?

36m/s

A 5.20N force is applied to a 1.05 - kg object to accelerate it rightwards across a friction - free surface . Determine the acceleration of the object .

4.95m/s2

An object falls from a skyscraper and hits the ground after 5 seconds . The acceleration of this object due to gravity was 9.8 m / s2 . What was the change in velocity of this object ?

49m/s

10. Toon Train is traveling at the speed of 10 m / s at the top of a hill . Five seconds later it reaches the bottom of the hill and is moving 30 m / s . What is the rate of acceleration for the Toon Train ?

4m/s2

17. Determine the acceleration ( in m / s / s ) of a 7.0 - kg object that experiences a net force of 36.0 N

5.1m/s2

Afterwords most recent delivery, the infamous stork announces the good news. If the sign has a massive 10.0 kg, then what is the tensional forces in each cable?

56.5N

A 2kg box is sliding to the right across a table . The force of friction upon the box is 5 N. Determine the net force and the acceleration of the object

5N -2.5m/s2

3. Three pictures of equal weight ( 20 N ) are hung on the wall by wires with three different orientations . In which orientation ( angle measure ) are the wires least likely to break ? Explain why .

60 degrees

25. Do you ever feel your cell phone pulling at you to check it ? How far apart should a 75 - kg student and their 0.03 - kg cell phone be placed on a desk to experience a gravitational attraction of 3 Newtons between them ?

7x10^-6

A 2kg box is free-falling from the table to the ground . Determine the net force and the acceleration of the object .

9,8m/s2

23. Determine the force of gravitational attraction between a cell phone satellite ( 1.5 x 10 kg ) and the Earth ( 5.97 x 1024 kg ) when they are 2.5 x 107 meters apart .

955.7N

Shown at right is a velocity vs time graph for an object . a Describe the motion of the object . b . Draw the corresponding position vs time graph . Number the x - axis . c . How far did the object travel in the interval t Is to t = 2s ? d . What is the total displacement ? Explain how you got the answer .

A. Moves at 4m/s, turns around and moves at -3m/s and then stops B. — C. 4m D. 5m

Consider the v vs t graph below a . Describe the behavior of the object depicted in the graph . b . Draw a motion map that represents the behavior of the object .

A. Moves at a constant speed of 3m/s, then turns around and moves at -1m/s back to the reference point B. —

fill in the blanks

Fair=624N Fgrav=784N

fill in the blanks

Fnorm=364 Ffrict=72.8N m=42.9 a=3.2 Fnet=137.2

15. Consider the physical situation shown below . A 43.1 - Newton force is applied at a 32 - degree angle to the horizontal to accelerate a 8.8 - kg box across a rough surface ( coefficient of friction = 0.35 ) . Use g = 9.8 m / s / s to fill in all the blanks and determine the acceleration of the box .

Fnorm=63.4 Ffrict=22.2 Fgrav=86.2 a=1.6

1. For an object resting upon a non - accelerating surface , the normal force is equal to the force of gravity . a . True b . False

a

4. Consider Newton's second law of motion to determine which of the following statements are true ? List all that apply . a . If an object is moving to the right and slowing down , then the net force on the object is directed towards the left . b . Accelerating objects are either slowing down or speeding up . c . The acceleration of an object is directly dependent upon its mass and Inversely dependent upon its net force . d . An object has an acceleration of 8 m / s / s . If the net force acting upon the object is increased by a factor of 2 , then the new acceleration would be 10 m / s / s . e . An object has an acceleration of 8 m / s / s . If the mass of the object is increased by a factor of 2 , then the new acceleration would be 16 m / s / s . f . A 2 - kg object accelerates from rest to a final velocity of 6 m / s in 3 seconds . The magnitude of the net force acting upon the object is 12 N.

a

1. Which of the following statements are true of inertia ? List all that apply . a . Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity . b . Inertia is a force which brings all objects to a rest position . c . All objects have inertia . d . A more massive object has more inertia than a less massive object . e . Fast - moving objects have more inertia than slow - moving objects . f . An object would not have any inertia in a gravity - free environment ( if there is such a place ) . g . Inertia is the tendency of all objects to resist motion and ultimately stop . h . In a gravity - free environment ( should there be one ) , a person with a lot of inertia would have the same ability to make a turn as a person with a small amount of inertia .

a, c, d

4. A 50 - N force is applied at an angle of 30 degrees north of east . This would be the same as applying two forces at a . 43 N , east and 7 N , north b . 35 N , east and 15 N , north c . 25 N , east and 25 N , north d . 43 N , east and 25 N north

d

3. Which of the following statements are true of the concept of force ? List all that apply . a . Bubba approaches Billie and gives him a swift shove . Timid little Billie keeps his hands in his pocket during this Interaction . Subsequently , while Bubba places a force upon Billle , Billie does not place a force upon Bubba . b . A quarterback throws a football down fleld . Once thrown , the force from the quarterback persists upon the ball to cause it to continue on its upward trajectory towards its peak . c . A sied slides down the hill and reaches the bottom where it gradually slows to a stop . Once on the level ground , the force of the hill persists upon the sled to allow it to continue its forward motion . d . Forces always cause objects to move . e . An object can experience two or more forces and not accelerate . f . A contact force results from the physical contact between two objects . g . A field forc

e, f, g

Consider the force vector shown in the diagram. This force vector would have components that are__ and __

east...north

14. A box of mass ' m ' is being dragged across a rough , level surface having a coefficient of friction of ' mu . ' A force is being applied to the box in an upward and a rightward direction ( as shown below ) . This force makes an angle of 30 degrees with the horizontal . The force of friction experienced by the box would be equal to a . the weight of the box b . applied force acting upon the block c . the coefficient of friction multiplied by the weight of the box d . the mass of the box multiplied by the acceleration of the box e . mum.g f . m . g / mu g . mu . Fapp sin ( 30 degrees )

g

2. Which of the following statements are true of an object that experiences balanced forces ( or unbalanced forces ) ? List all that apply . a. If a person is moving to the right , then the forces acting upon it are NOT balanced b . A balance of forces is demonstrated by an object which is slowing to a stop . c . It would take an unbalanced force to keep an object in motion . d . If an object is moving with a constant speed in a circle , then the forces acting upon the object are balanced . e . If an object is accelerating at a constant rate of acceleration , then the forces acting upon the object are balanced . f . It is NOT possible for just three forces to be acting upon an object and they still balance each other . g . A free - falling object experiences a balance of forces . h . Balanced forces cause stationary objects to remain at rest and moving objects to come to rest . i . Unbalanced forces cause ob

i

A car traveling at 10 m/s starts to decelerate steadily . It comes to a complete stop in 20 seconds . What is the acceleration?

-0.5

An 8N force is applied to a 2kg box to accelerate it to the right across a table. The box encounters a force of friction of 5 N. Determine the net force and the acceleration of the object .

1.5m/s2

22. Six Flags Magic Mountain's " Full Throttle " roller coaster has a circutar loop with a racius of 30 meters . A 65 - kg girl experiences a net force of 1200 N at the top of the loop . What is the girl's velocity ?

23.5m/s

16. What net force ( in Newton ) would cause a 30.0 - kg object to experience an acceleration of 2.0 m / s / s ?

60N

An object weighs 712.0 Newton . It is being pushed along a horizontal surface by a 440.0Newton force . Determine the mass of the object .

72.65kg

Johnny drives to Wisconsin ( 1920 miles ) in 32 hours . He returns home by the same route in the same amount of time a . Determine his average speed b . Determine his average velocity

A. 60 mi/hr B. 0mi/kr

Consider the position vs time graph at right . a . Determine the average velocity of the object . b . Write a mathematical equation to describe the 10 motion of the object .

A. 8.3m/s B. D=8.3t+10

What is accelerating? What is moving at a constant velocity ? What is stopped ? What do the slope of the lines mean ?

B C D D A C B None A E A V