ug and K HW Check

4. The bob of a pendulum has a mass of 2.0 kg and hangs 0.50 m above the floor.  The bob is pulled sideways so that it is 0.75 m above the floor.  What is its potential energy with respect to its equilibrium position?

 

• 2.5 J

• 5 J

• 10 J

• 20 J

Tags

NGSS.MS-PS3-2

5.       A 2.00 x10³ kg object is pushed to the top of an incline as shown.  If the force applied along the incline is 6.00 x 10² N, what is the potential energy of the object when it is at the top of the incline with respect to the bottom?

• 100000 J

• 240000 J

• 120000 J

• 280000 J

6. 6.      A 3.0 kg psyduck is traveling at a constant speed of 7.5 m/s.  What is its kinetic energy?

• 169 J

• 23 J

• 7.5 J

• 84 J

Tags

NGSS.MS-PS3-1

9.     A 1200.0 N Bronco falls off a cliff on Earth.  What is its kinetic energy after it falls for 4.50 s?

• 121500 J

• 1200 J

• 5400 J

• 54000 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

10. 10.       An 8.0 kg piñata is dropped from a height of 7.0 m.  What is the kinetic energy of the piñata just before it hits the ground?

• 560 J

• 56 J

• 392 J

• 196 J

Tags

NGSS.MS-PS3-1

11.      A 9.00 kg object falls off of a 1.2 m high table.  If all of the objects potential energy is converted into kinetic energy just before it hits the floor, how fast is it moving?

• 108 m/s

• 6.5 m/s

• 120 m/s

• 4.9 m/s

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

12.       Solve #11 using kinematics this time. Is there any difference?

• yes

• no

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

Challenge Question: Mr. Mime is dropped from a height of 30 m, what is his velocity upon impact with the ground? Hint: Set Ug = K

• 300 m/s

• 24.5 m/s

• 30 m/s

• 14.5 m/s

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-5

NGSS.MS-PS2-2

NGSS.MS-PS2-4