PHYS 220 PAST EXAM QUESTIONS EXAM QUESTIONS WITH CORRECT ANSWERS

PHYS 220 PAST EXAM QUESTIONS
EXAM QUESTIONS WITH CORRECT
ANSWERS
A |tennis |ball |with |a |mass |of |0.10 |kg |is |initially |at |rest |when |struck |by |a |tennis |racket. |The |racket |and |
ball |are |in |contact |for |0.05 |ms. |After |the |impact, |the |ball |moves |with |a |final |speed |of |15.0 |m/s.



Part |A:

What |was |the |magnitude |of |impulse |imparted |to |the |ball |by |the |racket |during |the |impact? |- |VERIFIED
|ANSWER✔✔-1.50 |N*s




Part |B:

Which |of |the |following |is |correct? |- |VERIFIED |ANSWER✔✔-Half |the |force |applied |for |0.10ms |would |
cause |the |ball |to |move |with |the |same |final |speed.



A |0.6 |kg |block |is |attached |to |a |spring |with |stiffness |75 |N/m. |The |block |is |moved, |which |compresses |
the |spring. |The |block |is |released |from |rest |and |undergoes |simple |harmonic |motion |on |a |smooth |
surface.



Part |A:

What |is |the |period |of |motion |for |the |block? |- |VERIFIED |ANSWER✔✔-0.56 |s



Part |B:

Which |of |the |following |is |correct |if |the |block's |mass |was |doubled |and |nothing |else |changed |about |
the |situation |above? |- |VERIFIED |ANSWER✔✔-The |frequency |of |motion |would |decrease.



A |skydiver |jumps |from |a |plane |that |is |flying |high |above |the |ground. |Assume |that |the |skydiver's |
vertical |speed |is |zero |immediately |after |leaving |the |plane.

Part |A:

Which |of |the |following |is |correct? |- |VERIFIED |ANSWER✔✔-The |force |due |to |gravity |does |positive |
work |on |the |skydiver.

, Part |B:

How |fast |is |the |skydiver |moving |after |falling |a |distance |of |100m? |- |VERIFIED |ANSWER✔✔-44 |m/s



Two |carts |travel |toward |each |other |along |a |track. |Cart |1 |has |mass |3kg |and |Cart |2 |has |mass |1.5kg. |
The |carts |collide, |stick |together, |and |stop |moving.

Part |A:

Which |of |the |following |is |correct |about |this |collision? |- |VERIFIED |ANSWER✔✔-Total |momentum |of |
the |two-cart |system |is |conserved.



Before |the |collision, |cart |1 |was |moving |at |2 |m/s. |How |fast |was |cart |2 |moving? |- |VERIFIED |
ANSWER✔✔-4 |m/s



Relative |to |the |hinge. |which |of |the |following |is |correct? |- |VERIFIED |ANSWER✔✔-The |cable's |force |
creates |a |torque |that |attempts |to |rotate |the |beam |counterclockwise.



Relative |to |the |hinge, |what |is |the |magnitude |of |torque |due |to |the |cable's |force |on |the |beam? |- |
VERIFIED |ANSWER✔✔-16.50 |N*m



Part |A:

Which |of |the |following |is |correct |while |the |song |was |playing? |- |VERIFIED |ANSWER✔✔-Points |near |the
|edge |of |the |CD |have |a |greater |tangential |speed |than |points |near |the |center.




While |the |song |was |playing, |a |point |on |the |disk |completed |4 |revolutions |every |second. |What |is |the |
CD's |angular |acceleration |rate |after |the |CD |player |was |turned |off |if |the |CD |takes |45 |seconds |to |stop?
|- |VERIFIED |ANSWER✔✔-0.558 |rad/s2




The |same |constant |force |is |applied |to |the |edge |of |both |objects, |causing |them |to |stop |turning. |Which |
of |the |following |is |correct? |- |VERIFIED |ANSWER✔✔-The |disk |will |stop |spinning |in |less |time |than |the |
hoop.