Final Exam Review, part 2
Friday, December 12
6:15
• A 1500kg car drives around a flat 200-mdiameter circular track at 25m/s. What are
the magnitude and direction of the net force
on the car? What causes this force?
6:24
• The centers of a 10kg lead ball and a 100g
lead ball are separated by 10cm. What
gravitational force does each exert on the
other?
7:10
• What magnitude of F2 causes the net torque
on the rod to be zero?
F2
F1=20.0N
450
.5m
1m
9:48
• A 20 g ball of clay is thrown horizontally at 30
m/s towards a 1.0 kg block and sticks to the
block. The block is on a magic frictionless
surface. What is the speed of the block and
clay immediately after the clay hits?
7:48
• Before
after
• V1i =20m/s
v2i = 0 vf we want to find
• pi=Mball*v1i+0=pf=(Mball + Mblock)vf
vf 
M ball
 M ball
.2 kg
 .2  1.  kg
 M block
20
m
s

vi 
 3.33
m
s
oscillators
• A massless spring has a spring constant of
10.0N/m. It is hung vertically. Then a 250 g
mass is hung from the spring. How far does it
stretch?
• B) If the mass is made to oscillate vertically,
what is its period?
Mass on a spring
• k=10N/m, F =mg =k Δy
• Δy = mg/k = .250*9.8/10. = 0.245 m 24.5cm
k
 
m
f 

2

1
k
2
m
f  1 .0 0 5 s

1
1 0 .0 N / m
2
.2 5 0 kg

Final Exam
• Monday, December 15, 1:30-3:30pm HERE