All the F (force on a body) vs. t graphs below
enclose the same area. For which situation will the
body’s change in momentum (p) be maximum?
All the F (force on a body) vs. t graphs below
enclose the same area. Which situation is best for
the safety of a person if F is exerted on him/her?
F
F
F
t
Graph 1
A.
B.
C.
D.
F
t
Graph 2
F
t
Graph 3
t
Graph 1
Graph 1
All have same
change in p
Graph 2
Graph 3
A.
B.
C.
D.
6-20. A pitcher throws a 0.15-kg baseball so that it
crosses home plate horizontally with a speed of 20 m/s.
The ball is hit straight back at the pitcher with a final
speed of 22 m/s. (a) What is the impulse delivered to the
ball? (b) Find the average force exerted by the bat on the
ball if the two are in contact for 2.0 × 10–3 s.
20 m/s
batter
positive
A.
pitcher
batter
negative
Find the average force exerted by the bat
on the ball if the two are in contact for
2.0 × 10–3 s.
A.
B.
C.
D.
3.1 × 103 N
towards pitcher
3.1 × 103 N
towards batter
6.3 N towards
batter
6.3 N towards
pitcher
C.
D.
22 m/s
t
Graph 2
t
Graph 3
Graph 1
Graph 2
Since change in p is
same all are equally
safe/unsafe
Graph 3
A pitcher throws a 0.15-kg baseball so that it crosses
home plate horizontally with a speed of 20 m/s. The ball
is hit straight back at the pitcher with a final speed of
22 m/s. What is the impulse delivered to the ball?
B.
pitcher
F
0.30 kg m/s
towards pitcher
0.30 kg m/s
toward batter
6.3 kg m/s
toward pitcher
6.3 kg m/s
toward batter