Bat hits baseball

  • #1
16
0
<< Moderator Note -- thread moved to the HH forums >>

a pitcher throws a 1.5kg baseball with speed 25m/s. it hits the bat and return in opposite direction with same speed. the force that bat exerted on ball is 50N. For how long was the bat touching(in contact) the ball? I used: delat t * F = m*delta velocity delta t 50N = 1.5(25-(-25)) and i got t=1.5 s. Is it correct? It does not seem like.
 
Last edited by a moderator:

Answers and Replies

  • #2
21,380
4,800
a pitcher throws a 1.5kg baseball with speed 25m/s. it hits the bat and return in opposite direction with same speed. the force that bat exerted on ball is 50N. For how long was the bat touching(in contact) the ball? I used: delat t * F = m*delta velocity delta t 50N = 1.5(25-(-25)) and i got t=1.5 s. Is it correct? It does not seem like.
That's a pretty happy baseball. Are you sure of that 1.5 kg?

Chet
 
  • #3
16
0
That's a pretty happy baseball. Are you sure of that 1.5 kg?

Chet
yes
 
  • #4
21,380
4,800
yes
A major league baseball has a mass of 5.25 oz (0.15 kg). That 1.5 kg is an obvious typo.

And, please, don't try to play baseball with a 1.5 kg baseball. If you got hit by a fastball, it would be "lights out."

Chet
 
  • #5
16
0
o
A major league baseball has a mass of 5.25 oz (0.15 kg). That 1.5 kg is an obvious typo.

And, please, don't try to play baseball with a 1.5 kg baseball. If you got hit by a fastball, it would be "lights out."

Chet
ok, but under the conditions described what would be time?
 
  • #6
21,380
4,800
o

ok, but under the conditions described what would be time?
If you are asking whether you solved the problem correctly, given the obviously faulty data, then the answer is yes.

Chet
 
  • #7
force is the rate of change of momentum.
Thus, you have been given the change in momentum, the force excerted.
So,
t=Change in momentum/force
=2*1.5*25/50=75/50=1.5

Yup, your answer is correct
 
  • #8
sophiecentaur
Science Advisor
Gold Member
2020 Award
26,422
5,506
This is the sort of question you have to answer on impulse. Boom boom.
 

Related Threads on Bat hits baseball

  • Last Post
Replies
4
Views
8K
  • Last Post
Replies
8
Views
16K
  • Last Post
2
Replies
39
Views
716
Replies
14
Views
2K
  • Last Post
Replies
13
Views
1K
  • Last Post
Replies
5
Views
4K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
4
Views
827
Replies
4
Views
7K
  • Last Post
Replies
2
Views
4K
Top