× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
e
5
R
5
e
4
4
d
4
o
3
p
3
t
3
3
m
3
p
3
m
3
Home Q & A Board Science-Related Homework Help Physics
New Topic  
jingle_morgan jingle_morgan
wrote...
Posts: 2
Rep: 0 0
9 years ago
Estimate the force on a 145-gram baseball if it hits the bat at 50 miles per hour and stays in contact with the bat for 0.1 second, during which time it reverses direction and leaves the bat at 75 miles per hour. Express the result in newtons and in pounds.

I;m not sure how i'm suppose to go about this problem. Anything would really help, Thanks  lol
Read 254 times
1 Reply

Related Topics

Replies
wrote...
#1
Staff Member
9 years ago
Metric
======
60 miles / hour = 60 * [1 hour / 3600 sec] * [1.6 km/1 mile]*[1000 m / 1 km]
60 miles / hour = 26.67 m/s

By similar methods 75 mph = 33.33 m/s

145 grams = 145 / 1000 = 0.145 kg Why 1000

F = m*(v1 - v2)/ t I'll let you figure out why v2 is minus. Think about which way the ball is going.

F = 0.145 kg (26.67 - (- 33.33) ) / 0.1 second
F = 87 N

English
======
m = 0.145 kg * 2.2 = 0.319 pounds (mass)
60 mph = 88 feet per second.
75 mph = 75 * 5280 / 3600 = 110 feet / second
F = 0.319 * (88 - - 110)/0.1
F = 631
- Master of Science in Biology
- Bachelor of Science
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  980 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 151
  
 324
  
 119
Your Opinion
Which of the following is the best resource to supplement your studies:
Votes: 292
Previous poll results: What's your favorite math subject?