Circular and projectile motion

  • Thread starter Cantworkit
  • Start date
  • #1
Cantworkit
12
0
[SOLVED] circular and projectile motion

Homework Statement


In the Olympic hammer throw, contestants whirl a 7.3 kg ball on the end of a 1.2 m long wire before releasing it. Suppose the hammer is released frim a height of 1.3 m while moving in a direction 24 degrees above the horizontal. If it travels 84 m horizontally, what is its radial acceleration just before release.
The book answer is a = 892 m/s^2


Homework Equations


y = x tan theta - gx^2/2v0^2 cos^2 theta

a = v^2/r

The Attempt at a Solution



1.3 = 84 (.445) - 9.8 (84)^2/2v0^2 (.914)^2

v0^2 = 41386.8/36.1 = 1146.4

a = 1146.4/1.2 = 955 m/s^2

Even if I just use the velocity in the x direction, it does not work.
 

Answers and Replies

  • #2
kamerling
454
0
The starting height is 1.3 m. The height when x=84 is 0 m
 

Suggested for: Circular and projectile motion

  • Last Post
Replies
18
Views
425
  • Last Post
Replies
6
Views
280
  • Last Post
Replies
6
Views
299
Replies
7
Views
355
Replies
3
Views
91
  • Last Post
Replies
4
Views
388
Replies
2
Views
175
  • Last Post
Replies
20
Views
633
Replies
6
Views
364
Replies
7
Views
75
Top