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alli66

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[Note from mentor: This was originally posted in a non-homework forum, therefore it does not use the homework template.]

we did a lab on catapult but I'm having trouble figuring out the math? i calculated the hangtime, but all i did was take the original time and divide it by 2, is that right?

QUESTIONS:

we did a lab on catapult but I'm having trouble figuring out the math? i calculated the hangtime, but all i did was take the original time and divide it by 2, is that right?

QUESTIONS:

**1) how long did it take to reach peak height?**

2) what is the projectiles initial vel in the x and y direction?

3) what was the initial vel.?

4) what was the peak height?

5) how much PE did the ball have at the peak height?use h from #4

6) what's the KE of the ball at the launch? use vi from #3

7) how fast is the ball moving at the peak height?use conservation of energy

8 )what was the elastic P.E of the catapult?

9) what was the spring constant?

10) how much work was done by gravity on the ball?2) what is the projectiles initial vel in the x and y direction?

3) what was the initial vel.?

4) what was the peak height?

5) how much PE did the ball have at the peak height?use h from #4

6) what's the KE of the ball at the launch? use vi from #3

7) how fast is the ball moving at the peak height?use conservation of energy

8 )what was the elastic P.E of the catapult?

9) what was the spring constant?

10) how much work was done by gravity on the ball?

*DATA:*

- catapult launch angle 70 degrees

- length of armature = 28cm

- elastic band length before= .875in

- elastic band length after= 2.75 in

- mass of ball= 18.75 g

launch distance: trial 1: 12.85m, trial 2: 3.09m, trial 3: 3.15m, avg of the 3= 3.03 m

hang time: original time divided by 2 to get hang time? that's what i did but i think its wrong: trial 1: 1.60s/2 =.8 sec, trial 2: 1.65 sec/2= .825, trial 3: 1.71/2=.855s,, avg of 3 hangtimes= .8266secs- catapult launch angle 70 degrees

- length of armature = 28cm

- elastic band length before= .875in

- elastic band length after= 2.75 in

- mass of ball= 18.75 g

launch distance: trial 1: 12.85m, trial 2: 3.09m, trial 3: 3.15m, avg of the 3= 3.03 m

hang time: original time divided by 2 to get hang time? that's what i did but i think its wrong: trial 1: 1.60s/2 =.8 sec, trial 2: 1.65 sec/2= .825, trial 3: 1.71/2=.855s,, avg of 3 hangtimes= .8266secs

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