1.) And object that is thrown vertically upward will return to its original position with the same speed as it had initially if air resistance is neglible. If air resistance is appreciable, will this result be altered, and if so, how?
2.) A foul ball is hit straight up into the air with a speed of about 25m/s. (a) how high does it go? (b) How long is it in the air?
3.) A kangaroo jumps to a vertical height of 2.7m. How long was it in the air before returning to earth?
4.) A ballplayer catches a ball 3.3s after throwing it vertically upward. With what speed idid he throw it, and what height did it reach?
5.) The best rebounders in basketball have a vertical leap (that is, the vertical movement of a fixed point on their body) of about 120cm. (a) What is their initial "launch" speed off the ground? (b) How long are they in the air?
6.) A stone is thrown vertivally upward with a speed of 20.0m/s.(a) How fast and how long is it moving when it reaches a height of 12.0m?
Thx guys.
2006-09-28 17:59:01 · 4 answers · asked by Anonymous in Education & Reference ➔ Homework Help
Neglect air resistance for all but number 1. Also grabity is 9.80m/s^2.
Thanks for any help. I know these are kinda hard and theres not too much info, but thats all the info i have.
2006-09-28 18:27:58 · update #1
#1 is false it comes down faster and may turn a different direction depending on wind and throwing speed and accuracy
2006-09-28 18:07:48 · answer #1 · answered by . 2 · 0⤊ 0⤋
1. Air friction can only slow things down.
2 Use v = v0-at. When it reaches peak v=0; a=9.8m/sec^2. Find t. The distance it travels is s = v0*t - .5*a*t^2. Use the t you just found to get s
3. The same as 2), except you have the going up time plus the going down time, which are the same
You should have enought now to solve the rest.
2006-09-28 19:48:03 · answer #2 · answered by gp4rts 7 · 0⤊ 0⤋
Look in your physics book for similar problems.
These questions are just a matter of finding the right equation and putting in the velocity or weight.
You really should have known.
2006-09-28 18:56:18 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The guidelines of physics are not commonly numbered, possibly your deliberating the three guidelines of thermodynamics which the 2d regulation is that each little thing ends up in additional beneficial entropy (chaos).
2016-11-25 01:52:01 · answer #4 · answered by roever 3 · 0⤊ 0⤋