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September 20, 2014

September 20, 2014

Posted by **Priscilla** on Sunday, February 19, 2012 at 9:53pm.

(a) How long does it take for the book to reach the elevator floor, 1.2 m below your arm?

(b) What is your book's speed relative to you when it hits the elevator floor?

2. To celebrate a victory, a pitcher throws her glove straight up-ward with an initial speed of 6.0m/s.

(a) How long does it take for the glove to return to the pitcher?

(b) How long does it take for the glove to reach its maximum height?

1a)

v = 3 m/s

h = 1.2 m

t = ?

Vf = ?

V = Vi + at

3 m/s = 0 + (9.8 m/s^2)(t)

t = .30 s

1b) Vf = Vi + at

Vf = 0 + (9.8m/s^2)(.30 s)

Vf = 2.94 m/s

2a & b)

Vi = 6 m/s

t1 = ?

t2 = ?

I'm really confused with this problem since only one quantity is given. But I dont think we can assume that final speed is 0 m/s.

- Physics -
**drwls**, Sunday, February 19, 2012 at 10:11pm1. The answer is the same as it would be in nonmoving elevator

(a) t = sqrt(2H/g) = 0.495 s

(b) V = sqrt(2gH) = 4.85 m/s

2. (a) 2 Vo/g

(b) Vo/g

Vo = 6 m/s

g = 9.8 m/s^2

- Physics -
**Priscilla**, Sunday, February 19, 2012 at 10:53pmThank you very much.

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