- #1

Edel Crine

- 89

- 12

- Homework Statement
- Starting from rest, an intern pushes a 45-kg gurney 40 m down the hall with a constant force of 80 N directed downward at an angle of 35° with respect to the horizontal.

(a) What is the work done by the intern on the gurney during the 15-m trip?

(b) How fast is the gurney going when it has moved 15 m?

(c) How much time elapses during the 15-m journey? Ignore friction.

- Relevant Equations
- W=F*x

I'm not sure that does the given distance represent "x" direction? If so, I did...

a) Fx = 80N * cos(35°) = 65.53N

W = F*Δx = 65.53N * (15m) = 982.98 J

b) k = 982.98 J = 1/2 (m)(v2)

v = (√2k/m) = 6.6 m/s

c) vf = vi + at

a = F/m = 1.46 m/s2

t = (vf-vi)/a = 4.54 sec

But I'm not sure for I got... h

a) Fx = 80N * cos(35°) = 65.53N

W = F*Δx = 65.53N * (15m) = 982.98 J

b) k = 982.98 J = 1/2 (m)(v2)

v = (√2k/m) = 6.6 m/s

c) vf = vi + at

a = F/m = 1.46 m/s2

t = (vf-vi)/a = 4.54 sec

But I'm not sure for I got... h