Posted by **Corey** on Monday, April 8, 2013 at 10:30pm.

A student, crazed by the first physics Midterm, uses a pushing force of

80 N angled at 70° to push a 5.0 kg book across the frictionless ceiling

of his room.

a. What is the block's acceleration?

b. What is the force of the ceiling on the book?

- physics -
**drwls**, Tuesday, April 9, 2013 at 2:33am
Is the force applied at 70 degrees to the ceiling or the surface normal?

I assume it is 70 degrees to the ceiling, otherwise the brick would fall. The normal force on the ceiling is then 80sin70-5g = 26.1 N

(That is the answer to part (b))

The component along the ceiling is then

80 cos70 = 27.4 N

Acceleration = 27.4 N/(mass)= 5.47 m/s^2

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