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

## Answer This Question

## Related Questions

- Physics - A student, crazed by final exams, uses a force P of magnitude 80 N to ...
- Physics - A student, crazed by final exams, uses a force of magnitude 86 N and ...
- Physics - A student, crazed by final exams, uses a force of magnitude 86 N and ...
- physics - A 5.55 kg block covered in sandpaper is pushed along the ceiling of a ...
- physics - A 5.55 kg block covered in sandpaper is pushed along the ceiling of a ...
- physics - wet means lubrication. One of those is not wet. There is no difference...
- physics - A,horizontial,force,of,40N,actingon,a,block,of,frictionless,level,...
- physics - An unknown force pushes a 17 kilogram block across a smooth (...
- physics - An unknown force pushes a 17 kilogram block across a smooth (...
- Physics. - A block of mass 3m is placed on a frictionless horizontal surface, ...

More Related Questions