Physics

Problem

![](https://storage.googleapis.com/diraq-contents/question-bank/question-images/5a1f1f383e9d/2025_11_20_6c008e7ceab86f3b0891g-09.jpg) 43. A force

F

is used to hold a block of mass

m

on an incline as shown in the diagram (see above). The plane makes an angle of

\theta

with the horizontal and

F

is perpendicular to the plane. The coefficient of friction between the plane and the block is

\mu

. What is the minimum force,

F

, necessary to keep the block at rest? (A)

m g \cos \theta

(B)

m g \sin \theta

(C)

m g \sin \theta / \mu

(D)

\operatorname{mg}(\sin \theta-\mu \cos \theta) / \mu