(2013 Hunan Simulation) As shown in the figure, a block with mass m slides down along the inner wall of a hemispherical metal shell with radius R. The hemispherical metal shell is fixed vertically.

A. The size of the centripetal force Fn=mv2R. Therefore A is wrong.

B. According to Newton’s second law, N-mg=mv2R, then N=mg+mv2R. So the sliding friction force f=μN=μ(mg+mv2R). Therefore, B is wrong and C is correct.

D. Since the direction of the resultant force of the gravity support force is vertically upward and the direction of the sliding friction force is horizontally to the left, the direction of the resultant force of the object is obliquely upward to the left. Therefore D is correct.

So choose CD.

Dr. Ed died two months after he came back. How rare is it that our years are quiet?

Plastic surgery is cost-effective

Physical examination fees for recruitment by public institutions in Rongcheng City, Weihai in 2023

Are there risks with mandibular angle plastic surgery?

How about Xinxiang Huamei Education Printing Co., Ltd.?

River dredging construction plan design?

How to make spots fade

Zhang Yijie plastic surgery

Why do people in Henan call women sisters-in-law

Three characteristics of facial sculpture beauty