A System of Blocks and a Frictionless Pulley Is Shown

question 76

Multiple Choice

A system of blocks and a frictionless pulley is shown in the figure. Block A has a mass of 2.0 kg and is on a rough horizontal surface for which μ_s = 0.40 between the surface and block A. The rope pulls horizontally on block A. Block C has a mass of 1.0 kg. An external force P = 23.0 N, applied vertically to block A, maintains the system at rest as shown in the figure. What is the friction force on block A?

• A) 6.3 N
• B) 6.9 N
• C) 7.5 N
• D) 5.7 N
• E) 5.1 N

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Definitions:

Laser Resurfacing

A dermatological procedure that uses a laser to remove skin layers with precision, aiming to improve skin appearance or treat minor facial flaws by promoting new skin growth.

Dermis

The layer of skin beneath the epidermis that contains blood vessels, nerve endings, sweat glands, and hair follicles.

Ulcer

An open lesion on the skin or mucous membrane of the body characterized by loss of tissue and the formation of a secretion.

Epidermis

The outermost layer of cells in the skin, acting as the body's primary barrier against environmental damage.