Tennessee State University Dr. Orville N. Bignall PHYS2110 Exam Fall 2014 Name p

Question

Tennessee State University Dr. Orville N. Bignall PHYS2110 Exam Fall 2014 Name points: 1 1) Which one of the following stresses would be most likely to cause a bone to fracture? A) tensile stress B) sheer stress C) bulk stress. D) compressive stress Points: 1 2) Tensile stress is A) the strain per unit length. B) the applied force per cross-sectional area c) the ratio of the change in length to the original length. D) he same as force. the ratio of elastic modulus to strain Points: 3 3) A wrench is acting on a nut trying to turn it. The length of the wrench lies directly to the east of the nut. A force 150.0 N acts on the wrench at a position 15.0 cm from the center of the nut in a direction 30.0° north of east. What is the magnitude of the torque about the center of the nut? A) 11.3 N. m B) 19.5 N C) 2250 N D) 1949 N.m E) 22.5 N.m Points: 1. 4) A small car has a head-on collision with a large truck, Which of the following statements concerning the magnitude of the average force due to the collision is correct? A) The small car and the truck experience the same average force. C) The small car experiences the greater average force. D) It is impossible to tell since the masses are not given E) It is impossible to tell since the velocities are not given.

Explanation / Answer

1. (B) this is the only which act perpendicular to cross section.

2 .(B) this is formula

3. (A) torque= F*L*Sin(theta)

so, Torque= 150*.15*sin(30)= 11.3 N-m

4. (A) force= impules/time

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