Which of the following work practices help to ensure that a scissor lift does not tip over? 

When a person spins and stops suddenly, dizziness results because:

________________ keep tools, materials, and equipment from striking workers below. 29 CFR 1926 Part 451(h)(2) through 451(h)(2)(v)

Supported scaffolds with a height greater than four times the base width must be ________________. 29 CFR 1926 Part 451(c)(1)

A uniform beam of length 1.0 m with mass 91 kg is attached to a wall by a cable, as shown in the figure. The cable is attached at a 30 degree angle with respect to the beam. The beam is free to pivot at the point where it attaches to the wall. What is the tension in the cable? Show your work or explain your reasoning.

Two large lead spheres are sitting in a lab. Their masses are 56 kg and 39 kg. If the gravitational force between them is 9.4 x 10-8 N, what is the distance between the centers of these two large lead spheres? Show your work or explain your reasoning.

A nut needs to be tightened with a wrench.   Which force shown will apply the greatest torque to the nut? Which force shown will apply zero torque to the nut? Give a brief explanation of your reasoning for each part.

A 1750 kg car drives around a flat 380 m diameter circular track at 24 m/s. Draw a “side view” force diagram for this situation. Be sure to label all forces correctly. Clearly draw your diagram with forces labeled on your paper.  What is the magnitude of the net force on the car? Show your work or explain your reasoning.

A 275 g book is initially pushed to the right across a table with a speed of 1.3 m/s. Friction exerts a 0.37 N force on the book, slowing it down. Draw a force diagram for this situation with forces labeled. In the next questions, you’ll be asked to solve for the book’s acceleration and how far it will travel.  In this situation, the net force points toward the . On your paper, draw a force diagram of the book as it is sliding across the table and label all forces appropriately.   

The counselor reminds Jordan that moderate stress can enhance alertness. This statement reflects the concept of