1.If an object is stationary (or moving with constant velocity) which statement best describes the situation. The sum of the forces acting on the object are zero. The sum of the moments acting on the object are zero. Both the sums of the forces and the moments acting on the object are zero. Both the sums of the forces and the moments acting on the object are constant.

Question 3 (25 points) Listen The 2225-N block shown in Figure is in contact with 25° incline. The coefficient of static friction is 0.4. Just start the block up the incline or a. Determine the force P for impending motion up the slope b. Determine the normal force between the block and the contact surface C. Assuming P=0, at What angle would the block have impending motion down the slope. Paragraph BI U ✓ A/ O + v

Question 4 (25 points) ➡ Listen The boom is supported by a cable and pin as shown. Neglect the size of the pulley at D. Find the reactions at C and the tension in the cable if W₁ = 35 kN and W₂ = 50 kN. A W₁ 1.2 m Paragraph V B W₂ B 0.3 m -1.5 mc T U ✓ 2.0 m A, T Ev ▶II Ev O + Re Ade Co

QUESTION 18 Find the coefficient of static friction us by using the equation (2).

The coefficient of static friction between the 150-kg crateand the ground is us = 0.3, while the coefficient of staticfriction between the 80-kg man's shoes and the groundis = 0.4.(Figure 1)%3D%3D Determine if the man can move the crate.

Three forces act on the ring. If the resultant force FR has a magnitude and direction as shown, determine the magnitude and the coordinate direction angles of force F3.

3. Determine the moment created by the force about the x, y, and z axes. Also,determine the moment about an axis extending between A and C.

Determine the angular acceleration of the members BC and CD.

4. Express the two forces pictured below as Cartesian vectors. F1 = 350 N and F2 = 250 N. Find the magnitude and coordinate direction angles of the resultant force.

2. Determine the resultant moment about point O for the system shown below.