BackA mobile at the art museum has a 2.0 kg steel cat and a 4.0 kg steel dog suspended from a lightweight cable, as shown in FIGURE EX7.21. It is found that = 20° when the center rope is adjusted to be perfectly horizontal. What are the tension and the angle of rope 3?
An accident victim with a broken leg is being placed in traction. The patient wears a special boot with a pulley attached to the sole. The foot and boot together have a mass of 4.0 kg, and the doctor has decided to hang a 6.0 kg mass from the rope. The boot is held suspended by the ropes, as shown in FIGURE P6.40, and does not touch the bed. Determine the amount of tension in the rope by using Newton's laws to analyze the hanging mass. Hint: If the pulleys are frictionless, which we will assume, the tension in the rope is constant from one end to the other.
A home mechanic wants to raise the 310-kg engine out of a car. The plan is to stretch a rope vertically from the engine to a branch of a tree 6.0 m above, and back to the bumper (Fig. 12–96). When the mechanic climbs up a stepladder and pulls horizontally on the rope at its midpoint, the engine rises out of the car. How much force must the mechanic exert to hold the engine 0.50 m above its normal position?
A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 1000 N, the players have equal pulls, and the angle between the two ropes is 20°. How hard must each player pull to drag the coach at a steady 2.0 m/s?
Which of the following is an example of static equilibrium?
When calculating the total weight the ladder is to support in a 2D equilibrium problem, you must include:
A planar truss is loaded only at its joints. At joint , only two non-collinear members and meet, and there is no external load or support reaction at . Which of the following statements correctly identifies the zero-force members in this configuration?
A cat dozes on a stationary merry-go-round. Which of the following statements best describes the forces acting on the cat in terms of equilibrium in two dimensions?
If an object is in equilibrium in two dimensions, which of the following statements must be true?
Which of the following examples best represents an object with balanced forces acting upon it in two dimensions?
Which of the following force diagrams represents an object in equilibrium in two dimensions?
Which of the following conditions must be satisfied for an object to be in static equilibrium in two dimensions?
Which of the following objects is in static equilibrium?
An object in mechanical equilibrium is an object that: