Why is it important to secure file cabinets to the floor, especially cabinets with heavy loads in top drawers?

A ruler with the length of 100 cm and mass of 100g has the pivot point at 35 Cm. Jason suspends an object at 10 cm mark and the system stayed balanced. What is the object mass in grams?

A 2×12 board of airdried Southern Yellow Pine (~12% moisture) is about 2.18 kg per linear foot. A physicist and his wife carry a 16-foot length of Southern Yellow Pine lumber, the physicist gallantly carries the board from one end while his wife carries the board 4 feet from the other end. How much weight is each spouse carrying? This is an equilibrium problem. Assume the board is perfectly uniform.

When you rub your hands together, can you push harder on one hand than the other?

A gymnast (240 lbs) is hanging between two rings. His two arms make an 80° angle with his body. What load (in pounds) does he feel in each arm? Repeat with an 85° angle with his body. What would eventually happen if he tried to have his arms parallel to the ground (or as the angle approaches 90°)?

When a tension of 70 N is applied to a piano wire of length 1.8 m, it stretches by 2.0 mm. If the same tension is applied to a similar piano wire of length 3.6 m, by how much will it stretch?

When throwing a football you are always instructed to follow-through.  What is the advantage of this? You are also instructed to stand with your feet about shoulder-width apart.  What is the advantage of this?

The 600-kg uniform I-beam supports the load shown. Determine the reactions at the supports. Answers: Ax Ay = = By = p -7.5 m- +4.5 m 285 kg N N N B

A 25-ft chain with a weight of 30 lb is suspended between two points at the same elevation. Knowing that the sag is 10 ft, determine (a) the distance between the supports, (b) the maximum tension in the chain.

Modern commercial airliners are largely made of aluminum, a light and strong metal. But the fact that aluminum is cheap enough that airplanes can be made out of it is a bit of historical luck. Before the discovery of the Hall-Héroult process in 1886, aluminum was as rare and expensive as gold. What would happen if airplanes had to be made of steel? The fuselage of the Boeing 747, which can carry 400 passengers, is approximately a hollow aluminum cylinder without ends, 70.7 m long, 6.5 m wide, and 2.5 mm thick (see sketch at right). The fuselage of an airplane Suppose this fuselage was made of steel (density 7.87 g/cm³) instead of aluminum (density 2.70 g/cm³), and let's say the average passenger has a mass of 79 kg. We'll also assume the engines can't lift any greater mass than they already do. Calculate the number of passengers that the Boeing 747 could carry if its fuselage was made of steel. 0 X