The meterstick shown is 100 cm long. It is free to pivot around its center of gravity (CG), which is at the 50 cm mark. There is a 20.0 N block hanging from the 80 cm mark. Decide where each of the other blocks should be placed, one at a time, to balance out the 20.0 N block. At what mark on the meter stick would you place a 19.0 N block to balance the 20.0 N block? mark: At what mark on the meter stick would you place a 44.0 N block to balance the 20.0 N block? mark: cm cm 10 20 3 2 30 40 50 60 70 80 1 90

When you bend over, a series of large muscles, the erector spinae, pull on your spine to hold you up. Figure shows a simplified model of the spine as a rod of length L that pivots at its lower end. In this model, the center of gravity of the 320 N weight of the upper torso is at the center of the spine. The 160 N weight of the head and arms acts at the top of the spine. The erector spinae muscles are modeled as a single muscle that acts at an 12° angle to the spine. Suppose the person shown bends over to an angle of 30° from the horizontal. a. What is the tension in the erector muscle? Hint: Align your x-axis with the axis of the spine.b. A force from the pelvic girdle acts on the base of the spine. What is the component of this force in the direction of the spine? (This large force is the cause of many back injuries).

Questions 1. A uniform meter stick pivoted at its centre, has a 100.0 g mass suspended at the 25.0 cm position. At what position should a 75.0 g mass be suspended to put the system in equilibrium? Show workings. 1 m 75 cm 25 cm 50 cm 75.0 g 100.0 g I

The meterstick shown is 100 cm long. It is free to pivot around its center of gravity (CG), which is at the 50 cm mark. There is a 25.0 N block hanging from the 80 cm mark. Decide where each of the other blocks should be placed, one at a time, to balance out the 25.0 N block.

A baseball bat balances 76.1 cm from one end. If a 0.500 kg glove is attached to that end, the balance point moves 26.7 cm toward the glove. $ % Part A Find the mass of the bat. mbat = Submit Provide Feedback 15. ΑΣΦ Search or type URL MacBook Pro Request Answer & 7 * 00 ? kg

The meterstick shown is 100 cm long. It is free to pivot around its center of gravity (CG), which is at the 50 cm mark. There is a 23.0 N block hanging from the 80 cm mark. Decide where each of the other blocks should be placed, one at a time, to balance out the 23.0 N block.   At what mark on the meter stick would you place a 16.0 N block to balance the 23.0 N block? mark:   At what mark on the meter stick would you place a 44.0 N block to balance the 23.0 N block? mark:

To get up on the roof, a person (mass 82.0 kg) places a 6.60 m aluminum ladder (mass 11.0 kg) against the house on a concrete pad with the base of the ladder 2.00 m from the house. The ladder rests against a plastic rain gutter, which we can assume to be frictionless. The center of mass of the ladder is 2 m from the bottom. The person is standing 3 m from the bottom. What are the magnitudes (in N) of the forces on the ladder at the top and bottom? top N bottom N

Three children are trying to balance on a seesaw, which consists of a fulcrum rock, acting as a pivot at the center, and a very light board 3.4 m long (Figure 1). Two playmates are already on either end. Boy A has a mass of 45 kg, and boy B a mass of 35 kg. ▼ Part A Where should girl C, whose mass is 25 kg, place herself so as to balance the seesaw? Express your answer to two significant figures and include the appropriate units. for Part A for Part Addo for Part redo for Part A reset for Part A keyboard shortcuts for Part A help for Part A x= Value Units

The 3.8 m long board shown in the image has a mass of 6.4 kg. The left support is 0.40 m from left end of the board. The right support is 1.2 m from the right end of the board. The cat has a mass of 5.0 kg and starts walking to the right. How far from the right support can the cat walk before the board tips over? (Give your answer in m.) Hints: There are two possible ways to solve this problem 1) Use the center of mass: Find the cat's position when the entire system's center of mass is at the right support. 2) Use torque: Set the pivot point at the right support and find the torque due to the weight of the beam and the weight of the cat. Answer:

The chewing muscle, the masseter, is one of the stron- gest in the human body. It is attached to the mandible (lower jawbone) as shown in Figure P8.33a. The jawbone is pivoted about a socket just in front of the auditory canal. The forces acting on the jawbone are equivalent to those acting on the curved bar in Figure P8.33b. F. is the force exerted by the food being chewed against the jawbone, T is the force of ten- sion in the masseter, and R is the force exerted by the socket on the mandible. Find T and R for a person who bites down on a piece of steak with a force of 50.0 N. 3.50 cm – 7.50 cm Masseter Mandible Б a Figure P8.33