A. Explain why placing your hands behind your head rather than placing them on your stomach makes sit-ups more difficult. B. Explain why it is easier (it requires a smaller force) to open a large jar than a small one.
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A. Explain why placing your hands behind your head rather than placing them on your stomach makes sit-ups more difficult.
B. Explain why it is easier (it requires a smaller force) to open a large jar than a small one.
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- 5. A meter stick has a pivot that is located in the middle (50 cm). On this meter stick we place 100 g @ 2 cm, 200 g @ 40 cm, 200 g @70 cm and 100 g @80 cm. a. How much mass needs to be placed at 55 cm in order to balance the meter stick. b. Where will you put 500 g in order to balance the meter stick?You are holding a meterstick of 0.23 kg horizontally in one hand. Assume that your hand is wrapped around the last 12 cm of the stick (see figure), so the front edge of your hand exerts an upward force, and the rear edge of your hand exerts a downward force. (a) What is the upward force? N (b) What is the downward force? NA horizontal meter stick supported at the 50-cm mark has a mass of 0.60 kg hanging from it at the 15- cm mark and a 0.40 kg mass hanging from it at the 70-cm mark. Determine the position on the meter stick at which one would hang a third mass of 0.50 kg to keep the meter stick balanced. A. 26 cm mark B. 56 cm mark OC. 58 cm mark D. 76 cm mark E. 84 cm mark
- 3. Two parents are doing some home improvement and their baby falls asleep on a board they are moving (parents of the year). The board is 3.80 m long and the baby is 0.45 m from one end of the board. The parents are holding the board from either edge. The board has a mass of 3.1 kg and the baby has a mass of 10.2 kg. Draw a free-body diagram and label each force and distances. Also choose and mark a pivot point for your board on the drawing. а. b. Write out E F and Ei for your diagram. Don't solve yet. For each of the torques you wrote down in part b, use the right-hand rule to say whether the direction of torque is into the page or out of the page. с.A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 5.04 g coins stacked over the 18.2 cm mark, the stick is found to balance at the 41.8 cm mark. What is the mass of the meter stick? Number i UnitsGinger was caring for her litter of puppies when the four curious pups spotted a cat for the first time. Each of the four pups leaned their full 8N of force against the board balanced between the puppies and the cat. How much force must Ginger apply to the other side to keep the pupies from knocking down the board? A- 32N B- 16N C- 8N d- 78N
- How close to the right edge of the 56 kg picnic table shown can a 70 kg man stand without the table tipping over? Hint: When the table is just about to tip, what is the force of the ground on the table’s left leg?A 3.0-m-long rigid beam with a mass of 100 kg is supported at each end, as shown. An 80 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam?A 4-m long, 150-kg steel beam is attached to a wall with one end connected to a hinge that allows the beam to rotate up and down. The other end of the beam is held in a horizontal position with a cable that makes a 27° angle with the beam and is attached to the wall (see (Figure 1)). a.What is the tension force that keeps this beam in static equilibrium? b. A mass of 75 kg is hung from the beam 3 meters away from the hinge (see (Figure 2)). Now what is the tension force that keeps this beam in static equilibrium? c.What is the vertical component of the force that the hinge exerts on the beam?
- When you carry shopping bags, rather than grasp the handles with your hand as in Q8.14a, you might choose to put them over your arm and slide the handle toward your elbow as in Q8.14b. Explain why this leads to less muscle effort to carry the bags and less force in your elbow joint.HelpWhen you bend your knee, the quadriceps muscle is stretched. This increases the tension in the quadriceps tendon attached to your kneecap (patella), which, in turn, increases the tension in the patella tendon that attaches your kneecap to your lower leg bone (tibia). Simultaneously, the end of your upper leg bone (femur) pushes outward on the patella. Shown is how these parts of a knee joint are arranged. What size force does the femur exert on the kneecap if the tendons are oriented as in the figure and the tension in each tendon is 60 N?