When visiting some countries, you may see a person balancing a load on the head. Explain why the center of mass of the load needs to be directly above the person's neck vertebrae.
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When visiting some countries, you may see a person balancing a load on the head. Explain why the center of mass of the load needs to be directly above the person's neck vertebrae.
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- (a) Calculate the magnitude and direction of the force on each foot of the horse in Figure 9.31 (two are on the ground), assuming the center of mass of the horse is midway between the feet. The total mass of the horse and rider is 500kg. (b) What is the minimum coefficient of friction between the hooves and ground? Note that the force exerted by the wall is horizontal.To get up on the roof, a person (mass 70.0 kg) places a 6.00-m aluminum ladder (mass 10.0 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 of the forces on the ladder at the top and bottom?Two match officials carry an injured rugby player from a rugby field on a stretcher. The rugby player weighs 95 kg and the stretcher is 2.5 m long. One of the stretcher bearers (bearer A) is able to lift a weight of 60 kg; the other (bearer B) is unsure how much weight he is able to lift. How much weight must bearer B support? How far from bearer A must the injured rugby players center of mass be in order for the stretcher bearers to carry the load without tipping the injured player out?
- To determine the location of his center of mass, a physics student lies on a lightweight plank supported by two scales L = 4.60 m apart. (a) If the left scale reads 349 N, and the right scale reads 164 N, find the student's mass. kg (b) Find the distance from the student's head to his center of mass.A large airplane typically has three sets of wheels: one at the front and two farther back, one on each side under the wings. Consider the Boeing 787 "Dreamliner", with a mass of 198000 kg. In this particular model, the distance from the front wheels to the rear set of wheels is 23.8 m. a) If the center of mass of the airplane is along a line through the center and 3.00 m in front of the rear wheels, how much force, in meganewtons, does the ground exert on each set of rear wheels when the plane is at rest on the runway? b) How much force, in meganewtons, does the ground exert on the front set of wheels?In exercise physiology studies, it is sometimes important to determine the location of a person’s center of mass. This determination can be done with the arrangement as shown. A light plank rests on two scales, which read Fg1 = 380 N and Fg2 = 320 N. A distance of 1.65 m separates the scales. How far from the woman’s feet is her center of mass?
- Two scales are separated by 2.00 m, and a plank of mass 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after which the right scale reads 30.0 kg and the left scale reads 50.0 kg. How far from the right scale is the person's center of gravity located?A man is holding the yoga position shown. The center of gravity of the combination of his head, arms, and torso is shown as a red symbol on his torso; the center of mass of his legs and feet is a red symbol on his legs. Which of positions A through D corresponds to the center of mass of his entire body?A girl and a boy stand at opposite ends of a 3.0 m long uniform board with mass 50 kg. The girl's mass is 30 kg and the boy's mass is 40 kg. Where is the center of mass of the girl/board/boy system?
- A uniform 1.0-N meter stick is suspended horizontally at the middle. A 2.0-N weight is suspended from the 10-cm position on the stick. Where should you place a 500 grams of mass in order to keep the meter-stick horizontal?A 72 kg and 180-cm tall person lies on a light (massless) board which is supported by two scales A and B. Scale A is under the top of her head and scale B is at the bottom of her feet. If the center of mass of the person is located 100 cm from the bottom of her feet (or 80 cm from the top of her head). What will be the scale reading on scale A? KROGRAMS O a. 72 kg O b. 32 kg O c. 36 kg d. 40 kg B KELOGRAMSProblem 3: A large airplane typically has three sets of wheels: one at the front and two farther back, one on each side under the wings. Consider the Boeing 787 "Dreamliner", with a mass of 189000 kg. In this particular model, the distance from the front wheels to the rear set of wheels is 21 m. Part (a) If the center of mass of the airplane is along a line through the center and 3.00 m in front of the rear wheels, how much force, in meganewtons, does the ground exert on each set of rear wheels when the plane is at rest on the runway? F, = sin() cos() tan() 8 9 HOME cotan() asin() acos() E 5 6 atan() acotan() sinh() 2 3 cosh() tanh() cotanh() END ODegrees O Radians Vol BACKSPACE DEL CLEAR Submit Feedback I give up! Hint Part (b) How much force, in meganewtons, does the ground exert on the front set of wheels?