An athlete holds a 7.5-kg shot put in his hand with his lower arm horizontal, as shown in the figure. His lower arm has a mass of 2.8 kg and its center of gravity (or center of mass) is 12 cm from the elbow-joint pivot. How much force must the extensor muscle (which is FM in the figure) in the upper arm exert on the lower arm?

Q: A 3 m long light (massless) board is supported at each end by cables. A painter weighing 900N stands…

A: We need to calculate tension in both the cables holding the light board.

Q: A mother leans horizontally over the crib to lift her 18.8 kg baby. The moment arm of the baby about…

A:

Q: At the gym, you notice a girl doing a “plank.” In this exercise, she holds the position shown…

A: ...

Q: Even when the head is held erect, as shown in the figure, its center of mass is not directly over…

A:

Q: A 35 N forearm (we are ignoring the hand for this problem) are held at a 45 deg angle to the…

A: Given data- A 35 N forearm are held at a 45 deg angle to the vertically oriented humerus. The COM of…

Q: A person bending forward to lift a load “with his back”(Fig. P8.23a) rather than “with his knees”…

A: Given data:W1 = 200 NW2 = 350 N

Q: A person bends forward to hold a dumbbell of 10.0-kg. The spine and upper body are pivoted at the…

A:

Q: In the figure, a 60 kgkg man walks out on a 14 kgkg beam that rests on, but is not attached to, two…

A: Given :-  mass of man = 60 Kg mass of beam = 14 kg

Q: 5.0 cm F.. M M F₁ CG W -2.5 cm

A: We need to consider the torque equilibrium, to calculate the force exerted by the muscles at the…

Q: Even when the head is held erect, as in the figure below, its center of mass is not directly over…

A: As there are two force acting perpendicular to a fixed point, these forces generate a torque around…

Q: What is the torque about your shoulder axis if you hold a 10.0 kg barbell in one hand straight out…

A:

Q: An essentially weightless shove is 120 cm long.  Someone holds it horizontally, supporting it with…

A: Approach to solving the question:Torque equilibrium ;We used the CG oof shovel  as the pivot point.…

Q: A person bending forward to lift a load "with his back" (Figure a) rather than "with his knees" can…

A:

Q: the horizontal arm is composed of 3 parts. the upper arm weight is 17.5N and the distance from the…

A:

Q: A small airplane is sitting at rest on the ground. Its center of gravity is 2.58 m behind the nose…

A: Total weight is balance by the weight supported by the two wheels.

Q: A thin 2.00 kg box rests on a 6.00 kg board that hangs over the end of a table, as shown. How far…

A:

Q: The leg in the image below is in a cast (obviously). The cast and leg together have a mass of 18 kg…

A:

Q: small airplane is sitting at rest on the ground. Its center of gravity is 2.58 m behind the nose of…

A:

Q: A man holds a 175-N ball in his hand, with the forearm horizontal (see the drawing). He can support…

A:

Q: A physics student is getting some physical education, specifically doing a pushup, so he’s supported…

A: Given: The mass of the student is 75 kg. The distance of the centre of mass from the shoulder is 39…

Q: 1. A8.0 m long, non-uniform beam weighing 750 N, supported by two weightless cables, is at rest in…

A:

Q: Assume a person bends forward to lift a load “with his back” as shown. The spine pivots mainly at…

A:

Q: Problem 5: Suppose a 875-kg car is on the bridge in the figure with its center of mass haltway…

A: Concept: In order to determine the tension and the magnitude of the Force, we will use the free body…

Q: A 20.0-m-tall hollow aluminum flagpole is equivalent in strength to a solid cylinder 4.00 cm in…

A: The Young’s modulus is the ratio of stress to strain. It is given by,

Q: Even when the head is held erect, as shown in the figure, its center of mass is not directly over…

A:

Q: in length with m

A: GivenLenth of plank, L=8 mMass of plank, M=65 kg

Q: Even when the head is held erect, as shown in the figure, its center of mass is not directly over…

A:

Q: A uniform 1.0-N meter stick is suspended horizontally at the middle. A 2.0-N weight is suspended…

A: length of meter stick is 1m  Let w1 = 2.0 N r1 = 10 cm from the stick let weight of 500 grams (0.5…

Q: The biceps tendon connects 4.00cm from the elbow and pulls straight up, while the barbell is held…

A:

Q: Approximately what magnitude force, FM, must the extensor muscle in the upper arm exert on the lower…

A:

Q: ould therefore exert a force to keep the head erect. That is why your head falls forward when you…

A: Solution: Given that  w = 55 N, r1 = 4.8 cm, and r2 = 2.9 cm.) magnitude N direction (upward,…

Center of Gravity of a system

The centre of gravity is a property that is based on the geometry of a rigid body or any particle. It is described as an equilibrium point or a hypothetical location where the total weight of the body is concentrated.