A waiter holds two plates of food in one hand. His forearm has a mass of 2.8kg and the centre of mass of his forearm is located 11cm from his elbow joint. The centre of mass of the two plates is located 32cm from his elbow joint and the total mass of the two plates is 1.75kg. His bicep is attached to the bones of his forearm is 3.6cm from his elbow joint. Assume his forearm is held completely horizontal. a. What is the torque produced by the mass of the two plates? Torque = Nm b. What is the torque produced by the mass of the waiter's forearm? Torque = 0 c. What force must be exerted by the waiter's biceps muscle to ensure that the plates and forearm are motionless? Ny Force = Nm

Consider the following distribution of objects: a 4.00-kg object with its center of gravity at (0, 0) m, a 1.20-kg object at (0, 3.00) m, and a 3.40-kg object at (4.00, 0) m. Where should a fourth object of mass 6.00 kg be placed so that the center of gravity of the four-object arrangement will be at (0, 0)?

A person is standing on a level floor. His head, upper torso, arms, and hands together weigh 438 N and have a center of gravity that is 1.28 m above the floor. His upper legs weigh 144 N and have a center of gravity that is 0.760 m above the floor. Finally, his lower legs and feet together weigh 87 N and have a center of gravity that is 0.250 m above the floor. Relative to the floor, find the location of the 11. center of gravity for his entire body.

Two people on skates, one with a mass of 60 kg and the other with a mass of 40 kg, stand on ice (frictionless surface) holding a 10 m pole (negligible mass).  The skaters pull themselves from the end of the pole until they meet.  How far does the 40 kg skater move.

Fred Flintstone’s club–ax is made up of two parts:  an uniform 2.5 kg stick and a symmetrical 8 kg stone attached to the end of the stick.  The dimensions of the club-ax are shown in the figure.  How far is the center of mass from the handle end of the club-ax? Express your answer in cm.

The drawing shows a human figure approximately in a sitting position. For the purposes of this problem, there are three parts to the figure, and the center of mass of each one is shown in the drawing. These parts are: (1) the torso, neck, and head (total mass = 44.7 kg) with a center of mass located on the y axis at a point 0.353 m above the origin, (2) the upper legs (mass = 18.5 kg) with a center of mass located on the x axis at a point 0.157 m to the right of the origin, and (3) the lower legs and feet (total mass = 10.1 kg) with a center of mass located 0.490 to the right of and 0.261 m below the origin. Find the (a) x coordinate and (b) the y coordinate of the center of mass of the human figure. Note that the mass of the arms and hands (approximately 12% of the whole-body mass) has been ignored to simplify the drawing. +x

this is solution true or false

She lies on a plank on two scales: one at her head, the other at her feet.  They are 1.71 meters apart.  Her head scale reads 386 N, and her foot scale reads 398 N. How far from her feet is her center of mass?

What are (a) the x coordinate and (b) the y coordinate of the center of mass for the uniform plate shown in the figure if L = 5.0 cm? 3L 4L (a) Number i (b) Number i 2L 2L 4L ! 2L | IL -X Units Units E m

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 the plastic rain gutter which we can assume to be frictionless. The center of mass of the ladder is 2.00 m from the bottom. The person is standing 3.00 m from the bottom. What are the magnitudes of the forces on the ladder at the top and bottom?