A lunch tray is being held in one hand, as the figure illustrates. The mass of the tray itself is 0.237 kg. and its center of gravity is located at its geometrical center. On the tray is a 1.19-kg plate of food and a 0.241-kg cup of coffee. Obtain (a) the force 7 exerted by the thumb and (b) the force exerted by the four fingers. Both forces act perpendicular to the tray, which is being held parallel to the ground.

A makeshift sign hangs by a wire that is extended over an ideal pulley and is wrapped around a large potted plant on the roof as shown in the figure below. When first set up by the shopkeeper on a sunny and dry day, the sign and the pot are in equilibrium. The mass of the sign is 21.0 kg, and the mass of the potted plant is 61.5 kg. Plant sale today! (a) Assuming the objects are in equilibrium, determine the magnitude of the static friction force experienced by the potted plant. A What is the maximum value of the static friction fwce if the coefficient of static friction between the pot and the roof is 0.4412 N

a person holds a 10.0kg weight in a forearm that is horizontal with the vertical upper arm. The biceps muscles exerts a force Fm distance of d=4.00cm at the elbow joint of horizontal forearm and the upper arm. The mass of the forearm is 1.10kg and its length from the elbow is 32.00cm. A)what is magnitude of muscle force Fm? B) what is magnitude and direction of force F on the forearm at the elbow joint? C) What is the magnitude and direction of force on the elbow joint by the forearm? Model this as an uniform rod

The leg and cast in the figure weigh 220 N (w1). Determine the weight w2 and the angle a needed so that the leg and the cast do not exert any force on the hip joint.

When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm with hand is 1.80 kg. If the biceps is connected to the forearm a distance of 2.50 cm from the elbow, how much force must the biceps exert to hold a 44.5 N (about 10 lbs) ball at the end of the forearm at distance of 35.0 cm from the elbow, with the forearm parallel to the floor, in Newtons? Use g = 10.0 m/s2.

When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm with hand is 1.80 kg. If the biceps is connected to the forearm a distance of 2.50 cm from the elbow, how much force must the biceps exert to hold a 44.5 N (about 10 lbs) ball at the end of the forearm at distance of 35.0 cm from the elbow, with the forearm parallel to the floor, in Newtons? Use g = 10.0 m/s². Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. k driceps -Biceps -drall X

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A 200-kg robotic arm at an assembly plant is extended horizontally (see figure below). The massless support rope attached at point B makes an angle of 12.0° with the horizontal, and the center of mass of the arm is at point C. (Assume that L1 = 1.42 m and L2 = 2.62 m.) (a) What is the tension in the support rope? (b) What are the magnitude and direction of the force exerted by the hinge A on the robotic arm to keep the arm in the horizontal position?magnitude = _____ Ndirection =  _______° counterclockwise from the +x axis

.A monkey is hanging on a tree branch that is inclined upwards 30 degrees from the horizontal to grab a hand of bananas. He is about 4 m from the tree trunk and the bananas are still 3 meters away from its position. Use the principle of static equilibrium to determine the mass of the monkey if the mass of the bananas is 5 kg.

Consider the 62.0 ?? mountain climber in Figure 10. Find the tension in the rope and theforce that the mountain climber must exert with her feet on the vertical rock face toremain stationary. Assume that the force is exerted parallel to her legs. Also, assumenegligible force exerted by her arms.