We can stand for a longer time in the position on the left compared to the position on the right because (ignore the box): 범 the barbell creates more torque in the left-side position O the weight is heavier in the right-side position Ⓒour muscles can generate force for long periods of time H

Why is it more difficult to do a sit-up with your hands behind your head than when your arms are stretched out in front of you? A diagram may help you to answer this.

(10 Marks) If W = Wo = 20.2 N; angle of Fm with horizontal is 45 degrees (cos(45)=sin(45)=0.7 Locations from the joint center, (where Fj is acting) for Fm = 3 cm; for Wo = 15 cm and for W = 30 cm. Select the best choice for each from (a) to (h) below: (a) Take moments about the joint center to find Fm = N (b) Rotational component of Fm = N (c) Sliding component of Fm = N (see more in the options for (d) to (h)

⦁ Imagine that you hold a 6.0kg lead ball in your hand with your arm bent. The ball is 0.35m from the elbow joint. The biceps muscle attaches to the forearm 0.050m from the elbow joint and exerts a force on the forearm that allows it to support the ball. The center of mass of the 12N forearm is 0.16m from the elbow joint. Estimate the magnitude of⦁ The force that the biceps muscle exerts on the forearm ⦁ The force that the upper arm exerts on the forearm at the elbow

The figure shows a 1280 kg car that has slipped over the edge of an embankment. People are trying to hold the car in place by pulling on a horizontal rope. The car's bottom is pivoted on the edge of the embankment, and its center of mass lies farther back, as shown. 2,4m 1,8m 3 If the car makes a 34 degree angle with the horizontal, what force must the people apply to hold it in place? T=_N

A 71-kg man stands on his toes by exerting an upward force through the Achilles tendon, as shown in the figure. (Image attached) What is the force in newtons in the Achilles tendon if he stands on one foot? Calculate the force in newtons at the pivot of the simplified lever system shown—that force is representative of forces in the ankle joint.

To strengthen his arm and chest muscles, a 79-kg athlete 2.0 m tall is doing a series of push-ups as shown in the figure below (Eigure 1). His center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0 cm from the top of his head. Figure -2.0m 1 of 1 30.0 cm Find the force that the floor exerts on each of his feet, assuming that both feet exert the same force. Express your answer in newtons. F= Submit Part B F= [5] ΑΣΦ Submit Request Answer Find the force that the floor exerts on each of his hands, assuming both palms exert the same force. Express your answer in newtons. 1971 ΑΣΦ Request Answer ? N N

In the figure below, both the ceiling and the ruler accelerate together at 1.6 m/s2 in the +y direction, and the reading to the "new" length of the vertical wire is as indicated. Ignore the effect on the two diagonal wires. Other parameters are below: Weight of the pan = 5 N Weights (or loads) = 74 N Originally, the wire has a length 0.200 cm, and diameter of 2.7 cm. Calculate the Young's modulus of the wire in Pa. NOTES: Use pi = 3.14. Final answer in ZERO decimal place. 4.000 4.100 4.200 4.300 cm

2-3 sentences only.

| Grip. In the engineering design of handles (such as on manual and powered hand tools) and rails (such as for stair- ways), the grip and possible slip of a hand must be considered. If a hand grips a cylindrical handle with a diameter of 30 mm and with a normal force on the hand at 150 N, what is the maximum tangential frictional torque when the coefficient of static friction is 0.25? Answer: 0.56 N. m