Replace the loading system by an equivalent resultant force and a couple moment acting at point OO. Assume F1= 150 N , F2= 210 N and Mc= 85 N⋅m

A person has a mass of 45 kg is running with a velocity of 12.0 m/s. All of a sudden, the person plants their feet and stops abruptly in 3.75 m. This was some mighty agressive stoppage power! Your answer to part (a) may reflect that. a. What was the coefficient of friction between their shoes and the ground in order to do so? b. If it took place in 0.625 seconds how much power was expended by friction on the person?

What is the Net Force Cart Mass, mc . 284 kg Angle, theta 49 degrees Distance, d . 75 m Suspended Mass, ms . 240 kg Velocity 1 .664 m/s Velocity 2 .672 m/s  Velocity 3 . 670 m/s Average Velocity . 669 m/s Kinetic Energy . 064 J

The 11 kg disk has an angular velocity of w = 20 rad/s. (Figure 1) Figure 400 mm 500 mm 200 mm- A B ⒸO 500 mm с P (N) 5 2 1 of 1 -t(s) Part A If the brake ABC is applied such that the magnitude of force P varies with time as shown, determine the time needed to stop the disk. The coefficient of kinetic friction at B is μ = 0.4. Neglect the thickness of the brake. Express your answer to three significant figures and include the appropriate units. t = 0 Submit Value μA Provide Feedback Request Answer Units ? Next >

(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) N 0.88 m m = 56 kg CG W 1.46 m W Freaction (b) How much work (in J) does she do if her center of mass rises 0.180 m? (c) What is her useful power output (in W) if she does 24 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.)

. The forces exerted by the bicep muscle and acting on the elbow when a 12 kg barbell is being curledcan be modeled based on the diagram above. The bicep muscle can be treated as a vertical cable. Themass and length of the forearm are 2 kg and 32 cm, respectively. The center of mass of the forearm is adistance of 14 cm from the point P, while the bicep connects to the forearm at a point 4.5 cm from P.a) Determine the tension in bicep muscle and the force of the humerus acting downward on the elbowat point P. b) Assuming the tension in the bicep muscle continues to be oriented vertically, determinethe tension in the bicep muscle and the force acting at P after the barbell has been raised by an angleof 30 relative to the horizontal.