While exercising in a fitness center, a man lies face down on a bench and lifts a weight with one lower leg by contractingthe muscles in the back of the upper leg. The weight has mass 13.5 kg, and is a distance of 28.0 cm from the knee joint. Themoment of inertia of the lower leg is 0.900 kg m², the muscle force is 1470 N, and its effective perpendicular lever arm is3.55 cm. Find the magnitude of the angular acceleration a of the weight.a =rad/s?Fow much work W is done if the leg rotates through an angle of 20.0° with a constant force exerted by the muscle?W =JI

Answered: Image /qna-images/answer/94fe4c0e-a2fa-4b37-a963-5485e92b170f.jpg

While exercising in a fitness center, a man lies face down on a bench and lifts a weight with one lower leg by contracting the muscles in the back of the upper leg. The weight has mass 13.5 kg, and is a distance of 28.0 cm from the knee joint. The moment of inertia of the lower leg is 0.900 kg m2, the muscle force is 1470 N, and its effective perpendicular lever arm is 3.55 cm. Find the magnitude of the angular acceleration a of the weight. a = rad/s2 Fow much work W is done if the leg rotates through an angle of 20.0° with a constant force exerted by the muscle? J W =

While exercising in a fitness center, a man lies face down on a bench and lifts a weight with one lower leg by contracting the muscles in the back of the upper leg. The weight has mass 13.5 kg, and is a distance of 28.0 cm from the knee joint. The moment of inertia of the lower leg is 0.900 kg m2, the muscle force is 1470 N, and its effective perpendicular lever arm is 3.55 cm. Find the magnitude of the angular acceleration a of the weight. a = rad/s2 Fow much work W is done if the leg rotates through an angle of 20.0° with a constant force exerted by the muscle? J W =

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

A horizontal wire holds a solid uniform ball of mass (m) in place on a tilted ramp that rises 35.0° above the horizontal. ihe Surface of this ramp is perfectly smooth, and the wire is directed anay from the cen ter of the ball. (3.) What is the tension in the nire? 35.0°
(b) For what value of m is the beam in equilibrium? m = i 3.235
The arm in the figure below weighs 35.1 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force F, in the deltoid muscle and the force F, exerted by the shoulder on the humerus (upper- arm bone) to hold the arm in the position shown. (Enter your answers to at least the nearest newton.) Ft Fs F, J12° F, 0.080 m 0.290 m
A gymnast rises onto her toes, as shown in the picture on the right. The floor pushes up on the ball of her foot with a force of N=313 N. If 0=56.0°, what are FH the forces in her heel (TH) and ankle joint (T), and what is the angle o? Answers: TH=481 N; T,=761 N; b=20.7° N, 0. 4.25 cm 9.66 cm 5.
A uniform plank of length 2.00 m and mass 30.0 kg issupported by three ropes, as indicated by the blue vectors inFigure P8.27. Find the tension in each rope when a 700.-Nperson is d = 0.500 m from the left end.
A uniform plank of length 2.00 m and mass 31.0 kg is supported by three ropes, as indicated by the blue vectors in the figure below. Find the tension in each rope when a 680-N person is d = 0.500 m from the left end. magnitude ofT magnitude of T, magnitude of T, N N N 40.0° 2.00 m
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 is 1.30 kg . If the biceps is connected to the forearm a distance dbiceps = 3.00 cm from the elbow, how much force Fbiceps must the biceps exert to hold a 750 g ball at the end of the forearm at distance dball = 35.0 cm from the elbow, with the forearm parallel to the floor? How much force Felbow must the elbow exert? (Figure 1)
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 is 1.30 kg . If the biceps is connected to the forearm a distance dbiceps = 3.00 cm from the elbow, how much force Fbiceps must the biceps exert to hold a 750 g ball at the end of the forearm at distance dball = 35.0 cm from the elbow, with the forearm parallel to the floor? How much force Felbow must the elbow exert? What is the horizontal distance dforearm between the elbow and the point where the weight of the forearm acts?
An 2992 N beam is loaded with two file cabinets (labeled 1 & 3) and hoisted at a constant velocity to the 50th story of a building. Cabinet 1 weighs 573 N and is centralized at 1 m from the supporting cable (TL "Left rope tension") located to its left. Cabinet 3 weighs 859 N and is placed 3 Im from that same supporting cable. Find TL where the length of the beam is 4 m. Is TL and TR the same or different? 644.5 Newtons 2140.5 Newtons 716 Newtons 2283.5 Newtons 2212 Newtons 1 None of the above answers are correct.
While doing a back squat, you're doing reps with 300 pounds on the barbell (total mass of the barbell and weights; you're strong...you got this!). At the bottom of your squat, your hip is flexed to a 45deg angle, your knee is flexed to a 90deg angle, and your ankle is dorsiflexed to 75deg. The force vector of the barbell is 15cm anterior from the hip joint, 20cm posterior from the knee joint and 12cm anterior from the ankle joint. How much torque is the barbell applying to the hip joint? 138.29Nm extension torque 160.53Nm extension torque 200.66Nm flexion torque News team....ASSEMBLE!!!!!! O 267.55 Nm flexion torque
While doing a back squat, you're doing reps with 300 pounds on the barbell (total mass of the barbell and weights; you're strong...you got this!). At the bottom of your squat, your hip is flexed to a 45deg angle, your knee is flexed to a 90deg angle, and your ankle is dorsiflexed to 75deg. The force vector of the barbell is 15cm anterior from the hip joint, 20cm posterior from the knee joint and 12cm anterior from the ankle joint. How much torque is the barbell applying to the hip joint? 160.53Nm extension torque 200.66Nm flexion torque 138.29Nm extension torque News team....ASSEMBLE!!!!!! 267.55 Nm flexion torque
A stepladder of negligible weight is constructed as shown in the figure below, with AC = BC = { = 3.60 m. A painter of mass m = 69.0 kg stands on the ladder d = 3.00 m from the bottom. m C d В Assuming the floor is frictionless, find the following. (Suggestion: Treat the ladder as a single object, but also treat each half of the ladder separately.) (a) the tension in the horizontal bar DE connecting the two halves of the ladder N (b) the normal forces at A and B at A at B N (c) the components of the reaction force at the single hinge C that the left half of the ladder exerts on the right half rightward component upward component