While doing dumbbell curls, a person generated an elbow joint flexion moment of 25.6N while flexing their elbow over 120-degree range. How much mechanical work was done? • If it took the person 0.78 seconds to lift the weight, what is the mechanical power?
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- 3. In this question you will do some algebra to determine two relations that you will need for Part 2 of this lab. Write down Eq. 11 twice. In the first statement, set the rotational kinetic energy term equal to zero (i.e. lw? = 0) –- call this your "No Krot model". Leave the second as it is written in Eq. 11– call this your "Krot model". For both models, solve for v in terms of g, h, and a. In the Krot model, you will need to use I (Eq. 3) and w = KMR2 /r. The solution for the Krot model will have a k term as well. Once you have solved for v, use the kinematic relation, v = and the trigonometric relationship, h both models separately. at, = L sin 0, solve for t for NOTE: L is the length of the incline plane. NOTE: a is different for the two models (refer to the "Rotational Mechanics" discussion in the introduction): In the "No Kpot model", a = g sin 0 (remember the Newton's 2nd Law lab) In the "Krot model", a is given by equation 8 These two solutions represent the predicted time it…A car rounds a freeway exit turn of radius 40m at constant speed of 20m/s. The turn goes 3/4 around(not a full circle). How much work is done by the friction force on the car’s tires that allows it to turn?Energy conservation with conservative forces: A very small 100-g object is attached to one end of a massless 10-cm rod that is pivoted without friction about the opposite end. The rod is held vertical, with the object at the top, and released, allowing the rod to swing. What is the speed of the object at the instant that the rod is horizontal? 1.8 m/s 1.4 m/s 0.71 m/s 2.8 m/s 4.0 m/s fbb
- This question have changed to ask the factor, how should I answer it? thank you so much!1. •• A 68-kg skier encounters a dip in the snow’s surface thathas a circular cross section with a radius of curvature of 12 m. Ifthe skier’s speed at point A in Figure 8–25 is 8.0 m/s, what is thenormal force exerted by the snow on the skier at point B? Ignorefrictional forces.(a)Solve in Newton Law, Conservation Law and Work-Kinetic Thoem.Consider a hoop of mass 3.1 kg and radius 0.52 m that rolls without slipping down an incline. The hoop starts at rest from a height h = 2.7 m above the bottom of the incline and then rolls to the bottom.
- (b) The following diagram shows a football rolling from A to G. Which letter shows the ball when it has the (1) Maximum kinetic energy and (ii) Maximum potential energy? Answer : The maximum potential energy at and maximum kinetic energy atBased on your measurements of vertical position vs time you should have noticed that the maximum height of the ball decreases with each subsequent bounce. A basic analysis of kinetic energy and gravitational potential energy conservation would imply that each bounce should result in the ball returning to the same height from which it was initially dropped. Explain why the height of each subsequence bounce decreases, and why this does not violate the overall conservation of energy.