Find the rotational kinetic energy of the pitcher arm

Reference no: EM13997624

A softball pitcher throws an underhanded pitch with the arm fully extended (straight at the elbow). The ball leaves the pitcher's hand with a speed of 25 m/s. Assume that the pitching motion originates with the arm straight back and terminates with the arm straight down. Do not ignore gravity.

(a) Find the rotational kinetic energy of the pitcher's arm given its moment of inertia is 0.72 kg.m2 and the ball leaves the hand at a distance of 0.600 m from the pivot in the shoulder.

(b) What force did the muscles exert to cause the arm to rotate if their effective perpendicular lever arm was 4.00 cm and the ball had a 0.550 kg mass?

Reference no: EM13997624

Questions Cloud

To what extent do you see that event being repeated : Describe at least one idea you learned about U.S. history that you may not have known or now understand differently. Here are some topics we have reviewed over the weeks.

An unknown contains citric acid : An unknown contains citric acid, C6H8O7, a tribasic acid, and potassium chloride. If 2.135g of unknown requires 19.90 mL of 0.688 NaOH for complete neutralization of all reactive protons, calculate the percent by mass of citric acid in the sample. I..

Find the magnitude and direction of the average force : A soccer ball of mass 450 grams is initially moving horizontally east at 16 m/s. You kick it so that it moves horizontally north at 17 m/s. The collision lasts 0.05 s. Find the magnitude and direction of the average force you apply to the ball.

Set up the net ionic equations : Set up the net ionic equations for (a) the neutralization of HCl and (b) the neutralization of choloroacetic acid in such a way that they sum to the equation for (c) the dissociation of choloroacetic acid. Use Hess' law of heat of summation to find t..

Find the rotational kinetic energy of the pitcher arm : Assume that the pitching motion originates with the arm straight back and terminates with the arm straight down. Do not ignore gravity. Find the rotational kinetic energy of the pitcher's arm given its moment of inertia is 0.72 kg.m2 and the ball l..

What size resistor do you need to connect to the ammeter : An ammeter with a full scale deflection for I = 14.0 A has an internal resistance of 21.0 ohms. What size resistor do you need to connect to the ammeter, and should it be in series or parallel?

How many watt light bulbs equivalent sun total power output : Solar power roughly equivalent to the light from ten 100 watt light bulbs falls on each square meter of the Earth's surface. Using the fact that Earth is 1.5 X 1010 from the sun, and that the sun radiates energy equally in all directions, estimate..

What is the velocity of the ambulance : An observer at rest hears a frequency of 520 Hz as it approaches, and then hears a frequency of 440 Hz after it has passed. What is the velocity of the ambulance, assumed constant during this time?

Develop a project vision statement : Can your experts do this under Modelling Enterprise Architecture - You should identify an IS/IT project that Valentinos need. Develop a Project Vision statement, a Scope diagram and identify some potential benefits and costs.

User Account

All Pages