Find the rotational kinetic energy of the pitchers arm

Reference no: EM13342445

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 0.650 kg mass?

Reference no: EM13342445

Questions Cloud

Find the final temperature of the system : A copper pot with a mass of 0.485kg contains 0.175kg of water, and both are at a temperature of 20.0?C. Find the final temperature of the system

Loss allocation : Loss Allocation

Calculate how much work does she do : To develop muscle tone, a woman lifts a 4.50 kg mass held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. How much work does she do

Explain what is the value of q for burning : If the heat capacity of the calorimeter and contents was 12.05kJ/C, what is the value of q for burning 1.25 mol of benzene at constant volume and 25Ce reaction is C6H6(l)+15/2O2(g)?6CO2(g)+3H2O(l)

Find the rotational kinetic energy of the pitchers arm : A softball pitcher throws an underhanded pitch with the arm fully extended (straight at the elbow). Find the rotational kinetic energy of the pitcher's arm given its moment of inertia is 0.72 kg·m2

Compute ending inventory and cost of goods sold : Compute ending inventory and cost of goods sold under FIFO, LIFO, and average cost inventory costing methods.

Calculate the angular momentum of an ice skater : Calculate the angular momentum of an ice skater spinning at 6.00 rev/s given his moment of inertia is 0.490 kg·m2

Explain half-reactions describing the oxidation : Study The chemical reaction Fe + I2 = FeI2 Then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction

What is the optimal hedge ratio : Explain why an American option is always worth at least as much as its intrinsic value. Explain carefully the difference between writing a put option and buying a call option.

User Account

All Pages