How much work has a pitcher done on a baseball

Thread starter physicsgsu
Start date Sep 28, 2010
Tags

Baseball Work

AI Thread Summary

To calculate the work done by the pitcher on the baseball, the kinetic energy formula is used, where work equals the change in kinetic energy. Given the mass of the baseball is 0.140 kg and its speed is 30.0 m/s, the kinetic energy can be calculated as 0.5 * mass * velocity squared. This results in a kinetic energy of 63 Joules, indicating the work done by the pitcher on the ball. The discussion highlights the importance of understanding kinetic energy in solving physics problems related to motion. The problem was resolved successfully by applying the correct formula.

Sep 28, 2010

physicsgsu

Homework Statement

A 0.140 kg baseball leaves a pitcher's hand at a speed of 30.0 m/s.
If air drag is negligible, how much work has the pitcher done on the ball by throwing it?

I don't even know where to start. I feel like if someone could help me find force i would be able to finish the problem

Physics news on Phys.org

Sep 28, 2010

physicsgsu

nvm, figured it out

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .

View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...

View full post »