Chem Help...Calculate the kinetic energy in joules of a 40. g golf ball moving at 67 m/s...?

Question

Calculate the kinetic energy in joules of a 40. g golf ball moving at 67 m/s

________J

Convert this energy to calories. ______cal

What formula do I need for these? Thanks in advance!

Answer 1

take the diameter of the golf ball calculated while still in the air, add the RPM and multiply by 2.3323300589, then substract Pi, and get the square root. Take that number and add the weight (40gr) and multiply by speed, but first convert speed to km/hr.

The final number should by multiply by your closest friends handicap, and the add your handicap. That is the kinetic energy in joules. To convert to calories, just add the calories of a granola bar.

Hope that helps you improuve your game, good luck!

Answer 2

The equation you need is KE=0.5*m*v^2, where m is mass in kilograms and v is velocity in m/s.

40 g=0.04 kg, and you were given 67 m/s.  Multiply them together: 0.5*.04*(67*67) to get your answer in joules.

Here's the other equation you need: 1 cal=4.184 joules.

Answer 3

Suggest you talk to your teacher........Homework  is not my thing.