1. Estimate the kinetic energy of
i) A grand prix car at full speed
ii) An olympic sprinter
iii) An Ant
iv) the Earth in its orbit

Question

stormfire1 · Answer

[Corrected typo]
Google the masses and max velocities of each item and use the formula:
$$KE=\frac{1}{2}mv^2$$It shouldn't take more than a few minutes...just make sure you keep the units straight (ie: masses in kg and velocity in m/s...that's the simplest way). 

Here's an example for a formula 1 race car with a mass of 640kg and a top speed of 92 m/s:
$$KE=\frac{1}{2}(640kg)(92m/s)^2=2.7x106J$$

stormfire1 · Answer

ugh...that should be 2.7x10^6J.  Ok, it's 4:30am...my brain is dying.

lalaly · Answer

hehe:D

anonymous · Answer

ure such a good helper...go get some sleep :p

lalaly · Answer

yeah @stormfire1 is awesome:)