krash91
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Hey guys, I'd love some help with these problems, its seems to me that there aren't enough variables.
A .145kg baseball leaves a pitcher's hand at a speed of 35 m/s. If air drag is negligible, how much work has the pitcher done on the ball by throwing it?
W=FD
W=(MA)(VT)
Seems like I can't solve it without the time it was in the air.
And this one as well
Find the force needed for friction in the tires of a 2000lb car to stop it in 100ft
W=FD?
Again, it seems like there aren't enough varibles. If I had the velocity of the car then it would make sense.
Some hints and nudges in the right direction would be great!
Homework Statement
A .145kg baseball leaves a pitcher's hand at a speed of 35 m/s. If air drag is negligible, how much work has the pitcher done on the ball by throwing it?
Homework Equations
W=FD
The Attempt at a Solution
W=(MA)(VT)
Seems like I can't solve it without the time it was in the air.
And this one as well
Homework Statement
Find the force needed for friction in the tires of a 2000lb car to stop it in 100ft
Homework Equations
W=FD?
The Attempt at a Solution
Again, it seems like there aren't enough varibles. If I had the velocity of the car then it would make sense.
Some hints and nudges in the right direction would be great!
