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Unformatted text preview: Extra Example Problems for Ch. 5, Doug Smith True or False: 1. Energy is a "vector", meaning it has a magnitude (size) and direction. FALSE. 2. ATP hydrolysis releases stored chemical energy. TRUE 3. When energy changes from one form to another forms some energy is inevitably lost because the conversion is never 100% efficient. FALSE - total energy is 100% conserved 4. The total force on a barbell can be zero and the barbell can be moving upwards TRUE. F=ma=0 implies a=dv/dt=0 implies v=constant. 5. When you push on a spring and compress it, energy is stored in your hand TRUE (see explanation on lecture slides) 6. Suppose a force F=sin(x), where x=position, is applied to move an object from position x=0 to x=1 meter. What is the work energy? ∫ = =--- = = 1 )) cos( ( )) 1 cos( ( ) sin( x dx x W (-0.54) - (-1) =0.46 7. Suppose a dynamite explosion sends two shards of metal flying: one with mass 1 g and velocity 10 m/s at an angle of 45 degrees and one with mass 2 g and velocity 5 m/s at an angle of -135 degrees. If all of at an angle of 45 degrees and one with mass 2 g and velocity 5 m/s at an angle of -135 degrees....
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This note was uploaded on 04/04/2010 for the course PHYS 1A PHYS 1A taught by Professor Smith during the Fall '10 term at UCSD.
- Fall '10