Q: Based on Fig. P7.82, how much elastic potential
Based on Fig. P7.82, how much elastic potential energy is stored in the DNA when it is stretched 50 nm? (a) 2.5 × 10-19 J; (b) 1.2 × 10-19 J; (c) 5.0 × 10-12 J...
See AnswerQ: The stage moves at a constant speed while stretching the DNA.
The stage moves at a constant speed while stretching the DNA. Which of the graphs in Fig. P7.84 best represents the power supplied to the stage versus time? Fig. P7.84:
See AnswerQ: The eel is observed to spin at 14 spins per second clockwise
The eel is observed to spin at 14 spins per second clockwise, and 10 seconds later it is observed to spin at 8 spins per second counterclockwise. What is the magnitude of the eel’s average angular acc...
See AnswerQ: The eel has a certain amount of rotational kinetic energy when spinning
The eel has a certain amount of rotational kinetic energy when spinning at 14 spins per second. If it swam in a straight line instead, about how fast would the eel have to swim to have the same amount...
See AnswerQ: A new species of eel is found to have the same mass
A new species of eel is found to have the same mass but one-quarter the length and twice the diameter of the American eel. How does its moment of inertia for spinning around its long axis compare to t...
See AnswerQ: The fish shoots the drop of water at an insect that hovers
The fish shoots the drop of water at an insect that hovers on the water’s surface, so just before colliding with the insect, the drop is still moving at the speed it had when it left the fish’s mouth....
See AnswerQ: A 2.50-kg mass is pushed against a horizontal
A 2.50-kg mass is pushed against a horizontal spring of force constant 25.0 N/cm on a frictionless air table. The spring is attached to the tabletop, and the mass is not attached to the spring in any...
See AnswerQ: During the calibration process, the cantilever is observed to deflect by
During the calibration process, the cantilever is observed to deflect by 0.10 nm when a force of 3.0 pN is applied to it. What deflection of the cantilever would correspond to a force of 6.0 pN? (a) 0...
See AnswerQ: A 0.300-kg potato is tied to a string
A 0.300-kg potato is tied to a string with length 2.50 m, and the other end of the string is tied to a rigid support. The potato is held straight out horizontally from the point of support, with the s...
See AnswerQ: A 60.0-kg skier starts from rest at the
A 60.0-kg skier starts from rest at the top of a ski slope 65.0 m high. (a) If friction forces do -10.5 kJ of work on her as she descends, how fast is she going at the bottom of the slope? (b) Now mov...
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