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Biological muscle cells can be thought of as nanometres that utilize the chemical energy of ATP to produce mechanical work. Measurements show that the active proteins within a muscle cell (such as myosin and act in) can produce a force of about 7.5 pN and displacements of 8.0 nm. How much work is done by suchproteins?
Two 4.9 cm× 4.9 cm metal plates are separated by a 0.19-mm-thick piece of Teflon. What is the maximum potential difference between the disks
A beam of particles is directed at a 0.021-kg tumor. There are 2.3 x 1010 particles per second reaching the tumor, Find the biologically equivalent dose given to the tumor in 12 s
a block is made of an unknown material. when placed in water the block floats and 4 m3 of the block is observed to be
A flight attendant pulls her 64 N flight bag a distance of 370 m along a level airport floor at a constant velocity. The force she exerts is 45 N at an angle of 51° above the horizontal.
The vibrational spectrum of the H2 molecule has lines separated in frequency by 1.3x1014 Hz. determine the maximum length of the bond
A spring is standing upright on a table with its bottom end fastened to the table. A block is dropped from a height 4.4 cmabove the top of the spring. The block sticks to the top end of thespring and then oscillates with an amplitude of 13 cm.
vector a is directed along the positive y-axis and has magnitude 5.0 units. vector b is directed along the negative
The neutrons in a neutron star (Chapter 44 in the textbook) can be treated as a Fermi gas by neutrons in place of the electrons in our model of an electron gas.
Brain injuries generally occur any time the brain's acceleration reaches 100 g for even a short time, Consider a car running into a solid barrier
a person is standing 2.25 meters from a shining buidling holding a balloon which is floating 2.55 meters directly above
A Ferris wheel has radius 5.0 m and makes one revolution in 8.0 seconds. A person weighing 670N is sitting on one of the benches attached at the rim of the wheel. What is the apparent weight (normal force exerted on her with the bench) of the person ..
a small dog sits 3.0 m in front of a plane mirror. where is the dog's image in relation to the mirror
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