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Gregor Mendel never saw a gene, yet he concluded that "heritable factors" were responsible for the patterns of inheritance he observed in peas. Similarly, maps of Drosophila chromosomes, and the very idea that genes are carried on chromosomes, were conceived by observing the patterns of inheritance of linked genes, not by observing the genes directly. Is it legitimate for biologists to claim the existence of objects and processes they cannot actually see? How do scientists know whether an explanation is correct?
Steam moves into the cylinder of a steam engine at a constant pressure and does 9.650 J of work on a piston. What is the pressure of the steam
Monochromatic coherent light shines through a pair of slits. If the distance between these slits is decreased, which of the following statements are true of the resulting interference pattern? (There could be more than one correct choice.)
a solid sphere rolls up an incline plane. what is the direction of the frictional force at the point of contact. next
a uniform electrical field is established by connecting the plates of a parallel-plate capacitor to a 11v battery. the
Two planets are on a collision course, heading directly toward each other at 0.250c. A spaceship sent from one planet approaches the second at 0.750c as seen by the second planet. find the velocity of the ship relative to the first planet
A large tank with diameter D, open to the air, contains water to a height { H}. A small hole with diameter d ( {d \ll D} ) is made at the base of the tank. Ignoring any effects of viscosity, calculate the time it takes for the tank to drain completel..
A 100 ball on a 60 long string is swung in a vertical circle whose center is 200 above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 600 above the floor.What is the..
The middle C string on a piano is under a tension of 992 N. The period and wavelength of a wave on this string are 3.82 ms and 1.39 m
a golfer hits a shot to a green that is elevated 2.80 m above the point where the ball is struck. the ball leaves the
a uniform thin rod of length 0.60 m and mass 3.0 kg can rotate in a horizontal plane about a vertical axis through its
A uniform spherical shell of mass M = 13.0 kg and radius R = 0.390 m can rotate about a vertical axis on frictionless bearings (see the figure). A massless cord passes around the equator of the shell, over a pulley of rotational inertia I = 0.200 ..
A bicycle wheel has a diameter of 63.9 centimeter and a mass of 1.87 kilogram. Obtain what force must be applied by a chain passing over a 9.10 cm diameter sprocket if the wheel is to attain an acceleration of 4.48 rad/s2
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