Physics, 11.02.2020 23:29 joannegrace37
In England, dogs with large, floppy ears called hounds came into existence. These dogs were favored for hunting because of their excellent sense of smell. Which statement most accurately represents the process that produced such dog breeds from the wild-type (feral) dog?A. Natural selection directed the gene mutations and reproductive success of these breeds. B. Humans noticed dogs with large, floppy ears and a great sense of smell and wanted more like them. They then bred them with similar dogs over many generations. C. Gene mutations in dogs arose spontaneously so that hounds replaced the feral dogs in the wild. D. Natural selection has resulted in the evolution of the wild-type dog into several separate species including the hounds.
Answers: 2
Physics, 21.06.2019 18:50, NycLife
How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.
Answers: 1
Physics, 21.06.2019 23:30, mmaglaya1
Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.
Answers: 1
Physics, 22.06.2019 10:00, pantojaiv90
A2k pendulum has a speed of 1 m/s at a height of 1/2 meter
Answers: 3
Physics, 22.06.2019 10:40, rainbowboi
As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.
Answers: 1
In England, dogs with large, floppy ears called hounds came into existence. These dogs were favored...
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