1. A turtle and a rabbit to have a raceThe average speed 1s 0.9 m/s, . The rabbit's average speed is 9 m/s . The distance from the starting line to the finish line is 1500 m. The rabbit decides to the turtle run before he starts running to give the tunic head approximately, is the maximum time the rabbit can wait before starting to run and still win the

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

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C. the electric current passes from the slip rings, through the brushes, and to the collection device.

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)