Explain why the y-component of acceleration is constant for an object in projectile motion. a. the y -component of acceleration increases, and it changes as the velocity changes. b. the x-component of acceleration increases, and it changes as the velocity changes. c. the y- component of acceleration is gravity, and it is always - 9.81 m/s ^ 2 d. the y-component of acceleration decreases , and it changes as the velocity changes

What does si stand for,when referring to a system of measurement

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?