Archery An arrow is shot at 30.0° above the horizontal. Its velocity is 49 m/s, and it hits the target.
a. What is the maximum height the arrow
will attain?
b. The target is at the height from which the arrow was
shot. How far away is it?

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

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

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.