Atop a cliff, a rock is thrown vertically upward and reaches maximum altitude in 1.59 sec. Later the rock reaches a speed of 23.4 m/s just before hitting the ground at the base of the cliff. How high is the cliff in meters? Express algebraic solution in terms of tm, vf, and g.

Alexander calder's mobiles are an example of motion because it uses forces of wind and water.

Explain to someone who knows nothing about fossils the study of invertebrate paleontology and how it scientists understand the history of the earth. be sure your explanation contains a minimum of two complete sentences.

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.