A 52.0-kilogram skateboarder does a trick on a half-pipe. During the trick, he reaches a speed of 8.90 m/s. The radius of the half-pipe ramp is 3.00 meters. What is the minimum centripetal force necessary to keep the skater on the ramp?

Strictly speaking, as more and more skyscrapers are built on the surface of the Earth, does the day tend to become longer or shorter? And strictly speaking, does the falling of autumn leaves tend to lengthen or shorten the 24-hour day?

A bag is dropped from a hovering helicopter. The bag has fallen for 2.0 s. What is the bag's velocity? How far has the bag fallen?

Gravity on the moon is about 1/6 th the gravity felt on the earth. This is because A) the moon is so far away from the earth. B) the moon is much less massive than the earth. C) the earth has a molten core and the moon doesn't.

List four ways of separate a mixture

Which of these may be damaged by increase in solar activity

Why do atoms like carbon and nitrogen not like to make ions, while sodium and chlorine do?

Which of the following is the kinetic rate equation for the addition-elimination mechanism of nucleophilic aromatic substitution? rate = k[aryl halide] rate = k[nucleophile] rate = k[aryl halide][nucleophile] rate = k[aryl halide][nucleophile]2

What idea is the kinetic molecular theory based on?

What happens when ionic bonds are formed? Metal atoms lose electrons, and nonmetal atoms gain electrons. Metal and nonmetal atoms both lose electrons. Metal atoms gain electrons, and nonmetal atoms lose electrons.

Explain what centimeters, kilometers, and millimeters are.