The hard external covering of some invertebrates is called a what

The reaction equation below shows the formation of aluminum oxide. Which set of coefficient balances the equation? Al+O2? Al2O3 A) 1,1,1 B) 2,3,5 C) 2,4,5 D) 4,3,2

If you double the velocity of a moving object, how is it's momentum affected?

A freight train is accelerating on a level track. The tension in the coupling between the engine and the first freight car would change if some of the cargo in the last car were transfered to other cars?

Climatology is a subspecialty of A. environmental science. B. meteorology. C. marine biology. D. oceanography.

A hockey puck wont slide very far on concrete or asphalt, but it will slide for a very long time on ice. Why is this?

If the north pole of a magnet in a compass is attracted to Earth's geographic north, what must be the polarity of Earth's magnetic north pole? A. north B. south C. It can't be determined from the information given.

A canoe started its trip at 8 am. If the cannoe travelled at a speed of 70 mph how far did it travel by 1:36 pm?

1. Tariff of 1828 John C. Fremont 2. abolitionist who led the raid on Harper's Ferry John Brown 3. published The Liberator Santa Anna 4. Underground Railroad Harriet Tubman 5. died at the Alamo William Lloyd Garrison 6.

Which interaction of nature is weakest? a. strong c. electromagnetic b. weak d. gravitational

Two workers pull horizontally on a heavy box but one pulls twice as hard as the other. The larger pull is directed at 25.0 west of north and the resultant of these pulls is 430.0N directly northward.