How long does it take for changed in an ecosystem to be reversed

4. Two ships leave port at the same time. One sails south at 15 mi/h, and the other sails east at 20 mi/h. Find a function that models the distance, D, between the ships in terms of the time, t (in hours), elapsed since their departure.

Which of the following has the greatest density? A 10 g object with a volume of 10 cubic centimeter. A 40 g object with a volume of 20 cubic centimeter. A 20 g object with a volume of 5 cubic centimeter.

How much heat is absorbed by a 47g iron skillet when its temperature rises from 12oC to 20oC?

Explain why the invention of the microscope led to the discovery of cells.

Which of the following are clues that a chemical reaction may have taken place? A. Temperature remains constant B. Release of heat C. Formation of a solid D. Mass increase

Do you think Pluto should be considered a planet? Why or why not?

An object starts from rest at time t = 0.00 s and moves in the + x direction with constant acceleration. The object travels 14.0 m from time t = 1.00 s to time t = 2.00 s. What is the acceleration of the object? a) 5.20 m/s^2 b) 10.4 m/s^2 c) 8.

A box is dragged without acceleration in a straight-line path across a level surface by a force of 13 N. What is the frictional force between the box and the surface?

What is a wormhole, and how is it formed?

Most cells cannot harness heat to perform work because