What are positive effects of plastics?

Which has more mass: a dollar bill or a quarter? Why?

A gasoline engine transforms approximately 34 percent of the fuel's chemical energy into mechanical energy. If energy is conserved, what happens to the other 66 percent? A) Most is transformed into thermal energy.

A helium balloon has an internal pressure of 2.5 atm when it occupies 4.5 L. If it was compressed until it had a pressure of 3.3 atm, what would be the final volume? Report your answer with the correct number of significant figures.

A person holds a book at rest a few feet above a table. The person then lowers the book at a slow constant speed and places it on the table. Which of the following accurately describes the change in the mechanical energy of the earth-book system? A.

Make a list of possible consequenes of solar flares to the following members of your community

Why are some craters on the moon bigger than others

What object oriented feature can we use to have a single test program, with one set of method calls in which the user can decide which bag implementation (array - or link-based) needs testing?

What might motivate someone to study forensics

A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to five times her weight as she goes through the dip. If r = 17.

A mass spectrometer accelerates doubly ionized atoms of charge 2e over a potential difference V before they enter a uniform magnetic field B which is perpendicular to the direction of motion of the ions.