Which of these statements is true?
a.
some molecules may contain no atoms.
b.
some elements found in nature exist as molecules.
c.
some compounds include only one type of element.
d.
some atoms are made of two or more different elements.

Aforce of 9.00 newtons acts at an angle of 19.0 to the horizontal. what is its component in the horizontal direction?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.