The chemical reaction involved in burning wood is that endothermic or Exothermic?

1. the coastlines of continents fitting together like puzzle pieces was one of the four pieces of evidence for continental drift. true or false? 2. why was wegners theory of continental drift not accepted by the scientific community? a.

Which half reaction shows both the conservation of mass and the conservation of charge?

If the energy of a photon is 1.32 * 10¯18 j, what is its wavelength in nm? a. 1.50 * 10¯7 nm b. 150. nm c. 1.99 * 1015 nm d. 1.99 * 1024 nm e. none of these choices is correct.

What is one advantage of using primary source when doing research on an experiment

To a cyclist riding west at 20 kg/hr, the rain appears to meet him at an angle of 45° with the vertical. When he rides at 12 km/hr, the rain meets him at an angle of 19°48' with the vertical. What is the actual direction of the rain?

What is s the best description of the constructive interference of light? A. two waves have the same direction of displacement. B. two waves have displacement in opposite directions. C. a longitudinal wave meets a transverse light wave D.

1875 kg car is traveling at 22 m/s. It's momentum is?

Hot air balloon rises because a) molecules become lighter when heated b) molecules move faster and farther apart when heated c) molecules are less attracted by gravity when heated d) molecules become charged and repel each other when heated

If the diameter of the space station is 730 m, how many revolutions per minute are needed for the "artificial gravity" acceleration to be 9.80m/s2?

A person who has dissociative identity disorder: O A. cannot remember who he or she is. O B. has panic attacks when confronted. C. has two or more distinct personalities OD hears voices