What's the difference between a physical and chemical change and how do you know which is happened?

If it takes 42 minutes to load 3 1/2 trucks, how many minutes will it take to load 6 1/2 trucks?

How do humans perceive color? A. The optic nerve acts like a prism and separates white light into colors. B. Photoreceptors on the retina detect different wavelengths of light. C.

When the periodic table are the nonmetals located where are the mettalloids?

A circuit maintains a constant resistance. If the current in the circuit is doubled, what is the effect on the power dissipated by the circuit?

Evidence from sources used in research a. should be easy for the researcher to understand. b. should be credited by citing the source. c. should always be enclosed in quotation marks. d. should be short so as not to distract the reader.

if light travels in a vacuum at 3.00 x 10^8m/s and its frequency is 7.44 x 10^7 what is its wavelength

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass