A theory is a hypothesis that has been shown to be correct by many experiments.
a. true
b. false
Answer: b. false
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How does the wavelength (in a vacuum) of a high-frequency electromagnetic wave compare with a low-frequency electromagnetic wave?
A) it is impossible to tell because frequency and wavelength are not related B) the lower-frequency wave has the longer wavelength because frequency and wavelength are inversely proportional to each other C) the two waves have the same wavelength because the wavelengths of all electromagnetic waves are the same D) the higher-frequency wave has the longer wavelength because frequency and wavelength are directly proportional to each other
To get to her physics class, Alice walks 0.25 mi to the bus stop. She takes the bus 1.2 mi to the train station. She takes the train 13 mi and walks the remaining 0.17 mi to her class
How far is her commute expressed to the correct number of significant figures? A) 14.6 mi B) 10 mi C) 15 mi D) 14.62 mi E) 14.620 mi
How tall must a plane mirror be in order for you to be able to see your full image in it?
A) the same height as you B) 1/4 of your height C) half of your height D) 3/4 of your height E) twice your height
A piece of taffy slams into and sticks to an identical piece of taffy at rest. The momentum of the combined pieces after the collision is the same as before the collision, but this is not true of the kinetic energy, which partly degrades into heat
What percentage of the kinetic energy becomes heat? A) 0% B) 25% C) 50% D) 75% E) need more information