Comparing pitch of sounds
order the sounds made by these sources from highest
to lowest pitch
telephone, piano, motorcycle, lawn mower
lawn mower, motorcycle, piano, telephone
motorcycle, telephone, piano, lawn mower
lawn mower, piano, telephone, motorcycle
125 250 500 1,000 2,000 4,000 8,000
frequency (hz)

When an object is heated it contracts. a. true b. false

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer