Which of the following is an is sample of an experimental scientific investigation
a. recording sound of a glass breaking.
b. placing test tubes in an ice bath for 15 minutes.
c. noting the ph of a solution on a digital meter.
d. noting the color of a solution when heated.

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j

The process of predicting values that extend beyond the range of data points is called absolute value extrapolation interpolation prediction for any given: )

Abeam of light shining from water to air strikes the surface at an angle greater than 48 degrees and produces total internal reflection. if the incident beam is at a 50 degree angle what angle is the reflected beam 13 25 50 100