All of the following are possible sources of error in a scientific investigation except for
a. measuring the change in temperature incorrectly
b. manipulating the wrong variables in the experiment
c. reviewing previously published studies before the experiment
d. completing only one trial in the experiment

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

Aprojectile is launched from ground level with an initial velocity of v 0 feet per second. neglecting air resistance, its height in feet t seconds after launch is given by s equals negative 16 t squared plus v 0 t. find the time(s) that the projectile will (a) reach a height of 192 ft and (b) return to the ground when v 0equals112 feet per second. (a) find the time(s) that the projectile will reach a height of 192 ft when v 0equals112 feet per second. select the correct choice below and, if necessary, fill in the answer box to complete your choice.

Afrequency generator sends a 550 hz sound wave through both water and ice. what is the difference in wavelength between the wave produced in ice and the wave produced in water?