Why is it important to change only one experimental variable at a time in an experiment?

A squirrel sitting on the ground starts to run with an acceleration of 5.1 m/s 2. How fast is the squirrel going after 0.25 seconds? A. 20.4 m/s B. 1.28 m/s C. 0.49 m/s D. 3.1 m/s

Leady oxide is a material that? s usually composed of A. 25% free lead and 75% lead oxide. B. 10% free lead and 90% lead oxide. C. 60% free lead and 40% lead oxide. D. 50% free lead and 50% lead oxide.

A ball is thrown straight upward and returns to the thrower's hand after 1.8 s in the air. A second ball is thrown at an angle of 23◦ with the horizontal.

The following statement was made after the data were examined: "copper pots are the best pots for cooking food quickly." Which term best describes this statement?

A spinning disc rotating at 130 rev/min slows and stops 31 s later. how many revolutions did the disc make during this time?

Technician A says that all friction and steel plates in a clutch pack should be replaced during and overhaul. Technician B says that the automatic transmission fluid cooler should always be flushed when a unit is rebuilt or replaced.

Cold water (cp = 4180 J/kg·K) leading to a shower enters a thinwalled double-pipe counterflow heat exchanger at 15°C at a rate of 1.25 kg/s and is heated to 60°C by hot water (cp = 4190 J/kg·K) that enters at 100°C at a rate of 4 kg/s.

Determine the magnitude of the acceleration for the speeding up phase.

The experimenter fom the video rotates on his stool, this time holding his empty hands in his lap. You stand on a desk above him and drop a long, heavy been bag straight down so that it lands across his lap, in his hands. what happens?

Manufacturer claims its cleanser works twice as fast as any other. What tests could be performed to support this claim? Explain your reasoning.