Two chemicals are combined in a beaker and react. What data would provide the best evidence for determining if the reaction absorbed or released thermal
energy?

The density of a substance is 4.0 g/cm3. if a sample of the substance has a volume of 25 cm3 then what is the mass

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.

Current from a charged capacitor lights a bulb. as time goes on the brightness of the