Winston stands on the edge of a building's flat roof, 12 m above the ground, and throws a 147.0-g baseball straight down. the ball hits the ground at a speed of 18 m/s. what was the initial speed of the ball?

Why are some liquids more viscous than others?

Which best describes Savanna's error? The label at the top of the diagram should be "FM Radio," not "Cell Phone." The FM carrier waves should have different frequencies than the carrier waves, not different amplitudes.

What is the source of the energy released in fission and fusion reactions?

An example of mechanical energy being converted into heat energy is A) the sun. B) a generator. C) a Snickers bar. D) rubbing your hands together.

Which concept represents most encompassing aspect of our lives

how much current is in a circuit that includes a 9-volt battery and a bulb with a resistance of 3 ohms?

Which must be present in order to call study scientific

Why is dose equvialent in rem or sv used to define the Effective Dose Equivalent and the Committed Dose Equivalent?

What is the density of an unknown metal that has a mass of 158 g and a volume of 20 ml

An electron is located on the x axis at x0 = - 9.31*10-6 m. Find the magnitude and direction of the electric field at x = 9.39 * 10-6 m on the x axis due to this electron.