a bird flying horizontally accidently at 4.25m/s accidentally drops a rock it was carrying. A short time later, the rocks velocity is 13.0m/s at - 70.9. How much time has passed? (unit s)

Approximately what percentage of Earth's radius is represented by the crust?

Select the correct answer. Which type of current is produced by a wire breaking magnetic field lines and changing the polarity? A. alternating B. direct C. straight D. alternating and direct

What do the four terrestrial planets and the four gas giant planets have in common? a. they all revolve about the sun in the same direction. b. they are all the same size. c. they all have identical orbital shapes. d.

Why might the 1990 earthquake and volcanic eruption in Luzon be related? A) Both earthquakes and volcanic eruptions are caused by plate tectonics and can occur in patterns. B) Earthquakes occur in San Francisco but not in Chicago.

A gas cylinder at a pressure of 4408 torr contains a mixture of N2, O2, and helium gases. If the partial pressure of N2 gas is 1520 torr and the partial pressure of helium is 25 torr, what is the partial pressure of O2?

Water is a compound. O A. True B. False

How do air quality scientists ensure the air is cleaned? What steps do they take?

Is a mirrors surface opaque or transparent or translucent?

Sound waves can combine to become bigger or smaller true or false

Archimedes supposedly was asked to determine whether a crown made for the king consisted of pure gold (density of gold is 19.3 * 103 kg/m3). According to legend, he solved this problem by weighing the crown first in air and then in water.