Which elements do hydrogen fuel cells combine to produce electricity?

How much energy is needed to increase the temperature of 755 g of iron from 283 K to 403 K?

Suppose a cylindrical habitat in space 6.80 km in diameter and 24 km long has been proposed. Such a habitat would have cities, land, and lakes on the inside surface and air and clouds in the center.

A tuning fork produces a sound wave on air with a frequency of 261.6 hz. at room temperature the speed of sound is 343m/s. what is the wave length

The scientist who incorrectly theorized that it was the positive charge that moved through a circuit was ...

Which of the following statements about tornadoes is false? Most tornadoes form during the afternoon Most tornadoes have funnels taller than 105 meters (344 feet) Most tornadoes form during the spring in summer months Most tornadoes have wind speeds

Why is mass movement more common after a heavy rainfall?

Order the colors of the rainbow starting with the color that is bent the least to the color that is bent the most (when it passes through a prism). Question 1 options: yellow blue indigo orange green red violet

Find the unit vector that has the same direction as the vector v = _12j

Why isn't the size of something considered a physical property?

A hunter is standing on flat ground between two vertical cliffs that are directly opposite one another. He is closer to one cliff than the other. He fires a gun and, after a while, hears three echoes. The second echo arrives 1.