How many neutrons does element X have if it's atomic number is 21 and it's mass number is 75

A 4 kg bird has 18 joules of kinetic energy and is rolling 3 m/s. find the mass?

What most likely caused geologists to accept Alfred Wegener's theory? A. After 50 years, the theory became popular. B. All hypotheses become theories after a long period of time. C. It took scientists a long time to understand Wegener's ideas. D.

How does time affect soil

In how many ways does earth move simultaneously within our solar system? A.) 1 B.) 2 C.) 3 D.) 4

As the width of an opening in a barrier increases, how will the amount of diffraction of the planar waves change as they pass through the opening? A. It will increase. B. It will decrease. C. It will remain the same.

The divisions of time in the Geologic Time Scale represent: a) the Law of Superposition b) the results of radiometric dating c) major changes in biodiversity d) multiples of 35 million years e) all of the above

You are in a canyon and yell across. It takes 4 seconds for the echo to come back to you. How wide is the canyon?

Question 26 Unsaved What happens when you compress a gas? Question 26 options: The density increases The volume increases The pressure decreases Depends on the gas The temperature decreases

What force keeps a water spider on the surface of water

An object with a mass of 78 kilograms is lifted through a height of 6 meters. How much work is done? A. 47.75 J B. 4,586.4 J C. 468 J D. 764.4 J