Spiral galaxies have a central core from which curved arms spiral outward.

true or false

Consider the incomplete chemical equation, CO2 (g) + H2O (l) →? Assuming the reactants are balanced and we start with 5 carbon dioxide molecules and 10 water molecules, how many oxygen atoms would you expect to find in the products?

A block of copper (c = 390 J/kg°C) is heated from 20.0 C to 60.0 C. How much heat (in J) is absorbed by the copper if its mass is 45.0 g?

A boy finds an abandoned mine shaft in the woods, and wants to know how deep the hole is. He drops in a stone, and counts 4 seconds before he hears the "plunk" of the stone hitting the bottom of the shaft.

Why is the heating element placed near the bottom of the kettle

A boy throws a ball vertically up and catches it after 3 s. What height did the ball reach?

What is the purpose of a valve?

A particle travels 15 times around a 10-cm radius circle in 42 seconds. what is the average speed (in m/s) of the particle?

Where are the magnetic fields stronger near a bar magnet? A) Top B) Center C) Ends D) Bottom

You pull a simple pendulum of length 0.225m to the side through an angle of 3.50∘ and release it. Part A How much time does it take the pendulum bob to reach its highest speed? Take free fall acceleration to be 9.80 m/s^2.

What is the velocity of a wave having a frequency of 25 Hz and a wavelength of 10m