If the atomic number of an element is 8 and its mass number is 20, how many neutrons are in the atom's nucleus?

What is the momentum of a 2300 truck miving at a velocity of 35 meters/second?

A jet plane leaves the stratosphere and returns to the ground. How does the temperature outside the jet change during its descent through the troposphere? A. It decreases and then increases. B. It decreases steadily. C. It increases steadily. D.

You serve a volleyball with mass of 2.1kg. The call leaves your hand at 30m/s. The ball has Energy calculate it

Secondary waves cannot travel through

What is the name of type of relationship that exists between wavelength and frequency?

Microwave ovens emit microwave energy with a wavelength of 12.3 cm. What is the energy of exactly one photon of this microwave radiation?

When light bounces off a surface, which component will be reflected more - the component that is parallel to the surface, or the component that is perpendicular to the surface, and why?

What is 18 degrees celsius in fahrenheit?

A small object moves along the x-axis with acceleration ax (t) = - (0.0320m/s3) (15.0s-t). At t = 0 the object is at x = - 14.0 m and has velocity v0x = 8.90 m/s. What is the x-coordinate of the object when t = 10.0 s?

Nitrogen and Hydrogen react to form ammonia (NH3). The reaction looks like this: Ammonia What is the ratio of nitrogen atoms to hydrogen atoms in ammonia? 1 to 2 1 to 3 2 to 1 3 to 1